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WO1992017019A1 - Combine telephonique a suppression de bruits - Google Patents

Combine telephonique a suppression de bruits Download PDF

Info

Publication number
WO1992017019A1
WO1992017019A1 PCT/DK1992/000091 DK9200091W WO9217019A1 WO 1992017019 A1 WO1992017019 A1 WO 1992017019A1 DK 9200091 W DK9200091 W DK 9200091W WO 9217019 A1 WO9217019 A1 WO 9217019A1
Authority
WO
WIPO (PCT)
Prior art keywords
microphone
handset
microphones
noise
receiver
Prior art date
Application number
PCT/DK1992/000091
Other languages
English (en)
Inventor
Kaj Børge HANSEN
Original Assignee
Kirk Acoustics A/S
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 Kirk Acoustics A/S filed Critical Kirk Acoustics A/S
Publication of WO1992017019A1 publication Critical patent/WO1992017019A1/fr

Links

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
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Definitions

  • the invention concerns a telephone instrument of the type stated in the introductory portion of claim 1.
  • the remote field sensitivity is in both cases approximate- ly the same for frequences below 1 kHz, but only with an optimally positioned handset is the signal/noise ratio acceptable.
  • JP 1-42966 discloses a telephone instrument of the type stated in the opening paragraph.
  • the two microphones are of different types, and precisely because different microphones are used with different direction and frequency characteris ⁇ tics, it is necessary to adjust the substraction means of the microphones, i.e. an additional circuit for the con ⁇ nection of the microphones.
  • the object of the invention is to produce a telephone with a handset of the type stated in the opening paragraph, which is better and cheaper than the known noise-reducing handset.
  • the second microphone is identical with the first micro ⁇ phone, that the second microphone is negatively fed back to the first microphone, and that it is arranged at a dis ⁇ tance from the first microphone.
  • the second microphone is arranged near the receiver and is directed towards the face in the position of use like the first microphone.
  • the two microphones are preferably two uniform standard microphones which are mass-produced and are therefore in- expensive .
  • the distance a from the mouth opening to the openings in the handset to the first microphone is about 18 mm.
  • the distance b from the mouth opening to the openings of the handset to the second microphone is about 120 mm.
  • the microphone end of the handset is no longer kept optimally, but is lowered e.g. 50 mm, whereby the distance a from the mouth to the first microphone increases to 53 mm, the distance to the second microphone will still be considerably greater than the distance to the first micro ⁇ phone, so that the microphones will still have speech sen ⁇ sitivity.
  • the acoustic impedance of the remote field or the noise signal will be approximately the same for the two microphones since both of them are directed toward the face with the same distance to the skin.
  • the noise signal will therefore be well outbalanced to a degree depending upon the type and position of the noise sources.
  • the second microphone Since the distance between the microphones corresponds to the halfwave of the acoustic oscillation of 1.5 kHz, the second microphone will be in phase with the first micro- phone at this frequency and will therefore cause a slight increase in sensitivity. This is not desirable, and the input holes to the acoustic volume in front of the second microphone are therefore constructed as an acoustic low- pass filter with a cut-off frequency of about 1.5 kHz.
  • the outbalancing of the remote field will therefore be limited to frequences below 1.5 kHz, and it is also in this low frequency range that the most speech recognition disturb ⁇ ing noise generators occur. According to the invention it is possible to outbalance the remote field entirely with ⁇ out using subtraction means, solely because both micro- phones are serially connected in opposition.
  • the reduction of the near field sensiti ⁇ vity of the original microphone can easily be kept below 2 dB with a number of alternative positions of the second microphone. It should be mentioned that the smaller the distance between the microphones, the greater the fre ⁇ quency range covered.
  • the input openings and the volume in front of the second microphone are arranged such that the cut-off frequency of the acoustic low-pass filter formed thereby reduces the sensitivity of this microphone outside the desired frequency range.
  • An additional advantage of the microphone of the invention over the microphone in JP 1-42966 is that because of the two identical microphones there is no need for a connec- tion and disconnection facility like in JP 1-42966, just as the subtraction means in JP 1-42966 adds to the costs. Finally, the two microphones in JP 1-42966 cannot be serially connected because they are different.
  • the handset of the inven ⁇ tion does not require additional power supply wires like the Japanese publication. Accordingly, telephone instru ⁇ ments can freely be supplied with one or two microphones without there being any other differences.
  • Preferred microphone types are electromagnetic or in par ⁇ ticular electrodynamic ones rather than electret micro ⁇ phones, because it is then possible to manufacture hand ⁇ sets according to the invention which can readily replace existing handsets without noise reducing properties, with ⁇ out having to change the actual telephone instrument.
  • fig. 1 shows a handset according to the invention seen from the side facing the user's head
  • fig. 2 is a longitudinal section through the handset of fig. 1, and
  • fig. 3 shows a measured comparison between noise transfer via a handset according to the invention, curve A, and a known handset, curve B.
  • the drawing shows a handset 1 which contains a first, ordinary microphone 2 and a receiver 3. Also a second microphone 4 is mounted near the receiver 3, as shown in fig. 2.
  • the microphones are uniform standard moving coil microphones which are directed toward the user's face, the handset being formed with openings 5 and 6 for the first microphone and the second microphone, respectively, and openings 7 for the receiver 3. These openings are shaped so as to form suitable acoustic impedances for the subject three transducers 2, 3 and 4.
  • the openings 6 moreover form an acoustic low-pass filter which cuts off frequences above 1.5 kHz.
  • Fig. 3 shows a measurement result obtained by letting the handset transfer a random, but constant noise field from its surroundings, i.e. a remote field through a telephone link, the noise being measured in dB at the receiver end, distributed over the actual frequency range.
  • the curve A shows the measurement for the handset of the invention
  • the curve B shows the measurement for the same handset, but with the openings 6 closed, so that the noise compensating effect of the microphone 4 is can ⁇ celled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

