Method of coding audio and video signals
First Claim
1. Means for coding video and audio signals including means for deriving clock and internal timing signals from the video signal, means controlled by said internal timing signals for providing digital data representation of the audio signal,means for suppressing the video signal during horizontal blanking intervals, means for inserting the digital audio data in pulse form into the suppressed horizontal blanking intervals, and means for applying a changing voltage level to the video signal and audio data pulses during the horizontal blanking intervals to enhance video signal coding.
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Abstract
An audio and video signal coding system in which the normal sync pulses in the horizontal and vertical blanking intervals are suppressed, and clock and control data as well as digital audio data is inserted therein. The data, both audio information and clock data in the horizontal blanking interval is further distorted by the application of a periodic waveform and/or voltage level enhancement of certain portions of the horizontal blanking interval.
135 Citations
11 Claims
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1. Means for coding video and audio signals including means for deriving clock and internal timing signals from the video signal, means controlled by said internal timing signals for providing digital data representation of the audio signal,
means for suppressing the video signal during horizontal blanking intervals, means for inserting the digital audio data in pulse form into the suppressed horizontal blanking intervals, and means for applying a changing voltage level to the video signal and audio data pulses during the horizontal blanking intervals to enhance video signal coding.
- 9. Means for coding video signals including means for suppressing the video signal during horizontal blanking intervals, means for inserting data pulses into the suppressed horizontal blanking intervals, and means for applying a changing voltage level to the video signal and data pulses during the horizontal blanking intervals to enhance video signal coding.
Specification