This paper describes a multiple audio watermarking using Quantization Index Modulation (QIM) on frequency phase and magnitude response. Proposed embedding procedure is composed of two stage. At the first stage, the watermark is embedded on the frequency phase response using QIM. In the second stage, the watermark is embedded using adaptive QIM with the step-size that is adaptively determined using the maximum value of the frequency magnitude response of every frame. The watermark is extracted by calculating the Euclidean distance as the blind detection. The proposed method is robust against most of attacks of audio watermark benchmarking. For the Fourier attacks, the proposed method shows over 95% recovery rate.

The humpback whale song is one of the most complex, non-human, acoustic displays in the animal kingdom. In this paper, we analyze and synthesize the humpback song using additive synthesis which is one of the most powerful techniques for the analysis, modification, and synthesis of complex audio or speech signals. This method creates complex sounds by adding together individual sinusoidal signals called “partials.” A partial’s frequency and amplitude are each time-varying functions, so it is a more flexible version of the harmonic associated with a Fourier series decomposition of a periodic waveform. Applying the fast Fourier transform to all overlapping frames (small time segments), we can detect peaks from the frequency spectrum of each frame and calculate the frequency, magnitude, and phase for all the peaks. These extracted parameters are then used as components of the sinusoidal signals (partials) for the synthesis process. This process finally reconstructs and concatenates each frame, generating the synthesized humpback song. We observed that this synthesized song resembles much more closely the original humpback song by the time/frequency domain representation and listening. In the future, we will analyze and synthesis other baleen whale songs with this powerful synthesis method. [Work supported by IITA (IITA-2008-(C1090-0801-0039)).]