WO1995029571A3 - Apparatus including a sound transducer - Google Patents

Apparatus including a sound transducer Download PDF

Info

Publication number
WO1995029571A3
WO1995029571A3 PCT/IB1995/000215 IB9500215W WO9529571A3 WO 1995029571 A3 WO1995029571 A3 WO 1995029571A3 IB 9500215 W IB9500215 W IB 9500215W WO 9529571 A3 WO9529571 A3 WO 9529571A3
Authority
WO
WIPO (PCT)
Prior art keywords
sound
electrical signal
transducer
antiphase
source sound
Prior art date
Application number
PCT/IB1995/000215
Other languages
French (fr)
Other versions
WO1995029571A2 (en
Inventor
Bryan David Young
Alan Frederick Dadds
Original Assignee
Philips Electronics Nv
Philips Norden Ab
Philips Electronics Uk Ltd
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 Philips Electronics Nv, Philips Norden Ab, Philips Electronics Uk Ltd filed Critical Philips Electronics Nv
Publication of WO1995029571A2 publication Critical patent/WO1995029571A2/en
Publication of WO1995029571A3 publication Critical patent/WO1995029571A3/en

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
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Telephone Function (AREA)

Abstract

A part of an apparatus (14) for receiving human vocal output comprises a first transducer (20) to convert a source sound into an electrical signal, an amplifier (24) to amplify the electrical signal and a second transducer (16) for converting the amplified electrical signal into a sound wave substantially in antiphase with the source sound. The first and second transducers (20, 16) are located close together and the amplitude of source sound which 'spills over' around the apparatus is reduced considerably by the antiphase sound signal. The apparatus has particular application to cellular telephones and walkie-talkies for increasing privacy and reducing disturbance to nearby people.
PCT/IB1995/000215 1994-04-20 1995-03-29 Apparatus including a sound transducer WO1995029571A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9407819.3 1994-04-20
GB9407819A GB9407819D0 (en) 1994-04-20 1994-04-20 Apparatus including a sound transducer

Publications (2)

Publication Number Publication Date
WO1995029571A2 WO1995029571A2 (en) 1995-11-02
WO1995029571A3 true WO1995029571A3 (en) 1995-11-16

Family

ID=10753825

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1995/000215 WO1995029571A2 (en) 1994-04-20 1995-03-29 Apparatus including a sound transducer

Country Status (2)

Country Link
GB (1) GB9407819D0 (en)
WO (1) WO1995029571A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2819362A1 (en) * 2001-01-05 2002-07-12 Rene Travere ATTENUATOR, INTERFERENCE, CONVERSATION APPLIED TO THE TELEPHONE
FI20055590L (en) * 2005-11-03 2007-05-04 Wearfone Oy Method and apparatus for wireless sound generation to a user's ear

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983790A (en) * 1953-04-30 1961-05-09 Rca Corp Electronic sound absorber
DE4127473A1 (en) * 1991-08-20 1993-02-25 Guenter Dr Stahr Noise cancellation using electronic signal processing and delay - exploits destructive interference between incoming noise and compensating sound emitted with appropriate delay by directional loudspeaker
WO1994019894A1 (en) * 1993-02-16 1994-09-01 Berger Douglas L Voice transmission systems with voice cancellation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983790A (en) * 1953-04-30 1961-05-09 Rca Corp Electronic sound absorber
DE4127473A1 (en) * 1991-08-20 1993-02-25 Guenter Dr Stahr Noise cancellation using electronic signal processing and delay - exploits destructive interference between incoming noise and compensating sound emitted with appropriate delay by directional loudspeaker
WO1994019894A1 (en) * 1993-02-16 1994-09-01 Berger Douglas L Voice transmission systems with voice cancellation

Also Published As

Publication number Publication date
GB9407819D0 (en) 1994-06-15
WO1995029571A2 (en) 1995-11-02

Similar Documents

Publication Publication Date Title
EP0719493B1 (en) Apparatus and method for reducing acoustic feedback
MY122083A (en) Echo canceler for non-linear circuits
AUPO826597A0 (en) Cardiac patient remote monitoring apparatus
AU4403600A (en) Method for the reproduction of sound waves using ultrasound loudspeakers
WO1998026405A3 (en) Directed acoustic stick radiator
AU4590893A (en) Method and device for active noise reduction in a local area
ATE179297T1 (en) PANEL-SHAPED MICROPHONES
IL140655A0 (en) Acoustic device using bending wave modes
MY128422A (en) Active headset
EP0755045A3 (en) Sound wave cancellation arrangement
DE60117779D1 (en) "ACOUSTIC TRANSMISSION CONNECTION, HEADPHONE WITH ACOUSTIC TRANSMISSION CONNECTION AND USE OF THE ACOUSTIC TRANSMISSION CONNECTION"
DE60033826D1 (en) AMPLIFICATION CONTROL OF AUDIO SIGNALS IN A SOUND ENVIRONMENT WITH THE HELP OF A FILTER BANK
MY107470A (en) Wide-band differential amplifier using gm-cancellation
EP0216326A3 (en) Electroacoustic transducer
WO2001063744A3 (en) Phasen- und frequenzmodulator
EP1061770A3 (en) Audio apparatus
WO1995029571A3 (en) Apparatus including a sound transducer
JP2713753B2 (en) Secret talk transmission device
EP0249428A3 (en) Self-powered, portable stereo speaker pillow
KR100626521B1 (en) Sound output apparatus in using hypersonic in a mobile communication terminal
JPS57178499A (en) Hearing aid
KR940007686B1 (en) Multiple sound input treating appartus
JPS6143331Y2 (en)
JPH067705B2 (en) Electrodynamic underwater sound wave transmitter
JP3051663U (en) Skin contact type closed indirect vibration conduction type audio dynamic microphone

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): CN JP KR

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

AK Designated states

Kind code of ref document: A3

Designated state(s): CN JP KR

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase