Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
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.
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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.
DeJaco Andrew P.
Gardner William R.
Jacobs Paul E.
Lam S. Katherine
Sih Gilbert C.
Golden Linli L.
MacDonald Allen R.
Miller Russell B.
Rouse Thomas R.
Smits Talivaldis Ivars
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