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  • chipaudette's Avatar
    10-17-2019, 08:31 PM
    I want a MIDI shield. MIDI In/Out/Through. Along with the MIDI hardware, the board should have assorted through-hole solder points for attaching analog sensors or whatever. Nothing fancy, just through-holes. Also,...
    36 replies | 728 view(s)
  • chipaudette's Avatar
    10-14-2019, 06:42 PM
    Or, instead of Tympan, you could consider buying the BC127 module that's available from Sparkfun and wiring it to your Teensy 4.0 + Audio shield. Or you could consider any other BT Audio capable BT module. In the...
    9 replies | 142 view(s)
  • chipaudette's Avatar
    10-14-2019, 06:20 PM
    I think that the Tympan Rev D will do this. The Tympan is aimed at open source hearing aid algorithms, but in reality, it is a general purpose digital audio platform. Full Disclosure: I'm part of the Tympan team....
    9 replies | 142 view(s)
  • chipaudette's Avatar
    10-09-2019, 07:48 PM
    No. But if you can point me to it, I'll learn something! Chip
    137 replies | 14450 view(s)
  • chipaudette's Avatar
    09-25-2019, 11:11 AM
    chipaudette replied to a thread Bat detector in Audio Projects
    Lowpass filtering at Nyquist is not nearly as important for the sigma-delta ADCs used in audio codecs (such as the Teensy Audio board). Try it for yourself...run a frequency sweep into the board, one that extends above...
    529 replies | 37349 view(s)
  • chipaudette's Avatar
    09-24-2019, 03:24 PM
    chipaudette replied to a thread Bat detector in Audio Projects
    Note in my blog post how I show the spectrum of the self noise with and without the HP filter engaged. My two spectra reveal the chacteristics of the noise added by that HP filter: several very strong narrowband peaks....
    529 replies | 37349 view(s)
  • chipaudette's Avatar
    09-24-2019, 03:06 PM
    chipaudette replied to a thread Bat detector in Audio Projects
    If you're curious, I did a self-noise analysis of the Teensy Audio board for a subset of the audible frequency range (not ultrasound)... http://openaudio.blogspot.com/2017/03/teensy-audio-board-self-noise.html Chip
    529 replies | 37349 view(s)
  • chipaudette's Avatar
    09-24-2019, 02:34 PM
    chipaudette replied to a thread Bat detector in Audio Projects
    I love to see people getting quantitative. Fantastic. As some friendly improvements: * The term "signal to noise ratio" (SNR) is typically used instead of "contrast". You define what you consider to be your input...
    529 replies | 37349 view(s)
  • chipaudette's Avatar
    09-21-2019, 09:21 PM
    The input impedance to most audio ICs is in the 10-40 kOhm range, which is too low for the output of guitar pickups. Guitar pickups really expect to be plugged into something with at least 500 kOhm (and it's often...
    55 replies | 3600 view(s)
  • chipaudette's Avatar
    09-16-2019, 07:58 PM
    With the Teensy 4, I've gotten stereo audio to flow on both the STGL5000 and on my AIC3206. With the Teensy 3.6, I've got 4-channel audio to flow on both the STGL5000 and with my AIC3206. Now, I'd like to move to...
    71 replies | 5227 view(s)
  • chipaudette's Avatar
    09-09-2019, 03:45 PM
    Great! Has anyone tried 4-channel audio with the Teensy 4.0, yet? (I've done two channels by lashing up one Audio Adapter, but I haven't tried two. Too scared!) Has anyone tried it? Chip
    2 replies | 236 view(s)
  • chipaudette's Avatar
    09-09-2019, 02:44 PM
    In one of the Teensy 4 threads, there was a discussion of a revision to the Teensy Audio Adapter Board to be compatible with Teensy 4....not just adding the 100 ohm resistors, but actually making it compatible with the...
    2 replies | 236 view(s)
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