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声级计是噪声测量的一种基本仪器。在噪声控制工程中,了为使声音的客观物理量与人耳的听觉特性相一致,人们在声级计中设置了三条计权网络(如图)。C网络是效仿100方等响曲线,整个可听频率基本不衰减,常以此代表总声压级。B网络是效仿方70方等响曲线,低频(500Hz以下)有衰减。A网络是效仿40方等响曲线,它较好的模仿了人耳对低频率段声音不敏感,而对1000～5000Hz高频声敏感的特点,现在
Sound level meter is a basic instrument for noise measurement. In the noise control project, in order to make the objective physical quantity of the sound consistent with the auditory characteristics of the human ear, people set up three weighting networks in the sound level meter (as shown in the figure). C network is to follow the 100-side equal-loudness curve, the audible frequency basically does not decay, often to represent the total sound pressure level. B network is to follow the side of the square 70 curve, low frequency (below 500Hz) attenuation. A network is to follow the 40-way equal-loudness curve, which better imitates the human ear is not sensitive to the low frequency sound segment, and the high frequency of 1000 ~ 5000Hz sound-sensitive features, and now