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Method for polling headphones of a passive TV audience meter system

  • US 4,652,915 A
  • Filed: 11/12/1985
  • Issued: 03/24/1987
  • Est. Priority Date: 11/12/1985
  • Status: Expired due to Fees
First Claim
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1. A method of polling headphones having means for receiving a headphone unique identification ("ID") poll, means responsive to the receipt of a headphone unique ID poll for enabling a timer and headphone audio and for transmitting an acknowledge signal, and means responsive to the timer for disabling the headphone audio when it times out comprising:

  • polling the headphones of an audience metering system with a headphone unique ID signal having a long time period between polls;

    the headphone polled by the headphone unique ID code responding to the receipt of the poll byenabling audio,transmitting an acknowledge signal, andterminating audio after a predetermined period of time shorter than said long time period unless another poll having the unique ID code of this headphone is received;

    and in response to the receipt of an acknowledge signal from the headphone polled, continuing polling this particular headphone with a short time period between polls, the short time period being less than the predetermined time of the headphone to disable audio.

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