In audio engineering, the speed and precision of loudspeaker directivity measurement is intrinsic to product development. Conventional methods for individual measurements are time consuming and may delay progress in loudspeaker design and evaluation. Our novel approach speeds up this process without sacrificing accuracy, using standard lab equipment of existing configurations. By utilizing a continuously rotating loudspeaker, our method quickly generates a full 360-degree directivity map, significantly reducing the conventional time required for comprehensive assessments. Our method uses the Normalized Least Mean-Square (NLMS) adaptive filter algorithm to identify rotating impulse responses and to reject turntable noise. In doing so, it delivers nearly infinite spatial resolution in the azimuth direction, thus offering detailed insights into loudspeaker performance across angles and frequencies. Extensive analysis with two fundamentally different loudspeaker devices confirms our methods effectiveness, allowing for rapid directivity evaluations in about a minute, which is a drastic improvement over the hours needed with traditional approaches. This advancement facilitates quicker product iterations and design, leading to enhanced acoustic quality in audio products from smart speakers to mobile devices.
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https://aes2.org/publications/elibrary-page/?id=22579
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