Method and device for decoding signal
First Claim
1. A method for decoding an audio signal, comprising:
- receiving a bitstream including a plurality of spectral coefficient parameters;
obtaining, based on the spectral coefficient parameters, spectral coefficients of a current frame of the audio signal by decoding the received bitstream;
classifying a sub-band of the current frame as a bit allocation un-saturated sub-band;
restoring a spectral coefficient associated with the hit allocation un-saturated sub-band by performing noise filling; and
obtaining a frequency domain signal according to the obtained spectral coefficients and the restored spectral coefficient, associated with 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.
34 Citations
22 Claims
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1. A method for decoding an audio signal, comprising:
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receiving a bitstream including a plurality of spectral coefficient parameters; obtaining, based on the spectral coefficient parameters, spectral coefficients of a current frame of the audio signal by decoding the received bitstream; classifying a sub-band of the current frame as a bit allocation un-saturated sub-band; restoring a spectral coefficient associated with the hit allocation un-saturated sub-band by performing noise filling; and obtaining a frequency domain signal according to the obtained spectral coefficients and the restored spectral coefficient, associated with the bit allocation un-saturated sub-band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for decoding an audio signal, comprising:
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a receiver configured to receive a bitstream including a plurality of spectral coefficient parameters; a decoder coupled to the receiver and configured to obtain spectral coefficients of a current frame of the audio signal, based on the spectral coefficient parameters, by decoding the received bitstream; and a processor coupled to the decoder and configured to; classify a subband of the current frame as a bit allocation un-saturated sub-band restore a spectral coefficient associated with the bit allocation un-saturated sub-band by performing noise filling obtain a frequency domain signal according to the obtained spectral coefficients and the restored spectral coefficient associated with the bit allocation un-saturated sub-band. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer readable storage medium, tangibly embodying computer program code, which, when executed by a processor, causes the processor to:
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receive a bitstream including a plurality of spectral coefficient parameters; obtain spectral coefficients of a current frame of the audio signal based on the spectral coefficient parameters, by decoding the received bitstream; classify a sub-band he current frame as a bit allocation un-saturated sub-band;
restore a spectral coefficient associated with e bit allocation un-saturated sub-band by performing noise filling; andobtain a frequency domain signal according to the obtained spectral coefficients and the restored spectral coefficient associated with the bit allocation un-saturated sub-band. - View Dependent Claims (20, 21, 22)
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Specification