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 hearing effect, mismatch of position information and energy information, etc., and achieve the effect of increasing smoothness, reducing noise, and good hearing effect.
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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 inter-f...
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