Pitch post-treatment method, filter and pitch post-treatment system

A filter and pitch technology, applied in the field of filters, pitch post-processing systems, and pitch post-processing methods, can solve problems such as implementation complexity, reduce access and shift operations, improve perceptual quality, and reduce complexity.

Active Publication Date: 2012-07-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The pitch post-processing technology in the prior art requires a large number of shift and state update operations on the registers, which is complicated to implement

Method used

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  • Pitch post-treatment method, filter and pitch post-treatment system
  • Pitch post-treatment method, filter and pitch post-treatment system
  • Pitch post-treatment method, filter and pitch post-treatment system

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Embodiment Construction

[0033] A technical solution of a pitch post-processing method, a filter, and a pitch post-processing system proposed in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] refer to figure 2 , illustrates a flow chart of a pitch post-processing method provided by an embodiment of the present invention. Depend on figure 2 It can be seen that the pitch post-processing method includes:

[0035] S1, according to the energy ratio E of the current frame and the previous frame of the decoded pitch synthesis signal com and preset threshold E thr Determine whether post-processing is required, specifically,

[0036] When the E com greater than the preset E thr , if it is judged that post-processing is necessary, execute step S2, otherwise go to step S4.

[0037] S2. Perform filtering processing on the pitch synthesis signal. In this embodiment, the filtering process includes obtaining at least two part...

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Abstract

The invention discloses a pitch post-treatment method. The pitch post-treatment method comprises that an energy ratio of a current frame and a post frame of a decoded pitch synthesis signal is compared with a preset threshold value to confirm pitch post-treatment; the pitch post-treatment comprises the filter treatment of the pitch synthesis signal; and the filter treatment comprises the followingsteps: obtaining at least two gain control values corresponding to at least two partial adjustment factors according to the gain of the pitch synthesis signal and the partial adjustment factors; andcombining the gain control values and the partial adjustment factors to obtain a filter function. Accordingly, the invention also discloses a filter and a pitch post-treatment system. The invention reduces the accessing and shifting operations of registers, removes the design of a low-pass filter in the prior art and greatly lowers the complexity.

Description

technical field [0001] The invention relates to speech processing technology, in particular to a pitch post-processing method, a filter and a pitch post-processing system. Background technique [0002] With the rise of 3G technology, people put forward higher requirements for digital audio coding technology. Due to the expansion of multimedia services, not only higher encoding efficiency and real-time performance are required, but also the audio encoding bandwidth needs to be further expanded, or relatively good encoding and decoding performance can be achieved at a lower bit rate. [0003] Extended Adaptive Multi-Rate Wideband puls (AMR-WB+) has a hybrid Algebraic Code Excited Linear Prediction (ACELP) / Transform Coded eXcitation (TCX) model, bandwidth Extended and stereo coding technologies, AMR-WB+ can have excellent coding quality at low bit rates. However, due to the low code rate, when encoding the required parameters, some fine structure information of the speech has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/14G10L19/26
CPCG10L19/26
Inventor 杨毅张清苗磊郎玥
Owner HUAWEI TECH CO LTD
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