Method for reducing pitch search time for vocoder

Details Method for reducing pitch search time for vocoder Method for reducing pitch search time for vocoder

1996-06-24

1998-08-25

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704207, 704209, 704268, G10L 902

Patent

active

057992711

ABSTRACT:
The present invention relates to the method to receive a speech signal, to perform a recognition weighting process on it, to synthesize a synthetic speech signal, to calculate an autocorrelation of the synthetic speech signal whose delay is a predetermined value and an autocorrelation whose delay is 0, to divide the square of the former by the latter, to calculate a pitch lag and a pitch filter coefficient by calculating only the part of a positive peak with skipping over the part of a negative peak by using the results from the dividing operation, and to calculate and output the pitch lag and the pitch filter coefficient by repeating the above process Thus, real-time implementation of CELP vocoder can be achieved.

REFERENCES:
patent: 5426718 (1995-06-01), Funaki et al.
patent: 5457783 (1995-10-01), Chhatwal
patent: 5657419 (1997-08-01), Yoo et al.
Proceedings of the IEEE 1995 Custom Integrated Circuits Conference, Yoo et al., "Efficient DSP design for vocoder application," pp. 189-192, May 1995 .

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