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Acoustic Design of NHK HD-520 Multichannel Postproduction Studio - A New Approach for Room Acoustic Design Using Multi-Layered Random Diffusers

In this paper, a novel approach for room acoustic design adopting the renewal project of NHK HD-520 multichannel post-production studio is introduced. HD-520 studio is designed for direct surround loudspeaker arrangements based on ITU-R BS.775-1 [1] and adopting an acoustically transparent screen. Generally, there are three important keys for acoustic design of multichannel post-production studios. The first is to obtain the stable and flat low frequency responses. The second, smooth panning and accurate phantom sound image, and the third, natural sounds which have the well-balanced frequency characteristics. To resolve these problems and produce a superior monitoring environment, a new approach for room acoustic design using multi-layered random diffusers with cylindrical diffusers of different sizes(MLRD) is applied for this project. First of all, an outline and the acoustic design concept for the renewal of NHK HD-520 studio are introduced. Second, the concrete method for room acoustic design for the purpose of certifying the high quality for monitoring of both audio and picture is introduced. The preferable acoustic characteristics were shown in the measurement results, and a high reputation has been given by engineers for the comfortable work area for a surround monitoring environment.

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