FR2354666A1 - Suppresseur d'echos logarithmique - Google Patents

Suppresseur d'echos logarithmique

Info

Publication number
FR2354666A1
FR2354666A1 FR7717838A FR7717838A FR2354666A1 FR 2354666 A1 FR2354666 A1 FR 2354666A1 FR 7717838 A FR7717838 A FR 7717838A FR 7717838 A FR7717838 A FR 7717838A FR 2354666 A1 FR2354666 A1 FR 2354666A1
Authority
FR
France
Prior art keywords
logarithmic
echo suppressor
analog signal
circuits
products
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.)
Granted
Application number
FR7717838A
Other languages
English (en)
Other versions
FR2354666B1 (fr
Inventor
Otakar Anthony Horna
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Comsat Corp
Original Assignee
Comsat Corp
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 Comsat Corp filed Critical Comsat Corp
Publication of FR2354666A1 publication Critical patent/FR2354666A1/fr
Application granted granted Critical
Publication of FR2354666B1 publication Critical patent/FR2354666B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

Suppresseur d'échos logarithmique. Il est caractérisé en ce que les éthantillons de signaux et des coefficients mémorisés dans des registres sont codés dans un format logarithmique avec un signe, un expoant et une mantisse, des moyens de convolution numérique étant prévus qui comprennent des moyens pour multiplier, des moyens pour accumuler les produits engendrés et pour convertir la valeur des produits accumulés en un signal analogique représentant un signal d'écho approximatif, ledit signal analogique étant soustrait par voie analogique dans des moyens appropriés. Application aux circuits téléphoniques à longue distance et plus particulièrement la suppression des échos parasites dans ces circuits.
FR7717838A 1976-06-11 1977-06-10 Suppresseur d'echos logarithmique Granted FR2354666A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/694,878 US4064379A (en) 1976-06-11 1976-06-11 Logarithmic echo canceller

Publications (2)

Publication Number Publication Date
FR2354666A1 true FR2354666A1 (fr) 1978-01-06
FR2354666B1 FR2354666B1 (fr) 1984-06-08

Family

ID=24790628

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7717838A Granted FR2354666A1 (fr) 1976-06-11 1977-06-10 Suppresseur d'echos logarithmique

Country Status (10)

