Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1985-08-28
1989-12-26
Harkcom, Gary V.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 36, G10L 702
Patent
active
048903280
ABSTRACT:
A speech analysis and synthesis system where pitch information for excitation is transmitted during voice segments of speech and pulse excitation or noise excitation is transmitted during unvoiced speech segments along with linear predictive coding (LPC) parameters. The decision of whether to transmit noise excitation or pulse excitation is performed by comparing the variance of the residual to the square of the mean amplitude of the rectified residual for each frame. If the result of this comparison is greater than a threshold value, pulse excitation is utilized otherwise noise excitation is used. The pulse excitation comprises a subset of samples of the LPC residual as determined by the relative amplitudes and spacing of the local maxima in the LPC residual.
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Prezas Dimitrios P.
Thomson David L.
American Telephone and Telegraph Company
AT&T Bell Laboratories
Harkcom Gary V.
Merecki John A.
Moran John C.
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