Chinese Journal of Computers   Full Text
Title	Narrowband-Based Audio Watermarking with Self-Synchronization
Authors	LEI Yun1) LIU Jian1) YAN Bo2) YAN Yong-Hong1)
Address	1)(ThinkIT Speech Laboratory, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190) 2)(Administrative Bureau of Radio Station, The State Administration of Radio Film and TV, Beijing 100045)
Year	2008
Issue	No.7(1283—1290)
Abstract &   Background	Abstract This article presents a novel self-synchronizing audio watermark algorithm for shortwave narrow band channel. This algorithm has the following merits: (1) While the watermark information being hideaway, synchronized signal is inserted, which enables the watermark to have the clock self-synchronizing and the data self-synchronizing abilities. (2) The watermark can be transmitted through narrow band channel, which is suitable for the shortwave broadcasting. (3) The watermark signal can resist disturbances during shortwave transmission. The experiments indicate that, this algorithm can be applied to watermark insertion for shortwave program, and it showes satisfactory robustness for real-world application. Keywords digital watermark; audio watermark; self-synchronizing; shortwave; narrowband Background This article presents a radio station identification system for shortwave broadcasting. This identification system is based on digital audio watermark technology. The watermark information is embedded into program audio signal before transmission. Through the watermark information decoder, the system can identify the source broadcasting station of the received program signal, which can also help to evaluate the quality of the broadcasting program. Due to the complicities of the shortwave narrow band, the work of this article mainly focuses on the robustness of watermark algorithm.