US2265216A - Multiplex telephony system - Google Patents

Multiplex telephony system Download PDF

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Publication number
US2265216A
US2265216A US269034A US26903439A US2265216A US 2265216 A US2265216 A US 2265216A US 269034 A US269034 A US 269034A US 26903439 A US26903439 A US 26903439A US 2265216 A US2265216 A US 2265216A
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cathode
tube
anode
ray beam
successively
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US269034A
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Wolf Menno
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/02—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused
    • H01J31/06—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused with more than two output electrodes, e.g. for multiple switching or counting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/045—Distributors with CRT

Definitions

  • My invention relates to multiplex telephony systems using cathode-ray tubes for current distribution.
  • my invention is concerned with systems comprising a cathode-ray tube serving as 'a current distributor at the transmitter and having a common anode connected to the transmission line which is common to all channels and each of its electrodes connected to one of the speech channels, and a cathoderay tube serving as a current distributor at the receiver and having a control electrode connected to the transmission line and a plurality of anodes each connected to one of the speech channels.
  • the system also comprises synchronously-acting means for deflecting the cathode-ray beams of the tubes in such a manner that at the transmitter the beam successively passes the control electrodes and is modulated by the voltages applied to these electrodes, and that at the receiver the-beam successively strikes the anodes and successively connects the speech channels to the transmission line.
  • control electrodes or anodes are usually equally spaced apart on a circular arc, and the deflecting means produce an electric or magnetic rotating field to cause the cathode-ray beam to be successively modulated by the voltages applied to the control electrodes, and at the receiver to cause the beam to successively strike the anodes. Furthermore, the deflecting means are such as to cause the cathode-ray beam to be moved at a uniform speed.
  • One object oi. my invention is to increase the periods of time available for the transmission of conversation in such systems.
  • a further object is to decrease cross-talk between the various speech channels.
  • I provide means for deflecting the cathode-ray beam in a single direction and arrange the control electrodes or anodes side by side in the direction of movement of the cathode-ray beam.
  • deflecting means which produce an electric field or magnetic field whose intensity increases from an initial value in jumps to a final value and then decreases abruptly to the initial value.
  • the time required for the passage of the cathode-ray beam between successive electrodes or anodes is exceedingly small, and as a result the time available for the transmission of conversation is materially increased and the cross-talk between the various speech channels is reduced.
  • Fig. 1 is a schematic diagram of a telephony system embodying the invention.
  • Fig. 2 is a graph giving a voltage-time curve.
  • the multiplex telephony system illustrated in Figure 1, which serves to transmit four speech channels, comprises a transmitter and a receiver connected by a common transmission line 5.
  • the four channels are connected successively and periodically to the transmission line 5 at both the receiver and transmitter, and for this-purpose the transmitter and receiver are provided with cathode-ray tubes 6 and [6 respectively.
  • Cathode-ray tube 6 has at one end an electrode system for producing the cathode-ray beam, which system comprises an incandescible cathode I heated from a suitable source (not shown), a cylindrical auxiliary electrode 8, and a first anode 9 connected to a positive potential.
  • a screen In provided with four slit-like apertures 30. Behind each of the apertures 30 is arranged a pair of electrodes ll shown as two electrically-interconnected parallel rods of conductive material. Each pair of the electrodes ii is electrically connected to one of the transmitting channels l---4. Behind electrodes II is. an anode I! which is Y connected to the transmission line 5.
  • Adjacent the first anode 9 is a pair of parallel deflecting plates 13 which are connected to a voltage-producing device l4.
  • Device I4 is adapted to apply across plates l3 a voltage E which varies stepwise with time and has a course as shown in Fig. 2.
  • the voltage varies in four steps and the time between these steps is very small and considerably less than the time during which the voltage of each step is applied.
