Echo detection, tracking, cancellation and noise fill in real ti

Details Echo detection, tracking, cancellation and noise fill in real ti Echo detection, tracking, cancellation and noise fill in real ti

1997-04-02

2000-12-26

Vo, Nguyen

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 370289, H04M 176, H04B 320

Patent

active

061671339

ABSTRACT:
A method for processing telecommunications signals to alleviate echo during a voice communication between a local talker and a remote talker comprises the application of circular buffers for near and far end signals to preserve processing time. Overlapping blocks of samples are processed and indexed by incrementing the index over time to generate an array for storing magnitude coherence versus time delay between outgoing and incoming samples. Echo is clipped based on power spectral matching. The clipped echo is replaced with noise fill of at least one of two types, white noise and tonal noise, at an appropriate level. Also, crackle which comprises high energy spikes and a residual echo effect which is low energy, bursty and non-linear may be identified and replaced with noise fill.

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