Importance

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Abstract

Circuitry for sensing frequency over time of a signal that has zero crossings. A first circuit commences generation of a periodic waveform in response to at least some of the zero crossings. A bistable circuit connected to the waveform commencing circuit produces a first electrical level in response to a zero crossing and, upon the occurrence of a predetermined change in the waveform, produces a second electrical level until a subsequent zero crossing occurs. A third circuit low-pass filters the electrical levels from the bistable circuit to produce an output which is a function of the frequency of the signal. Methods for sensing frequency over time of a signal that has zero crossings are also disclosed.

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First Claim