Frequency verification of an amplitude modulated signal

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

2005-04-19

2005-04-19

Vo, Nguyen T. (Department: 2685)

Telecommunications

Transmitter

Carrier amplitude control

C455S117000, C455S127200

Reexamination Certificate

active

06882832

ABSTRACT:
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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patent: 5165047 (1992-11-01), Shimizu
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patent: 0098349 (1989-11-01), None

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