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US5907655A
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Method and apparatus for recording and reproducing digital video signals as a function of copy protection of a tape
Assignee: Sony Corp
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Filing: 1996-09-30
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Granted: 1999-05-25
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Expires: 2016-09-30
Abstract
Abstract An apparatus records and reproduces digital video signals on a tape such that recording by another digital VTR or another analog VTR can be blocked, both through a digital interface and an analog interface, to provide a copy protection through various techniques, such as AGC or color striping. The digital recording format includes a recording area for encoded video signals and a recording area for auxiliary information configured in packs. A disturbance signal generating flag is included in an auxiliary information pack and recorded in the auxiliary information recording area. Based on the status of the flag, a disturbance signal may be inserted as a copy protection signal that is reproduced from the encoded video signals into the analog video signal.
Inventors
- 👤 Masaki Oguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; G11B20/00; G11B20/10; H04N2005/91307; H04N2005/91314; H04N2005/91328; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826; H04N5/78263; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/806; H04N9/8063; H04N9/82; H04N9/8205
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
205 words
A method for recording and reproducing on a recording medium a digital picture signal using a format which includes a picture recording area for storing said digital picture signal and an auxiliary recording area for auxiliary information configured in packs, said method comprising the steps of: detecting an analog copy protection signal from an analog video signal by counting pseudo sync pulses in a horizontal synchronization period and comparing the counted pseudo sync pulses to a predetermined threshold value such that said analog copy protection signal is detected if the number of the counted pseudo sync pulses exceeds said predetermined threshold value, wherein said analog video signal includes an analog picture signal and said analog copy protection signal; recording a disturbance signal generating flag in said auxiliary recording area in response to the detected analog copy protection signal; converting said analog picture signal into said digital picture signal for recording in said picture recording area; reproducing said analog picture signal from said picture recording area; obtaining said disturbance signal generating flag from said auxiliary recording area; and inserting a disturbance signal into said reproduced analog picture signal to disturb subsequent recording thereof, said disturbance signal being a function of said obtained disturbance signal generating flag.
Claim 2
Independent Claim
205 words
A method for recording and reproducing on a recording medium a digital picture signal using a format which includes a picture recording area for storing said digital picture signal and an auxiliary recording area for auxiliary information configured in packs, said method comprising the steps of: detecting an analog copy protection signal from an analog video signal by counting pseudo sync pulses in a horizontal synchronization period and comparing the counted pseudo sync pulses to a predetermined threshold value such that said analog copy protection signal is detected if the number of the counted pseudo sync pulses exceeds said predetermined threshold value, wherein said analog video signal includes an analog picture signal and said analog copy protection signal; recording a disturbance signal generating flag in said auxiliary recording area in response to the detected analog copy protection signal; converting said analog picture signal into said digital picture signal for recording in said picture recording area; reproducing said analog picture signal from said picture recording area; obtaining said disturbance signal generating flag from said auxiliary recording area; and inserting a disturbance signal into said reproduced analog picture signal to disturb subsequent recording thereof, said disturbance signal being a function of said obtained disturbance signal generating flag.
Claim 3
Dependent Claim
35 words
The method according to claim 1, further comprising the step of providing another flag to indicate whether said disturbance signal is to be inserted into a vertical blanking period of said reproduced analog picture signal.
Claim 4
Dependent Claim
17 words
The method according to claim 1, wherein said disturbance signal is an automatic gain control (AGC) signal.
Claim 5
Dependent Claim
15 words
The method according to claim 1, wherein said disturbance signal is a color striping signal.
Claim 6
Independent Claim
214 words
An apparatus for recording and reproducing on a recording medium a digital picture signal using a format which includes a picture recording area for storing said digital picture signal and an auxiliary recording area for auxiliary information configured in packs, said apparatus comprising: means for detecting an analog copy protection signal from an analog video signal by counting pseudo sync pulses in a horizontal synchronization period and comparing the counted pseudo sync pulses to a predetermined threshold value such that said analog copy protection signal is detected if the number of the counted pseudo sync pulses exceeds said predetermined threshold value, wherein said analog video signal includes an analog picture signal and said analog copy protection signal; means for recording a disturbance signal generating flag in said auxiliary recording area in response to the detected analog copy protection signal; means for converting said analog picture signal into said digital picture signal for recording in said picture recording area; means for reproducing said analog picture signal from said picture recording area; means for obtaining said disturbance signal generating flag from said auxiliary recording area; and means for inserting a disturbance signal into said reproduced analog picture signal to disturb subsequent recording thereof, said disturbance signal being a function of said obtained disturbance signal generating flag.
Claim 7
Independent Claim
214 words
An apparatus for recording and reproducing on a recording medium a digital picture signal using a format which includes a picture recording area for storing said digital picture signal and an auxiliary recording area for auxiliary information configured in packs, said apparatus comprising: means for detecting an analog copy protection signal from an analog video signal by counting pseudo sync pulses in a horizontal synchronization period and comparing the counted pseudo sync pulses to a predetermined threshold value such that said analog copy protection signal is detected if the number of the counted pseudo sync pulses exceeds said predetermined threshold value, wherein said analog video signal includes an analog picture signal and said analog copy protection signal; means for recording a disturbance signal generating flag in said auxiliary recording area in response to the detected analog copy protection signal; means for converting said analog picture signal into said digital picture signal for recording in said picture recording area; means for reproducing said analog picture signal from said picture recording area; means for obtaining said disturbance signal generating flag from said auxiliary recording area; and means for inserting a disturbance signal into said reproduced analog picture signal to disturb subsequent recording thereof, said disturbance signal being a function of said obtained disturbance signal generating flag.
Claim 8
Dependent Claim
33 words
The apparatus according to claim 5, further comprising means for providing another flag to indicate whether said disturbance signal is to be inserted into vertical blanking period of said reproduced analog picture signal.
Claim 9
Dependent Claim
20 words
The apparatus according to claim 5, further comprising means for transferring said disturbance signal generating flag via a digital interface.
Claim 10
Dependent Claim
17 words
The apparatus according to claim 5, wherein said disturbance signal is an automatic gain control (AGC) signal.
Claim 11
Dependent Claim
15 words
The apparatus according to claim 5, wherein said disturbance signal is a color striping signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-05-24 | 2002-11-23 | 2003-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-24 | 2006-11-23 | 2007-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-24 | 2010-11-23 | 2011-05-25 | $7700.00 | Window Closed / Lapsed |