FR2676876B1 - Emetteur-recepteur de telecommunications avec augmentation de l'affaiblissement de l'echo. - Google Patents

Emetteur-recepteur de telecommunications avec augmentation de l'affaiblissement de l'echo.

Info

Publication number
FR2676876B1
FR2676876B1 FR9206377A FR9206377A FR2676876B1 FR 2676876 B1 FR2676876 B1 FR 2676876B1 FR 9206377 A FR9206377 A FR 9206377A FR 9206377 A FR9206377 A FR 9206377A FR 2676876 B1 FR2676876 B1 FR 2676876B1
Authority
FR
France
Prior art keywords
weakening
telecommunication transceiver
increased echo
echo
increased
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.)
Expired - Fee Related
Application number
FR9206377A
Other languages
English (en)
Other versions
FR2676876A1 (fr
Inventor
Jensen Peter Kabell
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of FR2676876A1 publication Critical patent/FR2676876A1/fr
Application granted granted Critical
Publication of FR2676876B1 publication Critical patent/FR2676876B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/012—Comfort noise or silence coding
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
    • H04J3/1688—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers the demands of the users being taken into account after redundancy removal, e.g. by predictive coding, by variable sampling
    • 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
    • H04M9/085—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using digital techniques

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computational Linguistics (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
FR9206377A 1991-05-25 1992-05-25 Emetteur-recepteur de telecommunications avec augmentation de l'affaiblissement de l'echo. Expired - Fee Related FR2676876B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9111380A GB2256351B (en) 1991-05-25 1991-05-25 Enhancement of echo return loss

Publications (2)

Publication Number Publication Date
FR2676876A1 FR2676876A1 (fr) 1992-11-27
FR2676876B1 true FR2676876B1 (fr) 1995-06-30

Family

ID=10695645

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9206377A Expired - Fee Related FR2676876B1 (fr) 1991-05-25 1992-05-25 Emetteur-recepteur de telecommunications avec augmentation de l'affaiblissement de l'echo.

Country Status (4)

