Hardware architecture for data concealment using sub-band coding, LSB coding and pseudo-random bit stream generators

Data concealment using sub-band LSB coding, LSB coding is an algorithm exhibiting good performance for hiding data within audio. This paper reports on the VLSI implementation techniques used for the algorithm. The implementation has both analogue input/output and digital audio input/output to interface to audio equipment, such as DAT, amplifier, audio precision analyser and similar. The architecture has been designed to give real time performance and consequently has high efficiency, whilst maintaining audio fidelity through careful analysis of wordlength and other effects. We also present the design study on investigating the feasibility of the selected implementation approach and estimate major system parameters.