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US 2022/0277757 A1Published application
Systems and methods for covariance smoothing
AssigneeDolby Laboratories Licensing Corporation
InventorsDavid S. MCGRATH, Stefanie BROWN, Juan Felix TORRES
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Abstract
Methods and systems for improving signal processing by smoothing the covariance matrix of a multi-channel signal by setting a forgetting factor based on the bins of a band. A method and system for resetting the smoothing based on transient detection is also disclosed. A method and system for resampling for the smoothing during a banding transition is also disclosed.
Claims15
A method of smoothing an input covariance matrix for a sequence of signal frames in a frequency band, the method comprising:
- for the signal frames, comparing an effective count of bins in the frequency band to a desired count of bins for the frequency band;
- computing a forgetting factor for the band as a ratio of the effective count to the desired count;
- and
- in response to determining that the effective count of bins in the frequency band is smaller than the desired count, generating a value of a smoothed matrix for a present frame using a previously generated value of the smoothed matrix for a previous frame relative to the present frame and the forgetting factor;
- wherein the comparing, computing, and generating are performed by a system including one or more computer processors.
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Dependencies are inferred from the claim text.