CA1181167A - Editing system for audio signals - Google Patents
Editing system for audio signalsInfo
- Publication number
- CA1181167A CA1181167A CA000394452A CA394452A CA1181167A CA 1181167 A CA1181167 A CA 1181167A CA 000394452 A CA000394452 A CA 000394452A CA 394452 A CA394452 A CA 394452A CA 1181167 A CA1181167 A CA 1181167A
- Authority
- CA
- Canada
- Prior art keywords
- signal
- audio signals
- tape
- editing system
- audio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- 230000005291 magnetic effect Effects 0.000 claims description 26
- 230000004044 response Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims 5
- 238000012544 monitoring process Methods 0.000 claims 2
- 230000000875 corresponding effect Effects 0.000 claims 1
- 230000000994 depressogenic effect Effects 0.000 description 5
- XLNZEKHULJKQBA-UHFFFAOYSA-N terbufos Chemical compound CCOP(=S)(OCC)SCSC(C)(C)C XLNZEKHULJKQBA-UHFFFAOYSA-N 0.000 description 4
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- BHMLFPOTZYRDKA-IRXDYDNUSA-N (2s)-2-[(s)-(2-iodophenoxy)-phenylmethyl]morpholine Chemical group IC1=CC=CC=C1O[C@@H](C=1C=CC=CC=1)[C@H]1OCCNC1 BHMLFPOTZYRDKA-IRXDYDNUSA-N 0.000 description 1
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
- G11B27/322—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier used signal is digitally coded
- G11B27/323—Time code signal, e.g. on a cue track as SMPTE- or EBU-time code
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/005—Programmed access in sequence to indexed parts of tracks of operating tapes, by driving or guiding the tape
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/002—Programmed access in sequence to a plurality of record carriers or indexed parts, e.g. tracks, thereof, e.g. for editing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
- G11B27/024—Electronic editing of analogue information signals, e.g. audio or video signals on tapes
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
- G11B27/029—Insert-editing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
- G11B27/13—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier the information being derived from movement of the record carrier, e.g. using tachometer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/60—Solid state media
- G11B2220/65—Solid state media wherein solid state memory is used for storing indexing information or metadata
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/90—Tape-like record carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
- G11B27/3036—Time code signal
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/34—Indicating arrangements
Abstract
ABSTRACT OF THE DISCLOSURE
An editing system for audio signals enables an erase operation for audio signals recorded longitudinally on a tape accurately. A start point for the erase operation is controlled by an address signal produced by a pulse generator mounted on a capstan for moving the tape.
An editing system for audio signals enables an erase operation for audio signals recorded longitudinally on a tape accurately. A start point for the erase operation is controlled by an address signal produced by a pulse generator mounted on a capstan for moving the tape.
Description
6~9 EDITING SYSTEM FOR AUDIO SIGNALS
BACKGROUND OF TEIE INVENTION
Field of the Invention . . .
The present invention relates generally to an editiny system for audio signals and is clirected more particularly to an editing sys-tem for audio signals which can edit and amend audio signals with finer uni-t.
Description of the Prior Art _ . . .
In a conventional editing system or editor wherein video and audio signals are edited and then recorded on a ? record medium, it is general that hour, minute and second frame signals provided corresponding to frame signals of the video signals, namely, so-called SMPTE (Society of Motion Picture and Television Engineers) time code signals are utilized as address signals. Since the SMPTE time code ~ signals are provided respectively to correspond to the frame si~nals of the video signals, they are quite effective when the video signals, which can change in only frame units, are edited. But, with respect to -the audio signals, such Si~lPTE
time code signals are unsatisfactory, but instead, the edition with finer unit is required. Whereas, in -the con-ventional editor, the edition is carried ou-t based on the SMPTE time code signal ~esponsive to the frame signal, so ~hat the edition with the unit finer than ever can not be carried out. Further, such a case will occur that an unnecessary audio signal, which was recorded previously, is left between the edited signals on the connected portion or -the like on the tape. Since the aforesaid unnecessary audio signal causes a pop noise upon piayback, i-t is necessary to partial]y erase such unnecessary ~udio ~ signal, in other words, to perEorm a so-called spot erase.
But, since it is required tha-t -the above spot erasing is generally carried out in the finer uni-t than the frame signal interval, it is qui-te difficult to perform the spot erase automatically.
OBJ~CTS AND SUM~I~RY OF TIIE INVENTION
Accordingly, it is an object of the present invention to provide an editing system for audio signals in which the audio signals are edited and recorded on a record medium and which can edit and amend -the audio signals in ~iner unit.
It is another object of the present invention to provide an editing system for auclio signals in which the audio signals are edited and recorded on a record medium and which can perform a spot erase easily.
According to an aspect of the present invention, there is provided an editing system for audio signals enables an erase operation for audio signals recorded longi-tudinally on a tape accurately A star-t point for the erase opera-tion
BACKGROUND OF TEIE INVENTION
Field of the Invention . . .
The present invention relates generally to an editiny system for audio signals and is clirected more particularly to an editing sys-tem for audio signals which can edit and amend audio signals with finer uni-t.
Description of the Prior Art _ . . .
In a conventional editing system or editor wherein video and audio signals are edited and then recorded on a ? record medium, it is general that hour, minute and second frame signals provided corresponding to frame signals of the video signals, namely, so-called SMPTE (Society of Motion Picture and Television Engineers) time code signals are utilized as address signals. Since the SMPTE time code ~ signals are provided respectively to correspond to the frame si~nals of the video signals, they are quite effective when the video signals, which can change in only frame units, are edited. But, with respect to -the audio signals, such Si~lPTE
time code signals are unsatisfactory, but instead, the edition with finer unit is required. Whereas, in -the con-ventional editor, the edition is carried ou-t based on the SMPTE time code signal ~esponsive to the frame signal, so ~hat the edition with the unit finer than ever can not be carried out. Further, such a case will occur that an unnecessary audio signal, which was recorded previously, is left between the edited signals on the connected portion or -the like on the tape. Since the aforesaid unnecessary audio signal causes a pop noise upon piayback, i-t is necessary to partial]y erase such unnecessary ~udio ~ signal, in other words, to perEorm a so-called spot erase.
But, since it is required tha-t -the above spot erasing is generally carried out in the finer uni-t than the frame signal interval, it is qui-te difficult to perform the spot erase automatically.
OBJ~CTS AND SUM~I~RY OF TIIE INVENTION
Accordingly, it is an object of the present invention to provide an editing system for audio signals in which the audio signals are edited and recorded on a record medium and which can edit and amend -the audio signals in ~iner unit.
It is another object of the present invention to provide an editing system for auclio signals in which the audio signals are edited and recorded on a record medium and which can perform a spot erase easily.
According to an aspect of the present invention, there is provided an editing system for audio signals enables an erase operation for audio signals recorded longi-tudinally on a tape accurately A star-t point for the erase opera-tion
2~ is controlled by an address signal produced by a pulse genera-tor mounted on a capstan for moving the tape.
The other objects, Eeatures and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings through which the like references designate tne same elements and parts.
