Linear prediction coefficient generation during frame erasure or

Pulse or digital communications – Repeaters – Testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Linear prediction coefficient generation during frame erasure or does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Linear prediction coefficient generation during frame erasure or, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear prediction coefficient generation during frame erasure or will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-570169

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.