MDCP: Patent Abstact US05734792: Enhancement method for a coarse quantizer in the ATRAC

US05734792 Enhancement method for a coarse quantizer in the ATRAC

Assignee Matsushita Electric Industrial Co., Ltd.

Assign./Filed March 31, 1998/ Dec. 6, 1993

Inventors Teh; Do Hui

Summary Improvement to ATRAC encoder to reduce quantization noise.

Abstract A method for enhancing a block companding uniform midtread quantizer in the ATRAC (Adaptive Transform Acoustic Coding) for the quantization of digital audio signals, wherein the audio signals are represented by a plurality of frames of quantized spectral components. The method includes modifying all spectral sample values in a defined frequency interval by a constant factor, calculating a scale factor for the frequency interval from a maximum spectral sample value, and quantizing all the spectral samples in the modified frequency interval with a modified quantizer.

US05734792	Enhancement method for a coarse quantizer in the ATRAC
Assignee	Matsushita Electric Industrial Co., Ltd.
Assign./Filed	March 31, 1998/ Dec. 6, 1993
Inventors	Teh; Do Hui
Summary	Improvement to ATRAC encoder to reduce quantization noise.
Abstract	A method for enhancing a block companding uniform midtread quantizer in the ATRAC (Adaptive Transform Acoustic Coding) for the quantization of digital audio signals, wherein the audio signals are represented by a plurality of frames of quantized spectral components. The method includes modifying all spectral sample values in a defined frequency interval by a constant factor, calculating a scale factor for the frequency interval from a maximum spectral sample value, and quantizing all the spectral samples in the modified frequency interval with a modified quantizer.