Pulse or digital communications – Repeaters – Testing
Patent
1996-12-06
1999-08-10
Chan, Jason
Pulse or digital communications
Repeaters
Testing
375206, 370493, 370495, 370497, 370527, 370529, 704201, 704219, H04B 1707, H04B 169
Patent
active
059370009
ABSTRACT:
Auxiliary data is transported in a primary data signal by hiding the data in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary data signal. The data to be transported is first converted to a spread spectrum signal. The primary data 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 data 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 primary data 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 at a desired level at, below or above an interference threshold in the primary data signal.
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Lee Chong U.
Moallemi Kamran
Warren Robert L.
Chan Jason
Corrielus Jean B.
Hoppin Ralph F.
Lipsitz Barry R.
Solana Technology Development Corporation
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