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4G-IOT Microphones

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Published in 2018-5-26 17:49:32 | Show all floors |Read mode
Is it possible for both the on-board microphone and the microphone in the audio jack to be used simultaneously with two different audio sources?  This is the last question I'm seeking an answer on before I go ahead with a purchase for a large project.

Also, I created a Discord server for people to chat about and share help with Orange Pi products, and other development software/hardware.  You can join it here:

https://discord.gg/N4qyzuf

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Published in 2018-5-28 01:25:33 | Show all floors
I have not specifically checked the 4G-IOT, but it is almost always the case that an on-board mic and audio in jack are independent of each other.  I don't have mine plugged in but it is easy to look and see if there are separate audio devices in /sys. From the datasheet diagram there are two I2S channels going to the MT6328. One channel would be for the on-board mics, the other for the audio jack.

Do note the change in the product specifications:
http://www.orangepi.org/Orange%20Pi%204G-IOT/
The cellular on this board does not work in the Americas, and it only supports a single common EU band.
The supported bands are the standard bands used in China.

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 Author| Published in 2018-5-30 13:56:18 | Show all floors
Hi jonsmirl.  Thanks very much for replying.  It's good to know that there's a very good likelihood of the mic and jack being independent.  Now I just need to work out the pinouts for the 40-pin connector.

I see there are two variants of the 4G-IOT, and they cover different regions of the world.  It might be that I can get coverage as required by switching between models as customers require it.

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Published in 2018-5-30 20:24:39 | Show all floors
He has not made any of the "optional" band boards. Not clear if he ever will. Plus those aren't the optimal bands for USA anyway.
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