Low bit rate speech coder using adaptive open-loop subframe pitc

Details Low bit rate speech coder using adaptive open-loop subframe pitc Low bit rate speech coder using adaptive open-loop subframe pitc

1996-09-26

2000-01-11

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704207, 704219, G10L 914

Patent

active

060146222

ABSTRACT:
A pitch lag coding device and method using interframe correlation inherent in pitch lag values to reduce coding bit requirements. A pitch lag value is extracted for a given speech frame, and then refined for each subframe. For every speech frame having N samples of speech, LPC analysis and vector quantization are performed for the whole coding frame. The LPC residual obtained for each frame is then processed such that pitch lag values for all subframes within the coding frame are analyzed concurrently. The remaining coding parameters, i.e., the codebook search, gain parameters, and excitation signal, are then analyzed sequentially according to their respective subframes.

REFERENCES:
patent: 5307441 (1994-04-01), Tzeng
patent: 5414796 (1995-05-01), Jacobs et al.
patent: 5495555 (1996-02-01), Swaminathan
patent: 5596676 (1997-01-01), Swaminathan et al.
patent: 5600754 (1997-02-01), Gardner et al.
Andreas S. Spanias, "Speech Coding: A Tutorial Review", Proc. IEEE, vol. 82, No. 10, p. 1541-1582, Oct. 1994.

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