Method and apparatus for defeating the operation of an IC built-

Details Method and apparatus for defeating the operation of an IC built- Method and apparatus for defeating the operation of an IC built-

1990-10-04

1992-07-21

Swann, Tod

Cryptography

Key management

Having particular key generator

358177, 358178, H04N 7167

Patent

active

051330091

ABSTRACT:
Apparatus for defeating a noise inverter disposed within the IC includes circuitry for changing the amplitude of the AGC signal applied to an AGC amplifier prior to the noise inverter so as to lower the level of the signal fed to the noise inverter. As a result, the signal fed to the noise inverter is less than the threshold signal level necessary for operation of the noise inverter. This enables use of an EIA multiport standard decoder with a standard television signal processing IC wherein the noise inverter is not directly accessible for defeating it.

REFERENCES:
patent: 3582551 (1971-06-01), Krug
patent: 3898380 (1975-08-01), Wilcox
patent: 4417277 (1983-11-01), Tonomura et al.
patent: 4670904 (1987-06-01), Rumreich
patent: 4706285 (1987-11-01), Rumreich
patent: 4827511 (1989-05-01), Masuko
"Standard Baseband (Audio/Video) Interface Between NTSC TV receiving Devices & Peripheral Devices"; EIA Interim Standard; Mar. 1989; pp. 1-23; EIA/IS-15-A.

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