MDCP: Patent Abstact US04516258: Bit allocation generator for adaptive transform coder

US04516258 Bit allocation generator for adaptive transform coder

Assignee AT&T Bell Laboratories

Assign./Filed May 7, 1985/ June 30, 1982

Inventors Ching; Yau-Chau, Tomcik; James D.

Summary Adaptive bit allocation scheme for transform speech encoders. Seems to predate using perceptual distortion criteria.

Abstract Adaptive bit allocation to a set of spectral transform coefficients is optimized by setting a predetermined first (maximum) threshold, then allocating one bit to those coefficients above the threshold, no bits to those below. If the total number of bits has not been allocated, the threshold is lowered an "integer" step to a second threshold, and again one bit allocated to those coefficients above the second threshold. The procedure is iterated until all the total bits are allocated or, if too many bits are allocated after the last integer step, a "fractional" step threshold is used.

US04516258	Bit allocation generator for adaptive transform coder
Assignee	AT&T Bell Laboratories
Assign./Filed	May 7, 1985/ June 30, 1982
Inventors	Ching; Yau-Chau, Tomcik; James D.
Summary	Adaptive bit allocation scheme for transform speech encoders. Seems to predate using perceptual distortion criteria.
Abstract	Adaptive bit allocation to a set of spectral transform coefficients is optimized by setting a predetermined first (maximum) threshold, then allocating one bit to those coefficients above the threshold, no bits to those below. If the total number of bits has not been allocated, the threshold is lowered an "integer" step to a second threshold, and again one bit allocated to those coefficients above the second threshold. The procedure is iterated until all the total bits are allocated or, if too many bits are allocated after the last integer step, a "fractional" step threshold is used.