WO1997042746A1 - Sound guide for speech communicators - Google Patents

Sound guide for speech communicators Download PDF

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Publication number
WO1997042746A1
WO1997042746A1 PCT/SE1997/000623 SE9700623W WO9742746A1 WO 1997042746 A1 WO1997042746 A1 WO 1997042746A1 SE 9700623 W SE9700623 W SE 9700623W WO 9742746 A1 WO9742746 A1 WO 9742746A1
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WO
WIPO (PCT)
Prior art keywords
cover
flip
sound
telephone
sound guide
Prior art date
Application number
PCT/SE1997/000623
Other languages
French (fr)
Inventor
Per-Håkan PERSSON
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU27954/97A priority Critical patent/AU2795497A/en
Publication of WO1997042746A1 publication Critical patent/WO1997042746A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
    • H04M1/0208—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings characterized by the relative motions of the body parts
    • H04M1/0214—Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • H04M1/0216—Foldable in one direction, i.e. using a one degree of freedom hinge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Definitions

  • the invention relates to an improvement in the sound take-up in a portable telephone/speech communicator, such as a mobile telephone, a cordless telephone or a walkie-talkie etc, with the aid of an air/sound guide which, applied to the telephone, guides the speech to the microphone.
  • a portable telephone/speech communicator such as a mobile telephone, a cordless telephone or a walkie-talkie etc
  • Portable speech communicators such as mobile telephones, often have the microphone placed inside the body of the telephone and in that end closest to the mouth to obtain the best possible sound take-up.
  • SNR signal/noise ratio
  • EP 0 275 996 discloses a telephone with a so-called semi- active flip-cover, which can be swung out from the body of the telephone for conversation.
  • This flip-cover is used to guide, via a sound inlet therein, sound from the mouth into the microphone located inside the body of the telephone.
  • the sound inlet consists of a slot in the flip-cover and an ear channel leading to the body of the telephone with its micro- phone, which is disposed in the "speaking end" of the telephone body, i.e. the end connected to the flip-cover. It is, however, difficult in design with flip-covers to insulate the sound guide from "useless" sound, i.e. surrounding noise and distur-bances, actually all sound which is not the user's speech.
  • the microphone is placed in the end of the cover.
  • it is relatively unprotected and it is also difficult to make a reliable electrical contact between the flip-cover and the body of the telephone.
  • It is also difficult to protect the microphone and the contact junction against radio frequency interference, since the wires which must be laid from the microphone into the tele-phone body will function as antennas.
  • Another disadvantage of having a micro-phone in the flip-cover is that it is more expensive to manufacture than if the flip-cover is only used as a simple sound guide inside the body of the telephone.
  • Portable speech communicators thus have a problem caused by the market demand for units which are as small as possible.
  • the communicator usually a telephone
  • the communicator is quite simply too short for the speaking end to come sufficiently close to the mouth to provide good sound quality. Too much of the surrounding noise is taken up together with the speech.
  • a cover which can be flipped out from the speaking end, a greater proportion of the speech can be collected, a so-called passive flip-cover.
  • an ear passage/tunnel can be arranged on the flip-cover or within the same up to the microphone, which is most often placed within the body of the telephone since it must be protected against physical harm and in order to shield it from inter- ference, a so-called semi-active flip-cover.
  • the invention is therefore intended to solve the problems which arise with the semi-active flip-cover, i.e. when there is an ear channel/sound guide from the cover up to a microphone placed in the body of the telephone.
  • the problem with such a design is finding a good method of insulating the sound guide from all sounds which are not speech.
  • it is difficult to achieve a good seal, which is very important since no surrounding noise should be allowed to leak into the microphone .
  • an air guide according to the prior art see EP 0 275 996
  • the invention solves these problems in a simple and inexpensive manner from the point of view of production costs by using a flexible sound-tight tube in a single piece without any moving parts or sharp edges.
  • the sound guide which can be fixed to the flip-cover or be mounted inside the same, guides sound from the opening/sound inlet at the end of the cover to the microphone which is placed inside the body of the telephone.
  • the flip-cover is folded in against the body of the telephone and the sound guide is folded up.
  • the invention makes it suitable to manufacture a telephone with a semi-active flip-cover at a lower cost than a telephone with an active flip-cover (the microphone in the flip-cover) .
