Quantized voice-frequency coding method based on minimized global noise masking ratio criterion and entropy coding

An entropy coding and minimization technology, applied in the audio coding field based on the minimization of the global noise masking ratio criterion and entropy coding and quantization, can solve the problems of high AAC operation complexity and low quantization accuracy, and achieve the best perceptual effect. , Overcome the effect of high computational complexity

Inactive Publication Date: 2003-12-10
BEIJING E WORLD TECH
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Problems solved by technology

[0004] In order to overcome the shortcomings of the above two quantization methods, the quantization method proposed by the present invention can quickly achieve the optimal perceptual quantization result, which not only overcomes the shortcomings o...

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  • Quantized voice-frequency coding method based on minimized global noise masking ratio criterion and entropy coding
  • Quantized voice-frequency coding method based on minimized global noise masking ratio criterion and entropy coding
  • Quantized voice-frequency coding method based on minimized global noise masking ratio criterion and entropy coding

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] The present invention is an audio coding method based on minimizing the global noise masking ratio criterion and entropy coding and quantization. The time-domain audio signal is divided into frames of a certain length; each frame of the time-domain signal is transformed into a frequency domain coefficients; the frequency domain coefficients of each frame are divided into different frequency subbands; at the same time, the time domain signal is analyzed by the psychoacoustic model to obtain the noise masking threshold of each frequency domain subband; under the control of each subband noise masking threshold , the number of available bits is allocated to each subband of the frequency domain coefficients, and the bit allocation follows the criterion of minimizing the global noise-masking ratio.

[0033] see figure 1, the audio encoder first reads in a time-domain...

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Abstract

The present invention relates to a voice frequency coding method containing two portions of coding voice signal and quantization, and includes the following steps: dividing time domain voice frequency signal, into the framke with a certain length; making time domain signal of every frame undergo the process of time frequency conversion to obtain frequency domain coefficient, dividing the frequency domain coefficient of every frame into different frequency subbands, at the same time, making the time domain signal undergo the process of psychological acoustic model analysis to obtain noise masking threshold of every frequency domain subband, under the control of the noise masking threshold of every subband distributing making bit distribution and quantization of frequency domain coefficient of every subband, and making entropy coding so as to effectively raise compression efficiency.

Description

technical field [0001] The invention relates to a processing method for encoding and quantizing an input audio signal, in particular to an audio encoding method based on minimizing the global noise-masking ratio criterion and entropy encoding and quantization. technical background [0002] The LAYER1 (MP1) and LAYER2 (MP2) standards for audio coding in the MPEG1 standard are two audio-perceptual coding standards. In these two standards, the input time-domain audio signal is divided into blocks of frame length; each frame The time domain signal is transformed into frequency domain coefficients, and the frequency domain coefficients are divided into several frequency domain subbands; at the same time, the psychoacoustic model analyzes the time domain signal of the current frame to obtain the noise masking threshold of each frequency domain subband; then bit allocation The process progressively allocates the number of available bits to each subband such that the largest noise-m...

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Application Information

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IPC IPC(8): H03M7/30
Inventor 潘兴德朱晓明
Owner BEIJING E WORLD TECH
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