BRIEF DESCRIPTION OF T~E DRAWINGS
. _ Fig. 1 is a schematic diagram typically showing a recording pattern of a magnetic tape; and ~~ Fig. 2 is a block construction diagram schematically showing one embodiment of an editing system for audio siynals according to the present invention.
DESCRIPTION OF THE PREFERRED EM~ODIMENT
_ Fi~. 1 schematically shows a recording pattern in a magnetic tape 1 of a helical scan video tape recorder used in this embodiment. As illustrated in Fig. 1, reference numexals 2 each denote a video signal track, and as -two video signal tracks, the video signal of one ~rame is formed thereonO
NumPral 3 represents an address track in which as shown by numerals 3a, 3b and 3c, the address track is formed of -the 2Q SMPTE time codes, each corresponding to one frame respectively, and the time codes 3a, 3b and 3c are located respectively in response to each one frame signal of the respective video signal tracks 2. Numerals 4 denote audio signal tracks in which numeral 4a denotes an unnecessary audio signal track remaining at the connected portion between the edited audio signal tracks 4.
ALso, Fig. 2 shows the whole arrangement of an essential part of an example of the editing system for audio signals according to the present invention. As illustrated
The other objects, Eeatures and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings through which the like references designate tne same elements and parts.
BRIEF DESCRIPTION OF T~E DRAWINGS
. _ Fig. 1 is a schematic diagram typically showing a recording pattern of a magnetic tape; and ~~ Fig. 2 is a block construction diagram schematically showing one embodiment of an editing system for audio siynals according to the present invention.
DESCRIPTION OF THE PREFERRED EM~ODIMENT
_ Fi~. 1 schematically shows a recording pattern in a magnetic tape 1 of a helical scan video tape recorder used in this embodiment. As illustrated in Fig. 1, reference numexals 2 each denote a video signal track, and as -two video signal tracks, the video signal of one ~rame is formed thereonO
NumPral 3 represents an address track in which as shown by numerals 3a, 3b and 3c, the address track is formed of -the 2Q SMPTE time codes, each corresponding to one frame respectively, and the time codes 3a, 3b and 3c are located respectively in response to each one frame signal of the respective video signal tracks 2. Numerals 4 denote audio signal tracks in which numeral 4a denotes an unnecessary audio signal track remaining at the connected portion between the edited audio signal tracks 4.
ALso, Fig. 2 shows the whole arrangement of an essential part of an example of the editing system for audio signals according to the present invention. As illustrated
3~ in Fig. 2, numeral 5 designa-tes an erasing magnetic head for erasing the audio signals recorded on the audio signal tracks 4 of the magnetic tape 1. Numeral 6 desi~nates a recording magnetic head for recording the audio signals on the audio signal tracks 4. Numeral 7 deno-tes a reproducing ma~netic head provided for reproducing the audio signals Erom the audio si~nal tracks ~. Numeral 8 designatesan SMPTE time code signal reproducing mangetic head for reproducing the SMPTE time code signal from the SMPTE time code signal track 3.
The erasing head 5 is adapted to become opera-tive for the erase operation when supplied with an erase signal derived from an erase signal genera-ting circuit 9 being delivered through a connection switch 10 which is controlled by a control signal derived from an edit control circuit 18 that will be described later. Also, as shown in Fig. 2, numeral 11 represents another video tape recoder (hereinafter simply referred to as VTR), which serves a source for supplying new audio signals and so on to be newly edited.
The audio signal derived from the VTR 11 is supplied to the recording magnetic head 6 by way of a connection switch 12 to be controlled by the control signal produced from the edit control circuit 18 which will be discussed later.
The audio signal reproduced from the reproducing magnetic head 7 is supplied through a serial circuit formed of an amplifying circuit 13 and a rehearse muting circuit 1~ for the spot erasing to be controlled by the control signal derived from the edit control circuit 18, which will be described later, to a speaker 16. The audio signal produced from the VTR 11 is provided to the speaker 16 by way of an edition rehearse connection switch 17 to be controlled by the control signal derived from ~he edi-t control circui-t 18 as will be described later. The reproduced siynal from the SMPTE time code signal reproducing magnetic head 8 is supplied to a time code signal reading circuit or reader 19 and the output signal of this time code signal reader 19 is applied to an address display 20, so -that the location of the magnetic tape 1 at present is displayed by the SMPTE
time code signal. l`he time code signal produced in the output side of the time code signal reader 19 is supplied through one connection switch 21a in an in-point deciding switch 21 to an address memory 22 and in addition, the aforesaid time code signal is applied through one connection switch 23a in an out-point deciding switch 23 to the address memory 22 and this time code signal is further supplied to the edit control circuit 18 as the comparing signal.
Numeral 24 designa-tes a capstan shaft whose rotation transports the magnetic tape 1. This capstan shaft 24 is constructed the same as that of a normal VTR, -the rotation of which is controlled by a capstan motor 25.
In this embodiment of the present invention, -the capstan shaft 24 is provided with a frequency generator 26.
The frequency generator 26 is so formed as to generate pulse signals of prede~ermined number, for example, 14 pulse signals having equal interval each ~etween the frame signals when the magnetic tape 1 is transported at a constant speed, in other words, the capstan shaft 24 is rotated at the constant speed. In this case, when the time code signal is produced from the magnetic tape 1 which is transported by the capstan shaft 24, the number of the pulse signals which the frequency generator 26 generates between the frame signals in the time code signal always becomes the predetermined number, for example, 14 irrespective of~-the rotation speed of tile capstan shaft 24. I'he ou-tput pulse signal from the fre~uency genera-tor 26 is ~upplied -to a coun-ter 27 as a count signal. The co~lnter 27 is formed of an up-clown coun-ter which decides to count i-t up or down when a t~pe transporting direction signal is delivered from the time code signal reader 19 thereto. Instead of the tape transporting direction signal, it is possible that the counter 27 may be supplied with a signal derived from a tape speed controller which will be described la-ter.
Also, nuneral 27R denotes a reset signal input terminal through which the frame signal produced from the time code signal in the magnetic tape l is supplied to the counter 27. The aforesaid counter 27 is reset by the frame signal which will be supplied to the reset signal inpu-t terminal 27R. Accordingly, the counter 27 is adapted to count the output pulse signal between the frame signals in the repro-duced time code signal from the Erequency genera-tor 2~
irrespective of the tape transporting direction and the tape speed. The count signal produced on the output side of the counter 27 is supplied through ano-ther connection switch 21b of the in-point decidiny switch 21 -to the address memory 22 and the count signal is also supplied to the address memory 22 ~-ia another connection switch 23b of the out-point decidiny switch 23. In addi-tion, this count signal is applied as the comparing signal to the edit control circuit lR. In this case, it is arranged that the connection switches 21a and ~lb of the in-point deciding switch 21 are simultaneously made QN and OFF. The time code signal and the count signal in -time a-t which the connection switches 21a and 21b are made ON are memorized a-t thé address memory 22 as an edition start -time information signal which will be applied to the edit control circuit 18. Also, the connection switches 23a and 23b in the out-point deciding switch 23 are so arranged that they are respec-tively made ON and OFF simultaneously. The time code signal and the count signal in time at which the connection switches 23a and 23b are made ON are supplied to and memorized in the address memory 22 as an edition end time information signal.
The edition end time information signal th~s stored at the address memory 22 is delivered to the edi-t control circuit 18. Numeral 28 designates an address trim circuit and this address trim circui-t 28 includes an arithme-tic func-tion to supply an address trim signal to the address memory 22 in accordance with operations of a keyboard 29 thereby allowing the edition start-and-end time information signals to be trimmed or corrected. The keyboard 29 is provided wi-th ten keys and keys of "IN" "O~T", "+'and "-". The outputs therefrom are supplied to the address -trim circuit 28.
When the address in the in-poin-t is intended to be trimmed, "IN" key on the keyboard 29 is depressed and if necessary, "+" or "-" key and a numerical key or keys on the ten keys is depressed in response to the desired amount of the trimming, so that the address trim circuit ~8 calculates to change the in-point address which is stored in the address memory 22. In this case, since the trimming using the ten keys is carried out in the unit respon~sive to the input pulse of the counter 27, if the trimming is performed 3~ together with the confirmation by the rehearse operation as described later, it is possible to decide -the accurate edit point oE ~he address.
Numeral 30R represen~s an audio rehearse but-ton, 30E an audio edit button, 31R a spot erase rehearse bu-tton and 31E represents a spot erase bu-tton and signals respec-tively produced therefrom are delivered -to the edi-t control circuit 18. When the audio rehearse button 30R, the audio edit button 30E, the spot erase rehearse button 31R and the spot erase button 31E are respectively operated, the edit control circuit 18 is acti~ated by using a computer incorporated therein to control the audio rehearse operation, the audio edit operation, the spot erase rehearse operation and the spot erase operation respectively. Numeral 15 denotes a tape speed controller which secures within it a potentiometer to be adjusted by a ro-tation of a knob 15a.
The output therefrom is delivered to -the edit control circuit 18, by which the rotation direction and the speed of the capstan motor 25 or a capstan motor (-though no-t shown) of the VTR 11 are controlled. When the knob 15a in the tape speed controller 15 stays at the center thereof, -the capstan motor 25 is stopped. When it is turned in the clockwise direction, the capstan motor 25 is rotated in the normal direction and the rotation speed thereof is increased in accordance with the rotation angle. In case of counter-clockwise direction, although the capstan motor 25 is rotated in a reverse direction thereto, the rotation speed thereof is likewise increased in response to the rotation angle.
In the figure, such a case is illustrated that the rotation speed can be controlled in a range from + two ~0 multiple speed (as compared with the normal play speed) to -~$
two multiple sp~ecl. In this case, while there are providecl various kin~s oE the function keys on the keyboard 29 usecl for the ordinary edition of the video signal to con-trol the edit control circuit 1~, these func-tion keys are not shown in the Eigure because they are not particularly indispensable ~or the ecli-ting system for audio sigllals in the embodiment according to the present invention.
The description of the edit control circuit 1 will proceed further in detail.
A description will first be given to a case where the unnecessary recording audio signal track 4a as seen in Fig. 1 is erased, more specifically, the so-called spo-t-erase is performed.
Since the track 4a is short in length, it is qui-te dif~icult to decide the position of the track ~la if the -tape 1 is transported at the norMal speed. Therefore, the knob 15a in the tape speed controller 15 must be adjus-ted in order that the rotation speed of the capstan motor 25 may become slower than the normal speed. While the reproduced signal ~0 reproduced by the magnetic head 7 in the low speed mode mentioned above is monitored through the speaker 16, the start point of the track 4a is searched and then the tape 1 is stopped. When the track 4a or its s-tart point is not searched once by the afore-said me~hod, the start point of the track 4a can be searched in a manner that the tape 1 is transported in the normal and reverse directions before and after the start point. After the tape 1 is s-topped at the start point of the tracX 4a, keeping this state of the tape 1~ the in-point deciding switch ~1 is operated to supply the SMPT~ time code signal produced at the ou-tput side of the time co~e si~nal reader 19 an~ the count signal produced at the output side of the counter 27 at -that time to the address memory 22 thereby memorized therein as the erase start time information signal.
Next, by the same operation, the tape 1 is stopped at the end point of the trac]i 4a and the o~t-point deciding switch 23 is activated to supply the S~IPTE time code si~nal produced a-t the output side of the time code si~nal reader 13 and the count signal produced at the output side of the counter 27 at that time to the address memory 22 so as to be memorized therein as the erase end time information signal.
With respect to the opera-tions of the in-point deciding switch 21 and the out-point deciding switch 23, such a method may also be possible -that these switches 21 and 23 are operated while the tape 1 is transported and the values of the tirne code signal reader 19 and the counter 27, which will be produced at the instant the switch buttons are depressed, are stored in the address memory 22. But, in this case, because there exists a reaction delay until an operator depresses the switch button in practice since the operator heard the sound, a so-cailed reaction trim is needed.
The above trim is performed in a manner as follows. ~fter the "IN" or "OUT" and "+" or "-" buttons on the keyboard 29 are operated, numerals responsive to the reaction delay time oE the operator are inputted by the ten keys whereby the address of the memory 22 can be trimmed or corrected by the address trim circuit 28.
In this way, the start and end points of the unnecessary track 4a are decided. However, if the erase operation is carried out by the arrangement as set forth above, there is a possibility -tha-t othek par-ts excluding the unnecessary track ~a will be erased and hence it is recommended that the rehearse operation is performed to con:Eirm the above possibility as follows.
When the spo-t erase rehearse button 31R is depressed, the edit control circuit 18 sequentially carries out the following commands. First, the magnetic tape 1 is rewound from the in-point address previousl~ decided to the posi-tion with the predetermined length, namely, a so-called preroll is carried out. Arter the preroll, the tape 1 is transported at the normal speed and at the same time, -the audio signal is reproduced. In this state, the ed.it control circui-t 18 compares the SMPTE time code signal produced in the output side of the time code reader 19 and derived from the magnetic tape 1 and the count signal produced in the ou-tput side of the counter 27 with the erase start time information signal stored in the address memory 22. When these signals are ~ coincided with each other, the edit control circuit 18 produces a muting control signal at i-ts muting con-trol signal output terminal 18d and then delivers it.to th~ muting circuit 14, which is why the audio signal to be applied to the speaker 16 is muted. Next, the edit con-trol circui-t 18 compares the SMPTE time code signal derived from the time code signal reader 19 and the count signal from tne counter 27 with the erase end time information signal memorized in the address memory 22. When these signals are made coinciden-t with each other, the edit control circuit 18 loses the muting control signal at the muting control signal output terminal 18d, so that the muting operation of the mu-ting circuit 14 is released to allow the audio signal to be supplied to the speaker 16. In other words, accordlng to the spot erase rehearse operation, i-t is possible to mute the sound a-t the part which is intended to be erased.
