A multichannel and multiple position adaptive room response equalizer in warped domain: Real-time implementation and performance evaluation |
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| Institution: | 1. Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy;2. DiSBeF, Università di Urbino “Carlo Bo”, Piazza della Repubblica 13, 61029 Urbino, Italy;1. Department of Engineering, Aarhus University, Finlandsgade 22, 8200 Aarhus N, Denmark;2. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0250, USA;1. Katholieke Universiteit Leuven, Laboratory for Acoustics and Thermal Physics (ATF), Department of Physics and Astronomy, Celestijnenlaan 200D, 3001 Leuven, Belgium;2. Katholieke Universiteit Leuven, Department of Mechanical Engineering, Celestijnenlaan 300 B, B-3001 Leuven, Belgium;3. Laboratoire Vibrations Acoustique, INSA-Lyon, 25 bis avenue Jean Capelle, F-69621 Villeurbanne Cedex, France;4. STU Bratislava, Faculty of Civil Engineering, Department of Building Structures, Radlinskeho 11, Bratislava, 813 68, Slovak Republic;1. School of Electronic Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. School of Electrical Engineering and INMC, Seoul National University, Seoul 151-742, Republic of Korea |
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| Abstract: | Room response equalization systems are used for improving the listening experience in cinema theatres, home theatres, car hi-fi systems. In this paper, an adaptive multichannel and multiple position room response equalization system and its real-time implementation are described. An adaptive and accurate estimation of the room responses is provided introducing a normalized least mean square optimization approach with a variable step-size, and taking advantage of an interchannel coherence reduction technique based on the missing fundamental phenomenon. Then, the equalizer is designed in warp frequency domain for improving equalization in the low frequency region, reducing the computational cost of the design procedure, and deriving an algorithm capable of working in real time. Indeed, a real-time implementation of the proposed adaptive equalizer has been obtained on NU-Tech framework and has been used in order to provide a deep objective and subjective evaluation of the equalization system. The results of these evaluations illustrate the effectiveness of the proposed approach, also in comparison with other techniques of the state of the art. |
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| Keywords: | Adaptive equalization Room equalizer Channel decorrelation Impulse response identification |
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