Method for synchronizing computerized audio output with visual output
First Claim
Patent Images
1. Method for controlling synchronization of video and audio signals on a computer, comprising the steps of:
- a. inputting an audio time index value from a input/output device into the computer;
b. initiating a computer interrupt timing sequence in response to said input audio time index value, said computer interrupt timing sequence having a regular periodicity at a first timing rate;
c. reading a video time index value, having a second timing rate different from the first timing rate, the video time index value being read at least once during each regular period of the computer interrupt timing sequence, the video time index value being read from a data file into at least one memory register of the computer;
d. playing the audio signals from the input/output device such that the audio signals are audible to the human ear;
e. comparing the audio time index value to the video time index value during each regular period of the computer interrupt timing sequence; and
f. displaying a video signal mapped at the video time index value in response to an audio time index value which is greater than or equal to the video time index value, such that said video signal is synchronized to said played audio signals.
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Abstract
The inventive method is a method for synchronizing computerized video images with an audio output. The audio output may be in the form of an audio track stored on a compact disk. The synchronization method uses a timing index which corresponds to the audio track on the compact disk. The computer repeatedly reads the audio timing index and compares it to a data table of known video timing codes. Each time the compact disk timing index is read and determined to be greater than or equal to the current value from the data table the next video image is shown.
25 Citations
19 Claims
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1. Method for controlling synchronization of video and audio signals on a computer, comprising the steps of:
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a. inputting an audio time index value from a input/output device into the computer; b. initiating a computer interrupt timing sequence in response to said input audio time index value, said computer interrupt timing sequence having a regular periodicity at a first timing rate; c. reading a video time index value, having a second timing rate different from the first timing rate, the video time index value being read at least once during each regular period of the computer interrupt timing sequence, the video time index value being read from a data file into at least one memory register of the computer; d. playing the audio signals from the input/output device such that the audio signals are audible to the human ear; e. comparing the audio time index value to the video time index value during each regular period of the computer interrupt timing sequence; and f. displaying a video signal mapped at the video time index value in response to an audio time index value which is greater than or equal to the video time index value, such that said video signal is synchronized to said played audio signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Method for synchronization of digitally recorded video and audio signals, comprising the steps of:
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a. constructing a data table having a plurality of first time index values based upon a first sampling rate of an audio signal source and a plurality of second time index values based upon a second sampling rate of a video signal source, the first and second sampling rates being different from one another, a plurality of musical notes in a melody line each mapped to a first time index value and a corresponding second time index value and a plurality of video display units each mapped to a first time index value, a corresponding second time index value and a musical note; b. writing said constructed data table to a computer-readable medium; c. reading one of said first time index values from the constructed written data table on the computer-readable medium; d. initiating a timing sequence corresponding to the second sampling rate in response to the first audio time index value, the first timing sequence having a regular periodicity; e. reading a first of the plurality of musical notes and a first of the plurality of video display units having the second time index value, the second time index value being read at least once during each regular period of the timing sequence; f. comparing the second time index value read for the musical note with the second time index value read for the video display unit; and g. displaying on a computer display, the video display unit having a read second time index value greater than or equal to the second time index value for the musical note read during the same regular period of the timing sequence. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification