JPS6418320A - Echo canceller - Google Patents
Echo cancellerInfo
- Publication number
- JPS6418320A JPS6418320A JP17560687A JP17560687A JPS6418320A JP S6418320 A JPS6418320 A JP S6418320A JP 17560687 A JP17560687 A JP 17560687A JP 17560687 A JP17560687 A JP 17560687A JP S6418320 A JPS6418320 A JP S6418320A
- Authority
- JP
- Japan
- Prior art keywords
- echo
- converters
- canceller
- signal
- adf
- 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.)
- Pending
Links
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 abstract 1
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
PURPOSE:To keep the excellent state in talking quality by monitoring the peak power of a tap coefficient and an input echo signal, comparing it with a prescribed threshold value, detecting the presence of a gain in an echo path and controlling the attenuation in response to the result. CONSTITUTION:An echo canceller 100 is inserted to a line via A/D converters 518, 520 and D/A converters 522, 524. In this case, a level diagram to incoming line and outgoing lines is kept properly to an extent by fixed amplifiers 526, 508, 510 and 528. The canceller 100 subtracts a pseudo echo signal Sin(k) caused in an adaptive digital filter ADF 512 from a signal bypassed from the received signal to be outputted to the sender side via an indoor and microphone 506 as an echo signal Sin(k) to cancel the echo. The ADF 12 deduces the transfer function Q(Z) (impulse response) by means of the algorithm of the learning identification method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17560687A JPS6418320A (en) | 1987-07-14 | 1987-07-14 | Echo canceller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17560687A JPS6418320A (en) | 1987-07-14 | 1987-07-14 | Echo canceller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6418320A true JPS6418320A (en) | 1989-01-23 |
Family
ID=15999033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17560687A Pending JPS6418320A (en) | 1987-07-14 | 1987-07-14 | Echo canceller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6418320A (en) |
-
1987
- 1987-07-14 JP JP17560687A patent/JPS6418320A/en active Pending
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