Audio to video timing equalizer method and apparatus
DCFirst Claim
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1. A delay system for an audio signal and a video signal comprising:
- a timing encoder which develops a combination signal that includes said video signal and timing information generated from said audio signal;
a delay decoder responsive to said combination signal and to said audio signal, said delay decoder being operative to develop a delay signal representing the relative delay time between said combination signal and said audio signal by comparing the timing information of said combination signal with said audio signal; and
a delay generator responsive to said delay signal and operative to delay the least delayed of said combination signal and said audio signal by said relative delay time to resynchronize said combination signal with said audio signal.
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Abstract
A method and apparatus for transmitting and resynchronizing audio and video signals characterized by the encoding of audio timing signals on the video signal prior to transmission, and the decoding of the audio timing signals from the video signal after transmission. The decoded audio timing signals are compared to timing signals generated from the transmitted audio signal, and a delay factor is generated to represent the relative delay between the transmitted audio signal and the transmitted video signal. Either the transmitted video signal or the transmitted audio signal is then delayed by the amount of the delay factor to resynchronize the two signals.
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Citations
34 Claims
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1. A delay system for an audio signal and a video signal comprising:
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a timing encoder which develops a combination signal that includes said video signal and timing information generated from said audio signal; a delay decoder responsive to said combination signal and to said audio signal, said delay decoder being operative to develop a delay signal representing the relative delay time between said combination signal and said audio signal by comparing the timing information of said combination signal with said audio signal; and a delay generator responsive to said delay signal and operative to delay the least delayed of said combination signal and said audio signal by said relative delay time to resynchronize said combination signal with said audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 16, 17, 18)
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8. A delay system for an audio signal and a video signal comprising:
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a timing encoder which develops a combination signal that includes said video signal and timing information generated from said audio signal; a delay decoder responsive to said combination signal and to said audio signal, said delay decoder being operative to develop a delay signal representing the relative delay time between said combination signal and said audio signal by comparing the timing information of said combination signal with said audio signal; and a delay generator responsive to said delay signal and operative to delay said audio signal by said relative delay time to resynchronize said combination signal with said audio signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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19. A transmission system for an audio signal and a video signal comprising:
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video transmission means having an originating node and a terminating node; audio transmission means having an originating node and a terminating node, said audio signal being applied to said originating node of said audio transmission means; a timing encoder responsive to said video signal and to said audio signal, said timing encoder being operative to develop a combination signal which is applied to said originating node of said video transmission means; a delay decoder responsive to a transmitted combination signal developed at said terminating node of said video transmission means, and to a transmitted audio signal developed at said terminating node of said audio transmission means, said delay decoder being operative to develop a delay signal by comparing said transmitted combination signal and said transmitted audio signal; a delay generator responsive to said delay signal, and to the earlier arriving of said transmitted combination signal and said transmitted audio signal, said delay generator being operative to delay said earlier arriving signal. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method for transmitting and synchronizing audio and video signals comprising:
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generating timing information from an audio input signal; combining said timing information with a video input signal to create a combination signal; transmitting said combination signal; transmitting said audio input signal; determining the relative delay between said transmitted combination signal and said transmitted audio input signal by comparing the timing information of said transmitted combination signal with said transmitted audio input signal; and delaying at least one of said transmitted combination signal and said transmitted audio signal by the amount of said relative delay.
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27. A method for transmitting and synchronizing a collection of audio signals including a first audio signal with a video signal comprising:
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generating timing information from the first audio signal of said collection of audio signals; combining said information with a video input signal to create a combination signal; transmitting said combination signal to create a transmitted combination signal; transmitting said collection of audio signals to create a transmitted collection of audio signals including said first audio signal; determining the relative delay between said transmitted combination signal and said transmitted first audio input signal by comparing the timing information of said transmitted combination signal with said transmitted first audio input signal; and delaying at least one of said transmitted combination signal and said transmitted collection of audio signals by the amount of said relative delay.
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28. A method for transmitting and synchronizing a plurality of audio signals with a video signal comprising:
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generating timing information from each of said plurality of audio signals; combining said timing information with a video input signal to create a combination signal; transmitting said combination signal to create a transmitted combination signal; transmitting said plurality of audio signals to create a plurality of transmitted audio signals; determining the relative delay between said transmitted combination signal and each of said plurality of transmitted audio signals by comparing the timing information of said transmitted combination signal with each of said plurality of transmitted audio signals; and delaying each of said plurality of transmitted audio signals by its relative delay.
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29. A method for resynchronizing an audio signal and a video signal comprising:
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encoding said video signal with timing information from said audio signal; delaying said audio and said video signals; decoding said timing information from said encoded video signal after said video signal has been delayed; comparing said decoded timing information with said audio signal after said audio signal has been delayed to develop a delay factor; and delaying the least delayed of said delayed audio signal and said delayed video signal by the amount of said delay factor.
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30. A delay system for an audio signal and a video signal comprising:
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timing encoder means having as inputs said audio signal and said video signal, said timing encoder means combining said video signal and timing information derived from said audio signal to produce an output; video recording means coupled to said output of said timing encoder means, said video recording means having a video playback output; audio recording means having an audio input coupled to said audio signal, an audio speed control input, and an audio playback output; delay decoder means responsive to said video playback output and to said audio playback output and operative to develop an audio speed control signal which is coupled to said audio speed control input to synchronize said audio playback output with said video playback output. - View Dependent Claims (31)
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32. A transmission system for an audio signal and a video signal comprising:
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video transmission means having an originating node and a terminating node; audio transmission means having an originating node and a terminating node, said audio signal being applied to said originating node of said audio transmission means; a timing encoder responsive to said video signal and to said audio signal, said timing encoder being operative to develop a combination signal which is applied to said originating node of said video transmission means; a delay decoder reponsive to a transmitted combination signal developed at said terminating node of said video transmission means, and to a transmitted audio signal developed at said terminating node of said audio transmission means, said delay decoder being operative to develop a delay signal by comparing said transmitted combination signal and said transmitted audio signal; and wherein one of said audio or video transmission means has a delay, said delay having a variable length, and said variable length of said delay being responsive to said delay signal.
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33. A delay equalizing system for an audio signal and an associated video signal comprising:
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a timing encoder which develops a combination signal derived from said video signal and timing information generated from said audio signal; a delay decoder responsive to said combination signal and to said audio signal, one of which signals may have been delayed relative to the other, said delay decoder being operative to control a delay generator in response to the relative delay time between sid combination signal and said audio signal by comparing the timing information of said combination signal with said audio signal; and a delay generator responsive to said delay decoder and operative to delay the least delayed of said combination signal and said audio signal by said relative delay time to synchronize said combination signal and said audio signal.
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34. A delay equalizing system for an audio signal and an associated video signal comprising:
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a timing encoder which develops a combination signal derived from said video signal and timing information generated from said audio signal; a delay decoder responsive to said combination signal and to said audio signal, one of which signals may have been delayed relative to the other, said delay decoder being operative to develop a delay signal representing the relative delay time, if any, between said combination signal and said audio signal by comparing the timing information of said combination signal with said audio signal; and said delay generator responsive to said delay signal and operative to delay the least delayed of said combination signal and said audio signal by said relative delay time to synchronize said combination signal and said audio signal.
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Specification