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Transmission of audio in a video signal

  • US 4,983,967 A
  • Filed: 10/14/1988
  • Issued: 01/08/1991
  • Est. Priority Date: 10/16/1987
  • Status: Expired due to Fees
First Claim
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1. A method of encoding an audio signal onto and decoding an audio signal from a video signal, the method comprising the encoding steps of;

  • (A) encoding an audio signal onto a video signal, comprising the steps of;

    (1) sampling successive portions of the audio signal;

    (2) time compressing the sampled audio signal portions;

    (3) inserting successive ones of the time compressed audio signal portions in analogue form into predetermined lines of the video signal; and

    (4) inserting distortion cancelling signals into further predetermined lines of the video signal, each distortion cancelling signal being associated with a respective audio signal portion; and

    thereafter(B) decoding the audio signal from the video signal, comprising the steps of;

    (1) separating the successive time compressed audio signal portions and the distortion cancelling signals from the video signal;

    (2) storing successive ones of the audio signal portions;

    (3) storing successive ones of the distortion cancelling signals;

    (4) adding associated ones of the stored audio signal portions and distortion cancelling signals in inverted form relative to one another such that perturbations present in the associated signals will cancel to zero; and

    (5) time expanding and re-assembling the audio signal portions.

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