  • the cathode-ray tube It which serves to connect the transmission line 5 successively and 55 periodically to each of the receiving lines 3
  • an electrode system for producing the cathode-ray beam which system comprises an incandescible cathode l'l connected to a suitable supply of heating current (not shown), a control electrode l8 connected to transmission line 5, and a first anode l9 connected to a positive potential.
  • Adjacent the first anode I9 is a pair of parallel deflecting plates 2
  • Device 22 which may be similar to device l4, serves to produce a voltage E, such as shown in Fig. 2, across plates 2
  • a generator which produces a deflecting voltage of the shape shown in Fig. 2, and which is suitable for use as the generators l4 or 22 is described in the U. S. Patent #1,955,332.
  • the cathoderay beam of the tube 8 passes successively through the slit-like apertures 30 and between the corresponding electrodes H upon anode l2.
  • the beam is modulated by the voltages produced in the lines I to 4 and applied to the control electrodes II, with the result that the so-modulated anode current is transmitted via the transmission line to the receiver.
  • the cathoderay beam successively passes through the apertures 30 and passes through each aperture for a time period indicated by At in Figure 2, during which the anode current is modulated by the voltages produced in the corresponding line
  • a current modulated successively by the voltages produced in lines I to 4 is transmitted over the transmission line 5 to the control electrode I 8 of tube "5, with the result that the intensity of the cathode-ray beam of this tube is controlled successively and periodically in accord ance with the voltages produced in lines 1-4.
  • the cathode-ray beam of tube I6 is given a movement in synchronism with that of the cathode-ray beam of tube 6, so that during the time interval At during which the cathode-ray beam of tube 6 is being modulated, for example by the voltages produced in line I, the cathode-ray beam of tube i6 strikes the anode 20 connected to line 3
  • the voltage-producing device 22 must be synchronized with device I4.
  • the transmission of the conversations in lines 2, 3 and 4 to the lines 32, 33 and 34 is effected in a similar way.
  • the movement of the cathode-ray beam of tube 6 be in synchronism with that of the cathode-ray beam of tube l6, and in the system illustrated the desired synchronism is obtained in a very simple manner. More particularly, the anode current of tube 6 is suppressed during each time period 1- in which the cathode-ray beam moves from one slit-shaped aperture 30 to the next one, and there is periodic interruption in the oscillations transmitted through transmission line 5 between each two successive jumps of the cathode-ray beam of tube 6.
  • a filter 23 e. g.
  • a cathode-ray tube serving as a current distributor and having a plurality of control electrodes each connected to one channel and a common anode, a transmission line common to all channels and connected to the anode of said tube, and means to deflect the cathode-ray beam of said tube stepwise and to cause the same to successively strike the control electrodes of said tube, said means comprising a device for producing a deflecting field whose intensity increases in steps.
  • a cathode-ray tube serving as a current distributor and having a plurality of control electrodes arranged side by side in a line and each connected to one channel and a common anode, a transmission line common to all channels and connected to the anode of said tube, and means to deflect the cathode-ray beam of said tube stepwise and to cause the same to successively strike the control electrodes thereof, said means including a device for producing a deflecting field whose intensity increases in steps from an initial value to a predetermined value and then decreases rapidly to the initial value.

Description

Dec. 9, 1941. M. WOLF 2,265,216
MULTIPLEX TELEPHONY SYSTEM Filed April 20, 1939 Ranhn ilk: IE TRANSMITTING E]- CHANNEL6 o VOLTAGE mow/cave Oil/I65 t 11, I I0 v0. 77! a: mom/am; va /c1:
J4. Woff fa mum flTTOR/VEY Patented Dec. 9, 1941 MULTIPLEX TEL PHONY srs'mu Mcnno Wolf, Eindhoven, Netherlands, assignor, by mesne assignments, to Hartford National Bank and Trust Company, Hartford, Conn., as
trustee I Application April 20, 1939, Serial No. 269,034
In Germany April 23, 1938 2 Claims. (Cl. 179-15) My invention relates to multiplex telephony systems using cathode-ray tubes for current distribution.
