International Journal of Engineering and Technology

Many blind audio watermarking schemes using FFT are available and are robust to signal processing attacks, but fail at de-synchronization attacks. A simple blind audio watermarking using Fast Fourier Transform (FFT) is explored in this work and its robustness is improved by using a synchronization code. In this process, initially the entire audio stream is segmented and each audio segment is divided into two parts. In the first part of the audio segment, a synchronization code is embedded and in the second part watermark is embedded. In the process of watermark embedding, the original audio is segmented into non-overlapping frames. A binary watermark image is encrypted using Gauss Map and embedded into each frame of FFT coefficients of the audio signal using Quantization Index Modulation (QIM). The analysis and results upon experimentation demonstrate that this method is superior to other state-of-art methods in terms of imperceptibility, security and payload. At the same time, it is effective against common signal processing attacks and de-synchronization attacks like signal addition, signal subtraction, cropping, MP3 compression and time-scale modification.