Dynamic muting method for ADPCM coded speech

Details Dynamic muting method for ADPCM coded speech Dynamic muting method for ADPCM coded speech

1992-06-04

1994-05-03

Baker, Stephen M.

Excavating

381 94, 455 673, H04B 110

Patent

active

053094433

ABSTRACT:
A method and apparatus are provided for muting a audio signal in a digital communication system. The method includes the steps of integrating an indicated error per frame for a time interval and comparing the integrated value with a threshold. The method also includes the step of applying a heavy mute to a frame, with an indicated error, when the integrated value does not exceed the threshold and a light mute to a frame with an indicated error, when the integrated value exceeds the threshold. Integrating the indicated error allows a heavy mute to be applied to bad frames when errors are occasional in nature. Integration also allows a light mute to be applied in the case where the content of a signal has been highly corrupted with erroneous information thereby maximizing the information content of good frames while still allowing contributions from corrupted frames at a reduced signal level.

REFERENCES:
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patent: 4811404 (1989-03-01), Vilmur et al.
patent: 4943964 (1990-07-01), Hatanaka et al.
patent: 5148431 (1992-09-01), Hayashi
patent: 5163053 (1992-11-01), Okumura et al.
patent: 5187811 (1993-02-01), Baker et al.
patent: 5235334 (1993-08-01), Manvar et al.

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