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Digitally modulated CATV power measurement using undersampling

  • US 6,041,076 A
  • Filed: 12/02/1997
  • Issued: 03/21/2000
  • Est. Priority Date: 12/02/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring power of a first signal, the first signal comprising a carrier signal modulated by an information signal, the first signal having a signal strength spectrum that approximates a signal strength spectrum of white noise, the apparatus comprising:

  • a) an RF receiver for receiving the first signal and generating an intermediate signal therefrom, the intermediate signal comprising at least a portion of the first signal and having a bandwidth and a cutoff frequency;

    b) an A/D stage operably connected to the RF receiver to receive the intermediate signal therefrom, said A/D stage operable to generate a digital intermediate signal from the intermediate signal, the digital intermediate signal having a sample rate of less than twice the cut-off frequency;

    c) a digital signal processing circuit operable to generate a power measurement on the digital intermediate signal using a sufficient number of samples of the digital intermediate signal to reduce an error due to undersampling to below a predetermined amount, the power measurement representative of the power of at least a portion of the first signal.

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