System for carrying transparent digital data within an audio signal
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United States of America Patent
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Mar 18, 1997
Grant Date -
N/A
app pub date -
Jul 5, 1994
filing date -
Jul 5, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal processing system comprises inputs for an analog audio signal and a digital data signal. The digital data signal is modulated to an analog data signal in an inaudible frequency band. Filters are used to ensure that the audio signal is restricted to audible frequencies and that the analog data signal is restricted to inaudible frequencies. The two analog signals are then combined into a composite analog signal. The composite signal is stored on a medium such as a compact disc. Filters are used to extract and separate the two analog signals from the composite signal stored on the medium. The analog data signal is demodulated to retrieve the original digital data signal.
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