WO2002021807A3 - Echo reduction in two-way communication - Google Patents

Echo reduction in two-way communication Download PDF

Info

Publication number
WO2002021807A3
WO2002021807A3 PCT/GB2001/004007 GB0104007W WO0221807A3 WO 2002021807 A3 WO2002021807 A3 WO 2002021807A3 GB 0104007 W GB0104007 W GB 0104007W WO 0221807 A3 WO0221807 A3 WO 0221807A3
Authority
WO
WIPO (PCT)
Prior art keywords
way communication
echo reduction
volume
microphone
loudspeaker
Prior art date
Application number
PCT/GB2001/004007
Other languages
French (fr)
Other versions
WO2002021807A2 (en
Inventor
Jon Bigwood
Paul Mcmahon
Original Assignee
Simoco Int Ltd
Jon Bigwood
Paul Mcmahon
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 Simoco Int Ltd, Jon Bigwood, Paul Mcmahon filed Critical Simoco Int Ltd
Publication of WO2002021807A2 publication Critical patent/WO2002021807A2/en
Publication of WO2002021807A3 publication Critical patent/WO2002021807A3/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
    • 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

Abstract

A two-way communication device comprises a microphone (4) and a loudspeaker (8). THe device determines the volume at which the device reproduces the signals it receives, e.g. by the setting of a volume control (16) or via an energy level detector (28). Means (10, 14; 6, 22) is provided for automatically adjusting the gain applied to sound collected by the microphone (4) in the opposite direction to changes in the determined reproduction volume.
PCT/GB2001/004007 2000-09-07 2001-09-06 Echo reduction in two-way communication WO2002021807A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0021974A GB0021974D0 (en) 2000-09-07 2000-09-07 Echo reduction in two-way communication
GB0021974.1 2000-09-07

Publications (2)

Publication Number Publication Date
WO2002021807A2 WO2002021807A2 (en) 2002-03-14
WO2002021807A3 true WO2002021807A3 (en) 2002-05-16

Family

ID=9899039

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/004007 WO2002021807A2 (en) 2000-09-07 2001-09-06 Echo reduction in two-way communication

Country Status (2)

Country Link
GB (2) GB0021974D0 (en)
WO (1) WO2002021807A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8416945B2 (en) * 2004-03-26 2013-04-09 Plantronics, Inc. Adaptive duplexing for amplified telephone

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987001255A1 (en) * 1985-08-20 1987-02-26 Motorola, Inc. Speakerphone for radio and landline telephones
US4710953A (en) * 1985-11-26 1987-12-01 Siemens Aktiengesellschaft Speech control in a telephone station
EP0288078A2 (en) * 1987-04-24 1988-10-26 Motorola Inc. Speakerphone using digitally compressed audio to control voice path gain
EP0495360A2 (en) * 1991-01-15 1992-07-22 AEG MOBILE COMMUNICATION GmbH Arrangement for volume control in a hands free telephone device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT393426B (en) * 1987-09-03 1991-10-25 Siemens Ag Oesterreich HANDS-FREE DEVICE
JPH08204619A (en) * 1995-01-26 1996-08-09 Nec Corp Echo suppressor
US5867573A (en) * 1996-02-06 1999-02-02 Lucent Technologies Inc. Telephone handset interface with feedback control
DE60113985T2 (en) * 2000-05-18 2006-06-29 Ericsson Inc., Plano SOUND ADAPTIVE COMMUNICATION SIGNAL LEVEL CONTROL

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987001255A1 (en) * 1985-08-20 1987-02-26 Motorola, Inc. Speakerphone for radio and landline telephones
US4710953A (en) * 1985-11-26 1987-12-01 Siemens Aktiengesellschaft Speech control in a telephone station
EP0288078A2 (en) * 1987-04-24 1988-10-26 Motorola Inc. Speakerphone using digitally compressed audio to control voice path gain
EP0495360A2 (en) * 1991-01-15 1992-07-22 AEG MOBILE COMMUNICATION GmbH Arrangement for volume control in a hands free telephone device

Also Published As

Publication number Publication date
GB2367449A (en) 2002-04-03
WO2002021807A2 (en) 2002-03-14
GB0121569D0 (en) 2001-10-24
GB0021974D0 (en) 2000-10-25

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