Select Unprocessed vs Voice Recognition microphone option on S23 Ultra

[Larry]

Hi all, I'm using a Samsung Galaxy S23 Ultra and I noticed that using another audio recording app, the Unprocessed audio stream seems like it is reasonably... unprocessed on my system, where I think the system is applying auto gain control to the voice recognition input (as noted by some other user). I noticed that the app was recently updated to not use this channel due to issues, but I'm wondering if it's possible to try switching back manually to see if it improves accuracy.

I calibrated (dB only) the microphone at a certain signal level, but it appears to cause it to be inaccurate in other instances. 

Thanks!

[Julian Bunn]

AudioTool uses the "VOICE_RECOGNITION" mic data stream, as you noted, which is supposed, according to the Android specification, to exclude all filtering and AGC.

The "UNPROCESSED" mic stream is relatively new in Android. It sounds suitable for acoustic measurements, but we found that it does not do what it should on some devices, which is to provide an unprocessed stream, and also the signal levels on some devices were too low.

This mic stream data is a tricky detail, as we are at the mercy of what the phone manufacturer's do in their firmware. I'm against an option to choose between the two above, as it will just cause confusion.

Julian 

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