Secret key watermarking in WAV audio file in perceptual domain

Digital audio watermarking is a system of insertion and detection of the key which called watermarking key in host audio to prove the intellectual property right of the audio files. In this paper I proposed an enhanced method for watermark generation and embedding according to input audio clip. The generated key is embedded in audio clip with sampling rate of 44.1 KHz with consideration of properties of perceptual domain of human auditory system. Audio clip sequences particularly uses th direct sequence spread spectrum by utilizing the concept of watermark key. The embedding algorithm creates 128 samples and calculates masking threshold value. The Fast Fourier Transform operates at 128 points at each samples and single bit of key is added. After that 128 point reverse mode of Fast Fourier Transformation is taken to write the audio samples in output sequences. The extraction algorithm reads both original and watermarked audio clips and matches each bits from both input audio samples to determine the differences. If there is difference, it is considered as key bit difference and extracted.