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Method for realizing equalizer in moving picture experts group audio layer-3 (MP3) decoding process

An equalizer, MP3 technology, applied in the direction of amplification control, tone control, electrical components, etc., can solve the problem of wasting CPU (processor calculation amount, etc.), achieve significant energy improvement or attenuation effect, obvious effect, and low calculation amount Effect

Active Publication Date: 2011-10-05
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using a filter bank to process frequencies above 11K, there will be no effect and a waste of CPU (processor) calculations

Method used

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  • Method for realizing equalizer in moving picture experts group audio layer-3 (MP3) decoding process
  • Method for realizing equalizer in moving picture experts group audio layer-3 (MP3) decoding process
  • Method for realizing equalizer in moving picture experts group audio layer-3 (MP3) decoding process

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Embodiment Construction

[0030] figure 1 Show the flowchart of the method for realizing equalizer in the MP3 decoding process of the present invention, the present invention comprises the following steps:

[0031] (1) After synchronous processing, header analysis, side information analysis, scaling factor decoding and Huffman decoding, the audio stream of MP3 is quantized to obtain the spectrum information. After general MP3 decoding processing such as inverse quantization, spectrum reordering, stereo processing, and aliasing elimination, 32 subbands are obtained, and each subband contains 36 original frequency domain samples; when the window is long, the 36 original frequency domain samples The samples equally divide the bandwidth of the corresponding subband; when the window is short, the 36 original frequency domain samples are divided into 3 groups representing the same frequency band, each group of 12 original frequency domain samples equally divides the bandwidth of the corresponding subband

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Abstract

The invention discloses a method for realizing an equalizer in a moving picture experts group audio layer-3 (MP3) decoding process. The method comprises the following steps of: (1) executing a universal MP3 decoding process on an audio code stream of an MP3 to obtain sub-bands, wherein each sub-band comprises a primary frequency domain sample; (2) performing gain control on the primary frequency domain sample corresponding to a given frequency band range according to the needs of an equalization mode, and calculating a gain-controlled frequency domain sample; and (3) continuing decoding the gain-controlled frequency domain sample of the sub-band, outputting a decoded sound sample after the frequency domain sample passes through an inverse modified discrete cosine transform and combined filter group, and transmitting the sound sample to a digital-to-analogue converter for playback. The method is used for simultaneously realizing sound effects in the MP3 decoding process. Compared with the prior art, the invention can achieve better equalization effects and greatly reduce the power consumption of a portable audio player at the same time.

Description

technical field [0001] The invention relates to the field of audio data playback, in particular to a method for realizing an equalizer in an MP3 decoding process. Background technique [0002] Equalizer, also known as EQ, is the abbreviation of Equalizer. Its function is to adjust the gain value of the signal in each frequency band, to compensate for the defects of the speaker and the sound field through the adjustment of various electrical signals of different frequencies, to compensate and modify various sound sources, and to achieve the effect of changing the sense of hearing. Ordinary people first came into contact with equalizers on the high-end VCRs in the 1980s. At that time, the high-end VCRs all had N-band equalization adjustment, and that adjuster was the equalizer; this equalizer was based on analog signals, and later gradually developed on the PC. Out of the digital equalizer. All kinds of audio equipment will have a frequency response curve to characterize the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G5/00
Inventor 李军冯穗豫陈占东王彦飞胡胜发
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD