Method for discriminating window type of AAC codes

A window type and variance technology, applied in speech analysis, instruments, etc., can solve the problem of high complexity of the window type discrimination module, and achieve the effect of avoiding time-frequency transformation

Inactive Publication Date: 2010-11-24
BEIHANG UNIV
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Problems solved by technology

[0043] In order to overcome the defect of the high complexity of the window type discrimination module in the AAC encoding process, the present invention proposes a window type discrimination method based on the comparison between the intra-frame data energy variance and the inter-frame time-domain energy peak value

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  • Method for discriminating window type of AAC codes
  • Method for discriminating window type of AAC codes
  • Method for discriminating window type of AAC codes

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Embodiment Construction

[0065] The invention is a window type discrimination method for AAC audio coding. The method mainly utilizes the principle of energy conservation, does not use complex time-frequency transformation that consumes a large amount of system resources, and concentrates all calculations in the time domain.

[0066] The main content of the present invention is: use the method based on the comparison of intra-frame data energy variance and inter-frame time-domain energy peak to perform window type discrimination in AAC coding. The technical solution of the present invention will be further described below in conjunction with the accompanying drawings. The main steps are as follows:

[0067] Step 1: Evenly divide the input time-domain signal into blocks. In the case that the processing audio data per frame suggested by the AAC standard is 1024 sampling points, the input time domain signal is evenly divided into N blocks, where N=8.

[0068] Step 2: If figure 1 In 101, the total energ...

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Abstract

The invention discloses a method for discriminating a window type on the basis of the comparison of an intra-frame data energy variance and an inter-frame time domain energy peak value. The method comprises the following steps of: step one, uniformly partitioning input time domain signals; step two, solving the total energy of each block of the signals and solving the variance E_var of the energy of each block of the signals of a frame; step three, solving the energy peak values E_peak and El_peak of each block in the frame and the previous frame; and step four, analyzing the results of the step two and the step three to judge the window type of the frame. Because the whole discrimination process of the method is performed in a time domain range, a complex time-frequency transformation which consumes a large amount of system resources is avoided. Simultaneously, the computational operation complexity of the intra-frame data energy variance and the inter-frame data energy peak value is very low, and the finally obtained window type discrimination result is good.

Description

technical field [0001] The invention relates to the field of audio compression coding, in particular to a window type discrimination method used in the AAC coding process. Background technique [0002] AAC (Advanced Audio Coding) is a new generation of perceptual audio compression coding technology developed by the ISO MPEG organization on the basis of MPEG-2. Later, the MPEG-4 standard further enhanced this technology. This technology combines the advantages of various mainstream audio coding technologies, and has the characteristics of high signal compression ratio, good reconstruction sound quality, highly modularized encoding and decoding process, and flexible channel configuration. Compared with previous algorithms, AAC adopts some new coding tools, and in order to provide different services for different requirements, MPEG-4 AAC is divided into 4 levels of applications, namely the main level MAIN (Main), low complexity Layer LC (low complexity), sampling rate can be g...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00
Inventor 毛峡李硕
Owner BEIHANG UNIV
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