Variable area film soundtrack renovation
AssigneeTechnicolor, Inc.
InventorsJaime Arturo Valenzuela, Vincent Richard Williams
Life of this patent
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Abstract
A method for reducing sound track sibilance distortion during playback of an analog optical sound track. The method comprises the steps of forming and storing an image of the analog optical sound track. Representing part of the stored image as a spatial image and applying an erosion filter to the spatial image. Converting the filtered spatial image to a signal representative of the sound track.
Claims11
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.
A method for reducing audio distortion resulting from image spreading in an analog optical sound track, comprising the steps of:
- a) forming an image of said analog optical sound track with image spreading;
- b) storing said image;
- c) quantizing said stored image to have a first digital value representing audio modulation present on said analog optical sound track and to have a second digital value representing said analog optical sound track without said audio modulation;
- d) representing part of said quantized stored image as a spatial image;
- e) selectively changing said first digital value to said second digital value for a specific pixel of said quantized stored image represented as a spatial image;
- and,
- f) converting said spatial image with said selectively changed pixel value to a signal representative of said audio modulation present on said sound track.
Dependencies are inferred from the claim text.