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    On Performance Of Linear Adaptive Filtering Algorithms In Acoustic Echo Control In Presence Of Distorting Loudspeakers

    • B.TECH / M.TECH / M.SC / PH.D

    •  GANGADHAR.T

    • 12 Months ago

    Echo attenuation obtained using linear adaptive filtering algorithms in the presence of distorting loudspeaker are discussed. Experimental evidence is given that, when the acoustic echo path is almost linear, computationally complicated algorithms (such as RLSor APA) give considerable better echo attenuation than normalized LMS, but this is not the case when there are considerable nonlinearities (i.e. acoustic distortion) in the echo path.

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    A Robust Audio Multi-watermarking algorithm Based on Vector Quantization

    • B.TECH / M.TECH / M.SC / PH.D

    •  GANGADHAR.T

    • 12 Months ago

    Combined with zero-watermarking technology, a novel robust audio multi-watermarking algorithm based on index characteristics of the efficient VQ compression technique is proposed. We make use of the relativity of the neighboring indices to calculate the variance and mean, then generate the polarities by considering these properties. The permuted watermarking information loads on the corresponding polarity sequences to generate the secret keys, which have to be sent to copyright licensing bodies for registering.

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