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在电子电工测量中,常使用dB为测量单位。先说声压。声压的大小表示声音的强弱,通常用帕(Pa)和微巴(μb)表示。1帕(Pa)=1牛顿/M~2;1微巴(μb)=1达因/CM~2人耳可以听到的声音,其声压范围一般是以1μb为中心,在0.0002～200(μb)的范围内变化,最大声压与最小可听声压相差一百万倍。研究表明,人耳的听觉并不是与声压成正比;人耳的感觉量是与刺激量的对数成正比的。所以一般都用声压与基准声压比的
In electrical and electronic measurements, dB is often used as the unit of measure. Let’s talk about sound pressure Sound pressure of the size of the voice that the intensity, usually with Pa (Pa) and micro-bar (μb) said. 1 Pa = 1 Newton / M ~ 2; 1 μB = 1 dyne / CM ~ 2 human ears can hear the sound pressure range is generally 1μb as the center in the 0.0002 ~ 200 (μb) within the range of change, the maximum sound pressure and the minimum audible sound pressure difference of a million times. Studies have shown that the human ear’s hearing is not proportional to the sound pressure; the amount of sensation in the human ear is proportional to the logarithm of the amount of stimulation. So generally use the sound pressure and the reference sound pressure ratio