Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-12-09
1977-02-08
Safourek, Benedict V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
325308, 324 77CS, 178DIG13, H04B 1700
Patent
active
040074234
ABSTRACT:
Frequency response of a signal path over which frequency-spaced signals are transmitted is analyzed by sweeping relatively narrow pass band tunable receiving means across the frequency band expected to be received at the location to be analyzed. Incoming signal to which the tunable receiving means is tuned at any instant is used to control the frequency of a voltage controlled oscillator. The frequency of oscillations produced by the oscillator has a known relationship to the amplitude of the instantaneously received signals, and these oscillations are transmitted to a frequency-to-amplitude converter at a measuring location. The converter produces an output signal that has an amplitude which is a function of the frequency of oscillations applied to it. A spectrum indicator at the measuring location is connected to the converter to produce a visual display of the amplitude of signals received at the location at which the characteristics of the transmission path are being analyzed.
REFERENCES:
patent: 3153192 (1964-10-01), Pidhayny et al.
patent: 3540049 (1970-11-01), Gaunt
patent: 3624509 (1971-11-01), Morici
patent: 3676580 (1972-07-01), Beck
patent: 3794922 (1974-02-01), Osborn et al.
patent: 3868568 (1925-02-01), Ashida et al.
Bell Telephone Laboratories, "Transmission Systems for Communications" 4th ed. 1970, p. 39.
Gillette Donald P.
Intech Laboratories, Inc.
Masinick Michael A.
Safourek Benedict V.
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