What is MATLAB for Android Device microphone input data unit?
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Dear community,
I've recently seen the newly introduced "Microphone Sensor" input for MATLAB mobile. When I enable the microphone of my smartphone in MATLAB, I see that the "Level dB" value almost always has a "negative" sign. What is the "level" here? Is it "Sound Pressure Level" or something else? If it is the "Sound Pressure Level", what is the reference pressure level for dB calculation?
I undrestand that the output of the Microphone sensor may differ from device to device and I believe there may be a calibration constant in mV/mPa (or sth. like that). May be we can do that conversion via Post-processing.
I wonder if there is a built-in or a programmatic method to get SPL signal from the microphone.
Best regards.
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Adit Kirtani
2023-3-24
Hi Halil,
For your first question, the level bar indicates sound being received by the microphone. You can read into it at this documentation page:
We can definitely, amplify our audio signal as required, here is a handy MATLAB Community Post:
For your final question, I would suggest the splMeter class. Here is it’s documentation page:
I hope this helps,
Adit Kirtani.
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