Apparatus and method for data compression using signal-weighted

Details Apparatus and method for data compression using signal-weighted Apparatus and method for data compression using signal-weighted

1993-01-29

1994-04-05

Cain, David C.

Pulse or digital communications

Repeaters

Testing

380 46, H04K 100

Patent

active

053012054

ABSTRACT:
A data compression apparatus for compressing a digital input signal to provide a compressed digital output signal. In the apparatus, a circuit derives plural spectral coefficients from the digital input signal, and groups the spectral coefficients into bands. An adaptive bit allocation circuit adaptively allocates a number of spectrum-dependent quantizing bits among the bands to allocate to each band a number of spectrum-dependent quantizing bits for quantizing each of the spectral coefficients in the band. The number of spectrum-dependent quantizing bits allocated to each band by the adaptive bit allocation circuit is determined according to the band magnitude, weighted depending on the band frequency.

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