Encoding a code signal into an audio or video signal
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United States of America Patent
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Jun 22, 2004
Grant Date -
N/A
app pub date -
Jun 14, 2001
filing date -
Oct 2, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided an apparatus and method for encoding a code signal particularly into an audio signal. Previously as a result of data compression protocol codes hidden into 'sync periods' have been degraded or lost as a result of, for example, low pass filtering. Sometimes, during quiet intervals codes were audible. The invention overcomes the problem of encoding a code into an audio signal by sampling the audio signal in order to determine its energy content and embedding the code into a suitable portion of the audio signal so that the code is hidden within a sufficiently energetic portion of audio signal. The advantage is that code is never audible.
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