If it becomes clear through the rehearse operation as mentionecl above that the in-point and/or out-point is unsuitable, the keyboard 29 is operated in -the manner same as the afore-mentioned reaction trim to change the addresses thereof, thus permitting the rehearse operation to be performed again. When the portion which is intended to be erased is determined as sa-tisfactory by the spot erase rehearse opera-tion, it is sufficient that the spot erase button 31E is operated and in this case, the edit control circuit 18 operates same as described above. But, since there are some differences on such dis-tances as _ between the reproducing head 7 and the recording head 6 and ~ be-tween the recording head 6 and the erase head 5 as seen in Fig. 2, upon erasing, the erase operation is performed in a timing at which such differences are corrected. The difference among the erase start time information signal derived from the address recording apparatus or address memory 22, the :~ SMPTE time code signal from the time code signal reader 19 and the count signal derived from the counter 27 becomes equal to the aforesaid distance ~ + m, the erase control signal is generated from the erase control signal output terminal 18a, so that the connection switch 10 is closed by the erase control si~nal to supply the erase signal derived from the erase signal generator or generating circuit 9 to the erase head 5 so as to make the erase head ~0 5 in the erasing mode. This erasing mode of the erase head 5 lasts until -the dif~erencc among thc er~se en(l -time information signal stored in the address memory 22, the SMPTE time code signal read out from the -time code signal reader 19 and the count signal derived from the coun-ter 27 becomes equal to the aforesaid ~ n, so tllat thc spot erase operation is kept on. In this case, since the count signal derived from the counter 27 is used in addi-tion -to the SMPTE time code signal, which is the frame signal, to determine the erase start time and the erase end time, it is possible to determine the erase start time and the erase end time of the erase operation with finer unit and the spot erase of -the unnecessary audio signal can be carried out by the automatic operation. Therefore, such an advantage is effected that the spot erase thereto becomes easy.
A description will next be given to a case where signals are partially inserted -thereinto especially when the edition is carried out, namely, a so-called insert edit is performed.
In this case, the edit start time and the edit end time are decided in the same manner as the erase start time and the erase end time mentioned above and the edit start -and-end time ~nformation signals are memorized in the address memory 22.
Also, with respect to the VTR 11, the edit start -and-end time information signals are stored in -the address memory 22 by like operations, where this time, it is enough that only the in-point may be stored.
When the audio rehearse opera-tion is carried out for the audio signal prior to the edition, the audio signal rehearse button 30R is operated.
In -this case, the edit control circuit 18 generates like command -to the VTR 11 at -the same time -the preroll of the magne-tic tape 1, so that -the ma~net.ic -tape 1 and -the VTR 11 are started to be transported in the play modes aEter the preroll was carried ou-t. Next, the edit control circuit 18 compares the SMPTE time code signal produced in the outpu-t side of the time code signal reader 19 from -the magnetic tape 1 and the count signal produced at the output side of the counter 27 with the edit s-tart time information signal s-tored in the address memory 22.
When these signals are coincided with one other, -the muting cont.rol si~nal is produced a-t -the muting control signa:L
output terminal 18d of the edit control circuit 18 and then delivered to the muting circui-t 1~ to perform the muting operation thereof. At the same time, the edit control circuit 18 produces the audio rehearse control signal at its audio rehearse control signal output terminal 18c whereby the connection switch 17 is closed by this audio rehearse control signal to supply the audio signal derived from the VTR 11 to the speaker 16. The aforesaid state lasts from the edit start time to the edit end time. When the SMPTE
time code signal derived from the time code reader 19, the coun-t signal from the counter 27 and the edit end time information signal memorized in the address memory 22 become coincident with each other, the respective con-trol signals are lost a~ the control signal output terminals 18c and 18d, so that the connection switch 17 is made OF~ and the muting operation of the muting circuit 14 is released.
In other words, in accordance with the audio rehearse ~0 operation thus described, the reproduced signal from the reproducing head 7 is supplied to the spea~er 16 upon normal mode while the auclio signal derived from the VTR
11 which will be inserted thereinto is supplied -to the speaker 16 between the edi-t start-and-end times by which the s-tate of the tape 1 after the eclition was completed can be known from the sound -the speaker 16 reproduces.
If there still remains an inconvenience, i-t is enough tha-t the trim opera-tion is performed in -the manner same as described above. If the edited state oE the tape 1 is approved as satisfactory through this auclio rehea.rse operation, the audio edit button 30E is depressed to activate the edit control circuit 18 in the manner same as the aforesaid audio rehearse mode. Bu-t, as described above, since the respective heads 5, 6 and 7 have the distance diEferences thereamong, the switch 10 is con-trolled to be turned ON in a manner faster than the memorized address by the amount of Q + m and the switch 12 is controlled to be made ON in a manner fas-ter than the memorized address by the amount of m and the switches 10 and 12 are controlled to be made OFF in a manner faster than the memorized address by like amounts, respectively, thereby to perform the insert edit.
In this case, since the count signal derived from the counter 27 is also used in addition to the SMPTE time ~5 code signal, which is the frame signal, in order to decide the edit start-and-end times like the spot erase, it is possible to decide the aforesaid edit start-and-end times with finer unit and hence such advantage is brought about that the edition of the tape can be performed with finer unit.
While in the description men-tioned above is disclosed the insert edit, it can be easily unders-tood that the editing system Eor audio si~nals accordin~ to the present invention can also be applied to a case where tlle signal is simply connec-ted to the signal, namely, a so~called assemble edit.
As described above, in accordance with the embodiment of the present invention, the coun-t signal derived from the counter 27, in other words, -the address signal is prepared between the SMPTE time code signals, which are the frame signals, and the frame and address signals are s utilized to edit the audio signal, so that this audio signal can be edited and corrected with finer unit and therefore, the spot erase can be carried out easily. Also, according ~o the embodiment as described above! since the address signal between the frame signals is ob-tained from the frequency generator 26 provided in connection with the capstan shaft 24, it is possible to achieve tne address si~nal with a predetermined interval relative -to the ma~netic tape 1 free from the transporta-tion speed of the magne-tic tape 1. Consequen-tly, although tape 1 is transported a-t the low speed, the address of the address memory 22 is decided and there is a little influence caused by the reaction delay due to the operator, so that the address can be decided faster than that of the prior art editor.
While in the afore-described embodiment of the present invention, the frequency genera-tor 26 is provided in association with the capstan shaft 2~ to achieve the address signal be-tween the frame signals, instead of the frequency generator 26, such a variation or modification may also be possible that there is provided a so-called coun-ter roller having a rotary shaft to be rotated by -the feeding of the tape in connection wi-th which a pulse gellerator is provided.
While the afore-men-ti.oned embodiment of the present inverlt.ion describes a case where the SMPTE signal is utilized as the time code signal, it is needless to say tha-t ins-tead of the SMPTE signal, o-ther time code signal such as VITC (Video Intermedi.ate Time Code) sigllal can be used in which the time code signal is recorded during one horizontal blanking period of the video signal like the time code signal disclosed in U.S. Pa-tent No.4,159,480 issued on June 26, 1979.
The above description is given on a single preferred embodiment of the invention, but it will be apparent that many modifications and varia-tions could be effected by one skilled in the art without departinc~ from the spirits or scope of the novel concepts of the invention, so that the scope of the invention should be determined by -the appended claims only.
The erasing head 5 is adapted to become opera-tive for the erase operation when supplied with an erase signal derived from an erase signal genera-ting circuit 9 being delivered through a connection switch 10 which is controlled by a control signal derived from an edit control circuit 18 that will be described later. Also, as shown in Fig. 2, numeral 11 represents another video tape recoder (hereinafter simply referred to as VTR), which serves a source for supplying new audio signals and so on to be newly edited.
The audio signal derived from the VTR 11 is supplied to the recording magnetic head 6 by way of a connection switch 12 to be controlled by the control signal produced from the edit control circuit 18 which will be discussed later.
The audio signal reproduced from the reproducing magnetic head 7 is supplied through a serial circuit formed of an amplifying circuit 13 and a rehearse muting circuit 1~ for the spot erasing to be controlled by the control signal derived from the edit control circuit 18, which will be described later, to a speaker 16. The audio signal produced from the VTR 11 is provided to the speaker 16 by way of an edition rehearse connection switch 17 to be controlled by the control signal derived from ~he edi-t control circui-t 18 as will be described later. The reproduced siynal from the SMPTE time code signal reproducing magnetic head 8 is supplied to a time code signal reading circuit or reader 19 and the output signal of this time code signal reader 19 is applied to an address display 20, so -that the location of the magnetic tape 1 at present is displayed by the SMPTE
time code signal. l`he time code signal produced in the output side of the time code signal reader 19 is supplied through one connection switch 21a in an in-point deciding switch 21 to an address memory 22 and in addition, the aforesaid time code signal is applied through one connection switch 23a in an out-point deciding switch 23 to the address memory 22 and this time code signal is further supplied to the edit control circuit 18 as the comparing signal.
Numeral 24 designa-tes a capstan shaft whose rotation transports the magnetic tape 1. This capstan shaft 24 is constructed the same as that of a normal VTR, -the rotation of which is controlled by a capstan motor 25.
In this embodiment of the present invention, -the capstan shaft 24 is provided with a frequency generator 26.
The frequency generator 26 is so formed as to generate pulse signals of prede~ermined number, for example, 14 pulse signals having equal interval each ~etween the frame signals when the magnetic tape 1 is transported at a constant speed, in other words, the capstan shaft 24 is rotated at the constant speed. In this case, when the time code signal is produced from the magnetic tape 1 which is transported by the capstan shaft 24, the number of the pulse signals which the frequency generator 26 generates between the frame signals in the time code signal always becomes the predetermined number, for example, 14 irrespective of~-the rotation speed of tile capstan shaft 24. I'he ou-tput pulse signal from the fre~uency genera-tor 26 is ~upplied -to a coun-ter 27 as a count signal. The co~lnter 27 is formed of an up-clown coun-ter which decides to count i-t up or down when a t~pe transporting direction signal is delivered from the time code signal reader 19 thereto. Instead of the tape transporting direction signal, it is possible that the counter 27 may be supplied with a signal derived from a tape speed controller which will be described la-ter.
Also, nuneral 27R denotes a reset signal input terminal through which the frame signal produced from the time code signal in the magnetic tape l is supplied to the counter 27. The aforesaid counter 27 is reset by the frame signal which will be supplied to the reset signal inpu-t terminal 27R. Accordingly, the counter 27 is adapted to count the output pulse signal between the frame signals in the repro-duced time code signal from the Erequency genera-tor 2~
irrespective of the tape transporting direction and the tape speed. The count signal produced on the output side of the counter 27 is supplied through ano-ther connection switch 21b of the in-point decidiny switch 21 -to the address memory 22 and the count signal is also supplied to the address memory 22 ~-ia another connection switch 23b of the out-point decidiny switch 23. In addi-tion, this count signal is applied as the comparing signal to the edit control circuit lR. In this case, it is arranged that the connection switches 21a and ~lb of the in-point deciding switch 21 are simultaneously made QN and OFF. The time code signal and the count signal in -time a-t which the connection switches 21a and 21b are made ON are memorized a-t thé address memory 22 as an edition start -time information signal which will be applied to the edit control circuit 18. Also, the connection switches 23a and 23b in the out-point deciding switch 23 are so arranged that they are respec-tively made ON and OFF simultaneously. The time code signal and the count signal in time at which the connection switches 23a and 23b are made ON are supplied to and memorized in the address memory 22 as an edition end time information signal.
The edition end time information signal th~s stored at the address memory 22 is delivered to the edi-t control circuit 18. Numeral 28 designates an address trim circuit and this address trim circui-t 28 includes an arithme-tic func-tion to supply an address trim signal to the address memory 22 in accordance with operations of a keyboard 29 thereby allowing the edition start-and-end time information signals to be trimmed or corrected. The keyboard 29 is provided wi-th ten keys and keys of "IN" "O~T", "+'and "-". The outputs therefrom are supplied to the address -trim circuit 28.
When the address in the in-poin-t is intended to be trimmed, "IN" key on the keyboard 29 is depressed and if necessary, "+" or "-" key and a numerical key or keys on the ten keys is depressed in response to the desired amount of the trimming, so that the address trim circuit ~8 calculates to change the in-point address which is stored in the address memory 22. In this case, since the trimming using the ten keys is carried out in the unit respon~sive to the input pulse of the counter 27, if the trimming is performed 3~ together with the confirmation by the rehearse operation as described later, it is possible to decide -the accurate edit point oE ~he address.
Numeral 30R represen~s an audio rehearse but-ton, 30E an audio edit button, 31R a spot erase rehearse bu-tton and 31E represents a spot erase bu-tton and signals respec-tively produced therefrom are delivered -to the edi-t control circuit 18. When the audio rehearse button 30R, the audio edit button 30E, the spot erase rehearse button 31R and the spot erase button 31E are respectively operated, the edit control circuit 18 is acti~ated by using a computer incorporated therein to control the audio rehearse operation, the audio edit operation, the spot erase rehearse operation and the spot erase operation respectively. Numeral 15 denotes a tape speed controller which secures within it a potentiometer to be adjusted by a ro-tation of a knob 15a.
The output therefrom is delivered to -the edit control circuit 18, by which the rotation direction and the speed of the capstan motor 25 or a capstan motor (-though no-t shown) of the VTR 11 are controlled. When the knob 15a in the tape speed controller 15 stays at the center thereof, -the capstan motor 25 is stopped. When it is turned in the clockwise direction, the capstan motor 25 is rotated in the normal direction and the rotation speed thereof is increased in accordance with the rotation angle. In case of counter-clockwise direction, although the capstan motor 25 is rotated in a reverse direction thereto, the rotation speed thereof is likewise increased in response to the rotation angle.
In the figure, such a case is illustrated that the rotation speed can be controlled in a range from + two ~0 multiple speed (as compared with the normal play speed) to -~$
two multiple sp~ecl. In this case, while there are providecl various kin~s oE the function keys on the keyboard 29 usecl for the ordinary edition of the video signal to con-trol the edit control circuit 1~, these func-tion keys are not shown in the Eigure because they are not particularly indispensable ~or the ecli-ting system for audio sigllals in the embodiment according to the present invention.
