Audio Engineering

Microphone Sensitivity & Self Noise

The Music Telegraph | Text 2019/01/15 [12:32]
Audio Engineering

Microphone Sensitivity & Self Noise

The Music Telegraph| 입력 : 2019/01/15 [12:32]

▲ This is a graph showing the Microphone Sensitivity of two microphone headsets at a wide range of frequencies. In this graph, you can see the Gain that each headset picks up at each frequency from 20Hz to 20KHz. Both headsets were subject to the same signal, meaning they were subject to the same exact sound pressure level. From looking at this graph, the red line, the NC-181 Headset, has higher gain sensitivity than the blue line, the ANC 750 Headset, at all ranges of frequencies except for the very low frequencies, from about 20Hz to 150Hz. Therefore, overall, spanning the bandwidth of frequencies, the NC-181 has superior microphone sensitivity, or gain, than the ANC 750. Keep in mind, though, that though a microphone headset may have better sensitivity than another one, it doesn't necessarily mean that it's a superior headset. There are still other parameters, or tests, that must be examined, such as the EMI noise a microphone headset picks up or its noise cancellation ability, to conclude which microphone headset is superior.   

© Learning About Electronics

 

 



Microphone Sensitivity & Self Noise

 

 

Sensitivity:

- How efficiently convert acoustic energy into electronic energy in microphone

 

 

 

Noise exists in all equipments:

- A more sensitive Mic will require less amplification at the microphone preamp ==> This will reduce noise in the signal path

- More sensitive Mic ==> “S/N” (Signal-to-Noise ratio) is higher 

 

 

*Keep in mind that two microphones (Sensitive one & Dull one) together will work better for you:

==>If we use sensitive Mic and dull Mic together, we can get two different nuances at a time

 

 

 

To control ‘hissle’ (High Frequency noise):

- Find the 'hissle' area with a sensitive microphone (e.g. Neumann U89), then eliminate these high frequency hissle with EQ

 

 

 

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