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  • chipaudette's Avatar
    07-23-2020, 12:52 PM
    Github (or similar) is definitely the way to go. If you've never used a version control system before, it's not a trivial thing to get into, but it is totally totally totally a skill worth having. Alternatively, one...
    12 replies | 337 view(s)
  • chipaudette's Avatar
    07-16-2020, 11:12 AM
    Regarding SD recording, you can use the Tympan software library with anyone's hardware, as long as it is a Teensy 3.5 or Teensy 3.6. The library is a floating point extension of the Teensy Audio library. One of the...
    17 replies | 325 view(s)
  • chipaudette's Avatar
    07-16-2020, 11:05 AM
    Regarding the Tympan, it already has the Teensy 3.6 built into it. We buy the Teensy 3.6 bootloader from Paul (the maker of Teensy) and use the same processor and all that. Therefore, it *is* a Teensy 3.6 with the...
    17 replies | 325 view(s)
  • chipaudette's Avatar
    07-15-2020, 04:04 PM
    While the Teensy Audio Shield is amazing for its price, there are alternatives if you want better performance... * Blackaddr has his "Teensy Guitar Audio Shield". IMO, it sounds much better than the Teensy Audio...
    17 replies | 325 view(s)
  • chipaudette's Avatar
    07-14-2020, 08:18 PM
    Oh, so we *are* talking about frequency domain processing. When I measured FFT vs FIR based processing on the T3.6 using the ARM CMSIS Float32 library, FIRs are more efficient up to around 96 points. By the time you...
    32 replies | 877 view(s)
  • chipaudette's Avatar
    07-14-2020, 05:13 PM
    I'm a bit confused by your statement "in order to substitute the standard FIR filtering with convolution filtering". When convolution is done in the time domain, convolution *is* FIR filtering, right? How is...
    32 replies | 877 view(s)
  • chipaudette's Avatar
    07-13-2020, 09:56 PM
    To partly answer my own question, I know that long FIR filters can have a role in creating reverb/echo effects. For example, if you want to go out and actually measure the reverb/echo in a real physical space (like a...
    32 replies | 877 view(s)
  • chipaudette's Avatar
    07-13-2020, 09:46 PM
    Regarding this side-track about super-long FIRs...why would someone want a 65536-tap FIR for audio processing? Even running at a 96 kHz sample rate, this gives a resolution of about 1.5 Hz (or maybe closer to 2.5 Hz if...
    32 replies | 877 view(s)
  • chipaudette's Avatar
    07-08-2020, 01:57 PM
    You said that you wanted to be able to change the block size... In my Float32 extension of the Audio library (for our "Tympan" project), I made the blocksize adjustable. While I did not make the USB code compatible...
    15 replies | 1028 view(s)
  • chipaudette's Avatar
    06-30-2020, 03:46 PM
    The existing envelope class is written for fixed point math (as is the rest of the audio classes), which makes it hard for me to see what it's doing. It also makes it hard for a person like me to try alternatives. ...
    10 replies | 487 view(s)
  • chipaudette's Avatar
    06-25-2020, 11:16 AM
    If you use a regular delay with a fixed dealt time (like is currently in the library) you would get a more 'analog-style' delay if you could smoothly vary / modulate the sample rate of the whole system. That gets you...
    5 replies | 277 view(s)
  • chipaudette's Avatar
    06-25-2020, 11:07 AM
    The short answer (which is not helpful) is that you can do anything you want...but it could take a lot of development and effort. The longer answer is that you could modify the delay class to allow for better...
    5 replies | 277 view(s)
  • chipaudette's Avatar
    06-07-2020, 06:04 PM
    Hi folks, As usual, that version of my float32 library isn't updated very often as all of my active development is in the Tympan repo: https://github.com/Tympan/Tympan_Library The Tympan repo is also a float32...
    2 replies | 147 view(s)
  • chipaudette's Avatar
    06-04-2020, 12:35 PM
    Thanks, everyone for the suggestions and the photos. With this help, I got it to work! I disconnected my wiring for Pin6 and made my wiring look more like Paul's. Digital values were clearly banging away on the...
    28 replies | 996 view(s)
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