The description of the edit control circuit 1 will proceed further in detail.
A description will first be given to a case where the unnecessary recording audio signal track 4a as seen in Fig. 1 is erased, more specifically, the so-called spo-t-erase is performed.
Since the track 4a is short in length, it is qui-te dif~icult to decide the position of the track ~la if the -tape 1 is transported at the norMal speed. Therefore, the knob 15a in the tape speed controller 15 must be adjus-ted in order that the rotation speed of the capstan motor 25 may become slower than the normal speed. While the reproduced signal ~0 reproduced by the magnetic head 7 in the low speed mode mentioned above is monitored through the speaker 16, the start point of the track 4a is searched and then the tape 1 is stopped. When the track 4a or its s-tart point is not searched once by the afore-said me~hod, the start point of the track 4a can be searched in a manner that the tape 1 is transported in the normal and reverse directions before and after the start point. After the tape 1 is s-topped at the start point of the tracX 4a, keeping this state of the tape 1~ the in-point deciding switch ~1 is operated to supply the SMPT~ time code signal produced at the ou-tput side of the time co~e si~nal reader 19 an~ the count signal produced at the output side of the counter 27 at -that time to the address memory 22 thereby memorized therein as the erase start time information signal.
Next, by the same operation, the tape 1 is stopped at the end point of the trac]i 4a and the o~t-point deciding switch 23 is activated to supply the S~IPTE time code si~nal produced a-t the output side of the time code si~nal reader 13 and the count signal produced at the output side of the counter 27 at that time to the address memory 22 so as to be memorized therein as the erase end time information signal.
With respect to the opera-tions of the in-point deciding switch 21 and the out-point deciding switch 23, such a method may also be possible -that these switches 21 and 23 are operated while the tape 1 is transported and the values of the tirne code signal reader 19 and the counter 27, which will be produced at the instant the switch buttons are depressed, are stored in the address memory 22. But, in this case, because there exists a reaction delay until an operator depresses the switch button in practice since the operator heard the sound, a so-cailed reaction trim is needed.
The above trim is performed in a manner as follows. ~fter the "IN" or "OUT" and "+" or "-" buttons on the keyboard 29 are operated, numerals responsive to the reaction delay time oE the operator are inputted by the ten keys whereby the address of the memory 22 can be trimmed or corrected by the address trim circuit 28.
In this way, the start and end points of the unnecessary track 4a are decided. However, if the erase operation is carried out by the arrangement as set forth above, there is a possibility -tha-t othek par-ts excluding the unnecessary track ~a will be erased and hence it is recommended that the rehearse operation is performed to con:Eirm the above possibility as follows.
When the spo-t erase rehearse button 31R is depressed, the edit control circuit 18 sequentially carries out the following commands. First, the magnetic tape 1 is rewound from the in-point address previousl~ decided to the posi-tion with the predetermined length, namely, a so-called preroll is carried out. Arter the preroll, the tape 1 is transported at the normal speed and at the same time, -the audio signal is reproduced. In this state, the ed.it control circui-t 18 compares the SMPTE time code signal produced in the output side of the time code reader 19 and derived from the magnetic tape 1 and the count signal produced in the ou-tput side of the counter 27 with the erase start time information signal stored in the address memory 22. When these signals are ~ coincided with each other, the edit control circuit 18 produces a muting control signal at i-ts muting con-trol signal output terminal 18d and then delivers it.to th~ muting circuit 14, which is why the audio signal to be applied to the speaker 16 is muted. Next, the edit con-trol circui-t 18 compares the SMPTE time code signal derived from the time code signal reader 19 and the count signal from tne counter 27 with the erase end time information signal memorized in the address memory 22. When these signals are made coinciden-t with each other, the edit control circuit 18 loses the muting control signal at the muting control signal output terminal 18d, so that the muting operation of the mu-ting circuit 14 is released to allow the audio signal to be supplied to the speaker 16. In other words, accordlng to the spot erase rehearse operation, i-t is possible to mute the sound a-t the part which is intended to be erased.
If it becomes clear through the rehearse operation as mentionecl above that the in-point and/or out-point is unsuitable, the keyboard 29 is operated in -the manner same as the afore-mentioned reaction trim to change the addresses thereof, thus permitting the rehearse operation to be performed again. When the portion which is intended to be erased is determined as sa-tisfactory by the spot erase rehearse opera-tion, it is sufficient that the spot erase button 31E is operated and in this case, the edit control circuit 18 operates same as described above. But, since there are some differences on such dis-tances as _ between the reproducing head 7 and the recording head 6 and ~ be-tween the recording head 6 and the erase head 5 as seen in Fig. 2, upon erasing, the erase operation is performed in a timing at which such differences are corrected. The difference among the erase start time information signal derived from the address recording apparatus or address memory 22, the :~ SMPTE time code signal from the time code signal reader 19 and the count signal derived from the counter 27 becomes equal to the aforesaid distance ~ + m, the erase control signal is generated from the erase control signal output terminal 18a, so that the connection switch 10 is closed by the erase control si~nal to supply the erase signal derived from the erase signal generator or generating circuit 9 to the erase head 5 so as to make the erase head ~0 5 in the erasing mode. This erasing mode of the erase head 5 lasts until -the dif~erencc among thc er~se en(l -time information signal stored in the address memory 22, the SMPTE time code signal read out from the -time code signal reader 19 and the count signal derived from the coun-ter 27 becomes equal to the aforesaid ~ n, so tllat thc spot erase operation is kept on. In this case, since the count signal derived from the counter 27 is used in addi-tion -to the SMPTE time code signal, which is the frame signal, to determine the erase start time and the erase end time, it is possible to determine the erase start time and the erase end time of the erase operation with finer unit and the spot erase of -the unnecessary audio signal can be carried out by the automatic operation. Therefore, such an advantage is effected that the spot erase thereto becomes easy.
A description will next be given to a case where signals are partially inserted -thereinto especially when the edition is carried out, namely, a so-called insert edit is performed.
In this case, the edit start time and the edit end time are decided in the same manner as the erase start time and the erase end time mentioned above and the edit start -and-end time ~nformation signals are memorized in the address memory 22.
Also, with respect to the VTR 11, the edit start -and-end time information signals are stored in -the address memory 22 by like operations, where this time, it is enough that only the in-point may be stored.
When the audio rehearse opera-tion is carried out for the audio signal prior to the edition, the audio signal rehearse button 30R is operated.
In -this case, the edit control circuit 18 generates like command -to the VTR 11 at -the same time -the preroll of the magne-tic tape 1, so that -the ma~net.ic -tape 1 and -the VTR 11 are started to be transported in the play modes aEter the preroll was carried ou-t. Next, the edit control circuit 18 compares the SMPTE time code signal produced in the outpu-t side of the time code signal reader 19 from -the magnetic tape 1 and the count signal produced at the output side of the counter 27 with the edit s-tart time information signal s-tored in the address memory 22.
