Gain estimation scheme for LPC vocoders with a shape index based

Details Gain estimation scheme for LPC vocoders with a shape index based Gain estimation scheme for LPC vocoders with a shape index based

1997-05-05

1999-09-14

Knepper, David D.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704221, 704223, G10L 914

Patent

active

059536977

ABSTRACT:
A gain estimation method for an LPC vocoder which utilizes shape indexes. The gain is estimated based on the envelope of the speech waveform. The gain is estimated such that the maximum amplitude of the synthetic speech just reaches the speech waveform envelope. The gain during voiced subframes is estimated as the minimum of the absolute value of ratio of the envelope and the impulse response of the LPC filter. The gain during unvoiced subframes is estimated as the minimum of the absolute value of the ratio of the envelope and the noise response of the LPC filter. The method results in a fast technique for estimating the gain.

REFERENCES:
patent: 5086471 (1992-02-01), Tanaka et al.
patent: 5664055 (1997-09-01), Kroon

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