Method of coding a sampled speech signal vector

Details Method of coding a sampled speech signal vector Method of coding a sampled speech signal vector

1991-07-31

1993-05-25

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 40, 395 2, G01L 500

Patent

active

052147061

ABSTRACT:
The invention relates to a method of coding a sampled speech signal vector by selecting an optimal excitation vector in an adaptive code book. This optimal excitation vector is obtained by maximizing the energy normalized square of the cross correlation between the convolution of the excitation vectors with the impulse response of a linear filter and the speech signal vector. Before the convolution the vectors of the code book are block normalized with respect to the vector component largest in magnitude. In a similar way the speech signal vector is block normalized with respect to its component largest in magnitude. Calculated values for the squared cross correlation C.sub.I and the energy E.sub.I and stored corresponding values C.sub.M, E.sub.M for the best excitation vector so far are divided into a mantissa and a scaling factor with a limited number of scaling levels. The number of levels can be different for squared cross correlation and energy. During the calculation of the products C.sub.I .multidot.E.sub.M and E.sub.I .multidot.C.sub.M, which are used for determining the optimal excitation vector, the respective mantissas are multiplied and a separate scaling factor calculation is performed.

REFERENCES:
patent: 4727354 (1988-02-01), Lindsay
patent: 4817157 (1989-03-01), Gerson
patent: 4860355 (1989-08-01), Copperi
patent: 4899385 (1990-02-01), Ketchum et al.

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