![]() ![]() Regardless, many years of observational data have confirmed its usefulness for environmental noise and predicting hearing damage. There is some debate relating to the accuracy of the A-weighted system's accuracy compared to human hearing and in complex noises. All modern sound meters can provide A-weighted decibel and C-weighted decibel (dBC) measurements. International Electrotechnical Commission 61672:2003 defines the electronics curves used in sound meters. Their work was later updated, and new curves were released as International Organization for Standardization ( ISO) 226. Their equal loudness curves were published as an American National Standards Institute standard in 1936. Research in perceptive loudness was started in 1933 by the team of Harvey Fletcher and Wilden Munson. 140 dBA: pain threshold, serious hearing damage possible, jet engine. ![]()
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