Patent US5537216A successfully refreshed from Google Patents.
US5537216A
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Circuit for including a copy-inhibit signal with a video signal
Assignee: Sony Corp
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Filing: 1995-05-03
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Granted: 1996-07-16
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Expires: 2015-05-03
Abstract
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.
Inventors
- 👤 Keitaro Yamashita
- 👤 Masatoshi Kawano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:19
CPC Classifications
G; G11; G11B; G11B20/00; G01; G01B; G01B15/00; G01B15/04; G11B19/00; G11B19/02; G11B20/00086; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N7/00; H04N7/16; H04N7/166
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
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.
Claim 2
Dependent Claim
89 words
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.
Claim 3
Dependent Claim
25 words
The video recording apparatus of claim 1, wherein said recording means comprises video tape recording means for recording said video signal on a video tape.
Claim 4
Dependent Claim
24 words
The video recording apparatus of claim 2, wherein said detecting means includes comb filter means for separating the copy-inhibit signal from the video signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-16 | 2000-01-15 | 2000-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-16 | 2004-01-15 | 2004-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-16 | 2008-01-15 | 2008-07-16 | $7700.00 | Window Closed / Lapsed |