More specifically, my invention is concerned with systems comprising a cathode-ray tube serving as 'a current distributor at the transmitter and having a common anode connected to the transmission line which is common to all channels and each of its electrodes connected to one of the speech channels, and a cathoderay tube serving as a current distributor at the receiver and having a control electrode connected to the transmission line and a plurality of anodes each connected to one of the speech channels. The system also comprises synchronously-acting means for deflecting the cathode-ray beams of the tubes in such a manner that at the transmitter the beam successively passes the control electrodes and is modulated by the voltages applied to these electrodes, and that at the receiver the-beam successively strikes the anodes and successively connects the speech channels to the transmission line.
In known systems of the above type the control electrodes or anodes are usually equally spaced apart on a circular arc, and the deflecting means produce an electric or magnetic rotating field to cause the cathode-ray beam to be successively modulated by the voltages applied to the control electrodes, and at the receiver to cause the beam to successively strike the anodes. Furthermore, the deflecting means are such as to cause the cathode-ray beam to be moved at a uniform speed.
One object oi. my invention is to increase the periods of time available for the transmission of conversation in such systems.
A further object is to decrease cross-talk between the various speech channels.
Further objects and advantages of my invention will appear as the description progresses.
In accordance with the invention 1 provide deflecting means of such a type that the cathoderay beam is displaced in jumps or stepwise from one control electrode or anode to the next control electrode or anode.
In one embodiment of the invention I provide means for deflecting the cathode-ray beam in a single direction and arrange the control electrodes or anodes side by side in the direction of movement of the cathode-ray beam. In this case I prefer to employ deflecting means which produce an electric field or magnetic field whose intensity increases from an initial value in jumps to a final value and then decreases abruptly to the initial value.
By using the invention in systems of the above-described type, the time required for the passage of the cathode-ray beam between successive electrodes or anodes is exceedingly small, and as a result the time available for the transmission of conversation is materially increased and the cross-talk between the various speech channels is reduced.
In order that the invention may be clearly understood and readily carried into eflect, I shall describe the same in more detail with reference to the accompanying drawing, in which,
Fig. 1 is a schematic diagram of a telephony system embodying the invention, and
Fig. 2 is a graph giving a voltage-time curve. The multiplex telephony system illustrated in Figure 1, which serves to transmit four speech channels, comprises a transmitter and a receiver connected by a common transmission line 5. The four channels are connected successively and periodically to the transmission line 5 at both the receiver and transmitter, and for this-purpose the transmitter and receiver are provided with cathode-ray tubes 6 and [6 respectively.
Cathode-ray tube 6 has at one end an electrode system for producing the cathode-ray beam, which system comprises an incandescible cathode I heated from a suitable source (not shown), a cylindrical auxiliary electrode 8, and a first anode 9 connected to a positive potential. At the other end of the tube is a screen In provided with four slit-like apertures 30. Behind each of the apertures 30 is arranged a pair of electrodes ll shown as two electrically-interconnected parallel rods of conductive material. Each pair of the electrodes ii is electrically connected to one of the transmitting channels l---4. Behind electrodes II is. an anode I! which is Y connected to the transmission line 5. Adjacent the first anode 9 is a pair of parallel deflecting plates 13 which are connected to a voltage-producing device l4. Device I4 is adapted to apply across plates l3 a voltage E which varies stepwise with time and has a course as shown in Fig. 2.
As shown in Figure 2, the voltage varies in four steps and the time between these steps is very small and considerably less than the time during which the voltage of each step is applied.
