Digital speech coder with different excitation types

Details Digital speech coder with different excitation types Digital speech coder with different excitation types

1985-08-28

1990-03-27

Clark, David L.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 702

Patent

active

049127640

ABSTRACT:
An speech analysis and synthesis system where pitch information for excitation is transmitted during voiced segments of speech and modified residual information for excitation is transmitted during unvoiced speech segments along with linear predictive coded (LPC) parameters. The speech analysis portion of the system uses a pitch detection circuit to determine when the speech is voiced or unvoiced and to calculate the pitch information during voiced segments. A multi-pulse excitation forming circuit generates the modified residual signal which is obtained from the cross correlation of the residual signal and the LPC-recreated original signal. The pitch detection circuit controls a multiplexer which selects either the output of the multi-pulse excitation forming circuit or the output of the pitch detection circuit for transmission as the excitation information with LPC parameters to the synthesizer portion of the system.

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