  • the cost will also be lower than for the traditional model with a semi-active flip-cover since fewer parts are needed.
  • the flip-cover can be made with a simpler shape, and satisfactory speech quality is obtained without having to take a number of quality increasing steps .
  • the absence of sharp angles in the sound guide provides better acoustic properties. By virtue of the fact that the sound guide is made as a single component molded in one piece, there will be no joints where noise can leak in or speech leak out.
  • Figure 1 shows a side view of the speaking end of a prior art portable telephone with the flip-cover folded out
  • Figure 2 shows a side view of a portable telephone according to the invention with the flip-cover folded out
  • Figure 3 shows the same telephone with the flip-cover folded in.
  • Figure 1 shows the speaking end 1 of a cordless telephone with the flip-cover 2 in the folded out position and a sound guide 3 of known design. It can be seen that the sound guide, which in this case is located inside the flip-cover, is a rigid and segmented air passage. At the pivot axis of the flip-cover the sound guide is there-fore divided and sealing material 4 must thus be used at the junction to prevent noise from leaking into the microphone 5.
  • FIG. 2 shows in accordance with the invention a cordless telephone 10 of modern type, which can be a mobile telephone with radio communication to outdoor local base stations which in turn are coupled to mobile exchanges, or e.g. a DECT- telephone for indoor use in a company with radio communication to small local base stations on the company premises, for example, said base stations in turn being coupled to a PBX.
  • a cordless telephone 10 can also be a cordless telephone for private use of the type which is relatively common in private homes, or a walkie talkie. All these types of speech communicators are being made smaller and smaller.
  • a flip-cover 11 is used to collect the speech and guide it to the microphone 12.
  • a soft narrow plastic hose 13 is applied onto the flip-cover.
  • the plastic hose functions as a sound guide and collects the speech from the mouth of the telephone user.
  • the sound guide 13 lying on top of the flip-cover 11 can be glued to the same or fixed in some other manner; e.g. the flip-cover which is preferably of hard plastic, can be molded with some form of eye which the sound guide can be slipped through.
  • Another conceivable embodiment would be to press the plastic hose into a suitable groove which can run, for example, along the edge of the flip-cover to a microphone placed in the body of the telephone.
  • the sound guide can be placed inside the flip-cover, presupposing that the flip-cover is molded with a hollow passage for the sound guide, which in this case would be well protected against external damage.
  • the sound guide is of course hollow and has an opening 14 in its end closest to the mouth of the speaker.
  • the sound waves generated by the speech which in reality are compressed and expanded areas of the air medium, are propagated via the opening 14 into the sound guide as variations in pressure.
  • the sound guide runs along the flip-cover into the body of the telephone and it is manufactured in one piece so that no other disturbances can leak in, as would be the case if it had been segmented.
  • a microphone 12 is often placed in a small cavity with rubber walls as protection against undesired noise caused by impact against the body of the telephone.
  • the microphone is placed in the speech portion of the tele-phone, i.e. that end to which the flip- cover is joined. By having the microphone in-side the body of the telephone itself instead of in the flip-cover, it is also protected against radio frequency interference.
  • the sound guide leads from the flip-cover via the pivot axis 15 of the flip-cover and into the cavity in the telephone body where the microphone 12 is placed, without any sharp edges or bends which would impair the sound quality.
  • Figure 3 shows the telephone with the flip-cover 11 folded in. It shows how the sound guide is bent conformingly 16 at the pivot axis of the flip-cover, since it is preferably made of soft plastic. It is of course also possible to make the sound guide of some other flexible material such as silicon, rubber, textile or woven material. The primary important feature is in any case that it be made in one piece.

Abstract

Within the technical area of wireless telephony, development is towards smaller and smaller telephones. Since they are now so small that they do not reach from the ear all the way to the mouth of the speaker, a flip-cover (11) must be used to 'collect' the sound. The invention describes a sound guide (13) in the form of a hollow soft flexible tube which extends from the flip-cover into the body (10) of the telephone and collects the speech. The sound guide is manufactured in one piece and is flexible in order to be able to be folded (16) when the flip-cover is closed. It can be disposed both on top of the flip-cover as well as inside it.

