Circuit for including a copy-inhibit signal with a video signal
First Claim
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1. A video signal recording apparatus, comprising:
- an input terminal for receiving a video signal;
recording means for recording said video signal on a recording medium;
detecting means for detecting a copy-inhibit signal combined with said video signal and having a frequency substantially equal to (N+(1/2)·
fh±
fv/2, where N is an integer, fh is a horizontal frequency of said video signal and fv is a vertical frequency of said video signal; and
control means for inhibiting operation of said recording means upon detection of said copy-inhibit signal by said detecting means.
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Abstract
A spurious signal SSP whose frequency spectrum is located at frequencies [(N+(1/2))·fh] is multiplexed with a luminance signal Y so as to keep an interleaved relation between the spurious signal SSP and the luminance signal Y and the resultant signal is transmitted. When the spurious signal SSP is detected, the recording operation is inhibited. The spurious signal SSP is multiplexed with the luminance signal Y at a level such as not to exert an influence on the picture quality when the video signal is reproduced and seen by a monitor screen.
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Citations
3 Claims
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1. A video signal recording apparatus, comprising:
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an input terminal for receiving a video signal; recording means for recording said video signal on a recording medium; detecting means for detecting a copy-inhibit signal combined with said video signal and having a frequency substantially equal to (N+(1/2)·
fh±
fv/2, where N is an integer, fh is a horizontal frequency of said video signal and fv is a vertical frequency of said video signal; andcontrol means for inhibiting operation of said recording means upon detection of said copy-inhibit signal by said detecting means. - View Dependent Claims (2, 3)
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Specification