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hello everyone
how to understand the parameter of a differential microphone for example IM73A135V01,
the sensitivity is measured under 1Pa peak of 1Pa rms ?
there are two outputs of the microphone, but acoustic specification only have one value ,
for example, the sensitivity -38dBV is for each output ? so if using this microphone , the total sensitivity is -32dBV?
AOP 135 dBSPL is measured on each output respectively or the difference of the two outputs ?
thank you!
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Hi, zyshi
After discussing with internal engineers, the answer to the question is as follows.
1. Both the sensitivity and the AOP are tested by the output value of (OUT+ - OUT-);
(The first answer may not very clear)
2. Considering the way for testing, two outputs forming a differential out, for the final output the AOP can not exceed 135 dBSPL.
Thank you,
Neo Lu
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Hi, zyshi
Thank you for your questions, and there some suggestion for these questions.
1. The sensitivity is measured under 1Pa peak of 1Pa rms ?
- The sensitivity is tested by following procedures:
- One-way or coaxial speakers are used as test speakers.
- The microphone should face the speaker perpendicularly
- The microphone should be suspended by thin wires or mounted on very small circuit boards.
- Sensitivity may also be measured against common variables such as temperature to measure stability of the microphone.
2. There are two outputs of the microphone, but acoustic specification only have one value , AOP 135 dBSPL is measured on each output respectively or the difference of the two outputs ?
Two outputs can form a differential output which is more robust against disturbances.
AOP is measured on each output respectively.
Hope that will help you,
Neo Lu
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Hi Neo
thanks for your reply.
amnother two question for IM73A135V01 ,
1 the sensitivity -38dB is measured on each output respectively ?
2 the two outputs forming a differential out, for the final output the AOP can exceed 135 dBSPL ?Because the differential structure can improve THD performance.
Thank you!
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Hi, zyshi
After discussing with internal engineers, the answer to the question is as follows.
1. Both the sensitivity and the AOP are tested by the output value of (OUT+ - OUT-);
(The first answer may not very clear)
2. Considering the way for testing, two outputs forming a differential out, for the final output the AOP can not exceed 135 dBSPL.
Thank you,
Neo Lu
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Hi Neo
thank you for your reply.
zy