Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1996-10-17
1999-04-27
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704219, 704222, 704208, G10L 502, G10L 914
Patent
active
058976159
ABSTRACT:
A speech packet transmission system of the present invention has a speech coding device and a speech decoding device. In the coding device a speech coder (21) codes a PCM (Pulse Code Modulation) speech and outputs the resulting speech coded data and prediction coefficients. A speech detector (22) determines whether the input PCM speech is voiced or unvoiced. A transmission prediction coefficient memory (23) memorizes the prediction coefficients. A delay circuit (24) delays the speech coded data by a preselected delay time. On the transition from an unvoiced state to a voiced state, a transmitter (25) sends the prediction coefficients as a leading packet and then sends the delayed speech coded data as the following packet. In the decoding device, a receiver (31) received the packets from the coding device separates the packets into the prediction coefficients and the coded data. A speech decoder (32) decodes, based on the prediction coefficients separated from the leading packet, the speech decoded data separated from the following packets and thereby reproduces the PCM signal.
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Hudspeth David R.
NEC Corporation
Sofocleous M. David
LandOfFree
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