Country Link
US (1) US4064379A (fr)
JP (1) JPS52153315A (fr)
AU (1) AU498268B2 (fr)
BR (1) BR7702093A (fr)
CA (1) CA1081380A (fr)
DE (1) DE2713478A1 (fr)
FR (1) FR2354666A1 (fr)
GB (2) GB1563742A (fr)
IT (1) IT1082391B (fr)
SE (1) SE418037B (fr)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113997A (en) * 1977-07-12 1978-09-12 Communications Satellite, Corporation Analog to digital signal of logarithmic format converter and analog to pseudo-rms value converter and echo canceller utilizing same
FR2451676A1 (fr) * 1979-03-12 1980-10-10 Soumagne Joel Detecteur d'echo notamment pour systeme de communication a interpolation de parole
US4283770A (en) * 1979-10-09 1981-08-11 Tellabs, Inc. Signal processor for digital echo canceller
JPS6046899B2 (ja) * 1980-09-26 1985-10-18 日本電気株式会社 反響消去装置
FR2496364A1 (fr) * 1980-12-17 1982-06-18 Trt Telecom Radio Electr Annuleur d'echo pour transmission telephonique par voies numeriques mettant en oeuvre une loi de codage pseudo-logarithmique
JPS57140040A (en) * 1981-02-24 1982-08-30 Nec Corp Echo canceller
US4602133A (en) * 1982-07-23 1986-07-22 Gte Lenkurt Incorporated Adaptive echo cancelling system and method utilizing linear code spacing
JPS5961233A (ja) * 1982-09-29 1984-04-07 Nec Corp 適応型反響消去装置
JPS59151546A (ja) * 1983-02-18 1984-08-30 Nec Corp 適応形反響消去装置
US4542265A (en) * 1983-05-20 1985-09-17 Gte Lenkurt Incorporated Echo canceller dynamic range extension
FR2564667B1 (fr) * 1984-05-15 1986-09-19 Trt Telecom Radio Electr Dispositif de commande d'un annuleur d'echo et d'un ecreteur de centre
US4628157A (en) * 1984-09-07 1986-12-09 At&T Bell Laboratories Bidirectional adaptive voice frequency repeater
US4584441A (en) * 1984-09-07 1986-04-22 At&T Bell Laboratories Bidirectional adaptive voice frequency repeater
NZ214905A (en) * 1985-01-29 1988-09-29 British Telecomm Noise cancellation by adaptive filter compensates for timing variations
US4811342A (en) * 1985-11-12 1989-03-07 Racal Data Communications Inc. High speed analog echo canceller
GB8625282D0 (en) * 1986-10-22 1986-11-26 British Telecomm Detecting faults in transmission lines
AU608822B2 (en) * 1987-06-29 1991-04-18 Digital Equipment Corporation Bus transmitter having controlled trapezoidal slew rate
JPH0195609A (ja) * 1987-10-08 1989-04-13 Oki Electric Ind Co Ltd 全二重モデム
US4866647A (en) * 1988-02-04 1989-09-12 American Telephone And Telegraph Company Continuously variable digital delay circuit
JPH01132832U (fr) * 1988-02-29 1989-09-08
US4977591A (en) * 1989-11-17 1990-12-11 Nynex Corporation Dual mode LMS nonlinear data echo canceller
US5157653A (en) * 1990-08-03 1992-10-20 Coherent Communications Systems Corp. Residual echo elimination with proportionate noise injection
US5477535A (en) * 1991-11-04 1995-12-19 Nokia Telecommunications Oy Method of preventing a divergence of an adaptive echo canceller in a noisy signal environment
US5357609A (en) * 1992-03-25 1994-10-18 One Touch Systems, Inc. Site controller with echo suppression
DE4236272A1 (de) * 1992-10-27 1994-04-28 Siemens Ag Echokompensationsvorrichtung und 4/2-Drahtschnittstelle mit einer solchen Echokompensationsvorrichtung
JPH06232957A (ja) * 1993-01-29 1994-08-19 Toshiba Corp 音声通信装置
US6028929A (en) * 1997-11-14 2000-02-22 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved non-linear echo path detection
US6424635B1 (en) * 1998-11-10 2002-07-23 Nortel Networks Limited Adaptive nonlinear processor for echo cancellation
US6693967B1 (en) * 2000-03-16 2004-02-17 Agere Systems Inc. Detecting encoding and encoding conversion for modem connections
US7065207B2 (en) * 2003-09-11 2006-06-20 Freescale Semiconductor, Inc. Controlling attenuation during echo suppression
DE102013202140A1 (de) * 2013-02-08 2014-08-14 Robert Bosch Gmbh Verfahren und Vorrichtung zur Überprüfung eines digitalen Multiplizierers
CN109831733B (zh) * 2019-02-26 2020-11-24 北京百度网讯科技有限公司 音频播放性能的测试方法、装置、设备和存储介质
CN114303188A (zh) * 2019-08-30 2022-04-08 杜比实验室特许公司 针对机器感知预调节音频

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894200A (en) * 1973-10-10 1975-07-08 Communications Satellite Corp Adaptive echo canceller with digital center clipping

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2334546C2 (de) * 1973-07-06 1982-05-27 Siemens AG, 1000 Berlin und 8000 München Echokompensator
US3905028A (en) * 1973-08-02 1975-09-09 North Electric Co Direct digital logarithmic encoder
US3877026A (en) * 1973-10-01 1975-04-08 North Electric Co Direct digital logarithmic decoder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894200A (en) * 1973-10-10 1975-07-08 Communications Satellite Corp Adaptive echo canceller with digital center clipping

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/72 *

Also Published As

Publication number Publication date
CA1081380A (fr) 1980-07-08
SE418037B (sv) 1981-04-27
DE2713478C2 (fr) 1988-08-11
GB1563742A (en) 1980-03-26
US4064379A (en) 1977-12-20
AU2388177A (en) 1978-10-05
SE7706422L (sv) 1977-12-11
AU498268B2 (en) 1979-02-22
IT1082391B (it) 1985-05-21
JPS52153315A (en) 1977-12-20
JPS6251010B2 (fr) 1987-10-28
BR7702093A (pt) 1978-02-28
DE2713478A1 (de) 1977-12-29
FR2354666B1 (fr) 1984-06-08
GB1563743A (en) 1980-03-26

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Legal Events

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ST Notification of lapse