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Audio frequency equalizing method of decoder based on sub-band filter frame

A technology of sub-band filtering and equalization method, which is applied to instruments, speech analysis, pitch control, etc., can solve the problems of high complexity, multi-system resources, consumption, etc., to reduce the number of multiplications, reduce implementation complexity, and reduce resource consumption. Effect

Active Publication Date: 2012-04-11
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The audio equalization method of the traditional audio equalizer has high complexity and needs to consume more system resources

Method used

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  • Audio frequency equalizing method of decoder based on sub-band filter frame
  • Audio frequency equalizing method of decoder based on sub-band filter frame
  • Audio frequency equalizing method of decoder based on sub-band filter frame

Examples

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no. 1 example

[0040] figure 2 A first embodiment of the audio equalization method of the decoder based on the subband filtering framework of the present invention is shown. See figure 2 , the following is a detailed description of the audio equalization method of this embodiment.

[0041] Step S20: In the decoder based on the subband filtering framework, the time sampling points are obtained through the inverse quantization step.

[0042] The bandwidth of the signal composed of the time sampling points obtained through the inverse quantization step is basically limited within the frequency interval corresponding to each decoder subband. Of course, the reality may deviate slightly due to the imperfection of the filter bank.

[0043] For example, for an MPEG LAYER III (MP3) decoder, the input signal is divided into 32 subbands, and each subband represents a signal with a certain bandwidth. And for ADVANCEDAUDIO CODEC (ACC) decoder, the input signal is divided into 4 sub-bands.

[0044]...

no. 2 example

[0053] image 3 A second embodiment of an audio equalization method for a decoder based on a subband filtering framework of the present invention is shown. See image 3 , the following is a detailed description of the audio equalization method of this embodiment.

[0054] Step S30: In the decoder based on the sub-band filtering framework, time sampling points are obtained through an inverse quantization step.

[0055] The bandwidth of the signal composed of the time sampling points obtained through the inverse quantization step is basically limited within the frequency interval corresponding to each decoder subband. Of course, the reality may deviate slightly due to the imperfection of the filter bank.

[0056] For example, for an MPEG LAYER III (MP3) decoder, the input signal is divided into 32 subbands, and each subband represents a signal with a certain bandwidth. And for ADVANCEDAUDIO CODEC (ACC) decoder, the input signal is divided into 4 sub-bands.

[0057] In this ...

no. 3 example

[0066] Figure 4 A third embodiment of an audio equalization method for a decoder based on a subband filtering framework of the present invention is shown. See Figure 4 , the following is a detailed description of the audio equalization method of this embodiment.

[0067] Step S40: In the decoder based on the subband filtering framework, the time sampling points are obtained through the inverse quantization step.

[0068] The bandwidth of the signal composed of the time sampling points obtained through the inverse quantization step is basically limited within the frequency interval corresponding to each decoder subband. Of course, the reality may deviate slightly due to the imperfection of the filter bank.

[0069] For example, for an MPEG LAYER III (MP3) decoder, the input signal is divided into 32 subbands, and each subband represents a signal with a certain bandwidth. And for ADVANCEDAUDIO CODEC (ACC) decoder, the input signal is divided into 4 sub-bands.

[0070] In ...

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Abstract

The invention discloses an audio frequency equalizing method of a decoder based on sub-band filter frame, which realizes relatively low complexity and relatively small consumed resource. The technical scheme is as follows: the method comprises the following steps: (1) obtaining time sampling points by an inverse quantization step in a decoder based on the sub-band filter frame; and limiting the bandwidth of the signal constituted by the time sampling points in the frequency range corresponding to each decoder sub-band; and (2) performing plus adjustment on the time sampling point in the frequency band which is obtained by the inverse quantization step and is adjusted by an audio frequency equalizer before the sub-band of the decoder composites filtering.

Description

technical field [0001] The invention relates to a method for realizing an audio equalizer, in particular to a method for realizing an audio equalizer in a decoder with a subband filter bank. Background technique [0002] In various audio playback devices, such as audio playback software, portable audio players, etc., audio equalizers are indispensable. Its main function is to filter the audio signal according to the characteristics of different audio signals, such as pop music, classical music, voice, etc., to produce better music effects for the listener. [0003] The main principle of a digital audio equalizer (referred to as an audio equalizer) is to modify an audio signal in the frequency domain to achieve a certain sound effect. For example, if you want to enhance the effect of the human voice, the equalizer usually emphasizes the low-frequency component, that is, the human pitch frequency component, and relatively reduces the proportion of the high-frequency component...

Claims

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Application Information

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IPC IPC(8): G10L19/00H03G5/00H04S7/00G10L19/26
Inventor 黄鹤云林福辉
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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