Pulse or digital communications – Repeaters – Testing
Patent
1995-09-06
1998-10-13
Vo, Don N.
Pulse or digital communications
Repeaters
Testing
375206, 370493, 370495, 370497, 370527, 370529, 704219, 704201, H04B 1707, H04B 169
Patent
active
058223606
ABSTRACT:
Auxiliary data is transported in a conventional audio signal by hiding the data in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary audio signal. The data to be transported is first converted to a spread spectrum signal. The primary audio signal is analyzed to determine its spectral shape. The same spectral shape is imparted to the spread spectrum signal, which is then combined with the primary audio signal for transmission. The spectral shaping can be performed using time domain modeling and synthesis such as linear predictive coding or by using subband coding techniques such as fast Fourier transforms. A plurality of different auxiliary information streams can be transported on the audio signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered inaudible in the primary audio signal, or at any desired level below or above an audible threshold.
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Lee Chong U.
Moallemi Kamran
Warren Robert L.
Hoppin Ralph F.
Lipsitz Barry R.
Solana Technology Development Corporation
Vo Don N.
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