JPS57162529A - Noise reducing circuit - Google Patents
Noise reducing circuitInfo
- Publication number
- JPS57162529A JPS57162529A JP57040938A JP4093882A JPS57162529A JP S57162529 A JPS57162529 A JP S57162529A JP 57040938 A JP57040938 A JP 57040938A JP 4093882 A JP4093882 A JP 4093882A JP S57162529 A JPS57162529 A JP S57162529A
- Authority
- JP
- Japan
- Prior art keywords
- noise reducing
- reducing circuit
- circuit
- noise
- reducing
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8105410A FR2502370A1 (fr) | 1981-03-18 | 1981-03-18 | Dispositif de reduction du bruit dans un signal de parole mele de bruit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57162529A true JPS57162529A (en) | 1982-10-06 |
Family
ID=9256379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57040938A Pending JPS57162529A (en) | 1981-03-18 | 1982-03-17 | Noise reducing circuit |
Country Status (7)
Country | Link |
---|---|
US (1) | US4433435A ( ) |
JP (1) | JPS57162529A ( ) |
CA (1) | CA1184129A ( ) |
DE (1) | DE3209384A1 ( ) |
FR (1) | FR2502370A1 ( ) |
GB (1) | GB2095956B ( ) |
SE (1) | SE448138B ( ) |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4531523A (en) * | 1984-10-04 | 1985-07-30 | Medtronic, Inc. | Digital gain control for the reception of telemetry signals from implanted medical devices |
US4628529A (en) * | 1985-07-01 | 1986-12-09 | Motorola, Inc. | Noise suppression system |
US4630305A (en) * | 1985-07-01 | 1986-12-16 | Motorola, Inc. | Automatic gain selector for a noise suppression system |
US4630304A (en) * | 1985-07-01 | 1986-12-16 | Motorola, Inc. | Automatic background noise estimator for a noise suppression system |
US4630302A (en) * | 1985-08-02 | 1986-12-16 | Acousis Company | Hearing aid method and apparatus |
US4882749A (en) * | 1986-01-09 | 1989-11-21 | Harris Semiconductor (Patents) Inc. | Control of signal transmission |
DE3629596A1 (de) * | 1986-08-30 | 1988-03-03 | Standard Elektrik Lorenz Ag | Schaltungsanordnung zur entkopplung der uebertragungszweige einer freisprecheinrichtung |
DE3725107A1 (de) * | 1987-07-29 | 1989-02-16 | Messerschmitt Boelkow Blohm | Adaptives, nichtlineares frequenzbereichsfilter mit geringem phasenverlust |
JP2551050B2 (ja) * | 1987-11-13 | 1996-11-06 | ソニー株式会社 | 有音無音判定回路 |
DE69317802T2 (de) * | 1992-01-21 | 1998-10-22 | Koninkl Philips Electronics Nv | Verfahren und Vorrichtung für Tonverbesserung unter Verwendung von Hüllung von multibandpassfiltrierten Signalen in Kammfiltern |
US5412735A (en) * | 1992-02-27 | 1995-05-02 | Central Institute For The Deaf | Adaptive noise reduction circuit for a sound reproduction system |
US5617508A (en) * | 1992-10-05 | 1997-04-01 | Panasonic Technologies Inc. | Speech detection device for the detection of speech end points based on variance of frequency band limited energy |
US5732143A (en) * | 1992-10-29 | 1998-03-24 | Andrea Electronics Corp. | Noise cancellation apparatus |
US5706352A (en) * | 1993-04-07 | 1998-01-06 | K/S Himpp | Adaptive gain and filtering circuit for a sound reproduction system |
US5617472A (en) * | 1993-12-28 | 1997-04-01 | Nec Corporation | Noise suppression of acoustic signal in telephone set |
