Method and apparatus for detecting a radio frequency to which a broadcast receiver is tuned
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United States of America Patent
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Nov 27, 2007
Grant Date -
Jul 8, 2004
app pub date -
Oct 14, 2003
filing date -
Apr 30, 1999
priority date (Note) -
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Abstract
A method and apparatus is disclosed for detecting the frequency to which a broadcast receiver is tuned. In one embodiment, a sensing unit emits a chirp signal over a range of broadcast bands and monitors the output of the radio receiver to detect the frequency to which the radio receiver is tuned. In another embodiment, a sensing unit demodulates radio signals across a range of frequencies and compares the demodulated signals to observed audio output of the radio receiver.
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