Linear prediction coefficient generation during frame erasure or

Details Linear prediction coefficient generation during frame erasure or Linear prediction coefficient generation during frame erasure or

1994-03-14

1996-11-12

Moore, David K.

Pulse or digital communications

Repeaters

Testing

395 228, 395 241, 375350, C10L 302, H04B 1406

Patent

active

055748252

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: 5450449 (1995-09-01), Kroon
Lara-Barron et al, "Packet based embedded encoding for transmission of low-bit-rate-encoded speech in packet networks"; IEEE Proceedings. Part I: Communications, Speech and Vision, vol. 139 iss. 5, Oct. 1992.
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).
T. 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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