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A spectral shaping technique is adopted to expand the operating frequency range for DWT-based blind audio watermarking. The process is performed framewisely over the 3rd level approximation subband, of which the spectrum spans from 0 to 2756 Hz. The effectiveness of the proposed scheme is demonstrated using the perceptual evaluation of audio quality and bit(More)
This paper presents a novel scheme to adaptively determine the embedding strength for audio watermarking using quantization index modulation (QIM) in discrete wavelet packet transform (DWPT) domain. While the DWPT facilitates the signal analysis, the employment of a psychoacoustic model helps to not only acquire appropriate quantization steps for watermark(More)