Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1987-04-02
1989-08-08
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381106, G10L 500
Patent
active
048560685
ABSTRACT:
A lower threshold for dynamic range compression and clipping is allowed by sinusoidal estimation and phase adjustment of the original speech signal to obtain a lower Peak to RMS ratio. A sinusoidal speech representation system is applied to the problem of speech dispersion by pre-processing the waveform prior to transmission to reduce the peak-to-RMS ratio of the waveform. The sinusoidal system first estimates and then removes the natural phase dispersion in the frequency components of the speech signal. Artificial dispersion based on pulse compression techniques is then introduced with little change in speech quality. The new phase dispersion allocation serves to preprocess the waveform prior to dynamic range compression and clipping, allowing considerably deeper thresholding than can be tolerated on the original waveform.
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McAulay Robert J.
Quatieri, Jr. Thomas F.
Engellenner Thomas J.
Kemeny Emanuel S.
Massachusetts Institute of Technology
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