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Tests for non-linear distortion using digital signal processing

  • US RE40,322 E1
  • Filed: 05/27/2005
  • Issued: 05/20/2008
  • Est. Priority Date: 01/22/1999
  • Status: Expired due to Term
First Claim
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1. A test system for measuring a non-linear distortion created by a reference test signal transported on a signal path comprising:

  • a transmitter for transmitting the reference test signal;

    a receiver, for receiving an impaired reference test signal, wherein the impaired reference test signal comprises the reference test signal as impaired while passing between the transmitter and receiver through the signal path;

    a digital signal processor connected to an output of the receiver to receive the impaired reference test signal from the receiver, the digital signal processor;

    storing a copy of the reference test signal;

    computing an impulse response of the signal path using the copy of the reference test signal and the impaired reference test signal;

    calculating the energy in the impulse response during time periods of the impulse response that contain primarily non-linear distortion energy.

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