Forum Rule: Always post complete source code & details to reproduce any issue!
Tab Content
  • MikeDB's Avatar
    08-20-2019, 12:23 PM
    Yes I was assuming good PCB design. Resistors on all tracks (or configuring the internal ones on STM MCUs) right near the source (which remember is at the other end sometimes !) is always best, but if you don't have...
    50 replies | 2462 view(s)
  • MikeDB's Avatar
    08-20-2019, 08:49 AM
    The other interfaces aren't as critical as in this case they are all just allowed to settle and then clocked in by MCLK so it is this line that it is essential there are no reflections. STMicroelectronics MCUs have...
    50 replies | 2462 view(s)
  • MikeDB's Avatar
    08-18-2019, 02:06 AM
    MikeDB replied to a thread USB midi issues. in Audio Projects
    Try unplugging everything else using USB on the PC. Hard I know as that includes the mouse and keyboard, but my guess is that something is transmitting constantly whereas on a laptop most things are internal.
    5 replies | 161 view(s)
  • MikeDB's Avatar
    08-17-2019, 01:23 PM
    Another rather expensive alternative is the CY15B104Q: 4-Mbit (512 K 8) Serial (SPI) F-RAM. It's in a slightly different 8 pin package and haven't checked the actual pinout, but will give you 4 times the length as...
    26 replies | 5635 view(s)
  • MikeDB's Avatar
    08-16-2019, 12:19 PM
    Any plans for a larger Teensy4.5/6 later like the 3.5/6 to overcome the pinouts issue ? I suspect a lot of people may prefer that for such a powerful processor.
    50 replies | 2462 view(s)
  • MikeDB's Avatar
    08-16-2019, 11:00 AM
    I hadn't read the datasheet yet (my Teensy hasn't even arrived) but if you are saying that OUT2/3/4 can be made into inputs that's fantastic news. A small complete digital mixer on a Teensy !
    50 replies | 2462 view(s)
  • MikeDB's Avatar
    08-16-2019, 09:04 AM
    My Teensy4 hasn't arrived yet, but I've been assuming the use of OUT1A, OUT1B, OUT1C and OUT1D together with MCLK1, BCLK1 and LRCLK1 wukk give a standard 4 channel I2S. I wasn't going to use OUT2 or it's MCLK and other...
    50 replies | 2462 view(s)
  • MikeDB's Avatar
    08-14-2019, 11:59 PM
    http://www.dspguide.com You can't beat the price !! And the quality is there as well.
    7 replies | 246 view(s)
  • MikeDB's Avatar
    08-14-2019, 09:45 PM
    Ok took me a while but try this. It won't be absolutely correct but should give you a strategy. For k=1 calculate phaseadjust as you are doing so you need a starting cos() and sin() values. Now if you rewrite the...
    12 replies | 475 view(s)
  • MikeDB's Avatar
    08-14-2019, 01:25 PM
    Fair enough, but the OP did ask about running something far more complicated, probably using the Wavelet transform. The Teensy4.0 should be more than powerful enough for what you are doing and hopefully you'll get...
    12 replies | 475 view(s)
  • MikeDB's Avatar
    08-14-2019, 10:17 AM
    Yeah I've been interested in audio for about fifty years and was at Soundcraft for a time 20 years ago. Now I design stuff on contract but have been thinking about doing my own brand. Being DSP agnostic is good. ...
    12 replies | 475 view(s)
  • MikeDB's Avatar
    08-14-2019, 04:07 AM
    Hi Jay. Yes the Pi is used for real time audio. Two cores run Linux. I try to make one do all general housekeeping whilst the other focuses on input control - MIDI, HID, etc. The other two cores are (supposedly)...
    12 replies | 475 view(s)
  • MikeDB's Avatar
    08-13-2019, 09:17 PM
    Great thanks. I assumed they would be /Program and /Off but it would have helped if it was documented somewhere.
    4 replies | 162 view(s)
  • MikeDB's Avatar
    08-13-2019, 08:32 PM
    I've ordered a Teensy 4.0 which will arrive in a couple of weeks but am designing a PCB to put it on already. But I've failed to find anything in the documentation online saying which way up the Program and On/Off...
    4 replies | 162 view(s)
  • MikeDB's Avatar
    08-13-2019, 08:28 PM
    Whilst the Teensy 4.0 is powerful, having tried something similar on an STM32H750 which is of similar performance, I think you will struggle. I've migrated to a Pi4 for high powered audio processing.
    12 replies | 475 view(s)
  • MikeDB's Avatar
    08-13-2019, 08:24 PM
    I really wouldn't bother with the MQSL/R pins. A new definition of 'Medium Quality Audio' from NXP I'm afraid. Cheapest solution is probably to buy one of those $1 USB audio dongles and then rip off the USB - there's...
    5 replies | 209 view(s)
No More Results
About MikeDB

Basic Information

Statistics


Total Posts
Total Posts
16
Posts Per Day
1.77
Last Post
Teensy 4.0 I2S Support 08-20-2019 12:23 PM
General Information
Last Activity
Yesterday 09:28 PM
Join Date
08-13-2019