Patent ID: 6915264
Filing Date: 2005-07-05
Classification: G10L

Abstract:
1. A method for determining a plurality of masked thresholds for a perceptual auditory model based on an input audio signal, the method comprising the steps of: filtering the input audio signal with use of a filter bank comprising a plurality of filter bank stages connected in series, each filter bank stage comprising a plurality of low-pass filters connected in series and a corresponding plurality of high-pass filters applied to a corresponding output from each of said low-pass filters, said filter bank further comprising a plurality of downsamplers connected in series between each successive pair of filter bank stages, each of said high-pass filters comprised in each of said filter bank stages producing a corresponding band-pass signal as an output thereof; and generating, for each of said band-pass signals, a corresponding masked threshold based thereon, wherein each of said band-pass signals has a corresponding center frequency associated therewith, and wherein said center frequencies associated with each of said band-pass signals, when placed in an ascending numerical sequence, are related to one another in accordance with a substantially logarithmic frequency scale and wherein said center frequencies associated with each of said band-pass signals, when placed in said ascending numerical sequence, f