WO1994019894A1 - Voice transmission systems with voice cancellation - Google Patents
Voice transmission systems with voice cancellation Download PDFInfo
- Publication number
- WO1994019894A1 WO1994019894A1 PCT/US1994/001554 US9401554W WO9419894A1 WO 1994019894 A1 WO1994019894 A1 WO 1994019894A1 US 9401554 W US9401554 W US 9401554W WO 9419894 A1 WO9419894 A1 WO 9419894A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voice
- signal
- user
- cancellation
- speaker
- Prior art date
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
Definitions
- This invention relates to voice transmission systems equipped with means for active sound cancellation, so that a person's voice cannot be overheard as he or she speaks into a transmitter or microphone, such as the mouthpiece of a telephone.
- the basic components of an antinoise system include a microphone or transducer to monitor the noise source, and a signal processor to receive the noise signal and generate an antinoise signal having a mirror-image waveform. The antinoise signal is then passed to one or more speakers or transducers for generating the acoustic wave used to cancel the noise.
- a synchronizing input which generates and feeds a correction signal to the processor and an adaptor for constantly changing the cancellation signal to match a constantly changing noise signal.
- the entire history of active sound cancellation has been directed to noise control, and to the filtering of unwanted sound from speech transmission.
- the radio for example, the radio
- a voice transmission system is provided with active sound cancellation means, for silencing the sound of user's voice immediately after the voice transmitter of the system converts the acoustical voice wave to an electronic signal.
- active sound cancellation means for silencing the sound of user's voice immediately after the voice transmitter of the system converts the acoustical voice wave to an electronic signal.
- noise control is not the real object of the invention.
- This concept differs sharply from noise cancellation in that a single user's voice is not noise, the user's entire acoustical voice wave is cancelled; but not until the voice wave has reached the microphone, or the telephone mouthpiece and is converted therein to an electronic signal for transmission to a remote listener.
- the timing of the cancellation must be just after the electronic voice signal is generated.
- the electronic voice signal is then divided for simultaneous transmission to a remote listener, and also to a data processor for the synthesis of a cancellation waveform. Since electronic signals travel nearly a million times faster than acoustic waves in air, the cancellation waveform can be generated and fed to an electro- acoustic transducer/speaker near the user's mouth for acoustical cancellation of the voice wave before it travels an inch beyond the telephone mouthpiece.
- One embodiment of the invention comprises a microphone or other voice transmitter in combination with active sound cancellation means for attenuating or silencing a user's voice immediately after it is converted to an electronic signal.
- Another embodiment comprises a telephone or radio system having a transmitter or microphone and a receiver, in combination with active sound cancellation means for acoustically attenuating or cancelling a user's voice just after it is converted to an electronic waveform by the microphone.
- the sound cancellation means includes a circuit for dividing the electronic signal, such that it can be transmitted to a remote receiver and simultaneously processed for the synthesis of a voice cancellation waveform.
- the synthetic waveform is then passed to a transducer or speaker near the microphone for the generation of an acoustic wave to cancel or attenuate the user's voice.
- Figure 1 is a pictorial view of a telephone system illustrating one embodiment of the invention.
- Figure 2 is a functional block diagram of the system of Figure 1.
- FIG. 3 is a block diagram of the signal processor and adaptor of Figure 2.
- Figure 4 is a pictorial view of a telephone system illustrating a second embodiment of the invention.
- Figure 5 is a pictorial view of a portable attachment for an existing telephone system, illustrating a third embodiment of the invention. e a e
- S h own in Figure 1 is a telephone system including hand set 11 h aving an earpiece 12, a microphone 13, and one or more voice cancellation speakers 14.
- the cancellation speakers must be located at a distance from the user's mount which exceeds the distance between the user's mouth and the transducer within the microphone. For example, the cancellation speakers are located about 1 to 6 inches from the mouthpiece transducer.
- the electronic waveform generated by the microphone is then passed through cord 15 to base set 16 where it is divided for transmission to a remote receiver and for simultaneous processing by computer 17, which also receives a correcting signal from microphone 18.
- the synthetic waveform generated by the computer is then passed through a separate line in cord 15 back to speakers 14 for acoustic cancellation of the user's voice.
- Figure 2 the system of Figure 1 is diagrammed to show that the user's voice enters mouthpiece 13, and the resulting signal is divided into path 21 for remote transmission 22 and path 23 for computer processing by systems 19 and 20 to produce cancellation waveform 24 for activation of speakers 14.
- Correcting microphone 18 provides an input to system 19 for adaptive correction of waveform 24.
- the telephone system of Figure 4 includes handpiece 31 having an earpiece 32 and a mouthpiece that includes microphone 33 for normal usage, and an additional microphone 34 used only for voice cancellation.
