Feedback-controlled speech processor normalizing peak level over

Details Feedback-controlled speech processor normalizing peak level over Feedback-controlled speech processor normalizing peak level over

1998-03-31

2000-05-23

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704224, G01L 2100, G01L 1104

Patent

active

060675128

ABSTRACT:
A speech processor for processing speech signals in a manner that minimizes the peak to average ratio of a vocal tract response waveform of the speech signal with minimal loss of intelligibility of speech reproduced from the processed waveform. This is accomplished, in general terms, by providing a speech processor for providing an approximately constant peak level within periods of a vocal tract response waveform. The speech processor may include a feedback-controlled signal compressor multiplier and an input signal delay means. The attack, hang and decay parameters of the speech processor are determined in accordance with typical vocal tract response characteristics to optimize the balance between compression of the vocal tract response waveform and introduction of harmonics into the resulting signal. The gain of the speech processor is controlled in accordance with the input signal representing the vocal tract response waveform and is limited to prevent signal distortion when little or no signal is present. The input to the speech processor signal multiplier is delay compensated by an amount determined in accordance with the attack time and the sample rate of the input signal, such that the peak of an impulse portion of the vocal tract response waveform enters the speech processor at approximately the instant that speech processor gain has been adjusted to an appropriate level for the peak of the impulse portion.

REFERENCES:
patent: 5471651 (1995-11-01), Wilson
patent: 5812969 (1998-09-01), Barber, Jr. et al.
patent: 5815532 (1998-09-01), Bhattacharya et al.

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