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SE9700873L - Simple voice telephone - Google Patents

Simple voice telephone

Info

Publication number
SE9700873L
SE9700873L SE9700873A SE9700873A SE9700873L SE 9700873 L SE9700873 L SE 9700873L SE 9700873 A SE9700873 A SE 9700873A SE 9700873 A SE9700873 A SE 9700873A SE 9700873 L SE9700873 L SE 9700873L
Authority
SE
Sweden
Prior art keywords
signal
microphone
speaker
voice telephone
simple voice
Prior art date
Application number
SE9700873A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE511650C2 (en
SE9700873D0 (en
Inventor
Johan Gnosspelius
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE9700873A priority Critical patent/SE511650C2/en
Publication of SE9700873D0 publication Critical patent/SE9700873D0/en
Priority to BR9808240-0A priority patent/BR9808240A/en
Priority to AU64264/98A priority patent/AU735505B2/en
Priority to CN 98804832 priority patent/CN1255255A/en
Priority to JP53949498A priority patent/JP2001514823A/en
Priority to CA002283590A priority patent/CA2283590A1/en
Priority to EP98909895A priority patent/EP0974205A1/en
Priority to PCT/SE1998/000332 priority patent/WO1998040974A1/en
Priority to TW87103302A priority patent/TW407435B/en
Publication of SE9700873L publication Critical patent/SE9700873L/en
Publication of SE511650C2 publication Critical patent/SE511650C2/en

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephone Function (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Selective Calling Equipment (AREA)

Abstract

The purpose of the present invention is thus to reduce the echo introduced by cross-talk. The problem described above, with how to reduce the echo introduced by cross-talk is solved by to the microphone and to the speaker introduce switches controlled by a state-machine which take as input the signal energy of the signal from the microphone, a VAD flag of the signal from the microphone, the signal energy of the signal to the speaker and a VAD flag of the signal to the speaker.
SE9700873A 1997-03-11 1997-03-11 Method and apparatus for reducing echo in a telephone application SE511650C2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
SE9700873A SE511650C2 (en) 1997-03-11 1997-03-11 Method and apparatus for reducing echo in a telephone application
PCT/SE1998/000332 WO1998040974A1 (en) 1997-03-11 1998-02-24 Echo reducing phone with state machine controlled switches
JP53949498A JP2001514823A (en) 1997-03-11 1998-02-24 Echo-reducing telephone with state machine controlled switch
AU64264/98A AU735505B2 (en) 1997-03-11 1998-02-24 Echo reducing phone with state machine controlled switches
CN 98804832 CN1255255A (en) 1997-03-11 1998-02-24 Echo reducing phone with state machine controlled switches
BR9808240-0A BR9808240A (en) 1997-03-11 1998-02-24 Process and apparatus for reducing echo when transmitting voice in a telephone application, and personal computer for transmitting and receiving voice with a telephone application
CA002283590A CA2283590A1 (en) 1997-03-11 1998-02-24 Echo reducing phone with state machine controlled switches
EP98909895A EP0974205A1 (en) 1997-03-11 1998-02-24 Echo reducing phone with state machine controlled switches
TW87103302A TW407435B (en) 1997-03-11 1998-03-06 Simple speaker phone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9700873A SE511650C2 (en) 1997-03-11 1997-03-11 Method and apparatus for reducing echo in a telephone application

Publications (3)

Publication Number Publication Date
SE9700873D0 SE9700873D0 (en) 1997-03-11
SE9700873L true SE9700873L (en) 1998-09-12
SE511650C2 SE511650C2 (en) 1999-11-01

Family

ID=20406109

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9700873A SE511650C2 (en) 1997-03-11 1997-03-11 Method and apparatus for reducing echo in a telephone application

Country Status (9)

Country Link
EP (1) EP0974205A1 (en)
JP (1) JP2001514823A (en)
CN (1) CN1255255A (en)
AU (1) AU735505B2 (en)
BR (1) BR9808240A (en)
CA (1) CA2283590A1 (en)
SE (1) SE511650C2 (en)
TW (1) TW407435B (en)
WO (1) WO1998040974A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1163787A2 (en) * 1999-03-15 2001-12-19 Vocaltec Communications Ltd. Echo suppression device and method for performing the same
US6754337B2 (en) * 2002-01-25 2004-06-22 Acoustic Technologies, Inc. Telephone having four VAD circuits
US7020257B2 (en) * 2002-04-17 2006-03-28 Texas Instruments Incorporated Voice activity identiftication for speaker tracking in a packet based conferencing system with distributed processing
CN101145803B (en) * 2007-09-06 2012-09-05 杭州华三通信技术有限公司 A method and device for separating echo reflection

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897832A (en) * 1988-01-18 1990-01-30 Oki Electric Industry Co., Ltd. Digital speech interpolation system and speech detector
GB2256351B (en) * 1991-05-25 1995-07-05 Motorola Inc Enhancement of echo return loss
FI110826B (en) * 1995-06-08 2003-03-31 Nokia Corp Eliminating an acoustic echo in a digital mobile communication system

Also Published As

Publication number Publication date
JP2001514823A (en) 2001-09-11
WO1998040974A1 (en) 1998-09-17
SE511650C2 (en) 1999-11-01
TW407435B (en) 2000-10-01
CN1255255A (en) 2000-05-31
AU6426498A (en) 1998-09-29
BR9808240A (en) 2000-05-16
SE9700873D0 (en) 1997-03-11
EP0974205A1 (en) 2000-01-26
AU735505B2 (en) 2001-07-12
CA2283590A1 (en) 1998-09-17

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Legal Events

Date Code Title Description
NUG Patent has lapsed