The cathode-ray tube It, which serves to connect the transmission line 5 successively and 55 periodically to each of the receiving lines 3| to 34 comprises at one end an electrode system for producing the cathode-ray beam, which system comprises an incandescible cathode l'l connected to a suitable supply of heating current (not shown), a control electrode l8 connected to transmission line 5, and a first anode l9 connected to a positive potential. Arranged at the other end of the tube on a circular are are four anodes 20 each connected to one of the receiving lines 3| to 34. Adjacent the first anode I9 is a pair of parallel deflecting plates 2| connected to a voltage device 22. Device 22, which may be similar to device l4, serves to produce a voltage E, such as shown in Fig. 2, across plates 2| to thereby deflect the cathode-ray beam, and cause the same to successively strike anodes 20 and move in steps. A generator which produces a deflecting voltage of the shape shown in Fig. 2, and which is suitable for use as the generators l4 or 22 is described in the U. S. Patent #1,955,332.
During operation of the system the cathoderay beam of the tube 8 passes successively through the slit-like apertures 30 and between the corresponding electrodes H upon anode l2. At the same time the beam is modulated by the voltages produced in the lines I to 4 and applied to the control electrodes II, with the result that the so-modulated anode current is transmitted via the transmission line to the receiver. As the voltage applied to the deflecting plates l3 follows the curve shown in Fig. 2, the cathoderay beam successively passes through the apertures 30 and passes through each aperture for a time period indicated by At in Figure 2, during which the anode current is modulated by the voltages produced in the corresponding line |4. At the end of each time period At the cathoderay beam moves in a jump to the next aperture 30, and as this movement takes place in a very short time (1), substantially no time is wasted for the transmission of speech. After the cathode-ray beam has struck anode l2 whilepassing through one of the apertures 30 at the end of the screen, the beam abruptly returns to the aperture 30 at the other end of the screen,
whereupon the beam again passes successively through the apertures.
A current modulated successively by the voltages produced in lines I to 4 is transmitted over the transmission line 5 to the control electrode I 8 of tube "5, with the result that the intensity of the cathode-ray beam of this tube is controlled successively and periodically in accord ance with the voltages produced in lines 1-4.
The cathode-ray beam of tube I6 is given a movement in synchronism with that of the cathode-ray beam of tube 6, so that during the time interval At during which the cathode-ray beam of tube 6 is being modulated, for example by the voltages produced in line I, the cathode-ray beam of tube i6 strikes the anode 20 connected to line 3|. For this purpose the voltage-producing device 22 must be synchronized with device I4. The transmission of the conversations in lines 2, 3 and 4 to the lines 32, 33 and 34 is effected in a similar way.
It is of course necessary that the movement of the cathode-ray beam of tube 6 be in synchronism with that of the cathode-ray beam of tube l6, and in the system illustrated the desired synchronism is obtained in a very simple manner. More particularly, the anode current of tube 6 is suppressed during each time period 1- in which the cathode-ray beam moves from one slit-shaped aperture 30 to the next one, and there is periodic interruption in the oscillations transmitted through transmission line 5 between each two successive jumps of the cathode-ray beam of tube 6. Thus to synchronize the device 22 with the device l4 it is only necessary to obtain these interruptions from the oscillations received via the transmission line 5. For this purpose I connect a filter 23, e. g. an amplitude filter, between the line 5 and device 22, and control the device 22 in known manner with the impulses occurring in the output circuit of this filter. The above-mentioned patent describes a method of controlling such generators by means of synchronizing impulses produced when the stepwise increase of the deflecting voltage takes place.
While I have described my invention in connection with a specific example and with reference to certain constructions, I do not wish to be limited thereto as obvious modifications will occur to a person skilled in the art.
What I claim is:
1. In a multiplex telephony system having a plurality of channels, a cathode-ray tube serving as a current distributor and having a plurality of control electrodes each connected to one channel and a common anode, a transmission line common to all channels and connected to the anode of said tube, and means to deflect the cathode-ray beam of said tube stepwise and to cause the same to successively strike the control electrodes of said tube, said means comprising a device for producing a deflecting field whose intensity increases in steps.
