G - Physics – 01 – R
Patent
G - Physics
01
R
324/37
G01R 23/15 (2006.01)
Patent
CA 1144986
Case 2737 FREQUENCY DETERMINING APPARATUS ABSTRACT OF THE DISCLOSURE A frequency determining apparatus for receiving an input signal of unknown frequency and providing an output signal representing the frequency where the output signal is updated at substantially regular intervals regardless of the frequency of the input signal. A frequency divider or prescaler divides the input signal by a factor n to give an adjusted signal. A gated counter counts stable clock pulses for a time period related to the period of the adjusted signal to give a count inversely related to the frequency of the adjusted signal. A calculator corrects the count for the factor n and derives an output signal representing the frequency of the input signal. The calculator also determines if the count has increased above an upper limit or decreased below a lower limit, and if so it changes the factor n accordingly to maintain the count and correspondingly the adjusted signal within a predetermined range. The count is updated in accordance with the period of the adjusted signal which is main- tained within predetermined limits and consequently is updated at substantially regular intervals even though the frequency of the input signal changes greatly.
358632
Canadian General Electric Company Limited
Eckersley Raymond A.
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