Adaptive predictive coding encoder for compression of quantized

Details Adaptive predictive coding encoder for compression of quantized Adaptive predictive coding encoder for compression of quantized

1990-05-16

1992-11-24

Fleming, Michael R.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

395 2, G10L 300

Patent

active

051669811

ABSTRACT:
In an adaptive predictive coding (APC) encoder for compression of quantized digital audio, the signal-to-quantization noise ratio is improved and more complicated input signal spectra can be processed through use of an input signal frequency spectrum detector employing linear predictive coding (LPC) analysis for setting the coefficients of the requantization error noise filter. The detector operates in synchronism with the predictive and noise filters so as to minimize the number of processing calculations while maximizing processing speed.

REFERENCES:
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patent: 4704730 (1987-11-01), Turner et al.
patent: 4811396 (1989-03-01), Yatsuzuka
ICASSP 80 Proceedings, vol. 2/3, Apr. 9, 1980, pp. 520-525, R. Visawanathan et al., "Speech-quality optimization of 16 kb/s adaptive predictive coders".

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