JPS6424696A - Echo canceller device for acoustic application - Google Patents
Echo canceller device for acoustic applicationInfo
- Publication number
- JPS6424696A JPS6424696A JP18144187A JP18144187A JPS6424696A JP S6424696 A JPS6424696 A JP S6424696A JP 18144187 A JP18144187 A JP 18144187A JP 18144187 A JP18144187 A JP 18144187A JP S6424696 A JPS6424696 A JP S6424696A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- change
- tap coefficient
- microphone
- filter
- 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 cancel an echo signal effectively by using a voice switch, to change over an on-microphone with respect to plural microphones and giving a tap coefficient in response to a change in echo path characteristics between a speaker and the plural microphones to an adaptive filter. CONSTITUTION:A microphone switching unit 11 sets a gain to an OFF microphone and the number of ON-microphones and gives its output signal to a subtracter 6 and its component y(k) is cancelled by a pseudo echo signal y(k) from the adaptive filter 5. The filter 5 estimates the echo path characteristics between the speaker 1 and plural microphones, forms characteristics close thereto and generates the signal y(k) from a reception signal x(k) according to the characteristics. A tap coefficient selection circuit 13 always monitors a signal S and if a change exists in the signal S from the unit 11, the circuit 13 revises the tap coefficient of the filter 5 in response to the change. The change is implemented by using tap coefficient memories 14a, 14b,-14N.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18144187A JP2509627B2 (en) | 1987-07-21 | 1987-07-21 | Acoustic eco-canceller device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18144187A JP2509627B2 (en) | 1987-07-21 | 1987-07-21 | Acoustic eco-canceller device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6424696A true JPS6424696A (en) | 1989-01-26 |
JP2509627B2 JP2509627B2 (en) | 1996-06-26 |
Family
ID=16100824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18144187A Expired - Lifetime JP2509627B2 (en) | 1987-07-21 | 1987-07-21 | Acoustic eco-canceller device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2509627B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2495726C2 (en) * | 2008-01-16 | 2013-10-20 | Берингер Ингельхайм Фарма Гмбх Унд Ко. Кг | Nozzle and inhaler and method of nozzle fabrication |
CN111201712A (en) * | 2017-09-25 | 2020-05-26 | 全球硅片有限公司 | Adaptive filter |
-
1987
- 1987-07-21 JP JP18144187A patent/JP2509627B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2495726C2 (en) * | 2008-01-16 | 2013-10-20 | Берингер Ингельхайм Фарма Гмбх Унд Ко. Кг | Nozzle and inhaler and method of nozzle fabrication |
CN111201712A (en) * | 2017-09-25 | 2020-05-26 | 全球硅片有限公司 | Adaptive filter |
CN111201712B (en) * | 2017-09-25 | 2023-04-21 | 全球硅片有限公司 | Adaptive filter |
Also Published As
Publication number | Publication date |
---|---|
JP2509627B2 (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 |