Method and apparatus for recording and reproducing digital video signals as a function of copy protection of a tape
First Claim
1. 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.
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Accused Products
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.
38 Citations
9 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4)
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5. 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:
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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. - View Dependent Claims (6, 7, 8, 9)
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Specification