Continuous tone decoder/encoder

Details Continuous tone decoder/encoder Continuous tone decoder/encoder

1980-10-16

1984-11-20

Chin, Tommy P.

Telecommunications

Transmitter and receiver at separate stations

455 84, 34082544, H04B 148, H04Q 145

Patent

active

044843542

ABSTRACT:
An improved encoder/decoder circuit which utilizes a phase locked loop frequency synthesizer configuration to permit both encoder and decoder operation. In addition, a sampling filter detector is employed to permit monolithic integration of the circuit and minimize sensitivity to vibration. The sampling filter detector has digitally controlled bandwidth which permits rapid response to reverse burst turn-off. In addition, the circuit includes a pulse adder to implement an energy limited reverse burst turn-off mode.

REFERENCES:
patent: 3835394 (1974-09-01), Stolt
patent: 4017748 (1977-04-01), Davis
patent: 4021653 (1977-05-01), Sharp

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