VARIABLE RATE VIDEO PLAYBACK WITH SYNCHRONIZED AUDIO
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Abstract
The invention enables the apparent display rate of an audiovisual display to be varied. The invention can modify an original set of audio data in accordance with a target display rate, then modify a related original set of video data to conform to the modifications made to the audio data set, such that the modified audio and video data sets are synchronized. When the modified audio and video data sets so produced are used to generate an audiovisual display, the audiovisual display has an apparent display rate that approximates the target display rate. The target display rate can be faster or slower than a normal display rate at which an audiovisual display system generates an audiovisual display from the original sets of audio and video data. The target display rate can be established solely by a user instruction, by analysis of the audiovisual data, or by modification of a user-specified nominal target display rate based upon analysis of the audiovisual data. Preferably, the method for modifying the original audio data set is one that produces a modified audio data set that can be used to generate an audio display having little or no distortion.
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Citations
33 Claims
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1-14. -14. (canceled)
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15. A computer readable storage medium containing instructions for controlling a computer to synchronize a video data sequence to a set of audio data, by a method comprising:
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defining a correspondence between an original audio data sequence and an original video data sequence, wherein the original audio data sequence and the original video data sequence are synchronized at a normal display rate; determining a target display rate that differs from the normal display rate; creating a modified audio data sequence that corresponds to the original audio data sequence, wherein the modified audio data sequence is created based at least in part on the target display rate; establishing a correspondence between the modified audio data sequence and the original video data sequence; creating a modified video data sequence that corresponds to the original video data sequence, based on the modified audio data sequence and the correspondence between the modified audio data sequence and the original video data sequence, wherein the modified video data sequence is synchronized with the modified audio data sequence; generating an audio display from the modified audio data sequence; and generating a video display from the modified video data sequence. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An apparatus for synchronizing a set of video data to a set of audio data that is being played at a variable rate, the apparatus comprising:
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a means for defining a correspondence between an original set of audio data and an original set of video data such that the original set of audio data and the original set of video data are synchronized at a normal display rate; a means for determining a target display rate that differs from the normal display rate; a means for creating a modified set of audio data that corresponds to the original set of audio data, wherein the modified set of audio data is created based at least in part on the target display rate; a means for establishing a correspondence between the modified set of audio data and the original set of video data; a means for creating a modified set of video data that corresponds to the original set of video data, based on the modified set of audio data and the correspondence between the modified set of audio data and the original set of video data, such that the modified set of video data is synchronized with the modified set of audio data; and a means for outputting for display on a computing or display device the modified set of video data. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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Specification