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Abstract

A frequency-to-voltage converter which responds either to frequency variations or to time period variations of a varying frequency input signal. When arranged to respond to frequency variations, the input signal is mixed with two fixed frequency framing signals having known frequency relationships to the frequency of a fixed frequency reference signal. One framing signal has a frequency greater than the maximum frequency of the input signal and the other framing signal has a frequency less than the minimum frequency of the input signal. By mixing the input signal with the framing signals and then measuring the relative times required to count a prescribed number of cycles of each of the difference signals produced by the mixing, an indication of changes in the input signal frequency relative to the reference signal frequency is developed. When arranged to respond to time period variations, the reference signal is mixed with two variable frequency framing signals having known frequency relationships to the range of frequency variations of the input signal. One framing signal has a frequency range greater than the reference signal frequency and the other framing signal has a frequency range less than the reference signal frequency. By mixing the reference signal with the framing signals and then measuring the relative times required to count a prescribed number of cycles of each of the difference signals produced by the mixing, an indication of changes in the input signal frequency relative to the reference signal frequency is developed.

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First Claim