Adaptive transform coding by selecting optimum block lengths acc

Details Adaptive transform coding by selecting optimum block lengths acc Adaptive transform coding by selecting optimum block lengths acc

1990-11-14

1993-08-10

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

341 67, 381 31, H04B 166

Patent

active

052356230

ABSTRACT:
Subblocks of input digital samples are stored into a buffer at frame intervals and segmented into blocks having an integral multiple of the length of the subblock. Each block is encoded into transform coefficients and stored into a memory. Each coefficient is squared and those of the squared transform coefficients which correspond to high-frequency components of the input digital samples are summed and a minimum value is detected therefrom as corresponding to an optimum block length. Those transform coefficients which correspond to the optimum block length are selected from the memory and multiplexed with a signal representative of the optimum block length. In a modification, interblock differences are detected between successive transform coefficients of equal block length and squared. Those of the squared interblock differences which correspond to equal block length are summed, producing a set of squared sums for each block length. A variation is detected between a representative squared sum of a given set and a representative squared sum of a successive set to identify a block length which corresponds to the variation as an optimum block length.

REFERENCES:
patent: 4394774 (1983-07-01), Widergren et al.
patent: 4860313 (1989-08-01), Shpiro
patent: 5109417 (1992-04-01), Freider et al.
"Adaptive Transform Coding of Speech Signals", Rainer Zelinski and Peter Noll, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-25, No. 4, Aug. 1977.
"Approaches to Adaptive Transform Speech Coding at Low Bit Rates", Rainer Zelinski and Peter Noll, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-27, No. 1, Feb. 1979.

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