JELE_V1_N4_RP8 M. Vadivel V. Saravanan Journal on Electronics Engineering 2249 – 0760 1 4 50 55 DFT, IDFT, MIDI Musical performance with digital instruments has become a common practice today and many digital instruments came to be used in Desk Top Music, live performance, etc. However, the spread of digital contents causes the problem of illegal duplication and distribution, so that digital watermark has recently attracted much attention as a technology to solve this problem. In this project the authors focus on a sound synthesized process in digital instruments and propose a real-time watermark method. Certain watermarks are embedded in wave tables that include in our digital instruments and the insertion of secret messages is actualized with wave table switching additionally embedded watermarks can be extracted from the acoustic signal. The proposed method is able to achieve a real-time watermark. June - August 2011 Copyright © 2011 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1511