Communications: electrical – Selective – Intelligence comparison for controlling
Patent
1970-06-15
1976-02-17
Farley, Richard A.
Communications: electrical
Selective
Intelligence comparison for controlling
325 28, 325 65, 340 16C, 340171PF, 343225, H04B 1100
Patent
active
039394654
ABSTRACT:
An apparatus for activating a remote underwater device comprising detecting means responsive to incident acoustic waves provides signal indication of the presence or absence of predetermined frequencies thereof. A logic arrangement decodes only those signal indications indicating a joint presence of some of the pre-selected frequencies and the absence of others of the pre-selected frequencies. This discriminates signals against broad-band acoustic noise. The logic arrangement further includes means for activating the remote underwater device only if the decoded successive signal indications match a predetermined pattern. This further discriminates between a present received acoustic wave and a prior transmitted acoustic wave present because of multipath or reverberation. Lastly, a timing and gating means responsive to a first decoded signal indication couples the detecting means to the logic arrangement only at periodic intervals thereafter. The time gating also reduces the chances of obtaining a prior multipath and reverberation signal because the pulse repetition period of the successive acoustic waves is predetermined.
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patent: 3202968 (1965-08-01), Eady, Jr. et al.
patent: 3320576 (1967-05-01), Dixon et al.
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Snodgrass, Science, Vol. 162, pp. 78-87, Oct. 4, 1968.
Alarie Allan P.
Helton Robert A.
Walsh George M.
Bartlett Milton D.
Farley Richard A.
Pannone Joseph D.
Raytheon Company
Warren David M.
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