HIGHLY EFFICIENT SOUND ENCODER

Title:

HIGHLY EFFICIENT SOUND ENCODER

Document Type and Number:

Japanese Patent JP2993324

Kind Code:

B2

Abstract:

PURPOSE: To provide the highly efficient sound encoder which better satisfies the auditory mentality and improves the tone quality.
CONSTITUTION: An audio signal has several samples segmented by a blind segmenting part 1, and the audio signal of each sample is divided into plural subbands by an orthogonal transformation part 2. An auditory mentality analysis part 3 analyzes the audio signal with the analysis band width in each frequency area, which is narrower than the subband width and narrower than the critical band width on auditory mentality and is ideally 1/2 to 1/3 of the critical band width, to determine the number of quantization bits in each subband. A quantizing and encoding part 4 quantizes and encodes the audio signal of each divided subband with this number of quantization bits by an orthogonal transformation part 2.

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Inventors:

FUCHIGAMI NORIHIKO
UENO SHOJI

Application Number:

JP20572193A

Publication Date:

December 20, 1999

Filing Date:

July 28, 1993

Export Citation:

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Assignee:

NIPPON BIKUTAA KK

International Classes:

H03M7/30; G10K15/04; G10L19/02; G10L19/035; (IPC1-7): H03M7/30; G10L7/04

Domestic Patent References:

JP3263926A
JP6318875A

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