- the electrical voice signal from microphone 33 is passed through cord 35, base set 38, and to a remote receiver, as in normal telephone usage.
- the extra microphone 34 generates a separate, identical electrical signal for processing by computer circuitry 36, located in the handpiece.
- signal processor 36 generates an active voice cancellation signal, which is passed to one or more speakers 37 for generation of the acoustic wave that cancels the user's voice.
- the portable device of Figure 5 includes case 41 having a clip or band 42 for temporary attachment of the device to an ordinary telephone.
- Microphone 43 is mounted within the case, along with voice cancellation circuitry 44, power supply 45, and one or more voice cancellation speakers 46.
- This device permits the user to "instantly" convert any telephone system to one that includes voice cancellation in accordance with the concept of the present invention.
- an electrical voice signal from microphone 43 is converted by processor 44 to a mirror-image waveform passed to speaker 46 for use in generating cancellation acoustics.
- the system of the invention provides the capability of engaging in private conversations by telephone, even when surrounded by people who would otherwise hear every word spoken by the user. This will allow the user to concentrate more fully, and to speak more freely regarding secret information. No training or special effort is needed, since the system works without intervention by the user.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU62393/94A AU6239394A (en) | 1993-02-16 | 1994-02-10 | Voice transmission systems with voice cancellation |
EP94909610A EP0685133A4 (en) | 1993-02-16 | 1994-02-10 | Voice transmission systems with voice cancellation. |
JP6519051A JPH09503889A (en) | 1993-02-16 | 1994-02-10 | Voice canceling transmission system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/018,277 | 1993-02-16 | ||
US08/018,277 US5526421A (en) | 1993-02-16 | 1993-02-16 | Voice transmission systems with voice cancellation |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994019894A1 true WO1994019894A1 (en) | 1994-09-01 |
Family
ID=21787127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/001554 WO1994019894A1 (en) | 1993-02-16 | 1994-02-10 | Voice transmission systems with voice cancellation |
Country Status (5)
Country | Link |
---|---|
US (1) | US5526421A (en) |
EP (1) | EP0685133A4 (en) |
JP (1) | JPH09503889A (en) |
AU (1) | AU6239394A (en) |
WO (1) | WO1994019894A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995029571A2 (en) * | 1994-04-20 | 1995-11-02 | Philips Electronics N.V. | Apparatus including a sound transducer |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6850252B1 (en) | 1999-10-05 | 2005-02-01 | Steven M. Hoffberg | Intelligent electronic appliance system and method |
US5625684A (en) * | 1993-02-04 | 1997-04-29 | Local Silence, Inc. | Active noise suppression system for telephone handsets and method |
US6151397A (en) * | 1997-05-16 | 2000-11-21 | Motorola, Inc. | Method and system for reducing undesired signals in a communication environment |
WO2001052400A1 (en) * | 2000-01-07 | 2001-07-19 | Arthur D. Little Enterprises, Inc. | Mechanical-to-acoustical transformer and multi-media flat film speaker |
US7088828B1 (en) * | 2000-04-13 | 2006-08-08 | Cisco Technology, Inc. | Methods and apparatus for providing privacy for a user of an audio electronic device |
FR2819362A1 (en) * | 2001-01-05 | 2002-07-12 | Rene Travere | ATTENUATOR, INTERFERENCE, CONVERSATION APPLIED TO THE TELEPHONE |
US6952474B2 (en) * | 2001-03-15 | 2005-10-04 | Wittke Edward R | Phone privacy and unobtrusiveness via voice cancellation |
US20040192243A1 (en) * | 2003-03-28 | 2004-09-30 | Siegel Jaime A. | Method and apparatus for reducing noise from a mobile telephone and for protecting the privacy of a mobile telephone user |
US20050065778A1 (en) * | 2003-09-24 | 2005-03-24 | Mastrianni Steven J. | Secure speech |
EP1886362A2 (en) * | 2005-05-31 | 2008-02-13 | Unison Products | Diaphragm membrane and supporting structure responsive to environmental conditions |
US8194871B2 (en) * | 2007-08-31 | 2012-06-05 | Centurylink Intellectual Property Llc | System and method for call privacy |
US8538492B2 (en) * | 2007-08-31 | 2013-09-17 | Centurylink Intellectual Property Llc | System and method for localized noise cancellation |
WO2009067669A1 (en) * | 2007-11-21 | 2009-05-28 | Emo Labs, Inc.. | Wireless loudspeaker |
