CELP vocoder with efficient adaptive codebook search

Details CELP vocoder with efficient adaptive codebook search CELP vocoder with efficient adaptive codebook search

1991-05-31

1993-11-23

Fleming, Michael R.

395 231, G10L 900

Patent

active

052651908

ABSTRACT:
A new method for Code Excited Linear Predictive (CELP) coding of speech reduces the computational complexity by removing a convolution operation from a recursive loop used to poll the adaptive code book vectors. In a preferred embodiment, an impulse function of a short term perceptually weighted filter is first convolved with perceptual weighted target speech and the result cross-correlated with each vector in the codebook to produce an error function. The vector having the minimum error function is chosen to represent the particular speech frame being examined.

REFERENCES:
patent: 4220819 (1980-09-01), Atal
patent: 4677671 (1987-06-01), Garland et al.
patent: 4791670 (1988-12-01), Copperi et al.
patent: 4797925 (1989-01-01), Lin et al.
patent: 4817157 (1989-03-01), Gerson et al.
patent: 4890327 (1989-12-01), Bertrand et al.
patent: 4896361 (1990-01-01), Gerson et al.
patent: 4899385 (1990-02-01), Ketchum et al.
patent: 4910781 (1990-03-01), Ketchum et al.
patent: 4914699 (1990-04-01), Dunn et al.
patent: 4933957 (1990-06-01), Bottau et al.
patent: 4965789 (1990-10-01), Bottau et al.
patent: 4980916 (1990-12-01), Zinser et al.
patent: 5138662 (1992-08-01), Amano et al.
patent: 5173941 (1992-12-01), Yip et al.
patent: 5195137 (1993-03-01), Swaminatham
"Efficient Procedures for Finding the Optimum Innovation in Stochastic Coders", by I. M. Trancoso and B. S. Atal, from the proceedings at ICASSP 86 in Tokyo, OEEE, vol. 4, 1986, pp. 2375-2378.
"Telecommunications: Analog-to-Digital Conversion of Voice by 4800 Bit/Second Code Excited Linear Predictive (CELP) Coding", a Predraft of Federal Standard 1016, Aug. 31, 1989, pp. 1-20.

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