JPS6416030A - Echo canceller circuit - Google Patents
Echo canceller circuitInfo
- Publication number
- JPS6416030A JPS6416030A JP17088187A JP17088187A JPS6416030A JP S6416030 A JPS6416030 A JP S6416030A JP 17088187 A JP17088187 A JP 17088187A JP 17088187 A JP17088187 A JP 17088187A JP S6416030 A JPS6416030 A JP S6416030A
- Authority
- JP
- Japan
- Prior art keywords
- echo
- digital filter
- coefficient
- tap
- suppressing
- 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
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
PURPOSE:To contrive the improvement of the echo suppressing effect without increasing the tap number of an adaptive FIR digital filter by suppressing echo tail by the IIR digital filter whose coefficient is set in advance. CONSTITUTION:Each tap coefficient in a coefficient register 14 of the IIR digital filter 16 is preset so as to have a characteristic approcimating the average characteristic of an echo generated by various subscriber lines. The transmission signal inputted from an input terminal 1 is subjected to operation by a feedback convolution operation section 11 using each tap coefficient and a feedback convolution operation section 13 and the result is outputted as a pseudo echo 17 and a subtractor 8 subtracts a pseudo echo 17 from the reception signal. Moreover, the adaptive type FIR digital filter 7 is operated to cancel the difference between the echo included in the reception signal and the pseudo echo 17. Thus, the echo suppressing performance is improved without increasing the tap number of the adaptive FIR digital filter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17088187A JPS6416030A (en) | 1987-07-10 | 1987-07-10 | Echo canceller circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17088187A JPS6416030A (en) | 1987-07-10 | 1987-07-10 | Echo canceller circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6416030A true JPS6416030A (en) | 1989-01-19 |
Family
ID=15913041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17088187A Pending JPS6416030A (en) | 1987-07-10 | 1987-07-10 | Echo canceller circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6416030A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0388433A (en) * | 1989-06-27 | 1991-04-12 | Nec Corp | Echo canceller |
-
1987
- 1987-07-10 JP JP17088187A patent/JPS6416030A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0388433A (en) * | 1989-06-27 | 1991-04-12 | Nec Corp | Echo canceller |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0366584B1 (en) | Full-duplex digital speakerphone | |
US5084865A (en) | Echo canceller having fir and iir filters for cancelling long tail echoes | |
CA2088558A1 (en) | Multi-channel echo cancellation with adaptive filters having selectable coefficient vectors | |
EP0174749A1 (en) | Echo canceller | |
US4796296A (en) | PCM coder and decoder having function of two-wire/four-wire conversion | |
JPS55112049A (en) | Adaptive receiver | |
AU5018185A (en) | Full duplex speakerphone for radio and landline telephones | |
EP0798877A3 (en) | Partitioned echo canceler utilizing decimation echo location | |
EP0240056B1 (en) | Adaptive filter for producing and echo cancellation signal in a transceiver system for duplex digital communication through one single pair of conductors | |
EP0116968A1 (en) | Adaptive echo canceller | |
US5680451A (en) | Listener echo cancellation for modems | |
EP0276511B1 (en) | Adaptive time-descrete filter for forming a cancelling signal from synchronous data symbols | |
JPS6416030A (en) | Echo canceller circuit | |
GB2355632A (en) | Digital echo cancellation device | |
GB2342549A (en) | Sub-band echo cancellation | |
EP0690589A3 (en) | Apparatus for interference compensation in a digital microwave relay system | |
JPS6412648A (en) | Echo canceller | |
JPS6416031A (en) | Echo canceller circuit | |
EP0927467B1 (en) | Circuit configuration for adapting a multispeed modem to a line and adaptation method thereof | |
JP2002232329A (en) | Echo canceller | |
JPS6343015B2 (en) | ||
JP2841950B2 (en) | Echo canceller | |
JPS56166647A (en) | Echo canceler | |
Reyes et al. | Analog implementation of an active noise controller system for portable audio applications | |
JPH0771029B2 (en) | Eco-eraser |