Digital data transmission arrangement using a standard TV video
First Claim
1. A digital data TV transmission system for transmitting an encoded video signal within a standard video transmission signal comprising:
- means for deriving a first clock signal which is an integral multiple or submultiple of the color subcarrier frequency;
means for deriving a second clock signal which is an integral multiple or submultiple of the color subcarrier frequency and which has a frequency less than or equal to the value of the frequency of the first clock signal;
data signal input means for providing digital signals for controlling red, green and blue excitation levels of a television signal;
luminance signal means for providing a signal corresponding to the luminance of a television signal;
encoding means responsive to said data signal means and said second clock signal means for providing modulated red, green and blue chrominance signals;
means responsive to said luminance signal and said first clock signal for providing a modulated luminance signal;
means for combining the modulated luminance signal and the modulated chrominance signals for providing an encoded video output signal; and
synchronized switching means for inserting said encoded video output signal during a selected portion of a standard video transmission signal.
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Accused Products
Abstract
An arrangement for providing digital encoding and decoding of information, which encoding is performed on a standard TV video signal, is disclosed. The encoding scheme utilizes the four standard signals R, G, B, Y which are available from any color transmission system. These four signals are the luminance information, Y, the red chroma excitation level, R, the green chroma excitation level, G, and the blue chroma excitation level, B. The encoding arrangement utilizes the color subcarrier (3.579545 MHz) as a reference to derive a clock at 1/3 of the subcarrier frequency and a clock at 1/6 of the subcarrier frequency. Clocks at these frequencies are used to modulate the luminance and the chroma information. Apparatus for encoding and synchronized decoding are disclosed. The suggested portion, in the television signal, for the encoded data is within the vertical interval.
116 Citations
14 Claims
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1. A digital data TV transmission system for transmitting an encoded video signal within a standard video transmission signal comprising:
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means for deriving a first clock signal which is an integral multiple or submultiple of the color subcarrier frequency; means for deriving a second clock signal which is an integral multiple or submultiple of the color subcarrier frequency and which has a frequency less than or equal to the value of the frequency of the first clock signal; data signal input means for providing digital signals for controlling red, green and blue excitation levels of a television signal; luminance signal means for providing a signal corresponding to the luminance of a television signal; encoding means responsive to said data signal means and said second clock signal means for providing modulated red, green and blue chrominance signals; means responsive to said luminance signal and said first clock signal for providing a modulated luminance signal; means for combining the modulated luminance signal and the modulated chrominance signals for providing an encoded video output signal; and synchronized switching means for inserting said encoded video output signal during a selected portion of a standard video transmission signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for transmitting encoded digital data in a standard color television video signal comprising:
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means for providing up to three digital data input signals; means, synchronized with the color subcarrier, for modulating red, green and blue chrominance signals with corresponding ones of said data input signals; means, synchronized with the color subcarrier, for modulating a luminance signal; means for combining said modulated chrominance signals and modulated luminance signal to provide an encoded video output signal; and means for inserting said encoded video output signal during a selected portion of a standard video signal. - View Dependent Claims (10, 11)
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12. A system for transmitting encoded digital data in a standard color television video signal comprising:
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means for providing up to three digital data input signals; means for providing a clock frequency signal; means, synchronized with the clock frequency, for modulating red, green and blue chrominance signals with corresponding ones of said data input signals; means, synchronized with the clock frequency for modulating a luminance signal; means for combining said modulated chrominance and modulated luminance signal to provide an encoded video output signal; and means for inserting said encoded video output signal during a selected portion of a standard video signal. - View Dependent Claims (13, 14)
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Specification