Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-12-01
1994-05-31
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328138, 328140, 307522, G01R 2302
Patent
active
053172159
ABSTRACT:
A digital frequency discrimination circuit includes an edge detector coupled to receive a transmission signal for producing an edge detected signal; an edge timer including a shift register clocked by the clock signal and having the edge detected signal as a data input, and a timeout determining subcircuit having a plurality of bits of the shift register coupled as edge detection inputs, for determining and providing a timeout signal indicating whether any of the edge detection inputs represents an edge detection; and a state machine circuit coupled to receive the clock signal, the edge detected signal, and the timeout signal for producing an unsquelch signal indicating whether the transmission signal meets frequency discrimination requirements.
REFERENCES:
patent: 4326256 (1982-04-01), Furumoto
patent: 4611335 (1986-09-01), Arai et al.
patent: 4617678 (1986-10-01), Devensky et al.
patent: 4692710 (1987-09-01), Shooartsman
patent: 4763341 (1988-08-01), Murphy
patent: 5180935 (1993-01-01), Abdi et al.
patent: 5199049 (1993-03-01), Wilson
3Com Corporation
Callahan Timothy P.
Cunningham Terry D.
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