System for carrying transparent digital data within an audio sig

Details System for carrying transparent digital data within an audio sig System for carrying transparent digital data within an audio sig

1994-07-05

1997-03-18

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 48, 369 49, 369 59, 360 29, 360 32, G11B 700

Patent

active

056129432

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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