US Patent No: 5,757,910
Number of patents in Portfolio can not be more than 2000
Apparatus for preventing illegal copying of a digital broadcasting signal
Stats
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May 26, 1998
Issued date -
Jun 11, 1996
filing date -
08/661,661
serial no -
In Force
status
Importance
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Abstract
An apparatus for preventing illegal copying of a digital broadcasting signal, comprises a transmission section for generating a copy prevention signal to determine a display time of each field of a digital video signal on a screen, compressing the digital video signal and the copy prevention signal, modulating the compressed copy prevention signal and digital video signal into the digital broadcasting signal and transmitting the digital broadcasting signal through a transmitting antenna, and a reception section for receiving the digital broadcasting signal transmitted from the transmission section through a receiving antenna, demodulating the received digital broadcasting signal into the digital video signal, expanding the demodulated digital video signal, detecting the copy prevention signal from the expanded digital video signal, generating horizontal and vertical synchronous signals in response to the detected copy prevention signal and displaying the expanded digital video signal on the screen synchronously with the generated horizontal and vertical synchronous signals.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,034,981 Anti-copying video signal processing | 43 | 1989 | |
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| 4,594,609 Scrambling system for television video signal | 82 | 1983 | |
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| 5,384,598 System and method for frame differencing video compression and decompression with frame rate scalability | 84 | 1992 | |
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| 4,945,563 Video system and method for controlled viewing and videotaping | 142 | 1988 | |
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| 4,907,093 Method and apparatus for preventing the copying of a video program | 41 | 1988 | |
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| 5,113,441 Method for scrambling a television signal and method and apparatus for descrambling a scrambled television signal | 11 | 1990 | |
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| 5,182,771 Anti-taping method and apparatus for a multiplexed analog component television system | 29 | 1991 | |
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| 5,177,618 Dual deck VCR and duplicating circuit therefor | 48 | 1990 | |