GB2256351B - Enhancement of echo return loss - Google Patents

Enhancement of echo return loss

Info

Publication number
GB2256351B
GB2256351B GB9111380A GB9111380A GB2256351B GB 2256351 B GB2256351 B GB 2256351B GB 9111380 A GB9111380 A GB 9111380A GB 9111380 A GB9111380 A GB 9111380A GB 2256351 B GB2256351 B GB 2256351B
Authority
GB
United Kingdom
Prior art keywords
enhancement
return loss
echo return
echo
loss
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
GB9111380A
Other versions
GB9111380D0 (en
GB2256351A (en
Inventor
Peter Kabell Jensen
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
Priority to GB9111380A priority Critical patent/GB2256351B/en
Publication of GB9111380D0 publication Critical patent/GB9111380D0/en
Priority to DE19924216911 priority patent/DE4216911A1/en
Priority to FR9206377A priority patent/FR2676876B1/en
Publication of GB2256351A publication Critical patent/GB2256351A/en
Application granted granted Critical
Publication of GB2256351B publication Critical patent/GB2256351B/en
Priority to HK97102196A priority patent/HK1000618A1/en
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)
GB9111380A 1991-05-25 1991-05-25 Enhancement of echo return loss Expired - Fee Related GB2256351B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB9111380A GB2256351B (en) 1991-05-25 1991-05-25 Enhancement of echo return loss
DE19924216911 DE4216911A1 (en) 1991-05-25 1992-05-21 IMPROVEMENT IN LOSS OF ECHO RETURN
FR9206377A FR2676876B1 (en) 1991-05-25 1992-05-25 TELECOMMUNICATION TRANSCEIVER WITH INCREASED ECHO WEAKENING.
HK97102196A HK1000618A1 (en) 1991-05-25 1997-11-19 Enhancement of echo return loss

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 (3)

Publication Number Publication Date
GB9111380D0 GB9111380D0 (en) 1991-07-17
GB2256351A GB2256351A (en) 1992-12-02
GB2256351B true GB2256351B (en) 1995-07-05

Family

ID=10695645

Family Applications (1)

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

Country Status (4)

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

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 (en) * 1993-12-10 2001-07-03 株式会社日立国際電気 Voice coded communication system and apparatus therefor
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 (en) * 1994-04-28 2000-09-25 沖電気工業株式会社 Transmitter adapted to Viterbi decoding method
DE4416407C2 (en) * 1994-05-09 1997-05-28 Siemens Ag Method and arrangement for transmitting voice and control signals in a digital radio system
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 (en) * 1995-03-10 1996-09-11 Ericsson Telefon Ab L M Device and method of voice transmission and a telecommunication system comprising such device
FI110826B (en) * 1995-06-08 2003-03-31 Nokia Corp Eliminating an acoustic echo in a digital mobile communication system
FI105001B (en) * 1995-06-30 2000-05-15 Nokia Mobile Phones Ltd Method for Determining Wait Time in Speech Decoder in Continuous Transmission and Speech Decoder and Transceiver
FI961568A (en) * 1996-04-10 1997-10-11 Nokia Telecommunications Oy Discontinuous transmission in an analog mobile communication system
US5771440A (en) * 1996-05-31 1998-06-23 Motorola, Inc. Communication device with dynamic echo suppression and background noise estimation
SE507370C2 (en) * 1996-09-13 1998-05-18 Ericsson Telefon Ab L M Method and apparatus for generating comfort noise in linear predictive speech decoders
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 (en) * 1997-03-11 1999-11-01 Ericsson Telefon Ab L M Method and apparatus for reducing echo in a telephone application
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 (en) * 1997-06-24 1998-12-30 Northern Telecom Limited Methods and apparatus for echo suppression
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 (en) 1998-11-26 2001-05-04 Cit Alcatel METHOD FOR RECEIVING SIGNALS, IN PARTICULAR SIGNAL SIGNALS
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
US6522746B1 (en) * 1999-11-03 2003-02-18 Tellabs Operations, Inc. Synchronization of voice boundaries and their use by echo cancellers in a voice processing system
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
US20060160581A1 (en) * 2002-12-20 2006-07-20 Christopher Beaugeant Echo suppression for compressed speech with only partial transcoding of the uplink user data stream

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2068698A (en) * 1980-01-25 1981-08-12 Western Electric Co Speech detector
GB2095519A (en) * 1981-03-05 1982-09-29 Western Electric Co Energy band discriminator
US4864608A (en) * 1986-08-13 1989-09-05 Hitachi, Ltd. Echo suppressor

Family Cites Families (3)

* 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
GB2172475B (en) * 1985-03-13 1988-09-01 Stc Plc Packet switching system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2068698A (en) * 1980-01-25 1981-08-12 Western Electric Co Speech detector
GB2095519A (en) * 1981-03-05 1982-09-29 Western Electric Co Energy band discriminator
US4864608A (en) * 1986-08-13 1989-09-05 Hitachi, Ltd. Echo suppressor

Also Published As

Publication number Publication date
HK1000618A1 (en) 1998-04-09
DE4216911A1 (en) 1992-11-26
GB9111380D0 (en) 1991-07-17
GB2256351A (en) 1992-12-02
FR2676876B1 (en) 1995-06-30
FR2676876A1 (en) 1992-11-27

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20020525