Method for realizing digital audio encoding by using new psychoacoustic model and quick bit allocation

A psychoacoustic model and bit allocation technology, applied in the field of digital audio coding, can solve problems such as large amount of calculation, reduced sound quality, high complexity, etc., and achieve the effect of overcoming large amount of calculation.

Inactive Publication Date: 2010-09-29
BEIHANG UNIV
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Problems solved by technology

[0006] In order to overcome the deficiency of high complexity of AAC encoding, the new psychoacoustic model and fast bit allocation proposed by the present invention can quickly achieve the optimal perceptual quantization result, overcome the shortcomings of AAC with a large amount of calculation, and the sound quality is not significantly reduced. AAC encoding dedicated chip laid the foundation

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  • Method for realizing digital audio encoding by using new psychoacoustic model and quick bit allocation
  • Method for realizing digital audio encoding by using new psychoacoustic model and quick bit allocation
  • Method for realizing digital audio encoding by using new psychoacoustic model and quick bit allocation

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Embodiment Construction

[0082] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0083] The invention is a method for realizing digital audio coding by using a new type of psychoacoustic model and fast bit allocation. The window type is determined according to the variance of the input audio signal, and the quantization noise is allocated through the determined window type and the energy of the input audio signal. When assigning and quantizing, use the global scale factor of the previous frame as the initial value for the global scale factor, and obtain an accurate initial value for each segment scale factor through model derivation, and finally obtain the final global scale factor and the ratio of each segment through fine-tuning The value of the factor.

[0084] See attached figure 1, the time-domain signal after framing enters 101 and 102, and the audio encoder analyzes the input audio signal using a new psychoacoustic...

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Abstract

The invention provides a method for realizing digital audio encoding by using a new psychoacoustic model and quick bit allocation. The audio encoding method comprises the following steps of: by using a new psychoacoustic model, determining window types according to the variance of input audio signals; allocating quantized noise according to the determined window types and the energy of the input audio signals, namely calculating threshold values; performing quick bit allocation, giving up the conventional method of performing rate-distortion control by two layers of nested loops, taking a value of a global scale factor of the last frame as an initial value for global scale factors according to the short-time stable properties of the audio signals, and acquiring accurate an initial valve for each section of scale factor through model deduction; and finally acquiring values of a final global scale factor and each section of scale factor through fine adjustment. The method has the characteristics of low computational complexity and unconspicuous reduction of perceived tone quality.

Description

technical field [0001] The invention relates to a method for realizing digital audio coding by using a novel psychoacoustic model and fast bit allocation, wherein the novel psychoacoustic model reduces the complexity of encoding without losing sound quality, and the fast bit allocation greatly reduces the calculation of encoding quantity. Background technique [0002] Advanced Audio Coding (AAC) is a new generation of perceptual audio compression coding technology developed on the basis of MP3. This technology combines the advantages of various mainstream audio coding technologies. It has high signal compression ratio and good reconstruction sound quality. The codec process is highly modular and the channel configuration is flexible. [0003] AAC still complies with the basic coding specifications of MP3, such as using the psychoacoustic model 2 recommended by ISO, non-uniform quantization, Huffman coding, etc., but has improved many details and used many new coding modules...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/14G10L19/002
Inventor 毛峡邵伟国
Owner BEIHANG UNIV
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