Data compressing and expanding apparatus with time domain and fr

Details Data compressing and expanding apparatus with time domain and fr Data compressing and expanding apparatus with time domain and fr

1992-08-21

1994-03-15

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

381 37, H03M 730

Patent

active

052949257

ABSTRACT:
The input digital signal is divided into blocks each composed of a number of samples, and first block floating is applied to each block. The each first block floating processed block is orthogonally transformed to provide spectral coefficients. The spectral coefficients are divided into bands, each band including at least one spectral coefficient. Second block floating is applied to each band to provide a second block floating processed band. Each of the second block floating processed bands is adaptively quantized by the adaptive bit allocation circuit. Common circuitry or processing is used to determine the block size and to apply block floating, which reduces the complexity of the hardware and/or the number of processing steps required.

REFERENCES:
patent: 4972484 (1990-11-01), Theile et al.
patent: 5049992 (1991-09-01), Citta et al.
patent: 5115240 (1992-05-01), Fujiwara et al.
patent: 5142656 (1992-08-01), Fielder et al.
patent: 5166686 (1992-11-01), Sugiyama

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