NuHAG :: TALKS

Talks given at NuHAG events

Time-Frequency Sparsity By Irrelevance Using a Simultaneous Masking Model


  Peter Balazs

  given at  mulac10 (12.04.10 10:45)
  id:  1633
  length:  30min
  status:  accepted
  type:  talk
  LINK-Presentation: 
  ABSTRACT:
We present an algorithm for removing time-frequency components, found by a standard Gabor transform, of a ``real-world'' sound while causing no audible difference to the original sound after resynthesis. Thus this representation is made sparser. The selection of removable components is based on a simple model of simultaneous masking in the auditory system. Important goals were the applicability to any real-world music and speech sound, integrating mutual masking effects between time-frequency components, coping with the time-frequency spread of such an operation, and computational efficiency. The proposed algorithm first determines an estimation of the masked threshold within an analysis window. The masked threshold function is then shifted in level by an amount determined experimentally, and all components falling below this function (the irrelevance threshold) are removed.
This shift gives a conservative way to deal with uncertainty effects resulting from removing time-frequency components and with inaccuracies in the masking model. The removal of components is described as an adaptive Gabor multiplier. Thirty-six normal hearing subjects participated in an experiment to determine the maximum shift value for which they could not discriminate the irrelevance filtered signal from the original signal. On average across the test stimuli, 36 percent of the time-frequency components fell below the irrelevance threshold.


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