[Lab] Audio Spectrum display

Justin Slootsky justin at slootsky.org
Mon Feb 10 10:57:21 EST 2014

wow!  amazing pointers!  Thank you.  That MSGEQ7 looks like it would suit my needs very well.  Did you see the tutorial at: http://tronixstuff.com/2013/01/31/tutorial-arduino-and-the-msgeq7-spectrum-analyzer/ ?

----- Original Message -----
| From: "Justin Hornosty" <jjrh70 at gmail.com>
| To: "Justin Slootsky" <justin at slootsky.org>
| Cc: lab at artengine.ca
| Sent: Monday, February 10, 2014 10:41:16 AM
| Subject: Re: [Lab] Audio Spectrum display
| justin at slootsky.org writes:
| > I've been thinking about doing something like this, but a completely
| > different display method (individually addressable pixels in a line,
| > colour to denote frequency,  or if that just works out to too close to all
| > white, then pixels for a frequency, and vary the intensity...  Or
| > something)
| >
| >
| > http://m.instructables.com/id/LoL-Shield-Audio-Spectrum-VU-Meter/?ALLSTEPS
| I have been interested in making something like this myself (though just
| a regular spectrum analyzer.
| The FFT stuff for arduino seems interesting - never tried to run it
| myself, but I get the feeling the arduino would be way too slow.
| one of the common chips a lot of people use is the msgeq7 (
| https://www.sparkfun.com/products/10468 - little inflated price, I got a
| whole bunch of them for much cheaper off ebay)
| I was reading about the teensy3 audio adapter the other day,
| http://www.pjrc.com/store/teensy3_audio.html
| I think I'm going to pick one up at some point, the pjrc guy is actively
| writing code (I believe one of the demos at the moment is a spectrum
| analyzer)
| For dealing with the level stuff I wonder if you can get away with
| simply tweaking the fft code to decrease the levels so you aren't maxing
| it out the whole time. A lot of it might simply be the choice of
| microphone (and it's position) along with the input stage of the
| circuit. Someone with more knowledge in amplifier circuits might have
| suggestions for the 'correct' way to deal with this.
| Sounds like a interesting project :)
| -jjrh.

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