Occasional builder, good mechanical and computer skills, minimal electronics skills but very interested

New Hampshire and Colorado
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This user joined on 12/14/2020.

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WTPfeffer wrote 12/18/2020 at 01:46 point

And thanks Kris for the tip on the MEMS microphones - they close close to what I'd want, although I'm now searching for an analog equivalent of those components.


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Kris Winer wrote 12/18/2020 at 16:56 point

There are a few, maybe Knowles has one, but they won't be as sensitive as PDM.

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WTPfeffer wrote 12/18/2020 at 01:04 point

Hi Simon - Yes, I saw your replies (and thanks! The links are useful).  I am not yet very familiar with how this site works, so I'm not sure why my question isn't visible....

I did discover that my iPhone with the Røde iXY microphone can pick up frequencies right up to 20 KHz - still not in the ultrasound range but higher than I can hear.  More work required!

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Simon Merrett wrote 12/18/2020 at 09:53 point

@WTPfeffer if you start typing @simo you should see my profile pop up. Click that and it should "mention" me in brown/gold font. Then I should get a notification. Are you willing to try a microcontroller? I think it might be a good way to ensure your sampling hardware can definitely detect 20+ kHz. I'm not sure a PC audio card is designed for ultrasonic (but if you check the specs on yours it may prove me wrong).

Whatever hardware you use, I'd suggest looking at a fast Fourier transform (FFT) algorithm in your software to identify the relative amplitudes in different frequency bands. I don't think you will be able to do this by analysing the raw waveform visually, on an oscilloscope (unless it has frequency analysis functions built-in). 

Happy to keep discussing but I might reply faster if you @mention me. 

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Kris Winer wrote 12/17/2020 at 23:37 point

Maybe take a look at the TDK ICS41350...or ICS41352

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Simon Merrett wrote 12/18/2020 at 09:55 point

I never ignore a sensor suggestion by @Kris Winer ! Thanks. 

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Simon Merrett wrote 12/14/2020 at 21:45 point

Hi, did you remove your .stack question about the ultrasonic mic? I put some links in reply but can't see the listing when I go to the stack. Let me know if you can see them. 

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