Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1988-10-11
1989-07-18
Harkcom, Gary V.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 38, G10L 500
Patent
active
048500224
ABSTRACT:
A speech signal processing system in which the correlation is removed from the sample values of a speech waveform supplied to an inverse-filter for obtaining sample values of a prediction residual waveform, phase-equalizing filter coefficients are determined to have phase-characteristic inverse to that of the prediction residual waveform at each pitch position of the speech waveform, the phase-equalizing filter coefficients are set as filter coefficients of the phase-equalizing filter, and the speech waveform or the prediction residual waveform is passed through the phase-equalizing filter, thereby zero-phasing the prediction residual waveform or the prediction residual waveform component in the speech waveform and concentrating energy around the pitch position.
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patent: 4472832 (1984-09-01), Atal et al.
patent: 4561102 (1985-12-01), Prezas
patent: 4672670 (1987-06-01), Wang et al.
patent: 4742550 (1988-05-01), Fette
"On Synthesizing Natural Sounding Speech by Linear Prediction", by B. S. Atal, et al., ICASSP 79, Apr. '79, pp. 44-47.
"A Harmonic Deviations Linear Prediction Vocoder for Improved Narrowband Speech Transmission," by V. R. Vishwanathan, ICASSP 82, pp. 610-613, May '82.
Honda Masaaki
Moriya Takehiro
Anderson Lawrence E.
Harkcom Gary V.
Nippon Telegraph and Telephone Public Corporation
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