When these signals are coincided with one other, -the muting cont.rol si~nal is produced a-t -the muting control signa:L
output terminal 18d of the edit control circuit 18 and then delivered to the muting circui-t 1~ to perform the muting operation thereof. At the same time, the edit control circuit 18 produces the audio rehearse control signal at its audio rehearse control signal output terminal 18c whereby the connection switch 17 is closed by this audio rehearse control signal to supply the audio signal derived from the VTR 11 to the speaker 16. The aforesaid state lasts from the edit start time to the edit end time. When the SMPTE
time code signal derived from the time code reader 19, the coun-t signal from the counter 27 and the edit end time information signal memorized in the address memory 22 become coincident with each other, the respective con-trol signals are lost a~ the control signal output terminals 18c and 18d, so that the connection switch 17 is made OF~ and the muting operation of the muting circuit 14 is released.
In other words, in accordance with the audio rehearse ~0 operation thus described, the reproduced signal from the reproducing head 7 is supplied to the spea~er 16 upon normal mode while the auclio signal derived from the VTR
11 which will be inserted thereinto is supplied -to the speaker 16 between the edi-t start-and-end times by which the s-tate of the tape 1 after the eclition was completed can be known from the sound -the speaker 16 reproduces.
If there still remains an inconvenience, i-t is enough tha-t the trim opera-tion is performed in -the manner same as described above. If the edited state oE the tape 1 is approved as satisfactory through this auclio rehea.rse operation, the audio edit button 30E is depressed to activate the edit control circuit 18 in the manner same as the aforesaid audio rehearse mode. Bu-t, as described above, since the respective heads 5, 6 and 7 have the distance diEferences thereamong, the switch 10 is con-trolled to be turned ON in a manner faster than the memorized address by the amount of Q + m and the switch 12 is controlled to be made ON in a manner fas-ter than the memorized address by the amount of m and the switches 10 and 12 are controlled to be made OFF in a manner faster than the memorized address by like amounts, respectively, thereby to perform the insert edit.
In this case, since the count signal derived from the counter 27 is also used in addition to the SMPTE time ~5 code signal, which is the frame signal, in order to decide the edit start-and-end times like the spot erase, it is possible to decide the aforesaid edit start-and-end times with finer unit and hence such advantage is brought about that the edition of the tape can be performed with finer unit.
While in the description men-tioned above is disclosed the insert edit, it can be easily unders-tood that the editing system Eor audio si~nals accordin~ to the present invention can also be applied to a case where tlle signal is simply connec-ted to the signal, namely, a so~called assemble edit.
As described above, in accordance with the embodiment of the present invention, the coun-t signal derived from the counter 27, in other words, -the address signal is prepared between the SMPTE time code signals, which are the frame signals, and the frame and address signals are s utilized to edit the audio signal, so that this audio signal can be edited and corrected with finer unit and therefore, the spot erase can be carried out easily. Also, according ~o the embodiment as described above! since the address signal between the frame signals is ob-tained from the frequency generator 26 provided in connection with the capstan shaft 24, it is possible to achieve tne address si~nal with a predetermined interval relative -to the ma~netic tape 1 free from the transporta-tion speed of the magne-tic tape 1. Consequen-tly, although tape 1 is transported a-t the low speed, the address of the address memory 22 is decided and there is a little influence caused by the reaction delay due to the operator, so that the address can be decided faster than that of the prior art editor.
While in the afore-described embodiment of the present invention, the frequency genera-tor 26 is provided in association with the capstan shaft 2~ to achieve the address signal be-tween the frame signals, instead of the frequency generator 26, such a variation or modification may also be possible that there is provided a so-called coun-ter roller having a rotary shaft to be rotated by -the feeding of the tape in connection wi-th which a pulse gellerator is provided.
While the afore-men-ti.oned embodiment of the present inverlt.ion describes a case where the SMPTE signal is utilized as the time code signal, it is needless to say tha-t ins-tead of the SMPTE signal, o-ther time code signal such as VITC (Video Intermedi.ate Time Code) sigllal can be used in which the time code signal is recorded during one horizontal blanking period of the video signal like the time code signal disclosed in U.S. Pa-tent No.4,159,480 issued on June 26, 1979.
The above description is given on a single preferred embodiment of the invention, but it will be apparent that many modifications and varia-tions could be effected by one skilled in the art without departinc~ from the spirits or scope of the novel concepts of the invention, so that the scope of the invention should be determined by -the appended claims only.
Claims (12)
1. An editing system for audio signals comprising:
a) a helical scan video tape recorder including means for recording and reproducing an audio signal longitudinal-ly on a magnetic tape, means for reproducing an address signal from said tape, means for moving said magnetic tape, means for selecting operation modes of said video tape recorder and means for generating pulse signals correspond-ing to a moving speed of said magnetic tape;
b) means for monitoring said audio signal; and c) editing control means including speed control means for controlling said magnetic tape moving means so as to change a moving speed of said tape and to find an editing point, means for reading said address signal supplied from said video tape recorder, means for counting said pulse signals memory means for storing output signals from said reading means and counting means at said editing point, and means for controlling said operation mode selecting means in response to said stored output signals in said memory means.
a) a helical scan video tape recorder including means for recording and reproducing an audio signal longitudinal-ly on a magnetic tape, means for reproducing an address signal from said tape, means for moving said magnetic tape, means for selecting operation modes of said video tape recorder and means for generating pulse signals correspond-ing to a moving speed of said magnetic tape;
b) means for monitoring said audio signal; and c) editing control means including speed control means for controlling said magnetic tape moving means so as to change a moving speed of said tape and to find an editing point, means for reading said address signal supplied from said video tape recorder, means for counting said pulse signals memory means for storing output signals from said reading means and counting means at said editing point, and means for controlling said operation mode selecting means in response to said stored output signals in said memory means.
2. An editing system for audio signals according to claim 1, wherein said controlling means includes said address signal reading means and a circuit for comparing output signals produced from said counting means with said stored output signals derived from said memory means.
3. An editing system for audio signals according to claim 1, wherein said controlling means further includes second memory means for storing second output signals produced from said reading means and counting means at the second editing point.
4. An editing system for audio signals according to claim 3, wherein said controlling means controls said operation mode selecting means in response to outputs of the second memory means.
5. An editing system for audio signals according to claim 1, wherein said video tape recorder includes erasing means for erasing recorded audio signals and said erasing means is activated by said selecting means in response to said stored output signals.
6. An editing system for audio signals according to claim 1, wherein said address signal reproducing means includes a magnetic head for reproducing the address signal recorded on the longitudinal direction of the tape.
7. An editing system for audio signals according -to claim 1, wherein the VTR includes a reproducing rotary magnetic head for reproducing the video signal and said address signal reproducing means includes a circuit for removing the address signal from the reproduced signal reproduced by said rotary magnetic head.
8. An editing system for audio signals according to claim 1, wherein said editing control means includes a manual switch for supplying the output signals generated from the reading means and counting means to the memory means.
9. An editing system for audio signals according to claim 1, wherein said editing control means includes means for making said monitoring means inoperative in response to said stored output signals.
10. An editing system for audio signals according to claim 1, wherein said editing control means includes a circuit for trimming the contents of the memory means by using a keyboard and the operation thereof.
