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Abstract

A converter for converting a variable data frequency which lies in a low frequency range whose upper limit is about 200 Hz to a corresponding digital value. The converter includes an electronic counter having an enabling input and a count input. Derived from the data frequency is a data signal whose frequency is a given sub-multiple of the data frequency as selected by a digital computer. The data signal is applied to the enabling input to enable the counter for a period equal to the duration of a half cycle of the incoming data signal. Derived from an electronic clock operating at a constant frequency above 10,000 Hz is a clock signal whose pulse repetition rate is a given sub-multiple thereof as selected by the computer. These clock pulses are applied to the count input of the counter whereby the count accumulated therein is determined by the duration of the enabling period. This count is entered in the computer which, having selected the data signal and the clock signal, knows the scale factor, and can then, on the basis of the entered count, calculate the true period (P) of the data frequency (F) and provide a digital output corresponding to the frequency as determined by the equation F=1/P.

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