Transform domain quantization technique for adaptive predictive

Details Transform domain quantization technique for adaptive predictive Transform domain quantization technique for adaptive predictive

1990-10-25

1993-04-27

Kuntz, Curtis

Pulse or digital communications

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Testing

375122, 341 51, 381 31, H04B 110, H04B 166

Patent

active

052068846

ABSTRACT:
A residual signal quantization technique used in the adaptive predictive coding of speech signals is based in the frequency domain. In predictive coders, a residual signal that results after redundancies are removed from the input signal using linear prediction techniques is quantized. The technique invented involves a transformation of the residual signal to the frequency domain and a quantization of the frequency domain coefficients. Further, the number of bits used to quantize each frequency coefficient is determined by an estimate of the power of the input signal at that frequency. Once the number of bits to be used for quantization is determined, the quantization noise power spectrum is shaped, and can be selectively shaped so as to form a desired reconstruction noise power distribution.

REFERENCES:
patent: 4184049 (1980-01-01), Crochiere et al.
patent: 4757517 (1988-07-01), Yatsuzuka
patent: 4905830 (1990-10-01), Barham et al.
patent: 4949383 (1990-08-01), Koh et al.

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