Method and system for producing a signature characterizing an audio broadcast signal
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United States of America Patent
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Mar 18, 1997
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Apr 30, 1992
priority date (Note) -
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Abstract
A method and system for producing a signature which characterizes an audio broadcast signal for use in broadcast signal recognition, wherein the signature is based on a comparison of time-displaced frequency band values each representing a respective frequency band of the audio broadcast signal. Each of a first group of the frequency band values is compared with a respective value from the second group representing portions of the audio broadcast signal within the same predetermined frequency band. At least a part of the signal portions represented by the second group were broadcast prior to the signal portions represented by the first group, and a signature is formed based on the comparison of the first and second groups.
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