RCELP coder

Details RCELP coder RCELP coder

1995-09-19

1997-12-30

MacDonald, Allen R.

395 225, G10L 500

Patent

active

057040036

ABSTRACT:
An improved method of speech coding for use in conjunction with speech coding methods wherein speech is digitized into a plurality of temporally defined frames, each frame including a plurality of sub-frames, and the digitized speech is partitioned into periodic components and a residual signal. For each of a plurality of sub-frames of the residual signal, the improved method of speech coding selects and applies a time shift T to the sub-frame by applying a matching criterion to (a) the current sub-frame of the residual signal, and (b) a sample-to-sample (subframe-to-subframe) pitch delay determined by applying linear interpolation to known pitch delays occurring at or near frame-to-frame boundaries of previous frames.
The matching criterion is applied by minimizing .epsilon., where: ##EQU1## (r(n-T)) is the residual signal of the current frame shifted by time T, r(n-D(n)) is the delayed residual signal from a previously-occurring frame, n is a positive integer, r is the instantaneous amplitude of the residual signal, and D(n) is the sample-to-sample pitch delay determined by applying linear interpolation to known pitch delay values occurring at or near frame-to-frame boundaries.

REFERENCES:
patent: 3624302 (1971-11-01), Atal
patent: 4701954 (1987-10-01), Atal
patent: 5339384 (1994-08-01), Chen
Ser. No. 07/990309 now pending Kleijn filed Dec. 14, 1992.
Ser. No. 08/234504 now pending Kleijn filed Apr. 28, 1994.
Kleijn et al., "A 5.85 kb/s CELP Algorithm for Cellular Applications," IEEE ICASSP-93, vol. 2, pp. 596-599, Apr. 1993.

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