Three Techniques of Digital Audio Watermarking

The ease with which digital audio data such as songs and music can be copied and distributed has created a demand for methods for copyright protection and identification of ownership. Audio watermarking techniques are possible solutions to these problems. Watermark can be considered as special information hidden within the audio data. This information should be readily recovered by the owner, transparent to the user, resistant to unauthorized removal, and robust against attacks. In other words, the audio watermark should not be perceptible even to golden ears. In addition, the watermark should be robust to manipulation and common signal processing operations such as filtering, re-sampling, addition of noise, cropping, digital-to-analog and analog-to-digital AbstRAct