Patent ID: 6512796
Filing Date: 2003-01-28
Classification: G10L,G11B,H04H

Abstract:
A method for combining a digital format data signal with an audio signal, comprising the steps of:1) choosing a portion of the audio signal into which the data signal is intended to be inserted, said portion being of a duration greater than that of the data signal; 2) choosing a plurality of proposed alternative starting locations along the audio signal portion for the insertion; 3) commencing at each starting location, identifying an audio signal length segment corresponding to the length of the data signal and segmenting the signal length segment into a series of subsegments, each of a length corresponding to the length of a bit of the data signal; 4) individually adjusting the magnitude of each bit of the data signal and combining the data signal and each audio signal length segment in a data signal bit-wise manner such that the data signal can be completely retrieved when passed through a given decoder; and 5) identifying the signal length segment and corresponding adjustments to the data signal bits which maximizes the covertness of the data signal in the combined signal.