Frequency verification of an amplitude modulated signal

Details Frequency verification of an amplitude modulated signal Frequency verification of an amplitude modulated signal

H - Electricity

04

B

H04B 17/00 (2006.01) G01R 23/02 (2006.01) H04B 1/04 (2006.01)

Patent

CA 2440294

An apparatus and method are disclosed for verifying the frequency of an AM carrier signal having a target frequency. The apparatus includes a high frequency clock that produces a clock signal having a higher frequency than the target frequency. A counter is advanced by the clock signal and reset after each cycle of the carrier signal. A first comparison portion compares the value recorded by the counter to a first reference value, and a second comparison portion compares the value recorded by the counter to a second reference value. An error determination portion attenuates the carrier signal if the comparisons conducted by the first and second comparison portions indicate an error condition.

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