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TOPIC: MiniDSP16 Led Meaning

MiniDSP16 Led Meaning 3 months 3 weeks ago #39299

  • JimTal
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Hello
The 16 mic array board has an led near the usb connector and I do not know what it means when it is RED or BLUE. When powered up it flashes BLUE for 1/2 sec then back to RED. I have seen it turn BLUE and remain that color once or twice but usually it stay RED. Furthermore, I am not able to get much volume out of the mics so maybe it has some relation to the color of the led? I appreciate your input.
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MiniDSP16 Led Meaning 3 months 2 weeks ago #39488

  • devteam
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@Jim

That LED is simply for the booting process on the main board. No specific information relevant to your bootup I think.
The microphone have a high max SPL so if your signal is low, you might need to increase the sensivity by doing internal gaining inside your software. You do that with a bitshifting typically for a fixed gain value.

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Last Edit: 3 months 2 weeks ago by devteam. Reason: missing end of sentence.. :-)
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MiniDSP16 Led Meaning 3 months 2 weeks ago #39511

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You stated:
The microphone have a high max SPL so if your signal is low, you might need to increase the sensitivity by doing internal gaining inside your software. You do that with a bitshifting typically for a fixed gain value.

Hello, My signal is not low. I am speaking into the mic array (correct side up) within 10 cm at normal to high voice. The individual channel output is minimal. This image shows channel 1 output level: http://ibb.co/ypsxpXr. Is there a way to increase gain on the miniDSP? I do not have the software to adjust the speaker array gain.
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MiniDSP16 Led Meaning 3 months 1 day ago #39693

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@JimTal

Maybe a misunderstanding as to what we intended to say.
- MEMS are setup for High SPL so their sensitivity is LOW.
- Digital gain is the way we'd typically boost the signal .e.g. on the UMA8 DSP, we're doing bit shifting to solve that issue. We don't do any processing on the UMA16 I'm afraid... You'd have to do that digital gain inside your recording/application.
You seem to be doing this under Audacity? Simply amplify the signal there (manual.audacityteam.org/man/amplify_and_normalize.html)

Hoping this info helps.

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