Method and device for decoding signal
First Claim
1. A method for decoding an audio signal, comprising:
- decoding a received bitstream to obtain at least a portion of spectral coefficients of a current frame of the audio signal;
classifying a sub-band of the current frame as a bit allocation un-saturated sub-band, wherein at least one spectral coefficient of the bit allocation un-saturated sub-band has been obtained by decoding the received bitstream and at least one spectral coefficient of the bit allocation un-saturated sub-band has not been obtained by decoding the received bitstream;
reconstructing the at least one spectral coefficient of the bit allocation un-saturated sub-band that has not been obtained by decoding the bitstream by performing noise filling; and
obtaining a frequency domain signal according to the obtained at least the portion of spectral coefficients of the current frame of the audio signal and the reconstructed at least one spectral coefficient of the bit allocation un-saturated sub-band.
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Abstract
A method and device for decoding a signal. The method for decoding a signal includes: obtaining spectral coefficients of sub-bands from a received bitstream by means of 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 means of decoding and is in the sub-band with unsaturated bit allocation, so as to restore the spectral coefficient that has not been obtained by means of decoding; and obtaining a frequency domain signal according to the spectral coefficients obtained by means of 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.
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Citations
20 Claims
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1. A method for decoding an audio signal, comprising:
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decoding a received bitstream to obtain at least a portion of spectral coefficients of a current frame of the audio signal; classifying a sub-band of the current frame as a bit allocation un-saturated sub-band, wherein at least one spectral coefficient of the bit allocation un-saturated sub-band has been obtained by decoding the received bitstream and at least one spectral coefficient of the bit allocation un-saturated sub-band has not been obtained by decoding the received bitstream; reconstructing the at least one spectral coefficient of the bit allocation un-saturated sub-band that has not been obtained by decoding the bitstream by performing noise filling; and obtaining a frequency domain signal according to the obtained at least the portion of spectral coefficients of the current frame of the audio signal and the reconstructed at least one spectral coefficient of the bit allocation un-saturated sub-band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A decoder for decoding an audio signal, comprising:
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a non-transitory memory for storing computer-executable instructions; and a processor operatively coupled to the non-transitory memory, the processor being configured to execute the computer-executable instructions to; decode a received bitstream to obtain at least a portion of spectral coefficients of a current frame of the audio signal; classify a sub-band of the current frame as a bit allocation un-saturated sub-band, wherein at least one spectral coefficient of the bit allocation un-saturated sub-band has been obtained by decoding the received bitstream and at least one spectral coefficient of the bit allocation un-saturated sub-band has not been obtained by decoding the received bitstream; reconstruct the at least one spectral coefficient of the bit allocation un-saturated sub-band that has not been obtained by decoding the bitstream by performing noise filling; and obtain a frequency domain signal according to the obtained at least the portion of spectral coefficients of the current frame of the audio signal and the reconstructed at least one spectral coefficient of the bit allocation un-saturated sub-band. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification