Circuit and method for maintaining security of video tape using

Details Circuit and method for maintaining security of video tape using Circuit and method for maintaining security of video tape using

1991-10-18

1992-09-08

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 3, 380 23, H04N 7167

Patent

active

051464950

ABSTRACT:
A circuit for maintaining security of a video tape using a privacy number, including a sensing circuit for sensing lead tape portions of the video tape and producing a desired signal in accordance with the sensed result, a microcomputer for producing a desired control signal in response to the sensed signal from the sensing circuit and producing a switching signal and a display signal when the privacy number is applied, a control circuit for controlling the operation of the sensing circuit in response to the switching signal from the microcomputer, a deck for being driven in accordance with the control signal from the microcomputer, and a display unit for displaying a desired character in accordance with the display signal from the microcomputer. A method of maintaining security of the video tape is provided using the privacy number. According to the disclosed circuit and method, for the video tape to be secured, the lead tape portion of the video tape is exposed to an infrared-ray from an infrared-ray emitting diode preventing unauthorized persons from playing back contents that the user has recorded on the magnetic video tape in the video cassette recorder.

REFERENCES:
patent: 4930158 (1990-05-01), Vogel
patent: 4945563 (1990-07-01), Horton et al.
patent: 5040210 (1991-08-01), Anderson
patent: 5054064 (1991-10-01), Walker et al.

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