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Method for controlling and adjusting code quantum of audio coding

一种音频编码、编码码率的技术，应用在宽带音频编码码量控制和调整领域，能够解决音质损失大、迭代次数影响编码速度等问题，达到提高编码速度、减少音质损失的效果

Inactive Publication Date: 2011-02-09
KUNSHAN JADE MICROELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the known encoding code amount control algorithm not only affects the encoding speed due to too many iterations, but also has a large loss of sound quality after encoding.

Method used

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  • Method for controlling and adjusting code quantum of audio coding
  • Method for controlling and adjusting code quantum of audio coding
  • Method for controlling and adjusting code quantum of audio coding

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0014] figure 1 It is the flow process of the audio coding bitrate control and modulation method of the present invention, according to figure 1 The process shown includes the following steps:

[0015] Step 101, assuming that the frequency spectrum of each current audio processing frame has been obtained, and the maximum absolute value of each Bark frequency band is obtained;

[0016] Step 102, setting the quantization factor value of each Bark frequency band according to the maximum absolute value of each Bark frequency band and the minimum quantization factor threshold of the current audio processing frame.

[0017] Step 103, quantize the frequency spectrum of each audio processing frame according to the quantization factor value set in step 102. Quantization of the spectrum is performed based on the Bark frequency band. The spectral values ​​of all fr...

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Abstract

The provided code quantity control and regulation method for audio coding comprises: obtaining every current audio frame frequency spectrum and the maximal absolute value of Bark frequency band; calculating the minimal quantizing factor threshold for Bark band; quantizing every frame with different factor, coding the quantized spectrum and calculating current code quantity to determine whether the difference with desired value in tolerance range, yes to format and output code flow; or else, regulating the quantizing factor; repeating. This invention can improve coding speed and reduces tone-quality loss.

Description

technical field [0001] The invention relates to an audio codec method, in particular to a method for controlling and adjusting the code amount of wideband audio coding. Background technique [0002] Code size control is one of the important steps in audio compression coding, which involves the bit allocation of encoder audio coding, and ultimately affects the coding efficiency and compression quality of audio. At present, known audio compression encoders based on wideband coding generally use an iterative method to realize the control of the encoding code amount of each audio processing frame. The code size control algorithm should be able to realize this process with as few iterations as possible. Therefore, adopting different code size control algorithms has a decisive effect on the performance of the encoder, including encoding speed and sound quality encoding loss. Currently known encoding bitrate control algorithms not only affect the encoding speed due to too many it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/02H03M7/30H04B1/66
CPCG10L25/18G10L19/035G10L19/24G10L19/0204G10L19/002
Inventor 欧阳合吴秉惠周毅罗霖万凯
Owner KUNSHAN JADE MICROELECTRONICS CO LTD