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Method and apparatus for implementing fundamental tone enhancement post-treatment

A pitch and pitch period technology, applied in the field of audio decoding, can solve the problems of complex post-processing, achieve the best pitch enhancement effect, and reduce the complexity

Inactive Publication Date: 2011-06-01
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] It can be seen from the above implementation process that in the pitch enhancement post-processing algorithm, it is necessary to perform frequency division operation on the decoded speech signal first, and perform different filtering processes on different sub-frequency bands, resulting in complicated implementation of the corresponding post-processing process.

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  • Method and apparatus for implementing fundamental tone enhancement post-treatment
  • Method and apparatus for implementing fundamental tone enhancement post-treatment
  • Method and apparatus for implementing fundamental tone enhancement post-treatment

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Embodiment Construction

[0028] In the embodiment of the present invention, the energy characteristics of the decoded signal are fully utilized, and are compared with the decoded pitch gain and pitch cycle value to obtain the pitch information that best reflects the characteristics of the sound, thereby providing the option to use the pitch enhancement post-processing filter A threshold evaluation and decision implementation scheme for better perceptual quality of the decoded signal.

[0029] In the embodiment of the present invention, it may specifically be as follows: firstly, obtain the gain of the decoded signal, and then judge whether the gain exceeds a predetermined threshold, and if so, perform long-term post-filtering on the decoded signal and output it, otherwise, directly output the decoded signal. Wherein, the post-filter used for post-filtering the decoded signal may be an all-zero post-filter.

[0030] In addition, in the embodiment of the present invention, if the all-zero post-filter i...

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Abstract

The invention relates to a pitch-enhancement post-processing implementation method and a device thereof. The implementation course consists of the following steps: obtaining the gain of decoded signals; judging whether the gain is beyond a preset threshold value; after confirming that the gain is beyond the preset threshold value, processing the decoded signals with longtime post-filtering and then outputting. Therefore, the method has simple judgment of the collocation and threshold value of the filter parameter so as to simplify the post-processing course and obtain better effect on pitch enhancement at the same time.

Description

technical field [0001] The invention relates to the technical field of audio decoding, in particular to an adaptive post-processing technology for pitch enhancement in the audio decoding process. Background technique [0002] During the audio decoding process, in order to improve the perceived effect of the decoded speech, post-processing operations need to be performed on the decoded speech. The purpose of the post-processing is to enhance information related to perceptual quality in the synthesized sound signal, that is, reduce or remove interference information that degrades perceptual quality, so as to improve perceptual quality. At present, the technologies adopted in the post-processing process are generally divided into formant post-processing technology and pitch post-processing technology. In pitch post-processing techniques, the frequency response of the filter needs to be harmonically related. [0003] Taking the AMR-WB+ (Adaptive Multi-Rate Wideband plus) codec...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/14G10L19/26
CPCG10L19/26
Inventor 刘丽李伟曹军彬孙晓刚张清许丽净许剑峰杜正中胡晨苗磊杨毅
Owner HUAWEI TECH CO LTD