Description

SOUND GUIDE FOR SPEECH COMMUNICATORS
TECHNICAL FIELD
The invention relates to an improvement in the sound take-up in a portable telephone/speech communicator, such as a mobile telephone, a cordless telephone or a walkie-talkie etc, with the aid of an air/sound guide which, applied to the telephone, guides the speech to the microphone.
THE STATE OF THE ART
Portable speech communicators, such as mobile telephones, often have the microphone placed inside the body of the telephone and in that end closest to the mouth to obtain the best possible sound take-up. By placing the microphone close to the mouth, the ratio of direct sound from the speaker to the noise contributed by the surroundings is large, thus providing a high signal/noise ratio (SNR) . Since we are progressing towards smaller and smaller mobile telephones, this means that the telephones are starting to become so small that they hardly "reach" the mouth if held in conversation position, i.e. pressed to the ear.
EP 0 275 996 discloses a telephone with a so-called semi- active flip-cover, which can be swung out from the body of the telephone for conversation. This flip-cover is used to guide, via a sound inlet therein, sound from the mouth into the microphone located inside the body of the telephone. The sound inlet consists of a slot in the flip-cover and an ear channel leading to the body of the telephone with its micro- phone, which is disposed in the "speaking end" of the telephone body, i.e. the end connected to the flip-cover. It is, however, difficult in design with flip-covers to insulate the sound guide from "useless" sound, i.e. surrounding noise and distur-bances, actually all sound which is not the user's speech. In another known concept, with a so-called active flip-cover, the microphone is placed in the end of the cover. In this case, it is relatively unprotected and it is also difficult to make a reliable electrical contact between the flip-cover and the body of the telephone. It is also difficult to protect the microphone and the contact junction against radio frequency interference, since the wires which must be laid from the microphone into the tele-phone body will function as antennas. Another disadvantage of having a micro-phone in the flip-cover is that it is more expensive to manufacture than if the flip-cover is only used as a simple sound guide inside the body of the telephone.
DESCRIPTION OF THE INVENTION
Portable speech communicators thus have a problem caused by the market demand for units which are as small as possible. The communicator, usually a telephone, is quite simply too short for the speaking end to come sufficiently close to the mouth to provide good sound quality. Too much of the surrounding noise is taken up together with the speech. By placing on the telephone body a cover which can be flipped out from the speaking end, a greater proportion of the speech can be collected, a so-called passive flip-cover. In order to additionally improve the sound quality, an ear passage/tunnel can be arranged on the flip-cover or within the same up to the microphone, which is most often placed within the body of the telephone since it must be protected against physical harm and in order to shield it from inter- ference, a so-called semi-active flip-cover. An alternative is the active cover where the microphone is placed at the distal end of the flip-cover to place it close to the mouth. This makes the design more complicated and thus more expensive, i.e. an additional disadvantage to be added to the greater sensitivity to disturbances and the physical vulnerability.
The invention is therefore intended to solve the problems which arise with the semi-active flip-cover, i.e. when there is an ear channel/sound guide from the cover up to a microphone placed in the body of the telephone. The problem with such a design is finding a good method of insulating the sound guide from all sounds which are not speech. At the hinge for the flip-cover, it is difficult to achieve a good seal, which is very important since no surrounding noise should be allowed to leak into the microphone . With an air guide according to the prior art (see EP 0 275 996) there will be problems since the sound guide is rigid and must therefore be section-ed to be able to be folded when the flip-cover is folded in. At the junction between the sections there must be some form of seal so that no "useless" noise will come in or "useful" speech leak out. In order to achieve this, a complicated design is re-quired but it is still difficult to prevent all leakage. The prior art reveals a design with sealing material at the pivot axis of the flip-cover. A sound guide which is divided into rigid segments also has sharp angles, in this case the angle between the flip-cover and the telephone. This results in a weakening of the sound pressure which eventually reaches the microphone. The design will also suffer from wear since the flip-cover is opened and closed many times during the life of the tele-phone. This is particularly serious for the seal required in the junction between the flip-cover and the body of the telephone.
The invention solves these problems in a simple and inexpensive manner from the point of view of production costs by using a flexible sound-tight tube in a single piece without any moving parts or sharp edges.
When the telephone is in the conversation position, i.e. with the flip-cover out, the sound guide, which can be fixed to the flip-cover or be mounted inside the same, guides sound from the opening/sound inlet at the end of the cover to the microphone which is placed inside the body of the telephone. When the telephone is not in the conversation position, the flip-cover is folded in against the body of the telephone and the sound guide is folded up.
The invention makes it suitable to manufacture a telephone with a semi-active flip-cover at a lower cost than a telephone with an active flip-cover (the microphone in the flip-cover) . The cost will also be lower than for the traditional model with a semi-active flip-cover since fewer parts are needed. The flip-cover can be made with a simpler shape, and satisfactory speech quality is obtained without having to take a number of quality increasing steps . The absence of sharp angles in the sound guide provides better acoustic properties. By virtue of the fact that the sound guide is made as a single component molded in one piece, there will be no joints where noise can leak in or speech leak out.
DESCRIPTION OF THE FIGURES
One embodiment of the invention will be described below with reference to the accompanying drawings of which:
Figure 1 shows a side view of the speaking end of a prior art portable telephone with the flip-cover folded out,
Figure 2 shows a side view of a portable telephone according to the invention with the flip-cover folded out, and
Figure 3 shows the same telephone with the flip-cover folded in.
PREFERRED EMBODIMENT
In this preferred embodiment there will be described, with reference to the Figures, how a sound guide can be applied to a speech communicator in a simple manner.
Figure 1 shows the speaking end 1 of a cordless telephone with the flip-cover 2 in the folded out position and a sound guide 3 of known design. It can be seen that the sound guide, which in this case is located inside the flip-cover, is a rigid and segmented air passage. At the pivot axis of the flip-cover the sound guide is there-fore divided and sealing material 4 must thus be used at the junction to prevent noise from leaking into the microphone 5.
Figure 2 shows in accordance with the invention a cordless telephone 10 of modern type, which can be a mobile telephone with radio communication to outdoor local base stations which in turn are coupled to mobile exchanges, or e.g. a DECT- telephone for indoor use in a company with radio communication to small local base stations on the company premises, for example, said base stations in turn being coupled to a PBX. Conceivably it can also be a cordless telephone for private use of the type which is relatively common in private homes, or a walkie talkie. All these types of speech communicators are being made smaller and smaller. In order to improve the sound quality, a flip-cover 11, as shown in the Figure, is used to collect the speech and guide it to the microphone 12. According to the invention, a soft narrow plastic hose 13 is applied onto the flip-cover. The plastic hose functions as a sound guide and collects the speech from the mouth of the telephone user. The sound guide 13 lying on top of the flip-cover 11 can be glued to the same or fixed in some other manner; e.g. the flip-cover which is preferably of hard plastic, can be molded with some form of eye which the sound guide can be slipped through. Another conceivable embodiment would be to press the plastic hose into a suitable groove which can run, for example, along the edge of the flip-cover to a microphone placed in the body of the telephone. In an additional embodiment, the sound guide can be placed inside the flip-cover, presupposing that the flip-cover is molded with a hollow passage for the sound guide, which in this case would be well protected against external damage.
The sound guide is of course hollow and has an opening 14 in its end closest to the mouth of the speaker. The sound waves generated by the speech, which in reality are compressed and expanded areas of the air medium, are propagated via the opening 14 into the sound guide as variations in pressure. The sound guide runs along the flip-cover into the body of the telephone and it is manufactured in one piece so that no other disturbances can leak in, as would be the case if it had been segmented.
Inside the body of the telephone, a microphone 12 is often placed in a small cavity with rubber walls as protection against undesired noise caused by impact against the body of the telephone. The microphone is placed in the speech portion of the tele-phone, i.e. that end to which the flip- cover is joined. By having the microphone in-side the body of the telephone itself instead of in the flip-cover, it is also protected against radio frequency interference.
The sound guide leads from the flip-cover via the pivot axis 15 of the flip-cover and into the cavity in the telephone body where the microphone 12 is placed, without any sharp edges or bends which would impair the sound quality.
Figure 3 shows the telephone with the flip-cover 11 folded in. It shows how the sound guide is bent conformingly 16 at the pivot axis of the flip-cover, since it is preferably made of soft plastic. It is of course also possible to make the sound guide of some other flexible material such as silicon, rubber, textile or woven material. The primary important feature is in any case that it be made in one piece.

Claims

1. Device for sound take-up in a speech communicator, such as a land mobile radio, a walkie talkie, a mobile telephone or a cordless telephone (10) , with a flip-cover (11) which can be folded out from the body of the telephone, characterized in that a tubular sound guide (13) of arbitrary geometric cross section and size runs from the flip-cover (11) in one piece to the body of the telephone, - that the sound guide is of flexible material, that a microphone is placed in the body of the telephone and in connection with the sound guide.
2. Device for sound take-up in a speech communicator (10) according to claim 1, characterized in that the sound guide is applied on the flip-cover (11) .
3. Device for sound take-up in a speech communicator (10) according to claim 1, characterized in that the sound guide is disposed inside the flip-cover in a cavity therein.
4. Device for sound take-up in a speech communicator (10) according to claim 1, characterized in that the sound guide is disposed in a groove along the flip-cover.
5. Device for sound take-up in a speech communicator (10) according to one of claims 1 - 4 , characterized in that the sound guide (13) is made of rubber, silicon, soft plastic, airtight textile or woven material, for example.
6. Device for sound take-up in a speech communicator (10) according to one of claims 1 - 5, characterized in that the sound guide is folded (16) together in a single piece when the flip-cover is folded in towards the body of the telephone .
7. Method of sound take-up in a speech communicator (10) , such as a land mobile radio, a walkie talkie, a mobile telephone or a cordless telephone, where speech is collected by a flip-cover (11) which can be folded out from the body of the telephone, characterized in that the air pressure variations caused by the speech are supplied to a sound guide (13) disposed on or in the flip-cover (11) , said sound guide conducting via its opening (14) , in a single flexible piece, the sound into the body of the telephone where a microphone (12) is placed in conjunction with the sound guide .
PCT/SE1997/000623 1996-05-03 1997-04-14 Sound guide for speech communicators WO1997042746A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27954/97A AU2795497A (en) 1996-05-03 1997-04-14 Sound guide for speech communicators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9601701A SE9601701L (en) 1996-05-03 1996-05-03 Audio Conductor for Speech Communicators
SE9601701-7 1996-05-03

Publications (1)

Publication Number Publication Date
WO1997042746A1 true WO1997042746A1 (en) 1997-11-13

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ID=20402449

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000623 WO1997042746A1 (en) 1996-05-03 1997-04-14 Sound guide for speech communicators

Country Status (3)

Country Link
AU (1) AU2795497A (en)
SE (1) SE9601701L (en)
WO (1) WO1997042746A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998059483A1 (en) * 1997-06-23 1998-12-30 Ericsson Inc. Acoustic pipe for flip style cellular telephone
US5881150A (en) * 1996-08-29 1999-03-09 Telefonaktiebolaget Lm Ericsson Hinge mechanism having a sound guide
WO2001033815A1 (en) * 1999-11-04 2001-05-10 Ericsson Inc Radiotelephone with a battery pack including an acoustic passageway
EP1679861A1 (en) * 1998-03-18 2006-07-12 Nokia Corporation Foldable telephone

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275996A2 (en) * 1987-01-23 1988-07-27 Siemens Aktiengesellschaft Handset for a telephone apparatus with a lid covering the keyboard
US5197091A (en) * 1989-11-20 1993-03-23 Fujitsu Limited Portable telephone having a pipe member which supports a microphone
GB2292650A (en) * 1994-07-06 1996-02-28 Victor John Lawton Privacy device for mobile telephones

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275996A2 (en) * 1987-01-23 1988-07-27 Siemens Aktiengesellschaft Handset for a telephone apparatus with a lid covering the keyboard
US5197091A (en) * 1989-11-20 1993-03-23 Fujitsu Limited Portable telephone having a pipe member which supports a microphone
GB2292650A (en) * 1994-07-06 1996-02-28 Victor John Lawton Privacy device for mobile telephones

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5881150A (en) * 1996-08-29 1999-03-09 Telefonaktiebolaget Lm Ericsson Hinge mechanism having a sound guide
WO1998059483A1 (en) * 1997-06-23 1998-12-30 Ericsson Inc. Acoustic pipe for flip style cellular telephone
US6965790B1 (en) 1997-06-23 2005-11-15 Ericsson Inc. Acoustic pipe for flip style cellular telephone
EP1679861A1 (en) * 1998-03-18 2006-07-12 Nokia Corporation Foldable telephone
US7519404B2 (en) 1998-03-18 2009-04-14 Nokia Corporation Telescopic telephone
WO2001033815A1 (en) * 1999-11-04 2001-05-10 Ericsson Inc Radiotelephone with a battery pack including an acoustic passageway
US6470176B1 (en) 1999-11-04 2002-10-22 Ericsson Inc. Battery packs that facilitate acoustic communications and radiotelephones incorporating same

Also Published As

Publication number Publication date
SE9601701D0 (en) 1996-05-03
AU2795497A (en) 1997-11-26
SE9601701L (en) 1997-11-04

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