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Audio frequency encoding and decoding quantification method, reverse conversion method and audio frequency encoding and decoding device

A technology of audio coding and quantization method, applied in the field of audio coding, which can solve the problems of different signal quantization errors, different bit numbers, and different sensitivity levels, and achieve the effect of improving overall efficiency and optimizing coding methods

Inactive Publication Date: 2008-01-16
VIMICRO CORP
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Problems solved by technology

[0012] However, since the sensitivity of the human ear to noise in different frequency bands is different, and after the transformation process is performed using different companding functions, the performance of the signal and the quantization error introduced by the quantization process are different, and the number of bits required for encoding after quantization is also Different
Therefore, performing a unified companding function transformation on the entire frame input signal cannot make full use of the characteristics of the signal itself and the human ear, and cannot effectively improve the overall efficiency of audio coding

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  • Audio frequency encoding and decoding quantification method, reverse conversion method and audio frequency encoding and decoding device
  • Audio frequency encoding and decoding quantification method, reverse conversion method and audio frequency encoding and decoding device

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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0039] Referring to FIG. 3 , FIG. 3 is a flowchart of a quantization method for audio coding in an embodiment of the present invention. As shown in Figure 3, the process includes the following steps:

[0040] Step 301, divide the transform domain signal into one or more subbands.

[0041] In the audio coding process, after the input signal is mapped from the time domain to the transform domain, the transform domain signal can be divided into one or more subbands in this step. Wherein, there may be multiple methods for dividing the subbands. For example, the transform domain signal may be divided according to preset division information, or the transform domain signal may be divided according to the signal information measured by the system and th...

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Abstract

The invention discloses an audio frequency coding quantization method, which includes: dividing the conversion domain signal into one sub-band or above; selecting a companding function to convert each sub-band so as to obtain the conversion coefficient of each sub-band; and quantifying the conversion coefficient of each sub-band. In addition, the invention also discloses a reverse conversion method of audio frequency decoding, which includes: making reverse conversion to each sub-band of the conversion domain signal according to the corresponding companding function in coding. At last, the invention also discloses an audio frequency coding device and an audio frequency decoding device, which, in the light of features of signals and ears, adopt the suitable companding function to convert different parts of each frame signal so as to optimize the coding way and enhance the overall efficiency of audio frequency coding.

Description

technical field [0001] The invention relates to audio coding technology, in particular to a quantization method of audio coding, an inverse transformation method of audio decoding, an audio coding device, and a decoding device. Background technique [0002] Currently, an audio coding device generally consists of four main parts, including: a filter bank, a psychoacoustic model, a quantization module, and an encoding module. Referring to FIG. 1 , FIG. 1 shows a schematic structural diagram of an audio encoding device in the prior art. [0003] Wherein, the filter bank is used for time transform domain mapping, maps the input audio signal from the time domain to the transform domain, and outputs the mapped transform domain signal to the bit allocation and quantization module. Among them, the transform domain or the frequency domain generally refers to the signal representation results obtained by various transform methods for the convenience of signal processing. These transf...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/02G10L19/032
Inventor 王箫程
Owner VIMICRO CORP
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