A robust audio watermarking algorithm using pitch scaling

In this paper, we propose a robust watermarking technique that accepts A/D-D/A conversion and a lot of lossy compression such as MP3, AAC, WMA and Real Audio. Watermark robustness is enabled using a pitch scaling generating watermark, selecting the watermark inserting point, and using an error correction code. Test results shows that the BER is below 9%. The figure means that the proposed technique is able to extract encoded information perfectly by the error correction code.