Comfort noise generator for echo cancelers

Details Comfort noise generator for echo cancelers Comfort noise generator for echo cancelers

1995-09-15

1999-09-07

Chang, Vivian

Electrical audio signal processing systems and devices

Dereverberators

704228, 379406, H04B 320

Patent

active

059498889

ABSTRACT:
The invention describes a method and device of comfort noise generation for echo cancelers. The invention stores the actual background noise of a channel in a noise buffer. When the echo suppressor is activated by the echo canceler to suppress any unwanted signals on the channel, the buffer provides the stored noise to the channel to provide continuous background noise. To ensure that neither speech nor impulse noise enters the buffer, hangover delays and energy threshold levels are provided such that signals within the delay period or signals which exceed the energy threshold level are screened from entering the buffer.

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patent: 5537509 (1996-07-01), Swaminathan et al.

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