Method and device for decoding signal
First Claim
1. A method for decoding an audio signal, comprising:
- obtaining, by a decoder, an average quantity of allocated bits per spectral coefficient of a sub-band of a current frame of the audio signal;
reconstructing, by the decoder, at least some of a plurality of spectral coefficients of the sub-band to generate reconstructed spectral coefficients when the average quantity of allocated bits per spectral coefficient is less than a classification threshold, wherein the classification threshold is greater than zero;
obtaining, by the decoder, a frequency domain signal according to the reconstructed spectral coefficients; and
generating, by the decoder, a time domain signal based on the frequency domain signal.
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Abstract
A method and device for decoding a signal, where the method for decoding the signal includes obtaining spectral coefficients of sub-bands from a received bitstream by decoding, classifying sub-bands in which the spectral coefficients are located into a sub-band with saturated bit allocation and a sub-band with unsaturated bit allocation, performing noise filling on a spectral coefficient that has not been obtained by decoding and is in the sub-band with unsaturated bit allocation to restore the spectral coefficient that has not been obtained by decoding, and obtaining a frequency domain signal according to the spectral coefficients obtained by decoding and the restored spectral coefficient. Therefore, a sub-band with unsaturated bit allocation in a frequency domain signal may be obtained by classification, thereby improving signal decoding quality.
58 Citations
24 Claims
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1. A method for decoding an audio signal, comprising:
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obtaining, by a decoder, an average quantity of allocated bits per spectral coefficient of a sub-band of a current frame of the audio signal; reconstructing, by the decoder, at least some of a plurality of spectral coefficients of the sub-band to generate reconstructed spectral coefficients when the average quantity of allocated bits per spectral coefficient is less than a classification threshold, wherein the classification threshold is greater than zero; obtaining, by the decoder, a frequency domain signal according to the reconstructed spectral coefficients; and generating, by the decoder, a time domain signal based on the frequency domain signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A decoder for decoding an audio signal, comprising:
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a non-transitory memory for storing computer-executable instructions; and a processor coupled to the non-transitory memory, wherein the processor is configured to execute the computer-executable instructions to; obtain an average quantity of allocated bits per spectral coefficient of a sub-band of a current frame of the audio signal; reconstruct at least some of a plurality of spectral coefficients of the sub-band to generate reconstructed spectral coefficients when the average quantity of allocated bits per spectral coefficient is less than a classification threshold, wherein the classification threshold is greater than zero; and obtain a frequency domain signal according to the reconstructed spectral coefficients; and generate a time domain signal based on the frequency domain signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A decoder for decoding an audio signal, comprising:
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a receiver configured to receive the audio signal; a processor coupled to the receiver and configured to; obtain an average quantity of allocated bits per spectral coefficient of a sub-band of a current frame of the audio signal; reconstruct at least some of a plurality of spectral coefficients of the sub-band to generate reconstructed spectral coefficients when the average quantity of allocated bits per spectral coefficient is less than a classification threshold, wherein the classification threshold is greater than zero; obtain a frequency domain signal according to the reconstructed spectral coefficients; and generate a time domain signal based on the frequency domain signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification