Other Mic solutions - Absolute SPL calibration

[Brad Leonard]

Has any other more professional mics or interfaces been tested with Audiotool such the hardware from Studio Six Digital? I have a Samsung Galaxy Note 10 with a USB-C port. I am looking to use a mic that can be absolute SPL calibrated with a tone generator calibrator in addition to the frequency calibration that all of the cheaper mics are concerned with. Has anyone successfully done this with Audiotool? I can't be alone in this desire.

[Zinze1956]

Go to discussion of 30/11/2019 Be aware of your phone's mic AMP response flatness it might be very poor
Regards
Fabrizio Azzini

[Brad Leonard]

Thank you, I am more interested in using USB Audio with the app. Can Android/Audiotool support a USB audio source on a phone such as a UMIK-1 or a Utestmic?

[Fabrizio Azzini]

Hi,

My Huawei p8 support audio usb but not all usb audio card are supported. I have a creative card (but audiotool support only 44.1 Khz but other programs no) and another external with Texas chip PCM2912 (I HAD TO MODIFY some internal pin connection because its too high gain and noise as you can understand from the datasheet...anyway it is very flat as you can read in my replay post) 

Il mar 4 feb 2020, 15:40 Brad Leonard <bradtl...@gmail.com> ha scritto:

Thank you, I am more interested in using USB Audio with the app. Can Android/Audiotool support a USB audio source on a phone such as a UMIK-1 or a Utestmic?

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[Fabrizio Azzini]

Naturally you must connect the two devices with an OTG cable

[Brad Leonard]

So unless you someone else has tried a USB source with my specific phone model it really comes down to trial and error?

[Julian Bunn]

On modern Android phones, USB microphones should just work with AudioTool or any other app that uses a microphone.

For global calibration, what I do for e.g. the iMM-6 is first apply the cal file, and then use a pistonphone (reasonably priced on Amazon, for example) to check the SPL level. Since the pistonphone is generating a known dB at 1kHz, and since the iMM-6 cal file levels are relative to 0dB correction at 1kHz, then I can simply calculate the difference between what AudioTool sees and what the pistonphone level is, and use that as the global offset.

There may be better ways: I am not an acoustic engineer, so YMMV :-)

Julian

On Tue, Feb 4, 2020 at 2:58 PM Brad Leonard <bradtl...@gmail.com> wrote:

So unless you someone else has tried a USB source with my specific phone model it really comes down to trial and error?

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[Brad Leonard]

Julian, thanks for jumping. I am interested in using something like the UMIK-1 to connect directly to the USB-C port of my Note 10 (with a USB-A to USB-C Adapter). I would then use sound level calibrator such as the Reed Instruments R8090 (SC-05) Sound Level Calibrator for 1/2" Diameter Microphones to calibrate the absolute SPL with the "Offset Calibration Function." This would rule the need for any calculations other than finding the difference from measured and the value that the calibrator puts out. It was also rule our inaccuracy in using comparative calibration from a side by side SPL meter.  From what you explained, it seems like this should work. What you think?

I was not able to find a pistonphone on Amazon.

On Tuesday, February 4, 2020 at 4:06:03 PM UTC-8, Julian wrote:

On modern Android phones, USB microphones should just work with AudioTool or any other app that uses a microphone.

For global calibration, what I do for e.g. the iMM-6 is first apply the cal file, and then use a pistonphone (reasonably priced on Amazon, for example) to check the SPL level. Since the pistonphone is generating a known dB at 1kHz, and since the iMM-6 cal file levels are relative to 0dB correction at 1kHz, then I can simply calculate the difference between what AudioTool sees and what the pistonphone level is, and use that as the global offset.

There may be better ways: I am not an acoustic engineer, so YMMV :-)

Julian

On Tue, Feb 4, 2020 at 2:58 PM Brad Leonard <bradtl...@gmail.com> wrote:

So unless you someone else has tried a USB source with my specific phone model it really comes down to trial and error?

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[Julian Bunn]

Hi Brad,

Yes, I think that would all work fine. The calibrator I bought was this one:

https://www.amazon.com/Decibel-Calibrator-Calibration-Measurement-Microphones/dp/B0786YDF62/ref=sr_1_3?crid=1RYCVRH0KBIWO

Julian

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[Brad Leonard]

. ItSince this conversation from a couple of years ago Saramonic has come out with this USB-C mic preamp. I am wondering if anyone has tested this with an android phone and a competent reference mic such as the Behringer ECM8000 it seems like this would be a good combo with a calibrator? Anyone try this yet?

https://saramonicusa.com/smartrig-uc-professional-audio-interface-with-xlr-1-4-inputs-for-usb-type-c-android-smartphones-tablets-pcs-more/