4常见问题 PROBLEN
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  经常有些采购,在采购咪头(传声器)的时候,对“灵敏度”理解不了,现在,简单的分析如下:
  灵敏度是指传声器在一定强度的声音作用下输出电信号的大小。灵敏度高,表示传声器的声一电转换效率高,对微弱的声音信号反应灵敏。技术上常用在0.1pa[μBar(微巴)]声压作用下传声器能输出多高的电压来表示灵敏度。如某传声器的灵敏度为1mV/μBar,即表示该传声器在1μBar声压作用下输出的信号电压为1mV。
  习惯上也常用DB来表示传声器的灵敏度。
  一般灵敏度有-48~-66DB(国内标准);国家标准的-34DB相当于国内标准的-54DB.
  即一般为:-28~-48DB
  麦克风灵敏度的定义是馈给1pa(94dB)的声压时,麦克风输出端的电压(dBV)。
  所以-30dBV/Pa的麦克风的灵敏度比-42dBV/Pa的麦克要高很多。
  MIC灵敏度是指输出电压同麦克风所受声压得复数比。通常情况下定义传声器在1帕声压时输出端的输出电压为1V时的灵敏度为0dB。
  麦克风的灵敏度就是以这个标准为基准得出的一个相对值:Lm=20lgVm/Vs,Vs=1v,Vm为麦克风在1帕时输出的电压。
  另外,麦克风的灵敏度的dB通常是指dB/V,除此之外,还有一个单位也是简称dB的,即dB/bar,两者之间的关系是-30dB/bar=-50dB/V,
  通常情况下,耳机上用的麦克风的灵敏度不能太高,一般是在-50dB/V以下,故可能的一种情况是主板MIC为-42dB/V,耳机上的MIC为-30dB/bar,
  MIC灵敏度是固定指标,是指在标准偏置下测出的。产商可改变工艺或者材料来提高。用户在使用中不可降低,如果用户偏置不正确,会产生失真和带宽挤压,表现为灵敏度降低。

Some purchases are often made. When purchasing microphones (microphones), the "sensitivity" cannot be understood. Now, simple analysis is as follows:
Sensitivity refers to the size of the output electrical signal of a microphone under the action of a certain intensity of sound. The high sensitivity means that the microphone has high sound-electric conversion efficiency and is sensitive to weak sound signals. It is technically common to use 0.1pa[microbars] sound pressure to measure how high the microphone can output the voltage. If the sensitivity of a microphone is 1mV/μBar, it means that the signal output by the microphone under the effect of 1μBar sound pressure is 1mV.
DB is also commonly used to indicate the microphone's sensitivity.
The general sensitivity is -48~-66DB (domestic standard); the international standard -34DB is equivalent to the domestic standard -54DB.
That is generally: -28 ~ -48DB
The microphone sensitivity is defined as the voltage (dBV) at the output of the microphone when a sound pressure of 1 Pa (94 dB) is fed.
Therefore, the sensitivity of the -30dBV/Pa microphone is much higher than that of the -42dBV/Pa microphone.
The MIC sensitivity refers to the complex ratio of the output voltage to the sound pressure received by the microphone. It is usually defined that the microphone has a sensitivity of 0 dB when the output voltage of the output terminal is 1 V at a sound pressure of 1 bar.
The sensitivity of the microphone is a relative value based on this standard: Lm = 20 lgVm/Vs, Vs = 1 V, and Vm is the output voltage of the microphone at 1 Pa.
In addition, the sensitivity of the microphone dB is usually referred to as dB / V, in addition to a unit also referred to as dB, dB / bar, the relationship between the two is -30dB / bar =-50dB / V,
Under normal circumstances, the sensitivity of the microphone used on the headset can not be too high, generally below -50dB/V, so a possible situation is the motherboard MIC is -42dB/V, the MIC on the headset is -30dB/bar,
MIC sensitivity is a fixed indicator and is measured at standard bias. Producers can change processes or materials to improve. The user cannot reduce the user's use. If the user's offset is incorrect, it will cause distortion and bandwidth squeeze, which shows a decrease in sensitivity.
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