Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-11-14
1983-01-11
Cangialosi, Sal
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455 26, H04M 170
Patent
active
043683576
ABSTRACT:
A secure communications system provides a non-secure bypass circuit, which circuit is in parallel with a scrambler or other device. The scrambler is operative during a secure mode to convert data or voice signals into scrambled signals. During a plain text mode, the bypass circuit is operative to directly transmit unscrambled data to the communications channel. The bypass circuit includes monitoring means which are operative to monitor the status of the bypass circuit during a secure mode to assure that there is no leakage of unscrambled information during the secure mode. To accomplish this, the bypass circuit operates in conjunction with analog gates, each of which receives an AC voltage indicative of the plain text signal, simultaneously with a DC status voltage, which voltage is monitored at each gate location to provide an output signal when any gate is not disabled during a secure mode. In this manner, the user is immediately informed that there is an information leakage and that secure transmissions cannot properly proceed.
REFERENCES:
patent: 4208544 (1980-06-01), Burke, Jr.
Cangialosi Sal
International Telephone and Telegraph Corporation
Lee, Jr. Robert E.
O'Halloran John T.
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