Technique for surveying a radio or a television audience
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United States of America Patent
Stats
-
May 13, 1997
Grant Date -
N/A
app pub date -
Jan 12, 1993
filing date -
Jan 12, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A surveying technique transmits a combined signal made up of a programming signal and a surveying signal, both of which are in the audible range. The surveying signal is uniquely coded to identify a signal source such as a radio station or television channel. At the receiver, the surveying signal is separated from the programming signal and then modified so as to be reproduced outside the audible range for detection by a portable unit worn by a person being monitored for his listening and/or viewing habits. The detection of the inaudible survey signal by the portable unit identifies the signal source to which the person was tuned.
First Claim
Family
International Classification(s)
Cited Art Landscape
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