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Audio watermarking for covert communication through telephone system
, Article 6th IEEE International Symposium on Signal Processing and Information Technology, ISSPIT 2006, Vancouver, BC, 27 August 2006 through 30 August 2006 ; 2006 , Pages 955-959 ; 0780397541 (ISBN); 9780780397545 (ISBN) ; Vosoughi Vahdat, B ; Shamsollahi, M. B ; Sameni, R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2006
Abstract
In this paper, a novel service that uses audio watermarking for covert communication through telephone system is presented. This system is suitable for ISDN and PSIN networks and it can be modified for using in mobile systems. We use a Direct sequence spread spectrum algorithem with perceptual modeling of HAS for embedding watermark into the audio or speed signals. The watermark is robust against telephone channel attacks such as AWGN , Low pass filtering, D/A-A/D conversion, Downsampling down to 64 slips and A-Law or μ-Law conversion. This system is also robust against audio format conversion such as wave (windows PCM) format to mp3 (down o 64 kbps compression. © 2006 IEEE