Emi ToyodaChief, Architectural Acoustics Division at the Kobayasi Institute of Physical Research. Since joining the institute in 2002, she has mainly conducted research in the field of architectural acoustics. Her work focused primarily on measuring the acoustic properties of materials, including sound absorption coecients and sound transmission loss. Her goal is to help improve indoor acoustic environments through research on methods for measuring and evaluating acoustic materials.Inventor:Emi Toyoda, Satoshi Sugie, Junichi Yoshimura, Masaharu Ohya, Yuichi YonemotoApplication number: Japanese Patent Application No. 2009-197524 (P2009-197524)Filing date:August 28, 2009Date of publication of application:April 15, 2010Rion offers a precision sound level meter (NA-28) specifically designed for architectural acoustics measurement. This patent originated from a consul-tation with the Rion team developing this sound level meter. The consulta-tion involved a simple impulse sound source for measuring reverberation time. In general, reverberation time measurements require relatively large systems consisting of omnidirectional loudspeakers, power amplifiers, and other equipment to provide sucient acoustic output. In contrast, the NA-28 was designed with an emphasis on eciency in field measurements. We aimed to further enhance its porta-bility by combining it with a simple sound source.Simple impulse sound sources have a long history. Typical examples include balloon bursts and starter pistols used in track and field events. While balloons and starter pistols are easy to carry around, balloons have to be inflated and starter pistols have to be reloaded with blanks for every measurement. Neither balloons nor blanks can be reused, so they are not very convenient. What we wanted was a sound source capable of repeatedly generating sounds at a similar output level with minimal effort. I was wrestling with this rather difficult problem when I suddenly remembered the origami poppers I used to play with as a child. They were made by folding a sheet of newspaper or a flyer into a shape that makes a loud popping sound when snapped downward. Thinking back, Rion has contributed to society by applying for and registering numerous patents.This feature introduces the aspects that make these inventions so special.Part 3 introduces a unique invention that makes use of the principle of a traditional Japanese origami popper.12Japanese Patent 5495677 No.A traditional Japanese origami popper and the sound pressure waveform it createsthese origami poppers could be used repeatedly because they could quickly be folded back into shape after each use. I immediately set to work, relying on childhood memories to make and test an origami popper. I was surprised to find that it produced a much louder sound than I had remembered. I felt confident that I had my answer. But I also discovered that a stan-dard origami popper isn’t a suitable for use as a sound source in acoustic measurements as-is. Since origami poppers generate an impact sound when the two inward-folded pockets open rapidly, two impulse responses are observed in quick succession. So I first needed to modify the design to create a single pocket that would produce a single impact sound. I made multiple prototypes by varying the paper type, thickness, and size, and ultimately developed the Origami Impulse Source.Origami Impulse SourceCompared with conventional simple sound sources, the Origami Impulse Source produces sufficient output and offers high reproducibility. In the mid- and high-frequency ranges, it exhibits relatively uniform directivity characteristics. We confirmed that it Inspired by a Traditional Japanese Origami Popper—the Origami Impulse SourceA Method for Measuring Impulse Sound Sources and Reverberation TimeTHE PATENTPatents Obtained by Rion—The Patent Registration NAVI:Part 3
元のページ ../index.html#14