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Virtual source location information based channel level difference quantization and dequantization method

A quantization method and level difference technology, applied in speech analysis, digital recording/reproduction, instruments, etc., can solve problems such as spectrum information distortion and quantization error, and achieve the effect of reducing bit rate and preventing sound degradation

Inactive Publication Date: 2008-07-16
ELECTRONICS & TELECOMM RES INST
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Problems solved by technology

In this way, since all CLD values ​​cannot be expressed with only a limited number of bits, the dynamic range of the CLD value is limited to a predetermined level or less
As a result, quantization errors are introduced and thus the spectral information is distorted

Method used

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  • Virtual source location information based channel level difference quantization and dequantization method
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  • Virtual source location information based channel level difference quantization and dequantization method

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Embodiment Construction

[0026] Hereinafter, exemplary embodiments of the present invention will be described in detail. However, the present invention is not limited to the exemplary embodiments described below, but can be implemented in many forms. Therefore, these exemplary embodiments are provided for complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] FIG. 2 schematically illustrates the configuration of a spatial audio coding (SAC) system to which the present invention is applied. As shown, the SAC system can be divided into an encoding part that generates, encodes and transmits the down-mix signal and spatial parameters from the N-channel audio signal, and recovers the N-channel audio signal from the down-mix signal and spatial parameters transmitted by the encoding part the decoding part. The encoding section includes a SAC encoder 210 , an audio encoder 220 , a spatial parameter quantizer 230 , and a spati...

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Abstract

Methods for Spatial Audio Coding (SAC) of a multi-channel audio signal and decoding of an audio bitstream generated by the SAC are provided. More particularly, methods of efficient quantization and dequantization of Channel Level Difference (CLD) used as a spatial parameter when SAC -based encoding of a multi-channel audio signal is performed are provided. A method of CLD quantization includes extracting sub-band-specific CLDs from an N-channel audio signal (N>1), and quantizing the CLDs by reference to a Virtual Source Location Information (VSLI)-based CLD quantization table designed using CLD quantization values derived from VSLI quantization values of the N-channel audio signal.

Description

technical field [0001] The present invention relates to spatial audio coding (SAC) of multi-channel audio signals and decoding of audio bitstreams generated by SAC, and more particularly to channel levels used as spatial parameters when performing SAC-based coding of multi-channel audio signals Efficient quantization and dequantization of difference (CLD). Background technique [0002] Spatial audio coding (SAC) is a technique for efficiently compressing multi-channel audio signals while maintaining compatibility with existing stereo audio systems. In the Moving Picture Experts Group (MPEG), the SAC technology has been standardized and named "MPEG Surround" since 2002, and is described in the ISO / IEC working document, ISO / IEC CD 14996-x (published on February 18, 2005 , and hereinafter referred to as "SAC standard document") are described in detail. [0003] Specifically, the SAC method is an encoding method for improving transmission efficiency by encoding N multi-channel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10
CPCG10L19/008G10L19/032
Inventor 徐廷一姜京玉洪镇佑金光基白承权韩敏洙田相培成宏模
Owner ELECTRONICS & TELECOMM RES INST