Digitally modulated CATV power measurement using undersampling
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United States of America Patent
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Mar 21, 2000
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N/A
app pub date -
Dec 2, 1997
filing date -
Dec 2, 1997
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Abstract
A signal power measurement apparatus for measuring the power of a first signal, with the first signal comprising a carrier signal modulated by an information signal. One embodiment of the present invention includes a signal power measurement apparatus comprising a RF receiver, an A/D converter, and a digital signal processing circuit. The RF receiver is operable to receive a first signal and generate an intermediate signal, with the intermediate signal comprising at least a portion of the first signal and having a bandwidth and a cutoff frequency. The A/D converter is operably connected to the RF receiver to receive the intermediate signal. The A/D converter generates a digital intermediate signal based on the intermediate signal, the digital intermediate signal having a sample rate less than twice the cutoff frequency. The digital signal processing circuit is operable to perform a power measurement on the digital intermediate signal, with the power measurement being representative of the power of at least a portion of the first signal.
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