如果要用仪器测量声音的响度级,必须模仿人的听觉幅频特性。根据响度级的定义可知,响度计应该由测量声音声压级的“声(压)级计”插入模仿人的听觉幅频特性的计权网络组成。一般选取三种计权特性来代表人的听觉幅频特性。如图1所示,国际电工委员会(IEC)规定A、B、C三条曲线代表人的听觉幅频特性的计权特性:A计权曲线是模仿声压级在(0～30)dB时人的听觉幅频特性;B计权模仿声压级在(30～60)dB时的听觉 If you want to use instruments to measure the loudness level of the sound, you have to imitate the human hearing amplitude-frequency characteristics. According to the definition of loudness level, we can see that the loudness meter should be composed of a weighting network that mimics the human hearing amplitude-frequency characteristics of the sound pressure level meter of sound pressure level measurement. Generally choose three weight characteristics to represent the human hearing amplitude-frequency characteristics. As shown in Figure 1, the International Electrotechnical Commission (IEC) states that the three curves A, B, and C represent the weighting characteristics of the hearing amplitude-frequency characteristics: A The weighted curve is a model that simulates the sound pressure level at (0-30) dB B-weighted sound pressure level at (30 ~ 60) dB of hearing