神コテから学ぶ ID:w4AczS0L

http://i02.c.aliimg.com/img/ibank/2014/410/436/1852634014_1361166082.jpg
http://i04.c.aliimg.com/img/ibank/2014/135/122/1855221531_1361166082.jpg
http://i04.c.aliimg.com/img/ibank/2014/712/032/1855230217_1361166082.jpg
びーえー
http://i02.c.aliimg.com/img/ibank/2015/207/354/2158453702_1361166082.jpg
http://i02.c.aliimg.com/img/ibank/2015/414/527/1980725414_1361166082.jpg
http://i04.c.aliimg.com/img/ibank/2014/490/329/1633923094_1361166082.jpg

8hrs ……………………| 90dB
6hrs ……………………| 92dB
4hrs ……………………| 95db
3hrs ……………………| 97dB
2hrs ……………………| 100dB
1 1/2hrs ………………| 102dB
1hr………………………| 105dB
30min …………………| 110dB
15 min or less ………| 115dB
おんあつ
https://jhaudioblog.files.wordpress.com/2012/07/noise-chart.jpg