Abstract
In recent years, with the never ending progress in technology related to audio visual equipments and PC, etc., there is an increasing trends of using the reproduction sound of contents such as music and speech even for household purposes. Since all the phenomena occurring in nature need to be considered in relative frame of reference, a pleasant and enjoyable sound to the listener may appear as a noise to the people (non-listener) around the owner of sound player. Therefore, the aim of the present work is to develop a sound field control technology which confined the sound field to the listener only. Then, the authors propose a method to change attenuation ratio so that sound pressure level remain same in the near field, but its level reduces in the far field. By setting up the acoustic impedance barrier with multiple error sensors on the side, the sound attenuation level on the side is improved. Based on the experiment and theoretical estimation the performance of the present technique is verified.
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