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Signal denoising method and device and audio decoding system

A signal and decoder technology, applied in the field of audio coding and decoding, can solve the problems of introducing noise, poor auditory effect, mismatching position information, energy information, etc., and achieve the effect of increasing smoothness, reducing noise, and good auditory effect

Active Publication Date: 2011-11-02
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the process of realizing the present invention, the inventor found that the prior art would cause obvious noise and poor auditory effect due to one or more of the following reasons:
[0009] 1. If the BWE spectrum is reserved on the spectrum of the unquantized frequency band, the quantized spectrum and the BWE spectrum preserved on the spectrum of the unquantized frequency band will not match in position information and / or energy information, thus Introduce noise; 2. If a large amount of spectrum is not quantized, and it is set to zero or filled with noise, noise will be directly introduced on the spectrum of the unquantized frequency band
Due to the above mismatch or zeroing and noise filling, some noise will be introduced in the frequency band synthesis after decoding, which will reduce the auditory effect of the audio signal

Method used

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  • Signal denoising method and device and audio decoding system
  • Signal denoising method and device and audio decoding system
  • Signal denoising method and device and audio decoding system

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Embodiment 1

[0024] see image 3 , an embodiment of the present invention provides a signal denoising method, including:

[0025] Step 31, according to the inter-frame correlation of the frame where the spectral coefficient to be adjusted is high or low, select at least two spectral coefficients with high correlation with the spectral coefficient to be adjusted;

[0026] Step 32, using at least two selected spectral coefficients to weight the spectral coefficients to be adjusted to obtain predicted values ​​of the spectral coefficients to be adjusted;

[0027] In step 33, spectrum adjustment is performed on the decoded signal by using the obtained predicted value, and the adjusted decoded signal is output.

[0028] The signal denoising method provided by the embodiment of the present invention obtains the predicted value of the spectral coefficient to be adjusted by weighting at least two related spectral coefficients of the spectral coefficient to be adjusted, and adjusts the decoded sig...

Embodiment 2

[0030] see Figure 4 , a signal denoising method provided by an embodiment of the present invention, comprising:

[0031] Step 41: Determine the spectral coefficient to be adjusted in the decoded signal according to the quantization accuracy of the spectral coefficient.

[0032] At the decoding end, when the core decoder, BWE decoder and dequantization decoder respectively decode the received encoded signal, the decoded signal is output. The decoded signal is the low-frequency signal output by the core decoder and the bandwidth output by the BWE decoder. The extended high-frequency signal and other high-frequency signals output by the dequantization decoder are formed, wherein the bandwidth extended high-frequency signal output by the BWE decoder and other high-frequency signals output by the dequantization decoder are frequency domain signals. The determined spectral coefficients to be adjusted may include: unquantized spectral coefficients, and / or spectral coefficients whos...

Embodiment 3

[0054] This embodiment provides a weighted prediction method for spectral coefficients to be adjusted, and describes the spectrum information that can be used in different weighting modes, including:

[0055] Assumption: The intra-frame spectral information is f_inner[n], the intra-frame weighted weight is w_inner[n], the inter-frame spectral information is f_inter[n], and the inter-frame weighted weight is w_inter[n], where 0≤n≤N , N is the maximum number of frequency points in one frame; if the spectral coefficient of frequency point n is the spectral coefficient to be adjusted, then the predicted value f[n] of the spectral coefficient of frequency point n is represented by a formula such as Equation 1:

[0056] f[n]=w_inner[0]×f_inner[0]+w_inner[1]×f_inner[1]+...+w_inner[N]×f_inner[N]+w_inter[0]×f_inter[0]+w_inter [1]×f_inter[1]+...+w_inter[N]×f_inter[N] Formula 1

[0057] Among them, the intra-frame weight w_inner[n] is proportional to the intra-frame correlation; the int...

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Abstract

The embodiment of the invention discloses a signal denoising method, a signal denoising device and an audio decoding system, which belong to the technical field of audio coding and decoding. The method provided by the embodiment of the invention comprises: selecting at least two spectral coefficients which have high relevance to a spectral coefficient to be adjusted according to the inter-frame relevance of the frame of the spectral coefficient to be adjusted; performing weighting by using the selected at least two spectral coefficients and the spectral coefficient to be adjusted and acquiring a predicted value of the spectral coefficient to be adjusted; and performing the spectral adjustment of a decoded signal by using the acquired predicted value and outputting an adjusted decoded signal. The embodiment of the invention also discloses a signal denoising device and an audio decoding system. Through the embodiment of the invention, the noises generated in frequency synthesis after decoding are reduced, and the auditory effect is improved.

Description

technical field [0001] The present invention relates to the technical field of audio coding and decoding, in particular to a signal denoising method and device and an audio decoding system. Background technique [0002] For many audio codecs with broadband or above, when the code rate is low, the spectrum of the broadband or ultra-wideband part uses BWE (Band Width Extension, bandwidth extension) parameter coding. Guaranteed and acceptable quality; when the code rate is high, the spectrum of the broadband or ultra-wideband part is quantized and encoded. The characteristics of quantized encoding are more bits used, higher precision, and better quality. [0003] Structural diagram reference of an audio codec system supporting wideband or ultra-wideband in the prior art figure 1 and figure 2 . figure 1 It is a structural diagram of an audio coding system supporting wideband or ultra-wideband in the prior art, such as figure 1 As shown, the encoding system adopts a layered ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/02G10L21/02G10L19/04G10L21/0264
Inventor 陈龙吟苗磊胡晨刘泽新张清
Owner HUAWEI TECH CO LTD
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