Signal coder for wide-band signals

Details Signal coder for wide-band signals Signal coder for wide-band signals

1997-05-27

1999-02-16

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704221, 704222, 704223, 704219, 704220, G10L 702

Patent

active

058730605

ABSTRACT:
Wide-band speech signals and also music signals are coded with relatively less computational efforts and less sound quality deterioration even at low bit rates. A spectral parameter calculator obtains a spectral parameter from sub-frames of an input signal from a sub-frame divider, and quantizes the obtained spectral parameter. A divider divides the difference result from a subcontractor into a plurality of sub-bands. Adaptive codebook circuits obtain a pitch prediction signal by obtaining pitch data in at least one of the sub-bands. Judging circuits execute pitch prediction judgment by using the pitch data in at least one of the sub-bands. A synthesizer synthesizes a pitch prediction signal. A subtractor subtracts the pitch prediction signal from the difference result obtained from a subtractor and thus obtains an excitation signal. An excitation quantizer quantizes the excitation signal with reference to an excitation codebook.

REFERENCES:
patent: 4945565 (1990-07-01), Ozawa et al.
patent: 5142584 (1992-08-01), Ozawa
patent: 5208862 (1993-05-01), Ozawa
patent: 5295224 (1994-03-01), Makamura et al.
patent: 5487128 (1996-01-01), Ozawa
patent: 5625744 (1997-04-01), Ozawa
C. Garcia-Mateo, et al., "Application of a Low-Delay Bank of Filters to Speech Coding", 1994 Sixth IEEE Digital Signal Processing Workshop, Proceedings of IEEE 6th Digital Signal Processing Workshop, Oct. 1-5, 1994, pp. 219-222.
G. Yang, "Multiband code-excited linear prediction (MBCELP) for speech coding", Signal Processing European Journal Devoted to the Methods and Applications of Signal Processing, vol. 31, No. 2, Mar. 1, 1993, pp. 215-227.
Nakamizo, "Signal Analysis and System Identification", publicshed by Corona Co., Ltd., 1988 pp. 82-87.
Sugamura, et al., "Speech Data Compression by Linear Spectrum Pair (LSP) Speech Analyzing/Synthesizing System", Transactions of the Japan Society of Electronic Communication, J64-A, pp. 599-605, 1981.
ICASSP 85 Proceedings, vol. 3 of 4, Mar. 1985, "Code-Excited Linear Prediction (CELP): High-Quality Speech At Very Low Bit Rates", by Manfred R. Schroeder, pp. 937-940.
ICASSP 88, vol. 1, 1988, "Improved Speech Quality And Efficient Vector Quantization In Selp", by W.B. Kleijn et al., pp. 155-158.
ICASSP 91, vol. 1, May 1991, "16 KBPS Wideband Speech Coding Technique Based On Algebraic Celp" by C. Laflamme et al., pp. 13-16.
Proceedings of the IEEE, vol. 78, No. 1, Jan. 1990, "Multirate Digital Filters, Filter Banks, Polyphase Networks, and Applications: A Tutorial" by P.P. Vaidyanathan, pp. 56-93.
ICASSP 90, vol. 2, Apr. 1990, "Pitch Predictors With High Temporal Resolution", by Peter Kroon et al., pp. 661-664.
IEEE Transactions on Communications, vol. COM-28, No. 1, Jan. 1980, "An Algorithm for Vector Quantizer Design" by Yoseph Linde et al., pp. 84-95.

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