Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Modulator/demodulator
Patent
1978-11-27
1980-12-02
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Modulator/demodulator
324 62, 324438, G01R 2702
Patent
active
042374170
ABSTRACT:
An improved signal transmission apparatus of two-wire type is disclosed. The transmitting circuit of the improved apparatus comprising a voltage-frequency converter to convert a DC input signal into an AC signal having a frequency proportional to the magnitude of the DC input signal, an AC amplifier circuit coupled to the output of said converter through a first insulating transformer to amplify the AC output signal of the converter, a frequency-voltage converter to convert the amplified AC output signal of the AC amplifier circuit into a DC voltage signal having a magnitude proportional to the frequency of the AC signal, a voltage-current converter circuit to change the magnitude of a direct current supplied from the DC power source in the receiving circuit to the transmitting circuit through a two-wire transmission line in response to the change in the magnitude of said DC voltage signal, and a rectifier circuit coupled to the output of said AC amplifier circuit through a second insulating transformer to rectify a portion of the amplified AC output of the AC amplifier circuit and to supply operating DC power to said voltage-frequency converter independently of the DC power source in the receiving circuit.
REFERENCES:
patent: 3246309 (1966-04-01), Gasch, Jr.
patent: 3503261 (1970-03-01), Riester et al.
patent: 3517556 (1970-06-01), Barker
patent: 3538355 (1970-11-01), Grindheim et al.
patent: 3562729 (1971-02-01), Hurd
patent: 3675122 (1972-07-01), Rose
patent: 3680384 (1972-08-01), Grindheim
patent: 3859594 (1975-01-01), Grindheim
patent: 3867694 (1975-02-01), Goltermann
Kenki Kagaku Keiki Co., Ltd.
Krawczewicz Stanley T.
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