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Method for improving audio decoder decode precision

An audio decoder and precision technology, applied in the direction of instruments, code conversion, speech analysis, etc., can solve problems such as distortion, and achieve the effect of improving decoding accuracy and effect

Active Publication Date: 2009-01-21
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the result of multiplying these two numbers is smaller and exceeds the set minimum expression range, then the result will be kept as 0, and the result will still be 0 no matter how large the number is multiplied, which will cause great distortion

Method used

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  • Method for improving audio decoder decode precision
  • Method for improving audio decoder decode precision

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Embodiment Construction

[0016] Such as figure 2 Shown, the inventive method implements in the following steps:

[0017] 1. Traversing the dequantized spectral coefficients of the current frame and the previous frame, comparing them one by one to find the maximum value of the absolute value;

[0018] 2. Compare the maximum value found in step 1 with a preset value, if it is less than the preset value, go to the next step; if it is greater than the preset value, directly compare the current frame and the previous frame The dequantized spectral coefficients are subjected to joint stereo processing, frequency-domain-time-domain conversion, and anti-aliasing processing;

[0019] 3. It is calculated that the maximum value obtained in step 1 needs to be shifted to the left by the least number of digits to be greater than the preset maximum value; for example, the obtained maximum value is 0x01, and the preset maximum value is 0x2000, then 0x01 needs to be Shift left 14 bits to get 0x4000;

[0020] 4. Un...

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Abstract

The disclosed method to improve decoding precision of audio decoder comprises in turn: decoding, reverse quantizing, uniform stereo treating, frequency-time converting, anti-aliasing treating, multi-filter synthesizing, and outputting sample; wherein, adding normalization treatment between the second and third steps, and zoom-out treatment between the last two steps. This invention can improve decoding precision and effect greatly without more storage space.

Description

technical field [0001] The invention relates to a method for improving audio decoding precision on a fixed-point DSP / CPU, especially when the storage space is very limited and the precision of the units involved in the calculation cannot be very high, the decoding precision can be obviously improved. Background technique [0002] Audio compression technology can improve the utilization of storage space, and more content can be saved in limited storage space, especially on portable devices. Currently widely used audio codec algorithms include MP3, AAC organized by MPEG, WMA of Microsoft, etc. These formats are currently supported on almost all PCs, networks, and handheld portable devices. Various coding tools are also very common. Ordinary people can save the CD they bought on a portable device through audio encoding, and can enjoy more wonderful music anytime, anywhere. [0003] At present, the core processing units on handheld devices do not support large-capacity memory...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/30G10L19/00G10L19/022
Inventor 黄立新汤雪钗
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD