Apparatus and method for speech coding

Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C704S220000

Reexamination Certificate

active

11095530

ABSTRACT:
A speech encoder includes an LPC synthesizer that obtains synthesized speech by filtering an adaptive excitation vector and a stochastic excitation vector stored in an adaptive codebook and in a stochastic codebook using LPC coefficients obtained from input speech. A gain calculator calculates gains of the adaptive excitation vector and the stochastic excitation vector and searches code of the adaptive excitation vector and code of the stochastic excitation vector by comparing distortions between the input speech and the synthesized speech obtained using the adaptive excitation vector and the stochastic excitation vector. A parameter coder performs predictive coding of gains using the adaptive excitation vector and the stochastic excitation vector corresponding to the codes obtained. The parameter coder comprises a prediction coefficient adjuster that adjusts at least one prediction coefficient used for the predictive coding according to at least one state of at least one previous subframe.

REFERENCES:
patent: 5327519 (1994-07-01), Haggvist et al.
patent: 5598504 (1997-01-01), Miyano
patent: 5664055 (1997-09-01), Kroon
patent: 5778334 (1998-07-01), Ozawa et al.
patent: 5864798 (1999-01-01), Miseki et al.
patent: 5915234 (1999-06-01), Itoh
patent: 6202045 (2001-03-01), Ojala et al.
patent: 6363341 (2002-03-01), Tolhuizen et al.
patent: 6470309 (2002-10-01), McCree et al.
patent: 6704702 (2004-03-01), Oshikiri et al.
patent: 7146311 (2006-12-01), Uvliden et al.
patent: 7191120 (2007-03-01), Oshikiri et al.
patent: 7194408 (2007-03-01), Uvliden et al.
patent: 2003/0093266 (2003-05-01), Banba
patent: 2167552 (1996-07-01), None
patent: 0883107 (1998-12-01), None
patent: 5-011799 (1993-01-01), None
patent: 5-035297 (1993-02-01), None
patent: 6-012097 (1994-01-01), None
patent: 6-083400 (1994-03-01), None
patent: 6-282298 (1994-10-01), None
patent: 8-202398 (1996-08-01), None
patent: 9-062299 (1997-03-01), None
patent: 9-120299 (1997-05-01), None
patent: 9-152897 (1997-06-01), None
patent: 9-190195 (1997-07-01), None
patent: 10-020894 (1998-01-01), None
patent: 10-097295 (1998-04-01), None
patent: 10-232696 (1998-09-01), None
patent: 10-233694 (1998-09-01), None
patent: 10-282998 (1998-10-01), None
Chen, “A Robust Low-Delay Celp Speech Coder at 16 KB/S,” in “Advances in Speech Coding,” edited by Atal et al., Kluwer Academic Publishers, Boston, Jan. 1991, pp. 25-35.
Gerson et al., “Vector Sum Excited Linear Prediction (VSELP) Speech Coding at 8 KBPS,” IEEE, Apr. 3, 1990, pp. 461-464.
Kataoka et al., “LSP and Gain Quantization for CS-ACELP Speech Coder,” NTT Review, Telecommunications Association, Tokyo, Japan, vol. 8, No. 4, Jul. 1996, pp. 30-35.
Lee et al., “A New Fast Pitch Search Algorithm Using the Abbreviated Correlation Function in CELP Vocoder,” Military Communications Conference, 1996, Milcom'96, Conference Proceedings, IEEE, McLean, VA, USA, Oct. 21-24, 1996, pp. 653-657.
Kuo et al., “speech Classification Embedded in Adaptive Codebook Search for CELP Coding,” Statistical Signal and Array Processing, Minneapolis, Apr. 27-30, 1993, Proceedings of the International Conference on Accoustics, Speech, and Signal Processing (ICASSP), New York, IEEE, US, vol. 4, Apr. 27, 1993, pp. 147-150.
Yasunaga et al., “ACELP Coding With Dispersed-Pulse Codebook,” IEICE Spring Convention Lecture Transactions, Mar. 1997, p. 253.
English Language Abstract of JP 9-062299.
English Language Abstract of JP 9-190195.
English Language Abstract of JP 9-120299.
English Language Abstract of JP 8-202398.
English Language Abstract of JP 6-012097.
English Language Abstract of JP 10-097295.
English Language Abstract of JP 6-282298.
English Language Abstract of JP 10-020894.
English Language Abstract of JP 6-083400.
English Language Abstract of JP 5-35297.
English Language Abstract of JP 10-232696.
English Language Abstract of JP 10-233694.
English Language Abstract of JP 10-282998.
English Language Abstract of JP 9-152897.
“Code-Excited Linear Prediction (CELP): High Quality Speech at Very Low Bit Rates” by M.R. Schroeder et al., Proc. ICASSP 1985.
“Fast CELP coding based on algebraic codes” by J-P. Adoul et al., Proc. IEEE Int. Conf. Acoustics, Speech, Signal Processing, 1987, pp. 1957-1960.
“A comparison of some algebraic structures for CELP coding of speech” by J-P. Adoul et al., Proc. IEEE Int. Conf. Acoustics, Speech, Signal Processing, 1987, pp. 1953-1956.
“Design and Description of CS-ACELP: A Toll Quality 8 kb/s Speech Coder” by Redwan Salami et al., IEEE trans. Speech and Audio Processing, vol. 6, No. 2, Mar. 1998.
U.S. Appl. No. 11/126,171 to Yasunaga et al., filed May 11, 2005.
U.S. Appl. No. 11/095,605 to Yasunaga et al., filed Apr. 1, 2005.
English language Abstract of JP 5-011799.

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

Apparatus and method for speech coding does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for speech coding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for speech coding will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3845959

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