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Source detection apparatus and method for audience measurement

  • US 7,774,807 B2
  • Filed: 10/24/2003
  • Issued: 08/10/2010
  • Est. Priority Date: 01/22/1997
  • Status: Expired due to Fees
First Claim
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1. A system for determining an operating mode of a recording/playing device comprising:

  • a first monitor configured to detect a first media signal output by a tuner configured to tune to a program signal;

    a second monitor configured to detect a second media signal output by a recording/playing device configured to at least one of record and play a program;

    a third monitor configured to detect a third media signal output by a receiver coupled to the recording/playing device;

    a fourth monitor configured to detect a fourth signal that is a recording signal generated by the recording/playing device only during recording of the program to form a recorded program; and

    a mode identifier coupled to the first, second, third, and fourth monitors and configured to identify an operating mode of the recording/playing device based on a comparison of the first and second media signals, a comparison of the second and third media signals, and a presence or absence of the fourth signal.

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