JPS6429096A - Echo canceling device - Google Patents
Echo canceling deviceInfo
- Publication number
- JPS6429096A JPS6429096A JP18361487A JP18361487A JPS6429096A JP S6429096 A JPS6429096 A JP S6429096A JP 18361487 A JP18361487 A JP 18361487A JP 18361487 A JP18361487 A JP 18361487A JP S6429096 A JPS6429096 A JP S6429096A
- Authority
- JP
- Japan
- Prior art keywords
- microphone
- adaptive filter
- echo
- path characteristics
- echo path
- 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
Links
Landscapes
- Circuit For Audible Band Transducer (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
PURPOSE:To effectively cancel an echo signal by controlling so that the switching of an on-mike can be executed in synchronization with the completion of an initial setting to the adaptive filter of the echo path characteristics for the microphone. CONSTITUTION:A speaker 1 and plural microphones 2a-2n are acoustically coupled. When the microphone, whose input signal level exceeds a prescribed threshold, is detected out of plural microphone 2a-2n, the echo path characteristics, which are obtained in respect of the microphone, are obtained from coefficient memories 14a-14n and set to an adaptive filter 5. The microphone, whose input signal level exceeds the prescribed threshold, is set as the on-mike in synchronization with the completion of the initial setting for the adaptive filter of the echo path characteristics. The echo signal is canceled by a subtracter 6.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18361487A JP2509629B2 (en) | 1987-07-24 | 1987-07-24 | Echo canceller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18361487A JP2509629B2 (en) | 1987-07-24 | 1987-07-24 | Echo canceller |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6429096A true JPS6429096A (en) | 1989-01-31 |
JP2509629B2 JP2509629B2 (en) | 1996-06-26 |
Family
ID=16138868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18361487A Expired - Lifetime JP2509629B2 (en) | 1987-07-24 | 1987-07-24 | Echo canceller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2509629B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2785482A1 (en) * | 1998-10-28 | 2000-05-05 | France Telecom | Echo sound reduction hands free/distant sound signal process having microphones spaced apart and phase/amplitude detector with separator unit loudspeakers passing reduced echo signal. |
JP2006304032A (en) * | 2005-04-22 | 2006-11-02 | Yamaha Corp | Sound reinforcement system |
JP2006340151A (en) * | 2005-06-03 | 2006-12-14 | Matsushita Electric Ind Co Ltd | Acoustic echo canceling device, telephone using it, and acoustic echo canceling method |
US8238547B2 (en) | 2004-05-11 | 2012-08-07 | Sony Corporation | Sound pickup apparatus and echo cancellation processing method |
-
1987
- 1987-07-24 JP JP18361487A patent/JP2509629B2/en not_active Expired - Lifetime
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2785482A1 (en) * | 1998-10-28 | 2000-05-05 | France Telecom | Echo sound reduction hands free/distant sound signal process having microphones spaced apart and phase/amplitude detector with separator unit loudspeakers passing reduced echo signal. |
EP1014669A1 (en) * | 1998-10-28 | 2000-06-28 | France Telecom | Acoustic system for echo cancellation |
US6724899B1 (en) * | 1998-10-28 | 2004-04-20 | France Telecom S.A. | Sound pick-up and reproduction system for reducing an echo resulting from acoustic coupling between a sound pick-up and a sound reproduction device |
US8238547B2 (en) | 2004-05-11 | 2012-08-07 | Sony Corporation | Sound pickup apparatus and echo cancellation processing method |
JP2006304032A (en) * | 2005-04-22 | 2006-11-02 | Yamaha Corp | Sound reinforcement system |
JP2006340151A (en) * | 2005-06-03 | 2006-12-14 | Matsushita Electric Ind Co Ltd | Acoustic echo canceling device, telephone using it, and acoustic echo canceling method |
Also Published As
Publication number | Publication date |
---|---|
JP2509629B2 (en) | 1996-06-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080416 Year of fee payment: 12 |