Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1975-10-20
1976-10-05
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307233R, 307295, 328140, 328167, H03D 300, H03B 304, H03K 520
Patent
active
RE0289973
ABSTRACT:
A circuit combination of integrated circuit (IC) digital devices for detecting an analog signal of a selected frequency and amplitude is disclosed. The circuit combination is a special-purpose digital filter of a predetermined bandwidth determined by the sample time T.sub.S duration and the low F.sub.L and high F.sub.H frequencies of the passable analog signal frequency having a carrier frequency F.sub.A. The analog signal is initially tested for minimal amplitude and converted to a digital signal by a conventional comparator circuit. The pulses of the digital signal are counted over the sample time T.sub.S and compared to the passable bandwidth: if the analog signal frequency F.sub.A [ (F.sub.L .ltoreq. F.sub.A .ltoreq. F.sub.H)] is within the bandpass, F.sub.L .ltoreq. F.sub.A < F.sub.H, i.e., passable, a first binary signal is produced; alternatively, if the analog signal frequency F.sub.A [ (F.sub.L > F.sub.A .gtoreq. F.sub.H)] is without the bandpass, F.sub.L > F.sub.A .gtoreq. F.sub.H, i.e., not passable, a second binary signal is produced. Sample times continue throughout the detection-comparing operation to ensure a continuous filtering process.
REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3543172 (1970-11-01), Seppeler
patent: 3619651 (1971-11-01), Aldrich
patent: 3757233 (1973-09-01), Dixon
patent: 3761809 (1973-09-01), Lockitt et al.
patent: 3769583 (1973-10-01), Spencer et al.
patent: 3769596 (1973-10-01), Peersch
Cardon Carlos D.
Griffone Lawrence P.
Grace Kenneth T.
Miller, Jr. Stanley D.
Nikolai Thomas J.
Sperry Rand Corporation
Truex Marshall M.
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