System and method for in-band A/V timing measurement of serial digital video signals
First Claim
1. A computer-implemented method for characterizing a relative offset in time between audio and video signals, the method comprising:
- generating in-band characterization data for synchronized audio and video signals associated with each frame in a sequence of frames, wherein the in-band characterization data represents a fingerprint of a portion of the synchronized audio and video signals, and wherein a portion of the synchronized audio and video signals comprises each scanline of video data and audio data for each frame in the sequence of frames;
inserting the characterization data for the synchronized audio and video signals into a vertical ancillary (VANC) space of a signal that includes video and audio signals for each frame in the sequence of frames; and
transmitting the signal to a receiver that is configured to reproduce the synchronized audio and video signals associated with each frame in the sequence of frames.
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Accused Products
Abstract
A system and method for characterizing the relative offset in time between audio and video signals and enables the receiver of the audio and video signals to resynchronize the audio and video signals. Signal characterization data is dynamically captured and encoded into frames of video and audio data that is output by a television origination facility. The signal characterization data is extracted by the receiver and signal characterization data is recomputed for the received frames. The extracted signal characterization data is compared with the recomputed signal characterization data to compute the relative offset in time between the video and one or more audio signals for a frame. The receiver may then resynchronize the video and audio signals using the computed relative offset.
16 Citations
20 Claims
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1. A computer-implemented method for characterizing a relative offset in time between audio and video signals, the method comprising:
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generating in-band characterization data for synchronized audio and video signals associated with each frame in a sequence of frames, wherein the in-band characterization data represents a fingerprint of a portion of the synchronized audio and video signals, and wherein a portion of the synchronized audio and video signals comprises each scanline of video data and audio data for each frame in the sequence of frames; inserting the characterization data for the synchronized audio and video signals into a vertical ancillary (VANC) space of a signal that includes video and audio signals for each frame in the sequence of frames; and transmitting the signal to a receiver that is configured to reproduce the synchronized audio and video signals associated with each frame in the sequence of frames. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer-implemented method for characterizing a relative offset in time between audio and video signals, the method comprising:
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receiving, from a television origination facility, a sequence of frames including video and audio signals as well as in-band characterization data associated with each scanline of video data and audio data for each frame in the sequence of frames that is transmitted using in-band signals; extracting the in-band characterization data from the sequence of frames; recomputing characterization data for each scanline of video data and audio data for each frame in the sequence of frames based on the video and audio signals to produce recomputed characterization data; and comparing the recomputed characterization data for each scanline of video data and audio data for each frame with the extracted in-band characterization data to determine the relative offset in time between the audio and video signals for the sequence of frames. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A system for characterizing a relative offset in time between audio and video signals, the system comprising:
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a frame storage configured to; receive, from a television origination facility, a sequence of frames including video and audio signals as well as in-band characterization data associated with each scanline of video data and audio data for each frame in the sequence of frames; and store at least a portion of the frames in the sequence of frames; a receiver coupled to the frame storage and configured to; extract the in-band characterization data from the sequence of frames; recompute characterization data for each scanline of video data and audio data for each frame in the sequence of frames based on the video and audio signals; and compare the recomputed characterization data for each scanline of video data and audio data for each frame in the sequence of frames with the extracted in-band characterization data to determine the relative offset in time between the audio and video signals for the sequence of frames. - View Dependent Claims (16, 17)
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18. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause a computer system to characterize a relative offset in time between audio and video signals, by performing the steps of:
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receiving, from a television origination facility, a sequence of frames including video and audio signals as well as in-band characterization data associated with each scanline of video data and audio data for each frame in the sequence of frames that is transmitted using in-band signals; extracting the characterization data from the sequence of frames; recomputing characterization data for each scanline of video data and audio data for each frame in the sequence of frames based on the video and audio signals to produce recomputed characterization data; and comparing the recomputed characterization data for each scanline of video data and audio data for each frame in the sequence of frames with the extracted characterization data to determine the relative offset in time between the audio and video signals for the sequence of frames. - View Dependent Claims (19, 20)
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Specification