Resumo

GARCIA HERNANDEZ, José; NAKANO MIYATAKE, Mariko  e  PEREZ MEANA, Héctor. Real-Time MCLT Audio Watermarking and Comparison of Several Whitening Methods in Receptor Side. Comp. y Sist. [online]. 2007, vol.11, n.1, pp.61-75. ISSN 2007-9737.

A Real-Time audio watermarking scheme is proposed, where the strength of audio signal modifications is limited by the requirement of producing an output audio signal that is perceptually equal to the original one. The watermark embedding stage, based on a spread spectrum algorithm operating in the Modulated Complex Lapped Transform (MCLT) domain, inserts a watermark that is generated using a private key which modeled according to the Human Auditory System (HAS). The proposed blind detection approach is based on the Additive White Gaussian Noise (AWGN) channel theory; and to achieve this goal several whitening methods in the receptor side were evaluated. Evaluation results show that the proposed watermarking embedding scheme is robust to common attacks such like, D/A and A/D conversion, filtering, additive noise and high quality MPEG audio coding.

Palavras-chave : Audio watermarking; copyright protection; Modulated Complex Lapped Transform; DSP implementation; whitening methods.