Method for producing copy protected recorded videotape having un

Details Method for producing copy protected recorded videotape having un Method for producing copy protected recorded videotape having un

1988-07-29

1993-01-12

Young, Wayne R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358319, 360 15, 360 371, 360 60, 380 5, 380 15, H04N 5782

Patent

active

051794527

ABSTRACT:
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 pulse 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 having respective pulse height less than a predetermined pedestal level of the synchronizing signals.

REFERENCES:
patent: 3801732 (1974-04-01), Reeves
patent: 3963865 (1976-06-01), Songer
patent: 4100575 (1978-07-01), Morio et al.
patent: 4213149 (1980-07-01), Janko
patent: 4631603 (1986-12-01), Ryan
patent: 4839922 (1989-06-01), Imasaki et al.
Pamphlet of Matsushita model S-VHS AG-3750 MacLord and Matsushita model S-VHS AG-3700 MacLord, Jan., 1988.
Pamphlet of Victor Co. model S-VHS BR-S3600 (Sales Brochure-Mar., 1988).
Liff, "Color and Black & White Television Theory and Servicing" ISBN 0-13-151192-0 01, 1985.

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