In this paper; we propose audio watermarking algorithm based on the critical band of human auditory sys-tem(HAS) without audibly affecting the quality of watermarked audio. According to the audio quality test; the SNR(signal to noise ratio) of the watermarked audio objectively is 80dB above and subjectively don't nearly perceive the difference between watermarked audio and original. In the robustness test; the proposed algorithm can detect the watermark more than 90% from various compression(MP3; AAC); A/D and D/A conversions; sampling rate conversions and especially asynchronizing attacks. We implement the proposed algorithm in portable audio player for copyright protection. The implemented PD(portable device) extracts 2 bits per 15 seconds. If the extracted bits are '11'; the PD stops playing the illegal song and PD supports the SDMI(secure digital music initiative) requirements.
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