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Microphone test

For the team: checks the device's microphone and its Bluetooth stream. Nothing here is analysed or uploaded.

Not connected

Level

Not connected
Level now
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Peak, last 2 s
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Background noise
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Clipped, last 2 s
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Waveform, last 3 s

Auto zoom keeps quiet breath sounds visible. Turn it off to see the real level (full height = full scale).

Checks

Record a test clip

10 seconds, kept on this phone only. Listen to it, or save it as a WAV: 8 kHz, 16-bit, the same format the AI gets.

What to try
  1. Tap the chest piece or the table next to the mic: the level should jump to −20 dBFS or more.
  2. Seal test: note the background with the chest piece lying on the table, then hold it firmly on your chest and stay still. A good airtight seal on the tube gives a clearly lower background.
  3. Breathe deeply with the chest piece on your chest: the waveform swells with each breath. Record a clip and listen.
  4. Range: walk away with the phone. The lost packets show where the connection gets weak.