What to do
Start the microphone, stay quiet for a few seconds, then capture a reading. Compare again after changing one source of noise.
Noise Level Meter
Observe digital microphone signal levels in dBFS. This is not a calibrated measurement of room sound pressure in dB SPL.
Approximate Noise Floor—dBFS
Digital signalNot measured
Live Level0
Dominant Freq0Hz
Local history
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How to use this test
What to look for
The dBFS reading is relative to a digital signal’s maximum. Gain and noise suppression can change it.
Web Audio analyzes the microphone signal after you grant access. dBFS describes digital signal level; it is not calibrated sound pressure in dB SPL. Gain, noise suppression, distance, and room noise affect readings.