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US 12,711,966 B2Granted
Method and device for decoding signals
AssigneeHuawei Technologies Co., Ltd.
InventorsZexin Liu, Fengyan Qi, Lei Miao
Life of this patent
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Abstract
In a method to decode signals, a computing device decodes spectral coefficients of a current frame are grouped into a plurality of sub-bands. The computing device classifies a sub-band as a bit allocation unsaturated sub-band based on an average quantity of allocated bits per spectral coefficient of a sub-band of the plurality of sub-bands and a threshold. The computing device obtains a noise filling gain based on an envelope of the sub-band, and obtains a reconstructed spectral coefficient of the sub-band by performing noise filling based on the noise filling gain. The computing device then obtains a frequency domain audio signal based on spectral coefficients in the sub-band obtained by decoding and the reconstructed spectral coefficient.
Claims3
A method comprising:
- 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, including:
- comparing an average quantity of allocated bits per spectral coefficient with a first threshold, wherein an average quantity of allocated bits per spectral coefficient of one sub-band is a ratio of a quantity of bits allocated for the one sub-band to a quantity of spectral coefficients in the one sub-band, wherein a sub-band whose average quantity of allocated bits per spectral coefficient is greater than or equal to the first threshold is classified as the sub-band with saturated bit allocation, and a sub-band whose average quantity of allocated bits per spectral coefficient is less than the first threshold is classified as the 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, to reconstruct the spectral coefficient that has not been obtained by means of decoding, including:
- comparing an average quantity of allocated bits per spectral coefficient with a second threshold, wherein the second threshold is less than the first threshold;
- calculating a harmonic parameter of a sub-band whose average quantity of allocated bits per spectral coefficient is greater than or equal to the second threshold, wherein the harmonic parameter represents harmonic strength or weakness of a frequency domain signal;
- and
- performing, based on the harmonic parameter, noise filling on the spectral coefficient that has not been obtained by means of decoding and is in the sub-band with unsaturated bit allocation;
- and
- obtaining a frequency domain signal according to the spectral coefficients obtained by means of decoding and the reconstructed spectral coefficient.
7 more elements
An apparatus comprising:
- a memory storing computer executable instructions;
- and
- a processor configured to execute the computer executable instructions to:
- obtain spectral coefficients of sub-bands from a received bitstream by means of decoding;
- classify, based on an average quantity of allocated bits per spectral coefficient, 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, including:
- compare an average quantity of allocated bits per spectral coefficient with a first threshold, wherein an average quantity of allocated bits per spectral coefficient of one sub-band is a ratio of a quantity of bits allocated for the one sub-band to a quantity of spectral coefficients in the one sub-band, wherein a sub-band whose average quantity of allocated bits per spectral coefficient is greater than or equal to the first threshold is classified as the sub-band with saturated bit allocation, and a sub-band whose average quantity of allocated bits per spectral coefficient is less than the first threshold is classified as the sub-band with unsaturated bit allocation;
- perform 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 to reconstruct the spectral coefficient that has not been obtained by means of decoding, including:
- compare an average quantity of allocated bits per spectral coefficient with a second threshold, wherein the second threshold is less than the first threshold;
- calculate a harmonic parameter of a sub-band whose average quantity of allocated bits per spectral coefficient is greater than or equal to the second threshold, wherein the harmonic parameter represents harmonic strength or weakness of a frequency domain signal;
- and
- perform, based on the harmonic parameter, noise filling on the spectral coefficient that has not been obtained by means of decoding and is in the sub-band with unsaturated bit allocation;
- and
- obtain a frequency domain signal according to the spectral coefficients obtained by means of decoding and the reconstructed spectral coefficient.
10 more elements
A non-transitory computer-readable storage medium having stored thereon computer executable instructions that, when executed by a processor of a computing apparatus, cause the computing apparatus to perform operations of:
- 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, including:
- comparing an average quantity of allocated bits per spectral coefficient with a first threshold, wherein an average quantity of allocated bits per spectral coefficient of one sub-band is a ratio of a quantity of bits allocated for the one sub-band to a quantity of spectral coefficients in the one sub-band, wherein a sub-band whose average quantity of allocated bits per spectral coefficient is greater than or equal to the first threshold is classified as the sub-band with saturated bit allocation, and a sub-band whose average quantity of allocated bits per spectral coefficient is less than the first threshold is classified as the 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, to reconstruct the spectral coefficient that has not been obtained by means of decoding, including:
- comparing an average quantity of allocated bits per spectral coefficient with a second threshold, wherein the second threshold is less than the first threshold;
- calculating a harmonic parameter of a sub-band whose average quantity of allocated bits per spectral coefficient is greater than or equal to the second threshold, wherein the harmonic parameter represents harmonic strength or weakness of a frequency domain signal;
- and
- performing, based on the harmonic parameter, noise filling on the spectral coefficient that has not been obtained by means of decoding and is in the sub-band with unsaturated bit allocation;
- and
- obtaining a frequency domain signal according to the spectral coefficients obtained by means of decoding and the reconstructed spectral coefficient.
7 more elements
Dependencies are inferred from the claim text.