Acoustic steganographic transmission algorithm using signal coherent averaging

The paper discusses the algorithm of hidden data transmission, using acoustic signal as carrier. The perceptive transparency of hidden data was obtained with the use of psychoacoustic model of the Human Auditory System (HAS). Spectrum differential coding of binary patterns was used to add the hidden data to the host signal. The synchronous data decoding is enabled by the use of signal spectrum coherent averaging procedure and drift correction procedure for frequency and time. The diagrams present the efficiency of the algorithm both in terms of accuracy of hidden transmission synchronization, its robustness against degradation by noise and the efficiency of hidden data extraction.