Method and device for selecting self-adapting codebook excitation signal

An adaptive codebook and excitation signal technology, applied in the field of digital speech coding, can solve the problems of high algorithm complexity and limited coding performance gain.

Active Publication Date: 2009-05-13
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0046] In the selection process of the above-mentioned adaptive codebook excitation signal, a closed-loop multiplex selection method is adopted, the algorithm complexity is relatively high, and the coding performance gain brought by it is limited

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  • Method and device for selecting self-adapting codebook excitation signal
  • Method and device for selecting self-adapting codebook excitation signal
  • Method and device for selecting self-adapting codebook excitation signal

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Embodiment Construction

[0059] The technical solutions of the present invention will be described below in conjunction with specific embodiments.

[0060] 1. Calculate the target signal and impulse response:

[0061] Perform perceptual weighting on the input speech signal, let the response of the perceptual weighting filter be w(n), and calculate the weighted domain signal wsp(n):

[0062] wsp(n)=speech(n)*w(n) (* means convolution)

[0063] Compute Weighted Synthesis Filters H ( z ) = W ( z ) A ^ ( z ) The zero-input response of xn2(n)

[0064] Let the target signal used for adaptive codebook search be xn(n):

[0065] xn(n)=wsp(n)-xn2(n)

[0066] The target signal will be used in the process...

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Abstract

The invention discloses a method and a device for selecting an adaptive codebook excitation signal. The method calculates high frequency excitation correlation according to the high frequency part of the searched adaptive codebook and the residual signals of the input speech signals. If the calculated high frequency excitation correlation is higher than the preset correlation threshold value, the searched adaptive codebook signal then is selected as the current adaptive codebook excitation signal; otherwise, the low frequency part of adaptive codebook searched and low pass filter disposed is selected as the current adaptive codebook excitation signal. The invention can improve wideband speech coding performance. Tests shows that the technical scheme improves coding signal-to-noise ratio (SNR) compared with prior art. Besides, the complexity of selection calculation is greatly decreased. Statistical analyses suggests that the complexity of the calculation method is only 60 percent of that in prior art.

Description

technical field [0001] The invention relates to the technical field of digital speech coding, in particular to a method and a device for selecting an adaptive codebook excitation signal. Background technique [0002] Along with the increasingly widespread application of multimedia, there is a huge demand for high-efficiency wideband digital speech and audio coding technology. The current narrow-band speech bandwidth is usually limited to 200Hz-3400Hz, and the naturalness, intelligibility and music processing of speech are not satisfactory. In recent years, with the rapid development of broadband digital networks, such as third-generation mobile systems, high-speed broadband Internet, etc., have provided a network environment capable of higher quality similar to face-to-face communication. Therefore, wideband speech codec has more practical significance. [0003] Code-excited linear prediction (CELP) has been widely used in narrowband speech coding due to its high coding ef...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/12G10L19/14G10L19/08
Inventor 胡瑞敏张勇刘霖杨玉红高戈王庭红马付伟
Owner HUAWEI TECH CO LTD
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