The Evolving World of Acoustics and Vibration TechnologiesThe N-1101 Compact Sound Level MeterOwned by Rion Co., Ltd.Photo by Yuki AkabaIn 1955, Rion introduced the N-1101 compact sound level meter, a model with a measure-ment range of 45–130 phons. The product was developed using technologies Rion employed in the manufacture of acoustic products like microphones, earphone sensors, and hearing aids, combined with research results from the Kobayasi Institute of Physical Research. The hourglass-type sound source for calibration was developed as an accessory.Winning widespread acclaim, the N-1101 was adopted by municipal governments for noise pollution mitigation efforts and by researchers in the fields of noise control and industrial hy-giene. Since then, Rion has collaborated with the Tokyo Metropolitan Research Institute for Environmental Pollution and other administra-tive agencies, as well as the Kobayasi Institute of Physical Research, to develop and provide superior sound level measuring instruments.The World Of AcousticsThe World Of Acoustics
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