Method and apparatus for adaptive control of decorrelation filters
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsTomas Jansson Toftgård, Tommy Falk
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Abstract
An audio signal processing method and apparatus for adaptively adjusting a decorrelator. The method comprises obtaining a control parameter and calculating mean and variation of the control parameter. Ratio of the variation and mean of the control parameter is calculated, and a decorrelation parameter is calculated based on the said ratio. The decorrelation parameter is then provided to a decorrelator.
Claims20
An audio signal processing method performed by an audio decoder for adaptive adjustment of decorrelation, the method comprising:
- receiving a control parameter;
- estimating mean of the control parameter;
- estimating variation of the control parameter;
- determining a ratio of the variation and mean of the control parameter;
- and
- calculating a targeted decorrelation filter length based on said ratio.
An audio decoder for adaptive adjustment of decorrelation, the audio decoder comprising:
- processing circuitry;
- and
- a memory, the memory containing instructions executable by the processing circuitry, whereby the audio decoder is operative to:
- receive a control parameter;
- estimate mean of the control parameter;
- estimate variation of the control parameter;
- determine a ratio of the variation and mean of the control parameter;
- and
- calculate a targeted decorrelation filter length based on said ratio.
A computer program product comprising a non-transitory computer readable medium storing instructions which when executed by processing circuitry cause the processing circuitry to:
- receive a control parameter;
- estimate mean of the control parameter;
- estimate variation of the control parameter;
- determine a ratio of the variation and mean of the control parameter;
- and
- calculate a targeted decorrelation filter length based on said ratio.
Dependencies are inferred from the claim text.