US8300801B2 (en) * | 2008-06-26 | 2012-10-30 | Centurylink Intellectual Property Llc | System and method for telephone based noise cancellation |
US9020158B2 (en) * | 2008-11-20 | 2015-04-28 | Harman International Industries, Incorporated | Quiet zone control system |
US8135140B2 (en) | 2008-11-20 | 2012-03-13 | Harman International Industries, Incorporated | System for active noise control with audio signal compensation |
US8718289B2 (en) * | 2009-01-12 | 2014-05-06 | Harman International Industries, Incorporated | System for active noise control with parallel adaptive filter configuration |
US8189851B2 (en) | 2009-03-06 | 2012-05-29 | Emo Labs, Inc. | Optically clear diaphragm for an acoustic transducer and method for making same |
US8189799B2 (en) * | 2009-04-09 | 2012-05-29 | Harman International Industries, Incorporated | System for active noise control based on audio system output |
US8199924B2 (en) * | 2009-04-17 | 2012-06-12 | Harman International Industries, Incorporated | System for active noise control with an infinite impulse response filter |
US8077873B2 (en) * | 2009-05-14 | 2011-12-13 | Harman International Industries, Incorporated | System for active noise control with adaptive speaker selection |
WO2011020100A1 (en) * | 2009-08-14 | 2011-02-17 | Emo Labs, Inc | System to generate electrical signals for a loudspeaker |
US20110105034A1 (en) * | 2009-11-03 | 2011-05-05 | Senders John W | Active voice cancellation system |
US8670986B2 (en) | 2012-10-04 | 2014-03-11 | Medical Privacy Solutions, Llc | Method and apparatus for masking speech in a private environment |
JP2016516358A (en) | 2013-03-15 | 2016-06-02 | イモ ラブス, インコーポレイテッド | Acoustic transducer having a bending limiting member |
USD733678S1 (en) | 2013-12-27 | 2015-07-07 | Emo Labs, Inc. | Audio speaker |
USD741835S1 (en) | 2013-12-27 | 2015-10-27 | Emo Labs, Inc. | Speaker |
USD748072S1 (en) | 2014-03-14 | 2016-01-26 | Emo Labs, Inc. | Sound bar audio speaker |
CN105763697A (en) * | 2014-12-19 | 2016-07-13 | 武君 | Active sound-cancelling and muting call communication device |
US11348566B1 (en) * | 2019-11-05 | 2022-05-31 | United Services Automobile Association (Usaa) | Voice canceling headset system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4815139A (en) * | 1988-03-16 | 1989-03-21 | Nelson Industries, Inc. | Active acoustic attenuation system for higher order mode non-uniform sound field in a duct |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA824145B (en) * | 1981-06-12 | 1983-04-27 | Sound Attenuators Ltd | Method and apparatus for reducing repetitive noise entering the ear |
CA1293693C (en) * | 1985-10-30 | 1991-12-31 | Tetsu Taguchi | Noise canceling apparatus |
GB8603678D0 (en) * | 1986-02-14 | 1986-03-19 | Gen Electric Co Plc | Active noise control |
GB2200814B (en) * | 1987-01-29 | 1990-02-28 | Crystalate Electronics | Microphone |
JPH0353698A (en) * | 1989-07-21 | 1991-03-07 | Hitachi Ltd | Active silencer |
US5033082A (en) * | 1989-07-31 | 1991-07-16 | Nelson Industries, Inc. | Communication system with active noise cancellation |
US5182774A (en) * | 1990-07-20 | 1993-01-26 | Telex Communications, Inc. | Noise cancellation headset |
US5216721A (en) * | 1991-04-25 | 1993-06-01 | Nelson Industries, Inc. | Multi-channel active acoustic attenuation system |
JP3377220B2 (en) * | 1991-07-03 | 2003-02-17 | 本田技研工業株式会社 | Speech privacy protection device |
-
1993
- 1993-02-16 US US08/018,277 patent/US5526421A/en not_active Expired - Fee Related
-
1994
- 1994-02-10 EP EP94909610A patent/EP0685133A4/en not_active Withdrawn
- 1994-02-10 AU AU62393/94A patent/AU6239394A/en not_active Abandoned
- 1994-02-10 JP JP6519051A patent/JPH09503889A/en active Pending
- 1994-02-10 WO PCT/US1994/001554 patent/WO1994019894A1/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4815139A (en) * | 1988-03-16 | 1989-03-21 | Nelson Industries, Inc. | Active acoustic attenuation system for higher order mode non-uniform sound field in a duct |
Non-Patent Citations (1)
Title |
---|
See also references of EP0685133A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995029571A2 (en) * | 1994-04-20 | 1995-11-02 | Philips Electronics N.V. | Apparatus including a sound transducer |
WO1995029571A3 (en) * | 1994-04-20 | 1995-11-16 | Philips Electronics Nv | Apparatus including a sound transducer |
Also Published As
Publication number | Publication date |
---|---|
AU6239394A (en) | 1994-09-14 |
US5526421A (en) | 1996-06-11 |
EP0685133A1 (en) | 1995-12-06 |
JPH09503889A (en) | 1997-04-15 |
EP0685133A4 (en) | 1997-05-28 |
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