2. In a multiplex telephony system having a plurality of channels, a cathode-ray tube serving as a current distributor and having a plurality of control electrodes arranged side by side in a line and each connected to one channel and a common anode, a transmission line common to all channels and connected to the anode of said tube, and means to deflect the cathode-ray beam of said tube stepwise and to cause the same to successively strike the control electrodes thereof, said means including a device for producing a deflecting field whose intensity increases in steps from an initial value to a predetermined value and then decreases rapidly to the initial value. I
MENNO WOLF.
US269034A 1938-04-23 1939-04-20 Multiplex telephony system Expired - Lifetime US2265216A (en)

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Cited By (45)

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US2420374A (en) * 1944-07-01 1947-05-13 Rca Corp Pulse multiplex transmission system
US2427670A (en) * 1941-12-06 1947-09-23 Alfred N Goldsmith Radio centercasting system
US2434189A (en) * 1943-11-30 1948-01-06 Electronbeam Ltd Multiple regulator system
US2436677A (en) * 1942-12-31 1948-02-24 Rca Corp Incremental deflection of cathoderay beam
US2437027A (en) * 1943-01-12 1948-03-02 John H Homrighous Time division multiplex communication system
US2446945A (en) * 1942-08-25 1948-08-10 Rca Corp Electronic computing device
US2447233A (en) * 1943-04-07 1948-08-17 Standard Telephones Cables Ltd Pulse time modulation multiplex receiver
US2448487A (en) * 1945-06-14 1948-08-31 Gen Railway Signal Co Selective signaling system
US2454773A (en) * 1943-04-07 1948-11-30 Standard Telephones Cables Ltd Pulse multiplex transmitter employing a cathode-ray tube time modulator
US2465380A (en) * 1944-11-25 1949-03-29 Standard Telephones Cables Ltd Cathode-ray tube pulse separation and demodulation system
US2468085A (en) * 1946-08-24 1949-04-26 Fed Telecomm Lab Inc Two-way pulse multichannel system employing cathode-ray tube modulators
US2472774A (en) * 1945-10-17 1949-06-07 Farnsworth Res Corp Irregular interlace scanning system
US2474223A (en) * 1946-01-26 1949-06-28 Standard Telephones Cables Ltd Electron tube
US2474811A (en) * 1946-10-05 1949-07-05 Fed Telecomm Lab Inc Translating system
US2474810A (en) * 1947-03-22 1949-07-05 Int Standard Electric Corp Multichannel cyclophon
US2476966A (en) * 1945-10-25 1949-07-26 Paul M Erlandson Radial beam tube assembly
US2489253A (en) * 1946-06-18 1949-11-29 Walter L Andre Multisignal recording system with signal identification
US2492346A (en) * 1946-10-05 1949-12-27 Fed Telecomm Lab Inc Translator
US2492136A (en) * 1946-03-14 1949-12-27 Fed Telecomm Lab Inc Electronic telephone exchange
US2496633A (en) * 1947-12-24 1950-02-07 Bell Telephone Labor Inc Multitarget cathode-ray device
US2498688A (en) * 1946-06-22 1950-02-28 Fed Telecomm Lab Inc Demodulator and channel separator system
US2499844A (en) * 1947-01-16 1950-03-07 Philco Corp Receiver for pulse-position-modulation systems
US2501791A (en) * 1944-08-10 1950-03-28 Stanolind Oil & Gas Co Inkless recorder
US2506612A (en) * 1946-01-25 1950-05-09 Fed Telecomm Lab Inc Electronic communication system
US2516886A (en) * 1945-09-11 1950-08-01 Standard Telephones Cables Ltd Cathode-ray tube modulator
US2524708A (en) * 1947-02-06 1950-10-03 Gen Electric Co Ltd Pulse multiplex receiving system
US2524789A (en) * 1946-07-27 1950-10-10 Standard Telephones Cables Ltd Multichannel time modulated pulse receiving system
US2531817A (en) * 1945-08-04 1950-11-28 Rca Corp Compensated channel selector
US2532719A (en) * 1944-10-16 1950-12-05 John H Homrighous Dimensional radio communication system
US2533405A (en) * 1945-09-15 1950-12-12 Nat Union Radio Corp Demodulation apparatus for pulse multiplex pulse time modulated signals
US2536654A (en) * 1947-01-04 1951-01-02 Rca Corp Pulse multiplex transmission system
US2537991A (en) * 1945-05-14 1951-01-16 Standard Telephones Cables Ltd Pulse multiplex drop channel system
US2543738A (en) * 1947-11-15 1951-02-27 Rca Corp Time division pulse multiplex system
US2553572A (en) * 1947-11-10 1951-05-22 Int Standard Electric Corp Cross talk reduction in pulse multiplex receiver systems
US2556179A (en) * 1946-03-02 1951-06-12 Int Standard Electric Corp Multiple pulse producing system
US2560772A (en) * 1948-03-16 1951-07-17 Gen Electric Co Ltd Multichannel pulse signaling system
US2565102A (en) * 1941-03-15 1951-08-21 Products & Licensing Corp System for connecting a single channel with a plurality of channels in periodical succession
US2568779A (en) * 1947-08-14 1951-09-25 Veaux Henri Maurice Multiplex system for telegraphic and radiotelegraphic transmission with decametric waves
US2599949A (en) * 1948-06-24 1952-06-10 Nat Union Radio Corp Electronic stepping switch
US2605360A (en) * 1947-03-10 1952-07-29 Rca Corp Time division multiplex system utilizing a step-wave generator in the distributor circuit
US2612563A (en) * 1948-06-14 1952-09-30 British Telecomm Res Ltd Telegraph distributor
US2696522A (en) * 1944-01-22 1954-12-07 Robert H Rines Visual reproduction of distant objects
US3076146A (en) * 1945-12-27 1963-01-29 Bell Telephone Labor Inc Cathode beam tube circuit having means for converting current variations to stepped waveform
US3104316A (en) * 1945-08-20 1963-09-17 Philip H Allen Registers
US3131263A (en) * 1961-12-18 1964-04-28 Bell Telephone Labor Inc Data transmission system

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565102A (en) * 1941-03-15 1951-08-21 Products & Licensing Corp System for connecting a single channel with a plurality of channels in periodical succession
US2427670A (en) * 1941-12-06 1947-09-23 Alfred N Goldsmith Radio centercasting system
US2446945A (en) * 1942-08-25 1948-08-10 Rca Corp Electronic computing device
US2436677A (en) * 1942-12-31 1948-02-24 Rca Corp Incremental deflection of cathoderay beam
US2437027A (en) * 1943-01-12 1948-03-02 John H Homrighous Time division multiplex communication system
US2454773A (en) * 1943-04-07 1948-11-30 Standard Telephones Cables Ltd Pulse multiplex transmitter employing a cathode-ray tube time modulator
US2447233A (en) * 1943-04-07 1948-08-17 Standard Telephones Cables Ltd Pulse time modulation multiplex receiver
US2434189A (en) * 1943-11-30 1948-01-06 Electronbeam Ltd Multiple regulator system
US2696522A (en) * 1944-01-22 1954-12-07 Robert H Rines Visual reproduction of distant objects
US2420374A (en) * 1944-07-01 1947-05-13 Rca Corp Pulse multiplex transmission system
US2501791A (en) * 1944-08-10 1950-03-28 Stanolind Oil & Gas Co Inkless recorder
US2532719A (en) * 1944-10-16 1950-12-05 John H Homrighous Dimensional radio communication system
US2465380A (en) * 1944-11-25 1949-03-29 Standard Telephones Cables Ltd Cathode-ray tube pulse separation and demodulation system
