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Audio Watermarking Technique for Embedding Side Information during Acoustic Transmission through the Air  

Choi, Joon-Hwan (서울대학교 전기.컴퓨터공학부)
Song, Won-Seok (서울대학교 전기.컴퓨터공학부)
Choi, Hyuk (서울시립대학교 컴퓨터과학부)
Kim, Tae-Jeong (서울대학교 전기.컴퓨터공학부)
Publication Information
Journal of KIISE:Information Networking / v.37, no.2, 2010 , pp. 150-156 More about this Journal
Abstract
Audio watermarking is the process of embedding inaudible information in an audio signal and has been widely used for copyright protection. In this research, we use the audio watermarking not for copyright protection but for the transmission of side information for user convenience, presenting an algorithm suitable for this purpose. Our new algorithm includes watermark embedding/extraction methods during acoustic transmission through the air that employ energy modulation of the audio signal and an efficient two-step synchronization method. The proposed algorithm is evaluated in experiments of conveying information from audio speakers to a mobile phone. The results show that reliable transmission is possible within a 5m range, which is an improvement achieved by our algorithm as compared to the existing one.
Keywords
Audio watermarking; Acoustic transmission through the air; Side information; Energy modulation; Synchronization;
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