Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1978-09-01
1980-07-29
Smith, Alfred E.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307233R, 328138, 324 83D, 324 78F, H03K 116, H03K 372
Patent
active
042152801
ABSTRACT:
A detector for detecting the presence of selected frequency components of an input signal and operative to deliver output responsive thereto by providing two separate signal paths in the detector, at least one path including filter circuitry having a distinct cross-over point operative to pass frequencies on one side of the cross-over point with one phase relative to the input and to pass frequencies on the other side of the cross-over point substantially 180.degree. out of phase relative to the input, and the detector further including a coincidence circuit receiving the signals from the two paths and generating one level of output for signals which are substantially in phase and generating another lower level of output for signals substantially out of phase. The coincidence circuit may have provisions for establishing an input threshold level which the signals must overcome.
REFERENCES:
patent: 3183449 (1965-05-01), Bray
patent: 3381220 (1968-04-01), Burr
patent: 3539828 (1970-11-01), Crouse
patent: 3543172 (1970-11-01), Seppeler
patent: 3564441 (1968-03-01), Eide
patent: 3721913 (1973-03-01), Theobald
patent: 3912917 (1975-10-01), Nussbaumer
patent: 3976958 (1976-08-01), Seidel
patent: 3988606 (1976-10-01), Eggermont
O'Hare Thomas P.
Smith Alfred E.
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