Informed algorithms for watermark and synchronization signal embedding in audio signal

This work presents audio watermarking algorithms robust to D/A and A/D conversion, scaling and quantization noise. The watermark is embedded in log-spectrum domain using a differential scheme and a quaternary bi-orthogonal code. An informed embedding algorithm is proposed, minimizing bit error rate while keeping distortion level below the masking threshold. An informed coding scheme, based on Costa's approach, is also used. Synchronization is based on two pilot signals, and the informed synchronization scheme is proposed, in order to speed up a synchronization process.