Active system and method for remotely identifying RF broadcast stations
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United States of America Patent
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Oct 6, 1998
Grant Date -
N/A
app pub date -
Nov 20, 1996
filing date -
Nov 20, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A survey electronics package (32) of a survey system (10) includes a transmitter (36) and a receiver (38). The transmitter (36) transmits a survey signal which a radio (12) residing in a detection zone (14) receives and demodulates to generate an audio echo signal. The audio echo signal is magnetically radiated from a speaker (26) of the radio (12). The receiver (38) magnetically senses this magnetically radiated audio echo signal. A bandpass filter (48) in the receiver (38) and a correlation process (86) insure that only a valid audio echo signal is recorded. When the detection of a valid audio echo signal corresponds to a radio (12) tuned to a particular radio station, a record is made of the detection.
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