Country Link
DE (1) DE4216911A1 (fr)
FR (1) FR2676876B1 (fr)
GB (1) GB2256351B (fr)
HK (1) HK1000618A1 (fr)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2281680B (en) * 1993-08-27 1998-08-26 Motorola Inc A voice activity detector for an echo suppressor and an echo suppressor
JP3182032B2 (ja) * 1993-12-10 2001-07-03 株式会社日立国際電気 音声符号化通信方式及びその装置
US5657422A (en) * 1994-01-28 1997-08-12 Lucent Technologies Inc. Voice activity detection driven noise remediator
GB2288102B (en) * 1994-03-23 1997-10-08 Motorola Ltd Mobile radio with transmit command control and mobile radio system
JP3090842B2 (ja) * 1994-04-28 2000-09-25 沖電気工業株式会社 ビタビ復号法に適応した送信装置
DE4416407C2 (de) * 1994-05-09 1997-05-28 Siemens Ag Verfahren und Anordnung zum Übertragen von Sprach- und Steuersignalen in einem digitalen Funksystem
US5835851A (en) * 1995-01-19 1998-11-10 Ericsson Inc. Method and apparatus for echo reduction in a hands-free cellular radio using added noise frames
SE9500858L (sv) * 1995-03-10 1996-09-11 Ericsson Telefon Ab L M Anordning och förfarande vid talöverföring och ett telekommunikationssystem omfattande dylik anordning
FI110826B (fi) * 1995-06-08 2003-03-31 Nokia Corp Akustisen kaiun poisto digitaalisessa matkaviestinjärjestelmässä
FI105001B (fi) * 1995-06-30 2000-05-15 Nokia Mobile Phones Ltd Menetelmä odotusajan selvittämiseksi puhedekooderissa epäjatkuvassa lähetyksessä ja puhedekooderi sekä lähetin-vastaanotin
FI961568A (fi) * 1996-04-10 1997-10-11 Nokia Telecommunications Oy Epäjatkuva lähetys analogisessa matkaviestinjärjestelmässä
US5771440A (en) * 1996-05-31 1998-06-23 Motorola, Inc. Communication device with dynamic echo suppression and background noise estimation
SE507370C2 (sv) * 1996-09-13 1998-05-18 Ericsson Telefon Ab L M Metod och anordning för att alstra komfortbrus i linjärprediktiv talavkodare
US5954834A (en) * 1996-10-09 1999-09-21 Ericsson Inc. Systems and methods for communicating desired audio information over a communications medium
US6011846A (en) * 1996-12-19 2000-01-04 Nortel Networks Corporation Methods and apparatus for echo suppression
US5978366A (en) * 1996-12-20 1999-11-02 Ericsson Inc. Methods and systems for reduced power operation of cellular mobile terminals
US5737695A (en) * 1996-12-21 1998-04-07 Telefonaktiebolaget Lm Ericsson Method and apparatus for controlling the use of discontinuous transmission in a cellular telephone
US5982755A (en) * 1997-03-06 1999-11-09 Nortel Networks Corporation System and method for providing high terminal coupling loss in a handsfree terminal
SE511650C2 (sv) * 1997-03-11 1999-11-01 Ericsson Telefon Ab L M Förfarande och anordning för att reducera eko i en telefontillämpning
US6064873A (en) * 1997-03-26 2000-05-16 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for controlling echo on both sides of a connection
WO1998059431A1 (fr) * 1997-06-24 1998-12-30 Northern Telecom Limited Procedes et appareil de suppression d'echos
US6347081B1 (en) 1997-08-25 2002-02-12 Telefonaktiebolaget L M Ericsson (Publ) Method for power reduced transmission of speech inactivity
US6163608A (en) * 1998-01-09 2000-12-19 Ericsson Inc. Methods and apparatus for providing comfort noise in communications systems
US6182035B1 (en) * 1998-03-26 2001-01-30 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for detecting voice activity
FR2786636B1 (fr) 1998-11-26 2001-05-04 Cit Alcatel Procede de reception de signaux, notamment de signaux de signalisation
US6480472B1 (en) 1999-07-21 2002-11-12 Qualcomm Incorporated Mobile station supervision of the forward dedicated control channel when in the discontinuous transmission mode
WO2001033814A1 (fr) * 1999-11-03 2001-05-10 Tellabs Operations, Inc. Systeme de traitement vocal integre pour reseaux a commutation par paquets
GB0024485D0 (en) 2000-10-06 2000-11-22 Wheelsure Ltd Wheel nut assembly
GB2381702B (en) * 2001-11-02 2004-01-07 Motorola Inc Communication system, user equipment and method of performing a conference call therefor
EP1432222A1 (fr) * 2002-12-20 2004-06-23 Siemens Aktiengesellschaft Annuleur d'écho pour signaux vocaux comprimés

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942116A (en) * 1975-03-13 1976-03-02 California Microwave, Inc. Transceiver having improved voice actuated carrier and echo suppression circuit
US3991287A (en) * 1975-04-24 1976-11-09 Bell Telephone Laboratories, Incorporated Digital echo suppressor noise insertion
US4277645A (en) * 1980-01-25 1981-07-07 Bell Telephone Laboratories, Incorporated Multiple variable threshold speech detector
WO1982003144A1 (fr) * 1981-03-05 1982-09-16 Western Electric Co Discriminateur de bandes d'energie
GB2172475B (en) * 1985-03-13 1988-09-01 Stc Plc Packet switching system
JPH07123235B2 (ja) * 1986-08-13 1995-12-25 株式会社日立製作所 エコ−サプレツサ

Also Published As

Publication number Publication date
GB2256351A (en) 1992-12-02
GB9111380D0 (en) 1991-07-17
HK1000618A1 (en) 1998-04-09
FR2676876A1 (fr) 1992-11-27
GB2256351B (en) 1995-07-05
DE4216911A1 (de) 1992-11-26

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Legal Events

Date Code Title Description
ST Notification of lapse