Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1985-12-16
1988-06-21
Buczinski, Stephen C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
358 84, 358 86, 455 2, 455 5, H04N 7167, H04N 7100, H04H 100
Patent
active
047529547
ABSTRACT:
A CPU in a subscriber terminal generates upstream data and a transmission request signal as an enable signal for sending the upstream data to a broadcast center. An oscillator generates a carrier wave while the enable signal is being held at a predetermined level. A multiplier multiplies the carrier wave with the upstream data and generates the upstream signal. A transmission level adjusting amplifier amplifies the upstream signal, and the amplified signal is sent onto a cable. A detecting means receives a signal associated with the enable signal and discriminates the presence of the carrier wave. A time constant circuit measures the period of time for which the carrier wave is present in response to output from the detecting means. A switching circuit stops supplying at least the carrier wave of a first frequency onto the cable in response to output from the time constant circuit which indicates that the carrier wave has been exceeded the predetermined period of time.
REFERENCES:
patent: 3733430 (1973-05-01), Thompson et al.
patent: 3886454 (1975-05-01), Oakley et al.
patent: 4245245 (1981-06-01), Matsumoto et al.
patent: 4343042 (1982-08-01), Schrock
patent: 4533948 (1985-08-01), McNamara et al.
patent: 4536791 (1985-08-01), Campbell et al.
Buczinski Stephen C.
Kabushiki Kaisha Toshiba
Wallace Linda J.
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