Time selective frequency detection by time selective channel to

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves

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324 78E, 324 78F, 455182, G01R 2316

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active

045636389

ABSTRACT:
A wide band receiver has connected to its input a series of narrow band channels. The incoming signal is processed through these narrow band channels with the greatest energy being produced in the narrow band channel closest to the incoming signal frequency. During the steady state portion of the signal the energy differences between the narrow band channel coinciding with the incoming signal frequency and channels higher and lower in frequency are maximum and exceed an established channel to channel ratio (CCR) level. A signal is produced by measuring the associated narrow band channel energy differences and comparing them to the channel CCR's. As the CCR comparison only produces a logic signal during the steady state portion of the incoming signal pulse, a clear unambiguous indication is provided of the relative energies between the narrow band channels. Additionally, a series of ESS curves are produced which have an amplitude responsive to frequency and responsive to the narrow band channel to narrow band channel energy comparisons. These comparisons are accomplished by taking the energy difference between adjacent narrow band channels and then the absolute magnitudes of these ESS curves are compared to produce logic signals indicative of frequency. The logic signals produced for the ESS curves are combined with the logic signals produced using the CCR's and during the steady state portion of the incoming pulse to produce a refined logic indication of the narrow band signal frequency.

REFERENCES:
patent: 3953802 (1976-04-01), Morris
patent: 4137497 (1979-01-01), Lowenschuss
patent: 4166927 (1979-09-01), Hamaoki
patent: 4215315 (1980-07-01), Lambert
patent: 4266201 (1981-05-01), Belfatto
patent: 4280140 (1981-07-01), Skerlos
patent: 4280387 (1981-07-01), Moog
patent: 4377961 (1983-03-01), Bode

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