METHOD OF DIGITAL-AUDIO WATERMARKING BASED ON COCHLEAR DELAY CHARACTERISTICS

This palm proposes a state-of-the-art method of digital-audio watermarking based on the properties of the human cochlear It is based on the concept of embedding inaudible, watermarks (e g, copyright data) into an original sound by controlling the phase characteristics of the sound in relation to the characteristics of cochlear delay The method involves two processes, i e , embedding and detecting data. The data-embedding process was carried out by applying two types of IIR all-pass filters with cochlear delays, and then selecting the filtered signal from these according to the watermarks The data-detection process involved estimating the group delay of the filter from the phase difference between the original and watermarked sounds to detect the embedded data We designed optimal group delays for the fillers. We experimentally evaluated the proposed Method by carrying out subjective detection tests, two objective detection tests (PEAQ and LSD), bit-detection tests, and three objective tests for 7 robustness (against down sampling, amplitude compression, and mp3-compression) We also comparatively evaluated the proposed method with four other methods (LSB, DSS, ECHO, and PPM). The results revealed that subjects could not detect the embedded data in any of the watermarked sounds we used, and that the proposed approach could precisely and robustly detect the embedded data flow the watermarked sounds