Patent ID: 7126663

Claim:
A method for reducing sound track sibilance distortion during playback of an analog optical sound track, comprising the steps of: a) forming an image of said analog optical sound track; b) storing said image; c) representing part of said stored image as a spatial image; d) erosion filtering said spatial image to reduce image spread distortion of the optical sound track envelope; e) converting said filtered spatial image to a signal representative of said sound track, said converting comprising: reviewing an audio quality of said signal representative of said sound crack formed from said repeated steps, said reviewing including at least one of assessing sibilance distortion in said sound track, and assessing cross modulation distortion in said sound track; and, selecting one of no further erosion filtering and a different amount of erosion filtering of said spatial image based on said assessing; repeating steps c), d) and e) filter said stored image of said analog optical sound track.