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

1995-02-16

1999-03-16

MacDonald, Allen R.

395 228, 395 232, 395 227, G10L 302, G10L 900

Patent

active

058840109

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. Specifically, the decoder generates and stores samples of a first excitation signal in a memory, and then, in response to a signal indicating a frame erasure, the decoder synthesizes a second excitation signal based on the previously stored samples. In particular, the second excitation is synthesized by correlating a first subset of the stored samples with a second subset thereof, identifying a set of stored excitation signal samples based on the correlation, and synthesizing the second excitation signal based on the identified samples. Finally, the decoder then filters the second excitation signal to synthesize a signal reflecting human speech.

REFERENCES:
patent: 4736428 (1988-04-01), Deprette et al.
patent: 4821324 (1989-04-01), Ozawa et al.
patent: 5091946 (1992-02-01), Osawa
patent: 5119424 (1992-06-01), Asakawa et al.
patent: 5293449 (1994-03-01), Tzeng
patent: 5353373 (1994-10-01), Drogo de lacovo et al.
patent: 5384891 (1995-01-01), Asakawa et al.
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 Noisy 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 Acoustic, Speech, and Signal Processing, vol. ASSP-26, No. 6, 587-598 (Dec. 1978).
Nafie et al, "Implementing of Recovery of Speech with Missing Samples on a DSP Chip" Electronics Letters, pp. 12-13, vol..30 iss. 1, Jan. 6, 1994.
Driessen, "Performance of Frame Synchronization in Packet Transmission Using Bit Erasure Information", IEEE Transactions on Communications,pp.567-573, vol. 39issue 4, Apr. 1991.
Jayant et al, "Speech Coding with Time-Varyng Bit Allocation to Excitation and PLC Parameters"; ICASSP '89, pp. 65-68, 1989.
Choi et al, "Effects of Packets Loss on 3 Toll Quality Speech Coders"; IEEE Conference on Telecomunications, pp. 380-385, 1989.
Suzuki et al, Missing Packet Recovery Techniques for Low-Bit Rate Coded Speech, IEEE Journal on Selected Areas in Communications, pp. 707-717, Jun. 1989.

Affiliated with

Also associated with

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

Comments { 0 }

Profile ID: LFUS-PAI-O-824454