20. The method of claim 19 , wherein determining one or more salient portions of the input window of sound further includes summing the saliency map across frequency channels for each time point in the input window of sound and normalizing the resulting sum to yield a saliency score for each time point in the input window of sound.
19. The method of claim 17 , wherein determining one or more salient portions of the input window of sound further includes summing the normalized maps to provide a bottom-up input to a saliency map.