Telecommunications – Use or access blocking
Patent
1958-05-09
1982-11-09
Birmiel, Howard A.
Telecommunications
Use or access blocking
455 30, 179 15R, H04K 100
Patent
active
043588573
ABSTRACT:
1. In combination, a first source for producing a first signal representative of intelligence to be transmitted from one point to another, second source for producing a binary carrier signal having a first voltage level and a second voltage level, means responsive to the first signal and to the binary carrier signal for frequency-modulating the carrier signal in accordance with the first signal to produce a modulated intelligence signal having first and second voltage levels and exhibiting transitions between the same, a third source for producing a binary encoding signl having first and second voltage levels and exhibiting transitions between such levels in conformance with an apparently random predetermined sequence of variations in the encoding signal between the first and second voltage levels at different multiples of a particular time interval, and circuit means coupled to said modulating means and to said third source for inverting the voltage level of the encoding signal from the first voltage level to the second voltage level and from the second voltage level to the first voltage level and upon the simultaneous occurrence of the second voltage level in the intelligence signal to produce an encoded intelligence signal.
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Gleason Joseph P.
Posthumus Harry G.
Birmiel Howard A.
Briody Thomas A.
Schwartz Charles H.
Streeter William J.
The Magnavox Company
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