Copy protected pre-recorded videotape

Details Copy protected pre-recorded videotape Copy protected pre-recorded videotape

G - Physics

11

B

352/18.4

G11B 20/02 (2006.01) G11B 20/00 (2006.01) H04N 5/913 (2006.01)

Patent

CA 1337496

A copy protection arrangement for pre-recorded videotape cassettes. The invention includes both a method of protecting and a protected videotape cassette. Copy protection is provided by recording on at least a portion of the original videotape a composite synchronizing signal including a vertical synchronizing pulse having a pulse width in the range of 1-20 micro-seconds and a pulse height discernible by a vertical synchronizing signal separating circuit of the television receiver. All other vertical synchronizing pulses in the vertical synchronizing signal partition, all the equalizing pulses in a equalizing signal partition following the vertical synchronizing signal partition and at least a part of the horizontal synchronizing pulses in a horizontal synchronizing signal partition following the equalizing signal partition in the composite synchronizing signal have respective pulse heights less than a predetermined pedestal level of the synchronizing signals.

573207

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