A high capacity blind watermarking for two-channel audio signals based on CDMA-ICA

In this paper, we investigate how data embedding capacity and extraction fidelity can be enhanced keeping imperceptibility of the host audio unaltered. To meet this end, we propose a new blind watermarking system for two-channel audio signals which is based on Code Division Multiple Access (CDMA) and Independent Components Analysis (ICA) techniques. At the emitter, CDMA is used to increase the watermark bit rate by inserting multiple parallel data. At the receiver, ICA algorithm is applied to recover the embedded information. In order to demonstrate the effectiveness of the proposed scheme, simulations under various conditions are conducted. The new system provides an embedding rate up to 60Kbits/s, while ensuring a compromise between inaudibility and extraction reliability.