US5712953A (en) * | 1995-06-28 | 1998-01-27 | Electronic Data Systems Corporation | System and method for classification of audio or audio/video signals based on musical content |
FR2741182B1 (fr) * | 1995-11-13 | 1998-01-02 | Technofirst | Procede et dispositif d'extraction d'un signal acoustique utile a partir d'un signal acoustique composite comprenant des composantes parasites |
US5825754A (en) * | 1995-12-28 | 1998-10-20 | Vtel Corporation | Filter and process for reducing noise in audio signals |
US6188986B1 (en) * | 1998-01-02 | 2001-02-13 | Vos Systems, Inc. | Voice activated switch method and apparatus |
US6480823B1 (en) | 1998-03-24 | 2002-11-12 | Matsushita Electric Industrial Co., Ltd. | Speech detection for noisy conditions |
US6363345B1 (en) | 1999-02-18 | 2002-03-26 | Andrea Electronics Corporation | System, method and apparatus for cancelling noise |
US6594367B1 (en) | 1999-10-25 | 2003-07-15 | Andrea Electronics Corporation | Super directional beamforming design and implementation |
US6594630B1 (en) | 1999-11-19 | 2003-07-15 | Voice Signal Technologies, Inc. | Voice-activated control for electrical device |
WO2004097799A1 (en) * | 2003-04-24 | 2004-11-11 | Massachusetts Institute Of Technology | System and method for spectral enhancement employing compression and expansion |
US20050213745A1 (en) * | 2004-02-27 | 2005-09-29 | Acoustic Technologies, Inc. | Voice activity detector for low S/N |
KR100644717B1 (ko) * | 2005-12-22 | 2006-11-10 | 삼성전자주식회사 | 다채널 오디오 신호 생성 장치 및 그 방법 |
KR100750148B1 (ko) * | 2005-12-22 | 2007-08-17 | 삼성전자주식회사 | 음성신호 제거 장치 및 그 방법 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5640403B1 ( ) * | 1971-02-10 | 1981-09-21 | ||
FR2233770A1 (en) * | 1973-06-12 | 1975-01-10 | Charbonnages De France | Protection of communication circuit - is for use with microphone and comprises two diodes mounted in series with microphone |
DE2432371A1 (de) * | 1973-07-06 | 1975-02-27 | Secr Defence Brit | Sprachsignal-verarbeitungsanordnung |
US4143325A (en) * | 1976-08-20 | 1979-03-06 | Kahn Leonard R | Constant amplitude interference squelch system |
FR2410923A1 (fr) * | 1977-08-18 | 1979-06-29 | Dassault Electronique | Installation de transmission telephonique de la parole entre des interlocuteurs places dans une ambiance bruyante |
NL7901477A (nl) * | 1979-02-26 | 1980-08-28 | Philips Nv | Geluidsweergave in een ruimte met een onafhankelijke geluidsbron. |
-
1981
- 1981-03-18 FR FR8105410A patent/FR2502370A1/fr active Granted
-
1982
- 1982-02-25 US US06/352,500 patent/US4433435A/en not_active Expired - Fee Related
- 1982-03-11 CA CA000398087A patent/CA1184129A/en not_active Expired
- 1982-03-15 GB GB8207458A patent/GB2095956B/en not_active Expired
- 1982-03-15 DE DE19823209384 patent/DE3209384A1/de not_active Withdrawn
- 1982-03-15 SE SE8201598A patent/SE448138B/sv not_active IP Right Cessation
- 1982-03-17 JP JP57040938A patent/JPS57162529A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
US4433435A (en) | 1984-02-21 |
FR2502370B1 ( ) | 1985-05-17 |
SE448138B (sv) | 1987-01-19 |
GB2095956A (en) | 1982-10-06 |
SE8201598L (sv) | 1982-09-19 |
FR2502370A1 (fr) | 1982-09-24 |
GB2095956B (en) | 1985-01-23 |
CA1184129A (en) | 1985-03-19 |
DE3209384A1 (de) | 1982-11-04 |
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