Le combiné (1) d'un instrument téléphonique, qui est composé d'un microphone (2) et d'un récepteur (3) disposés de manière normale, est muni en plus d'un deuxième microphone (4). Le deuxième microphone (4) est relié par un circuit de contreréaction au premier microphone ordinaire (2) et est agencé à proximité du récepteur (3), et comme le premier microphone (2) est dirigé vers le visage de l'utilisateur. Ces deux microphones permettant de compenser largement le champ éloigné et de réduire les bruits tout en n'influençant que de manière négligeable la sensibilité à la parole. De cette manière on obtient des rapports signaux/bruit améliorés.
PCT/DK1992/000091 1991-03-21 1992-03-20 Combine telephonique a suppression de bruits WO1992017019A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK50991A DK50991A (da) 1991-03-21 1991-03-21 Telefonapparat med en mikrotelefon
DK0509/91 1991-03-21

Publications (1)

Publication Number Publication Date
WO1992017019A1 true WO1992017019A1 (fr) 1992-10-01

Family

ID=8094370

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1992/000091 WO1992017019A1 (fr) 1991-03-21 1992-03-20 Combine telephonique a suppression de bruits

Country Status (2)

Country Link
DK (1) DK50991A (fr)
WO (1) WO1992017019A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595457A1 (fr) * 1992-10-29 1994-05-04 Andrea Electronics Corporation Dispositif d'annulation de bruit
US5625684A (en) * 1993-02-04 1997-04-29 Local Silence, Inc. Active noise suppression system for telephone handsets and method
US5673325A (en) * 1992-10-29 1997-09-30 Andrea Electronics Corporation Noise cancellation apparatus
DE19852805A1 (de) * 1998-11-15 2000-05-18 Florian M Koenig Telefon mit verbesserter Sprachverständlichkeit
EP1139337A1 (fr) * 2000-03-31 2001-10-04 Telefonaktiebolaget L M Ericsson (Publ) Procédé de transmission d'information de parole et dispositif de communication correspondant
WO2001075863A1 (fr) * 2000-03-31 2001-10-11 Telefonaktiebolaget Lm Ericsson (Publ) Procede de transmission d'informations vocales et dispositif de communication electronique destine a la transmission d'informations vocales
WO2005069279A1 (fr) * 2003-12-22 2005-07-28 Sony Ericsson Mobile Communication Ab Processeurs audio multimodaux et procedes de fonctionnement
GB2413722A (en) * 2004-04-27 2005-11-02 Clarity Technologies Inc Multi microphone system for hand-held device
US7309314B2 (en) 2003-09-23 2007-12-18 U.S. Department Of Veterans Affairs Method for predicting apnea-hypopnea index from overnight pulse oximetry readings

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625345A (en) * 1985-03-26 1986-12-02 Wood Lorin A Automated sofa bed

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4773091A (en) * 1986-06-16 1988-09-20 Northern Telecom Limited Telephone handset for use in noisy locations

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4773091A (en) * 1986-06-16 1988-09-20 Northern Telecom Limited Telephone handset for use in noisy locations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 13, No. 86, E720; & JP,A,63 263 865, (31.10.1988), NEC CORP. *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595457A1 (fr) * 1992-10-29 1994-05-04 Andrea Electronics Corporation Dispositif d'annulation de bruit
US5381473A (en) * 1992-10-29 1995-01-10 Andrea Electronics Corporation Noise cancellation apparatus
US5673325A (en) * 1992-10-29 1997-09-30 Andrea Electronics Corporation Noise cancellation apparatus
CN1041042C (zh) * 1992-10-29 1998-12-02 安德烈电子公司 消噪设备以及采用消噪设备的电话手机
US5625684A (en) * 1993-02-04 1997-04-29 Local Silence, Inc. Active noise suppression system for telephone handsets and method
DE19852805A1 (de) * 1998-11-15 2000-05-18 Florian M Koenig Telefon mit verbesserter Sprachverständlichkeit
EP1139337A1 (fr) * 2000-03-31 2001-10-04 Telefonaktiebolaget L M Ericsson (Publ) Procédé de transmission d'information de parole et dispositif de communication correspondant
WO2001075863A1 (fr) * 2000-03-31 2001-10-11 Telefonaktiebolaget Lm Ericsson (Publ) Procede de transmission d'informations vocales et dispositif de communication electronique destine a la transmission d'informations vocales
US7309314B2 (en) 2003-09-23 2007-12-18 U.S. Department Of Veterans Affairs Method for predicting apnea-hypopnea index from overnight pulse oximetry readings
WO2005069279A1 (fr) * 2003-12-22 2005-07-28 Sony Ericsson Mobile Communication Ab Processeurs audio multimodaux et procedes de fonctionnement
CN100559471C (zh) * 2003-12-22 2009-11-11 索尼爱立信移动通讯股份有限公司 多模声频处理器及其操作方法
GB2413722A (en) * 2004-04-27 2005-11-02 Clarity Technologies Inc Multi microphone system for hand-held device

Also Published As

Publication number Publication date
DK50991D0 (da) 1991-03-21
DK50991A (da) 1992-09-22

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