Speech decoder having an interpolation circuit for updating back

Details Speech decoder having an interpolation circuit for updating back Speech decoder having an interpolation circuit for updating back

1994-11-07

1998-09-15

Kuntz, Curtis A.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704228, 704265, G10L 500

Patent

active

058094601

ABSTRACT:
In a LPC speech signal decoder, background noise is simulated during periods of silence at the transmitting end based upon a background noise frame containing information about the background noise at the sending end. When the silence persists, the transmitter periodically updates the background noise frame previously send by transmitting an updating background noise frame. When an update background noise frame is received, an interpolation is performed so as to make the simulated background noise sound natural to the listener. The interpolation process includes a step of selecting between interpolation spectrum parameters which are produced by the interpolation process and the updated spectrum parameters which are based solely upon the most recent updated background noise frame.

REFERENCES:
patent: 4435832 (1984-03-01), Asada et al.
patent: 4630305 (1986-12-01), Borth et al.
patent: 4937873 (1990-06-01), McAulay et al.
patent: 5146504 (1992-09-01), Pinckley
patent: 5432859 (1995-07-01), Yang et al.
Recommendation GSM 06.12, "Comfort Noise Aspects for Full-Rate Speech Traffic Channels," ETSI/PT 12, pp. 1-6, Feb. 1992.
GSM Recommendation: 06.10, "GSM Full Rate Speech Transcoding," ETSI/GSM, pp. 1-93, Jan. 1990.
GSM Recomendation 06.31 and 06.10, released by ETSI/PT 12, Jan. 1990.
Chapter 5 of Sadaoki Furui, "Digital Speech Processing", Tokai University Publication Center, 1st Ed., Sep. 25, 1985.

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