US2537991A (en) * 1945-05-14 1951-01-16 Standard Telephones Cables Ltd Pulse multiplex drop channel system
US2448487A (en) * 1945-06-14 1948-08-31 Gen Railway Signal Co Selective signaling system
US2531817A (en) * 1945-08-04 1950-11-28 Rca Corp Compensated channel selector
US3104316A (en) * 1945-08-20 1963-09-17 Philip H Allen Registers
US2516886A (en) * 1945-09-11 1950-08-01 Standard Telephones Cables Ltd Cathode-ray tube modulator
US2533405A (en) * 1945-09-15 1950-12-12 Nat Union Radio Corp Demodulation apparatus for pulse multiplex pulse time modulated signals
US2472774A (en) * 1945-10-17 1949-06-07 Farnsworth Res Corp Irregular interlace scanning system
US2476966A (en) * 1945-10-25 1949-07-26 Paul M Erlandson Radial beam tube assembly
US3076146A (en) * 1945-12-27 1963-01-29 Bell Telephone Labor Inc Cathode beam tube circuit having means for converting current variations to stepped waveform
US2506612A (en) * 1946-01-25 1950-05-09 Fed Telecomm Lab Inc Electronic communication system
US2474223A (en) * 1946-01-26 1949-06-28 Standard Telephones Cables Ltd Electron tube
US2556179A (en) * 1946-03-02 1951-06-12 Int Standard Electric Corp Multiple pulse producing system
US2492136A (en) * 1946-03-14 1949-12-27 Fed Telecomm Lab Inc Electronic telephone exchange
US2489253A (en) * 1946-06-18 1949-11-29 Walter L Andre Multisignal recording system with signal identification
US2498688A (en) * 1946-06-22 1950-02-28 Fed Telecomm Lab Inc Demodulator and channel separator system
US2524789A (en) * 1946-07-27 1950-10-10 Standard Telephones Cables Ltd Multichannel time modulated pulse receiving system
US2468085A (en) * 1946-08-24 1949-04-26 Fed Telecomm Lab Inc Two-way pulse multichannel system employing cathode-ray tube modulators
US2492346A (en) * 1946-10-05 1949-12-27 Fed Telecomm Lab Inc Translator
US2474811A (en) * 1946-10-05 1949-07-05 Fed Telecomm Lab Inc Translating system
US2536654A (en) * 1947-01-04 1951-01-02 Rca Corp Pulse multiplex transmission system
US2499844A (en) * 1947-01-16 1950-03-07 Philco Corp Receiver for pulse-position-modulation systems
US2524708A (en) * 1947-02-06 1950-10-03 Gen Electric Co Ltd Pulse multiplex receiving system
US2605360A (en) * 1947-03-10 1952-07-29 Rca Corp Time division multiplex system utilizing a step-wave generator in the distributor circuit
US2474810A (en) * 1947-03-22 1949-07-05 Int Standard Electric Corp Multichannel cyclophon
US2568779A (en) * 1947-08-14 1951-09-25 Veaux Henri Maurice Multiplex system for telegraphic and radiotelegraphic transmission with decametric waves
US2553572A (en) * 1947-11-10 1951-05-22 Int Standard Electric Corp Cross talk reduction in pulse multiplex receiver systems
US2543738A (en) * 1947-11-15 1951-02-27 Rca Corp Time division pulse multiplex system
US2496633A (en) * 1947-12-24 1950-02-07 Bell Telephone Labor Inc Multitarget cathode-ray device
US2560772A (en) * 1948-03-16 1951-07-17 Gen Electric Co Ltd Multichannel pulse signaling system
US2612563A (en) * 1948-06-14 1952-09-30 British Telecomm Res Ltd Telegraph distributor
US2599949A (en) * 1948-06-24 1952-06-10 Nat Union Radio Corp Electronic stepping switch
US3131263A (en) * 1961-12-18 1964-04-28 Bell Telephone Labor Inc Data transmission system

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FR853355A (en) 1940-03-18
CH210435A (en) 1940-07-15
BE433923A (en)

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