CROSS-TERM COMPENSATION POWER ADJUSTMENT OF EMBEDDED AUXILIARY DATA IN A PRIMARY DATA SIGNAL

摘要

An auxiliary data signal x(m) is transported with a primary data signal s(t) by hiding the auxiliary data signal in the form of colored noise (94). The colored noise has a spectrum that simulates the spectrum of the primary data signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise pc(n) (107, 98), the auxiliary information stream(s) can be rendered at any desired level below or above an interference threshold in the primary data signal. The power of the colored noise is further compensated (107, 98) to account for a cross-correlation between the primary data signal s(t) and the auxiliary data signal x(m) to enhance the recovery of the auxiliary data at a decoder.