MDCP: Patent Abstact US05301205: Apparatus and method for data compression using signal-weighted quantizing bit allocation

US05301205 Apparatus and method for data compression using signal-weighted quantizing bit allocation

Assignee Sony Corporation

Assign./Filed April 5, 1994/ Jan. 29, 1993

Inventors Tsutsui; Kyoya, Akagiri; Kenzo

Summary ATRAC - includes detailed discussion of ATRAC's bit allocation method.

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.

US05301205	Apparatus and method for data compression using signal-weighted quantizing bit allocation
Assignee	Sony Corporation
Assign./Filed	April 5, 1994/ Jan. 29, 1993
Inventors	Tsutsui; Kyoya, Akagiri; Kenzo
Summary	ATRAC - includes detailed discussion of ATRAC's bit allocation method.
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.