Stow, OH (May 22, 2006)–Audio-Technica digital engineer Vladan Bajic presented a technical paper titled “Adaptive Filters in Wavelet Transform Domain” (Convention Paper 6716) yesterday afternoon at the 120th AES European Convention in Paris, France. The paper session was followed with an associated poster presentation this morning, in which convention visitors will have the opportunity to discuss the topic with Bajic.
Vladan Bajic In “Adaptive Filters in Wavelet Transform Domain,” Bajic presents performance comparisons between two methods of implementing adaptive filtering algorithms for noise reduction, namely the Normalized time domain Least Mean Squares (NLMS) algorithm and the Wavelet transform domain LMS (WLMS). A brief theoretical development of both methods is explained, and then both algorithms are implemented on a real-time Digital Signal Processing (DSP) system used for audio signal processing. Results are presented showing the performance of each algorithm both in time and frequency domains. Noise reduction effects produced by different algorithms are shown across the spectrum, and distorting effects are analyzed. Trade-offs of convergence speed versus added noise are analyzed. Overall results show convergence speed improvement when using WLMS algorithms over the NLMS algorithm.
Bajic was born in Novi Sad, Yugoslavia in 1974. He received his B.S. degree in Electrical Engineering from Youngstown State University, Youngstown, OH, in 1997, and his M.S. degree in Electrical Engineering from the University of Akron, Akron, OH, in 2005. Bajic previously worked for Dublin Technical Systems in Dublin, OH, on microprocessor-based control systems. In 2001 Bajic joined Audio-Technica U.S., Inc., as digital engineer. His research interests include adaptive algorithms, noise canceling and audio DSP processing. Bajic has been involved in microphone and audio DSP systems design, development, measuring and production.
Commenting on Bajic’s presentation at 120th AES European Convention, A.T.U.S. vice president, R&D/Engineering, Jackie Green stated, “It’s very exciting to have Vladan, who is a member of A-T’s team of talented R&D engineers, present his technical paper this month at the AES Convention in Paris. We’re extremely fortunate to have Vladan as part of the A-T design group and are proud that he carries on our tradition of contributing to the science of audio engineering.”