Method and apparatus for detection of tandem vocoding to modify

Details Method and apparatus for detection of tandem vocoding to modify Method and apparatus for detection of tandem vocoding to modify

1996-01-11

1999-05-11

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704221, 704228, 704267, G10L9/18

Patent

active

059038624

ABSTRACT:
When one vocoding system is coupled to another vocoding system, a tandem arrangement results. The tandem configuration results in voice quality degradation as speech is encoded and decoded, then encoded and decoded again. One reason for the degradation is that postfiltering performed at the output of the speech decoding process introduces distortions in the spectral content of the reconstructed speech as compared to the original speech. The present invention prevents the degradation due to the use of postfilters by modifying the postfiltering within the vocoders where a tandem configuration exists. A detection code is embedded within the data signal to indicate the existence of a tandem configuration. If the detection code is received at a vocoder, modified vocoding is established within the vocoders to prevent the degradation due to the postfiltering.

REFERENCES:
patent: 4782326 (1988-11-01), Bush
patent: 4802206 (1989-01-01), Yoshida et al.
patent: 5317567 (1994-05-01), Champion
patent: 5608779 (1997-03-01), Lev et al.
Elis D. Hanson, "Intelligibilty Testing of the Continuous Variable Slope Delta (CVSD) Coder-Decoder (CODEC)", Research and Development Technical Report ECOM-3393, Fort Monmouth, N.J., Feb. 1971, XP000573297.
Elis D. Hanson, "Intelligibility Testing Of The Continuous Variable Slope Delta (CVSD) Coder-Decoder (CODEC)", Research and Development Technical Report ECOM-3393, AD 7721586, XP 000573297, Feb. 1971, 23 pages.

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