Audio decoding method and apparatus which recover high frequency component with small computation

A technology of high frequency components and recovery methods, applied in speech analysis, four-channel/stereo recording circuits, instruments, etc., can solve the problem of not being able to reduce the amount of calculation

Inactive Publication Date: 2004-01-14
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

In addition, the effect of reducing the amount of computation in performing post-processing methods cannot be achieved in prior art methods

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  • Audio decoding method and apparatus which recover high frequency component with small computation
  • Audio decoding method and apparatus which recover high frequency component with small computation
  • Audio decoding method and apparatus which recover high frequency component with small computation

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Embodiment Construction

[0018] see figure 1 , if audio data (test mp3) encoded according to the MPEG-1 layer 3 format is input, the MPEG-1 layer 3 decoder 110 divides the data into a left channel component and a right channel component, and generates respective pulse code modulation (PCM) signal (test pcm). If the thus generated PCM data is input to the high-frequency component restoring unit 120, the high-frequency component restoring unit 120 restores the high-frequency components of the left channel and the right channel, respectively, and outputs the restored PCM audio data (test app. pcm).

[0019] Therefore, in the prior art post-processing method, the high frequency domain is recovered by separately post-processing the left channel signal and the right channel signal output by the MPEG-1 layer 3 decoder.

[0020] However, in most audio signals, there is a high degree of redundancy between the left and right channel signals. Therefore, even in the MPEG-1 layer 3 coding algorithm, the left ch...

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Abstract

A method and apparatus for reducing the amount of computation in audio post processing, and more particularly, a method and apparatus for performing audio post processing using mode information that indicates the degree of similarity between a right channel signal and a left channel signal in MPEG-1 layer 3 audio data, are provided. If the difference between the two channel signals is small, a first mode is used in which the high frequency component of only one channel is recovered and the recovered high frequency component is used to recover the high frequency component of the other channel, and if the difference between the two channel signals is large, a second mode is selected in which the high frequency component in only one of every two frames is recovered alternately in the left channel and the right channel and the high frequency component of each of the skipped frames is interpolated based on the high frequency components of the previous frame and the next frame. By doing so, the new audio decoding method and apparatus recover high frequency components with a small amount of computation. The method reduces the amount of computation to less than half the amount of computation used in the prior art in recovering high frequency components.

Description

technical field [0001] The present invention relates to a method and apparatus for reducing the amount of calculations in audio back-end processing, and more particularly to a method and apparatus for using the detected The stereo mode information recovers the high frequency components in MPEG-1 layer 3 audio by choosing a mode that depends on the environment: the first mode, in which only the high frequency components of one channel are recovered, and when the two channel signals When the difference between is small, the recovered high-frequency component is used to recover the high-frequency component of the other channel, and the second mode, in which the high-frequency component in the only one of every two frames is in the left and right channels The channels are alternately restored, and when the difference between the two channel signals is large, the high frequency component of each skipped frame is interpolated based on the high frequency components of the previous fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10H1/00G10H1/12G10L19/02G11B20/00H04S1/00
CPCG10H1/125G11B20/00086H04S1/007G10H1/0091G11B20/00007G11B20/00992G10L19/008G10L19/02
Inventor 吴润学
Owner SAMSUNG ELECTRONICS CO LTD
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