Sequential tone acoustic command link

Details Sequential tone acoustic command link Sequential tone acoustic command link

1977-04-14

1978-08-29

Farley, Richard A.

Communications: electrical

Selective

Intelligence comparison for controlling

340 16C, 340148, 340171A, 325419, 325420, H04B 1100, H04Q 902

Patent

active

041107250

ABSTRACT:
An acoustic multi-tone code signal is transmitted through a water environment to a receiver unit which includes a multi-tone code decoder. If the signal-to-noise ratio of the input signal is above a certain threshold, only then will the coded signal be passed on to the decoder which will provide an output control signal in accordance with the particular code.

REFERENCES:
patent: 3701103 (1972-10-01), Padgett et al.
patent: 3939465 (1976-02-01), Helton et al.
patent: 4001772 (1977-01-01), Powell et al.

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