Self adaptive filter and echo offset device

Abstract

The present invention provides self-adapting filter and echo neutralization unit accomplished utilizing said self-adapting filter, suitable for communication field. Said self-adapting filter is used for outputting simulating echo according to filter and providing compensation to circuit echo. The present invention can speed up self adaptation rate of convergence, improving echo neutralization unit performance without increasing calculated amount and realizing complexity.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to an adaptive filter and an echo canceller realized by using the adaptive filter. Background technique [0002] In the telephone system, the call quality is often affected by the echo (Echo). Line echo (Line Echo) is one of the main forms. The reason for the line echo is mainly caused by the impedance mismatch of the hybrid conversion coil (Hybrid), which acts as a two-wire and four-wire conversion. Ideally, a hybrid coil will fully transmit the far-end user's signal to the near-end user. However, in actual situations, due to impedance mismatch and other reasons, after the signal from the four-wire side to the second-wire side passes through the hybrid conversion coil, part of the signal will leak back to the four-wire side, and this part of the "leakage" signal will be transmitted back. The far end, so that the far end user can hear his own voice, which is the line echo, s...

AI Technical Summary

Problems solved by technology

[0023] The purpose of the present invention is to provide an adaptive filter, aiming at solving the problem in the prior art that the adaptive filter converges slowly for signals with strong correlation

Images