Taiga Nakamura, Ryuki Tachibana, and Seiji Kobayashi, "Automatic Music Monitoring and Boundary Detection for Broadcast using Audio Watermarking", Proceedings of Security and Watermarking of Multimedia Contents IV, SPIE vol. 4675, pp. 170-180, San Jose, USA, January 2002.
Abstract: An application of watermarking for automatic music monitoring of radio broadcasts is discussed. By embedding information into the music as a watermark before broadcasting it, it is possible to keep track of what music has been on the air at what time, and for how long. However, to effectively implement this application, the handling of content transitions is important, because the detection reliability deteriorates at the content boundaries. In this paper, a method of detecting content boundaries using overlapping detection windows is described. The most probable pattern of content transition is selected under the condition that detection results from multiple windows are available. The derived rules are represented using a finite state model, which is useful for detection in real time. Experimental results on FM radio broadcasts are also presented.
http://citeseer.ist.psu.edu/684728.html
http://www.trl.ibm.com/projects/RightsManagement/datahiding/paper/Taiga_EI02Paper.pdf