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US 2020/0005803 A1Published application
Post-Quantization Gain Correction in Audio Coding
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsErik Norvell, Volodya Grancharov
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Abstract
A gain adjustment apparatus for use in decoding of audio that has been encoded with separate gain and shape representations includes an accuracy meter configured to estimate an accuracy measure of the shape representation, and to determine a gain correction based on the estimated accuracy measure. An envelope adjuster further included in the apparatus is configured to adjust the gain representation based on the determined gain correction.
Claims16
A method of operation by a gain adjustment apparatus, the method comprising:
- receiving an encoded audio signal comprising a set of gain values and a corresponding set of shape vectors, each gain value representing the energy of a frequency sub-band in a frequency transform of an input audio signal, and each corresponding shape vector representing a fine structure of the frequency transform in the frequency sub-band;
- determining an accuracy measure for each shape vector from corresponding shape quantization characteristics indicating a quantization resolution;
- determining a gain correction for each gain value as a function of the accuracy measure calculated for the corresponding shape vector;
- and
- adjusting each gain value according to the corresponding gain correction, to obtain corrected gain values, for use in decoding the encoded audio signal.
2 more elements
A gain adjustment apparatus comprising:
- input circuitry configured to receive an encoded audio signal comprising a set of gain values and a corresponding set of shape vectors, each gain value representing the energy of a frequency sub-band in a frequency transform of an input audio signal, and each corresponding shape vector representing a fine structure of the frequency transform in the frequency sub-band;
- and
- gain correction circuitry configured to:
- determine an accuracy measure for each shape vector from corresponding shape quantization characteristics indicating a quantization resolution;
- determine a gain correction for each gain value as a function of the accuracy measure calculated for the corresponding shape vector;
- and
- adjust each gain value according to the corresponding gain correction, to obtain corrected gain values, for use in decoding the encoded audio signal.
4 more elements
Dependencies are inferred from the claim text.