Computational complexity reduction during frame erasure of packe

Details Computational complexity reduction during frame erasure of packe Computational complexity reduction during frame erasure of packe

1996-02-16

1998-02-10

Hafiz, Tariq R.

395 229, 395 271, G10L 302, G10L 900

Patent

active

057178224

ABSTRACT:
A speech coding system robust to frame erasure (or packet loss) is described. Illustrative embodiments are directed to a modified version of CCITT standard G.728. In the event of frame erasure, vectors of an excitation signal are synthesized based on previously stored excitation signal vectors generated during non-erased frames. This synthesis differs for voiced and non-voiced speech. During erased frames, linear prediction filter coefficients are synthesized as a weighted extrapolation of a set of linear prediction filter coefficients determined during non-erased frames. The weighting factor is a number less than 1. This weighting accomplishes a bandwidth-expansion of peaks in the frequency response of a linear predictive filter. Computational complexity during erased frames is reduced through the elimination of certain computations needed during non-erased frames only. This reduction in computational complexity offsets additional computation required for excitation signal synthesis and linear prediction filter coefficient generation during erased frames.

REFERENCES:
patent: 4969192 (1990-11-01), Chen
patent: 5233660 (1993-08-01), Chen
patent: 5327520 (1994-07-01), Chen
patent: 5339384 (1994-08-01), Chen
patent: 5414796 (1995-05-01), Jacobs et al.
patent: 5450449 (1995-09-01), Kroon
Study Group XV--Contribution No. "Title: A Solution for the P50 Problem:," International Telegraph and Telephone Consultative Committee (CCITT) Study Period 1989-1992, COM XV-No., 1-7 (May 1992).
R. V. Cox et al., "Robust CELP Coders for Noisy Backgrounds and Noise Channels," IEEE, 739-742 (1989).
D. J. Goodman et al., "Waveform Substitution Techniques for Recovering Missing Speech Segments in Packet Voice Communications," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-34, No. 6, 1440-1448 (Dec. 1986).
Y. Tohkura et al., "Spectral Smoothing Technique in PARCOR Speech Analysis-Synthesis," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-26, No. 6, 587-596 (Dec. 1978).

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