AN IMPROVED SCHEME OF AUDIO WATERMARKING BASED ON TURBO CODES AND CHANNEL EFFECT MODELING

Digital audio watermarking is adopted for many multimedia appli-cations such as copyright management, music indexing, broadcast monitoring, etc. The watermarking techniques must ensure an im-perceptible watermark and a reliable transmission with a maximized robustness to a various range of perturbations depending on the ap-plication purposes. This paper deals with an improved error correc-tion strategy for digital audio watermarking. It uses a turbo cod-ing algorithm, coupled with a Wiener filtering, that takes into ac-count the equivalent corrupting noise of the watermarking channel and works with reliable soft metrics values. Experimental tests on real audio signals demonstrate improved bit error rates (BER) per-formances comparing to the reference generic system which uses a Wiener filter at the detection side. Index Terms — : Audio watermarking, turbo codes, channel medelin