Using two mics at the same time

[Wolkie]

Hi all,

I'm making an app for a school project and I'd like to use two mic channels at the same time. So I want to visualize both mics and there respective input (just the decibels). I want to acces an external mic that is plugged in via the audio jack and I want to use the mic on the phone itself. Is there a way to make both mics listen?

I also have a splitter. Maybe I could hook two mics up on that and use two external mics?

I hope someone can help me!

 

[Deleted User]

I assume you'll be using MediaRecorder for this. Looking at the Javadocs, you use MediaRecorder.AudioSource to set the input source. The choices are DEFAULT or MIC, not both.
If you did hook up two external mics, then I suspect the audio of both would be combined. You'd have to experiment to find out what happens.

https://developer.android.com/reference/android/media/MediaRecorder

 

[lvt]

You might need a special hardware and its own app to monitor the sound levels. Not all phones have real dual microphones. The second microphone is usually used for noise cancelling feature.

 

[Deleted User]

Nice. I wonder how the separation of the two mic signals is done, I mean programmatically. Obviously it's possible, as the graphic there shows two signal sources.

 

[Wolkie]

View attachment 137831

You might need a special hardware and its own app to monitor the sound levels. Not all phones have real dual microphones. The second microphone is usually used for noise cancelling feature.

The apps shows it's possible. I want to use an external mic so then I would have access to two real mics.

 

[Wolkie]

I assume you'll be using MediaRecorder for this. Looking at the Javadocs, you use MediaRecorder.AudioSource to set the input source. The choices are DEFAULT or MIC, not both.
If you did hook up two external mics, then I suspect the audio of both would be combined. You'd have to experiment to find out what happens.

https://developer.android.com/reference/android/media/MediaRecorder

Thanks! Will look into it!

 

[lvt]

There is a stereo splitter that allows you to plug two microphones to a single 3.5mm jack, but I don't know if it will work with an Android phone or there is an app for it. It's designed mainly for a computer's sound card with an editing software.