Multiplexed pulse tone signal receiving apparatus
AssigneeEdison Control Corporation
InventorDesmond W. Hill
Life of this patent
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Abstract
A multiplexed pulse tone receiving apparatus for receiving predetermined ones of multiplexed pulse tone signals of the type comprised of pulse tone signals of different tone frequencies, each tone frequency being transmitted during a recurring pulse time slot. The receiving apparatus includes an input gate for supplying all of the multiplexed pulse tone signals to a tone detector. When a particular pulse tone signal having a predetermined frequency is received, gate control circuitry is operative to close the gate and, thereafter, to open the gate periodically only during those time slots in which this same pulse tone signal is received.
Claims12
Apparatus for receiving predetermined ones of multiplexed pulse tone signals, comprising:
- tone detector means having an input for receiving a tone signal and operable to detect a tone signal of predetermined frequency;
- input gate means coupled to said input of said tone detector means for supplying multiplexed pulse tone signals thereto;
- output means coupled to said tone detector means for producing an output signal when said tone detector means detects a tone signal of said predetermined frequency;
- and
- gate control means responsive to said output signal for periodically actuating said input gate means to assume a transmissive condition so as to pass only predetermined ones of said multiplexed pulse tone signals to said tone detector means.
Dependencies are inferred from the claim text.