Apparatus for generating a d.c. signal proportional to an input

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307271, 307275, 328132, 328141, H03B 304, H03K 520

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active

039449351

ABSTRACT:
An apparatus for generating a d.c. output signal which is proportional to the frequency of an alternating input signal, includes a pulse generator and a counter arranged to count pulses from the generator for a time which is dependent on the input signal frequency. A digital to analog converter is responsive to the count in the counter and also to the d.c. output signal to provide an intermediate d.c. signal which is compared with a d.c. reference signal. The difference between the intermediate and reference signals is integrated to provide the output signal. The arrangement is such that the d.c. output signal is directly proportional to the input signal frequency.

REFERENCES:
patent: 3461392 (1969-08-01), Hughes et al.
patent: 3663885 (1972-05-01), Stewart
patent: 3693097 (1972-09-01), Band
patent: 3798529 (1974-03-01), Jones
patent: 3820032 (1974-06-01), Schlaeppi
"Computers in Control and Data Processing" by Davis of Process Control and Automation, June 1964, pp. 249-252, part 3, Hybrid Computers, British Publication.

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