Registers – Coded record sensors – Particular sensor structure
Patent
1974-10-08
1976-04-27
Claffy, Kathleen H.
Registers
Coded record sensors
Particular sensor structure
235 52, G09B 500, G07C 1300
Patent
active
039524256
ABSTRACT:
A response analyzer simultaneously receives multi-frequency signals transmitted from a plurality of answering devices and forms time divided pulses, which are counted to provide an indication of the number of answering devices which made responses. A plurality of AND gates are each associated with one of the multi-frequency signals, and operate to sample the time divided pulses in order to determine which of the answering devices made responses. Formation of time divided pulses from the simultaneously received multi-frequency signals takes place through mixing the respective multi-frequency signals with a local oscillator signal having a frequency which is continuously and periodically varied, to thereby convert the signals into their intermediate frequency versions, from which a fixed frequency component is extracted.
REFERENCES:
patent: 3416243 (1968-12-01), Greenberg et al.
patent: 3506916 (1970-04-01), Mixsell et al.
patent: 3619783 (1971-11-01), Ritter
patent: 3676939 (1972-07-01), Oberst et al.
patent: 3703684 (1972-11-01), McVoy
Abe Kiyomi
Tagata Genichi
Tanaka Koich
Adams Bruce L.
Burns Robert E.
Claffy Kathleen H.
Lobato Emmanuel J.
Pentel Kabushiki Kaisha
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