11. An editing system for audio signals according to claim 1, wherein said tape moving means is a capstan and said pulse signal generating means is a pulse generator mounted in association with the capstan.
12. An editing system for audio signals according to claim 1, wherein said pulse signal generating means is made of rotation means to be rotated by the movement of the tape and the pulse generator mounted in connection therewith.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8207/81 | 1981-01-22 | ||
| JP56008207A JPS57121380A (en) | 1981-01-22 | 1981-01-22 | Editing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1181167A true CA1181167A (en) | 1985-01-15 |
Family
ID=11686793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000394452A Expired CA1181167A (en) | 1981-01-22 | 1982-01-19 | Editing system for audio signals |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4819087A (en) |
| EP (1) | EP0057086B1 (en) |
| JP (1) | JPS57121380A (en) |
| AT (1) | ATE11193T1 (en) |
| CA (1) | CA1181167A (en) |
| DE (1) | DE3261785D1 (en) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57121380A (en) * | 1981-01-22 | 1982-07-28 | Sony Corp | Editing device |
| JPS61261887A (en) * | 1985-05-16 | 1986-11-19 | Matsushita Electric Ind Co Ltd | Magnetic recording and reproducing device |
| US4945425A (en) * | 1987-03-30 | 1990-07-31 | Videonics Incorporated | Method and an apparatus for controlling a video cassette recorder |
| AU620036B2 (en) * | 1987-06-11 | 1992-02-13 | Sony Corporation | Apparatus and method for recording or reproducing video and audio information with editing capability for editing recording information |
| US5126851A (en) * | 1987-06-16 | 1992-06-30 | Canon Kabushiki Kaisha | Video system using two different kinds of recording media |
| JPS648575A (en) * | 1987-06-30 | 1989-01-12 | Toshiba Corp | Video recording and reproducing device |
| US5225945A (en) * | 1988-02-24 | 1993-07-06 | Sony Corporation | Apparatus for editing pcm signals reproduced at different speeds from two memories |
| JPH02132678A (en) * | 1988-11-11 | 1990-05-22 | Canon Inc | Information signal recording device |
| JP2624867B2 (en) * | 1990-03-27 | 1997-06-25 | シャープ株式会社 | Recording position correction circuit of digital information recording / reproducing device |
| US5272572A (en) * | 1991-02-26 | 1993-12-21 | Alliant Techsystems Inc. | Apparatus and method for use in appending data to data previously written on a tape in a helical scan tape recorder system |
| EP0551944B1 (en) * | 1992-01-16 | 1997-08-20 | Koninklijke Philips Electronics N.V. | Arrangement for recording an information signal in a track on a record carrier |
| US5280314A (en) * | 1992-04-20 | 1994-01-18 | Ron Hymes | Film streamer cuing system and projection system |
| JP3431930B2 (en) * | 1992-06-16 | 2003-07-28 | キヤノン株式会社 | Rotating head type recording / reproducing device |
| JPH06282965A (en) * | 1993-03-26 | 1994-10-07 | Sony Corp | Video editing device |
| EP0694243B1 (en) | 1993-04-16 | 2001-08-22 | Avid Technology, Inc. | Method and apparatus for synchronizing a stream of picture data with a corresponding stream of audio data |
| US5625570A (en) * | 1994-06-07 | 1997-04-29 | Technicolor Videocassette, Inc. | Method and system for inserting individualized audio segments into prerecorded video media |
| JP2731354B2 (en) * | 1994-10-25 | 1998-03-25 | ローム株式会社 | Motor control device |
| KR0172465B1 (en) * | 1994-11-11 | 1999-04-15 | 김광호 | Edit recording apparatus |
| KR960030218A (en) * | 1995-01-12 | 1996-08-17 | 김광호 | Video signal automatic editing method and device |
| US5742730A (en) * | 1995-03-09 | 1998-04-21 | Couts; David A. | Tape control system |
| US6424483B1 (en) * | 1995-11-21 | 2002-07-23 | Matsushita Electric Industrial Co., Ltd. | Control system of tape travel for a magnetic recording and reproducing apparatus |
| US6778756B1 (en) * | 1999-06-22 | 2004-08-17 | Matsushita Electric Industrial Co., Ltd. | Countdown audio generation apparatus and countdown audio generation system |
| KR100499608B1 (en) * | 2002-05-23 | 2005-07-07 | 엘지전자 주식회사 | Method for dubbing audio on rewritable medium |
| JP4173146B2 (en) * | 2005-03-18 | 2008-10-29 | 富士通株式会社 | Method for erasing data from magnetic tape storage media |
| KR20110024551A (en) * | 2009-09-02 | 2011-03-09 | 삼성전자주식회사 | Apparatus and method for removing pop-up noise in a portable terminal |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL130280C (en) * | 1963-02-15 | |||
| US3978521A (en) * | 1972-08-23 | 1976-08-31 | U.S. Philips Corporation | Recording and playback apparatus for video tape editing |
| JPS5290222A (en) * | 1976-01-23 | 1977-07-29 | Sony Corp | Automatic compiler |
| US4100607A (en) * | 1977-02-07 | 1978-07-11 | Convergence Corporation | Computer for video tape editing system |
| DE2727760C3 (en) * | 1977-06-21 | 1981-01-15 | Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig, 8510 Fuerth | Automatic execution of electronic cuts |
| JPS6057146B2 (en) * | 1977-10-17 | 1985-12-13 | ソニー株式会社 | video tape recorder |
| US4249218A (en) * | 1978-11-01 | 1981-02-03 | Minnesota Mining And Manufacturing Company | Method and apparatus for editing digitally recorded audio signals |
| US4214278A (en) * | 1978-11-30 | 1980-07-22 | Scp Producer's Services Limited | Editing system for videotape sound |
| SE451513B (en) * | 1979-05-31 | 1987-10-12 | Sony Corp | SET AND DEVICE FOR EDITING DIGITAL SIGNALS |
| JPS5677960A (en) * | 1979-11-27 | 1981-06-26 | Sony Corp | Generating circuit of counter clock signal for tape counter |
| US4365313A (en) * | 1980-04-11 | 1982-12-21 | Sony Corporation | Cue control apparatus |
| JPS57121380A (en) * | 1981-01-22 | 1982-07-28 | Sony Corp | Editing device |
-
1981
- 1981-01-22 JP JP56008207A patent/JPS57121380A/en active Granted
-
1982
- 1982-01-19 CA CA000394452A patent/CA1181167A/en not_active Expired
- 1982-01-21 US US06/341,282 patent/US4819087A/en not_active Expired - Fee Related
- 1982-01-21 EP EP82300307A patent/EP0057086B1/en not_active Expired
- 1982-01-21 AT AT82300307T patent/ATE11193T1/en active
- 1982-01-21 DE DE8282300307T patent/DE3261785D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4819087A (en) | 1989-04-04 |
| ATE11193T1 (en) | 1985-01-15 |
| EP0057086B1 (en) | 1985-01-09 |
| JPH035111B2 (en) | 1991-01-24 |
| JPS57121380A (en) | 1982-07-28 |
| DE3261785D1 (en) | 1985-02-21 |
| EP0057086A1 (en) | 1982-08-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |