Signal coding method and apparatus

Details Signal coding method and apparatus Signal coding method and apparatus

1998-03-26

2000-03-07

Young, Brian

Coded data generation or conversion

Quantizer

341 51, H03M 700

Patent

active

060346329

ABSTRACT:
A signal coding apparatus including normalization circuit 101 for carrying out a linear prediction or the like to extract features of an input signal and for carrying out whitening. The signal whitened is transmitted to a T/F (time axis/frequency axis) conversion circuit 102 where the signal is subjected to a conversion such as the Modified Discrete Cosine Transform so as to obtain a coefficient y on the frequency axis. This coefficient y is supplied to a quantization (scalar quantization (SQ) and vector quantization (VQ)) circuit 103. A bit allocation circuit 104 uses the coefficient y and parameters such as a Linear Predictive Coding coefficient and a pitch from the normalization circuit 101 for carrying out quantization bit allocation for each coefficient. The quantization (SQ and VQ) circuit 103, according to this allocation bit, controls whether to carry out the SQ or VQ for each coefficient.

REFERENCES:
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patent: 5825311 (1998-10-01), Kataoka et al.
patent: 5903676 (1999-04-01), Wu et al.
V. Cuperman, Joint Bit Allocation and Dimensions Optimization for Vector Transform Quantization, IEEE Transactions on Information Theory, vol. 39, No. 1 (Jan. 1993).
Techniques de compression des signaux, pp. 134-139 (France 1995).

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