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  • 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 | 122 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 | 122 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 | 14254 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...
    527 replies | 36265 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....
    527 replies | 36265 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
    527 replies | 36265 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...
    527 replies | 36265 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 | 3521 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 | 4975 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 | 216 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 | 216 view(s)
  • chipaudette's Avatar
    08-19-2019, 09:06 PM
    Presumably, for this function: void setI2SFreq(int freq), the "freq" is the sample rate (in Hz) that I want? So, if I want 44100 (ie, the default), I would call setI2SFreq(44100)? But, if I wanted 48 kHz, I would...
    5 replies | 440 view(s)
  • chipaudette's Avatar
    08-19-2019, 03:34 PM
    Hi All, Previously, I made an extension of the audio library to enable float32 audio processing for the Teensy 3.5/3.6 (see Tympan library here). With Teensy 4, a bunch of stuff has changed, which I'm working...
    5 replies | 440 view(s)
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