Apparatus and method for data compression using...

Details Apparatus and method for data compression using... Apparatus and method for data compression using...

H - Electricity

03

M

H03M 7/30 (2006.01) G11B 20/00 (2006.01) G11B 20/10 (2006.01) H04B 1/66 (2006.01) G10L 9/18 (1990.01)

Patent

CA 2088202

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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