Signal identification system
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United States of America Patent
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-
May 12, 1992
Grant Date -
N/A
app pub date -
Oct 25, 1989
filing date -
Oct 25, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A signal identification system, suitable for producing an identification code on a sound track recording is described. The system includes an encoder 209 effective to eliminate a variable sequence of frequency bands from an audio signal and insert a sequence of code signals into the frequency bands. As the sequence of frequency bands varies throughout the sound track recording, the presence of the code is difficult to detect.
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