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  • DD4WH's Avatar
    09-23-2022, 07:00 AM
    Congratulations!!! Very good. Thanks a lot for your detailed feedback and recommendations, which will help builders to check their builds and make them work :-). Have fun with the Teensy! Frank DD4WH
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    09-22-2022, 10:11 AM
    Yes, the microSoundRecorder sketch by WMXZ does allow to record audio without glitches on the T3.6. Search for it on github. You would have to merge the two sketches together, adapt them to the Teensy 4.0/4.1 and put a...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    09-22-2022, 10:07 AM
    It may help to read the instructions from my github: https://github.com/DD4WH/audio-guestbook Also make sure you understand whether your handset switch opens or closes on lifting the handset (and adjust the software...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    09-20-2022, 01:25 PM
    That is pretty normal behaviour! By using the standard Teensy audio lib modules, it is not possible to record audio without such glitches. A better SD card might help, but in most cases you have got to live with that.
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    09-19-2022, 01:54 PM
    Could you explain in detail what that means? What is "small parts", what is "recoding counting number" ? I do not understand what is going right and what is going wrong in your setup.
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    09-13-2022, 08:17 PM
    Please do not duplicate threads. Use the original thread. Use a wav with 44.1ksps sample rate Consider following the detailed instructions on https://github.com/DD4WH/audio-guestbook
    2 replies | 95 view(s)
  • DD4WH's Avatar
    09-13-2022, 05:14 AM
    In my github, I stated very clearly, that the code only works with T4.0 and T4.1
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    09-13-2022, 03:17 AM
    The code you use, is not the code from my github. There are several #ifdef for Teensy LC. I have only tried T4 and I doubt the code will run on Teensy LC
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    09-08-2022, 01:41 PM
    Probably you want to bypass the audio transformers, because they have much too low audio bandwidth. Did you exchange the sampling caps and OPAmp filter caps?
    3 replies | 94 view(s)
  • DD4WH's Avatar
    09-08-2022, 07:23 AM
    Great to hear! You probably know that there already is a Teensy implementation of an FT8 decoder, have a look here, maybe there is something useful in it. They use 32ksps and decimate by 5 to get the bin spacing right,...
    78 replies | 21294 view(s)
  • DD4WH's Avatar
    09-08-2022, 07:18 AM
    Maybe try to set sample rate to 192k or even higher. Also be sure that the CPU freq is 600MHz. Ensure that your hardware has NO RF lowpass filter. Most important, for QRP labs hardware, you have to change the sampling...
    3 replies | 94 view(s)
  • DD4WH's Avatar
    09-07-2022, 09:13 PM
    Bob, that is really fantastic and a long awaited feature. I can imagine the demodulation is even a lot more demanding! I have a lot of other obligations at the moment, so can't test this now, but can't wait until I...
    78 replies | 21294 view(s)
  • DD4WH's Avatar
    08-25-2022, 03:32 PM
    Excellent, thanks for the explanation, that clears many things up for me! When I find some more time, I will try to make the record buffer larger. If I remember correctly, I tested the SD cards a while ago and many of...
    19 replies | 522 view(s)
  • DD4WH's Avatar
    08-25-2022, 03:25 PM
    Same here, the #include <MTP_Teensy.h> is not in orange. But if you can compile the code, everything is fine with that lib. Did you set Tools --> USB type --> Serial & MTP Disk (Experimental) ? You have to do that...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-25-2022, 10:31 AM
    Thanks for your help! WORKING * I have the sketch working now on a Teensy 4.0 with PCM5102 and PCM1808 and SD card holder soldered with flying wires to the 4 bit SDIO port (Stereo WAV recording and Stereo WAV playback)...
    19 replies | 522 view(s)
  • DD4WH's Avatar
    08-24-2022, 03:22 PM
    Thanks a lot! Looks good, will test in the next days. Do I have to insert a yield(); in loop to make it work?
    19 replies | 522 view(s)
  • DD4WH's Avatar
    08-24-2022, 07:30 AM
    Very interesting! We are really in need for a more reliable way to record audio with the Teensy Audio library. At the moment, this is not possible without frequently occuring glitches and/or sample losses in the...
    19 replies | 522 view(s)
  • DD4WH's Avatar
    08-24-2022, 07:23 AM
    No, the Teensy audio board is necessary, because: * it has a built-in adjustable gain pre-amplifier for the microphone input * it has a good quality ADC * it has a good quality DAC (which the T4 does not have) The...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-24-2022, 07:19 AM
    You can try two things: * if you record the greeting message with the telephone itself (this is possible with the latest sketch), you can adjust the microphone preamp sensitivity in line of the sketch, so that the...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-18-2022, 02:10 PM
    Please do not create duplicate threads. If you build the Audio guest book, follow the instructions here: https://forum.pjrc.com/threads/70553-Teensy-4-0-based-Audio-Guestbook?p=311279&viewfull=1#post311279 If you...
    2 replies | 102 view(s)
  • DD4WH's Avatar
    08-18-2022, 06:30 AM
    Yes, please read ALL the instruction text here: https://github.com/DD4WH/audio-guestbook The sketch only works with Arduino 1.8.19 and Teensyduino 1.57 Please read carefully all the instructions, download the...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-16-2022, 07:34 AM
    The code has been updated again: * user configuration is now very easy, because I structured some precompile options at the top of the sketch 1.) does your handheld OPEN or CLOSE the switch when you lift the...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-15-2022, 06:50 PM
    There is now a new software version available: * it is now possible to record the greeting message directly on the phone the first time you use the telephone * the software checks whether there is a "greeting.wav"...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-09-2022, 06:16 PM
    Please read my last message...and follow the link and read.
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-09-2022, 06:04 PM
    Hi! Go here: https://github.com/DD4WH/audio-guestbook Scroll down to the section "Compiling the code" and follow the instructions 😀. Good luck and success! PS: check your sketchname for typo! Guest, not guist...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-05-2022, 09:34 AM
    As Mark mentioned, the buzzing will probably not be caused by the software, but the wiring of your microphone. You could try changing the following: * try to power the Teensy by a power bank. Do that in a room (or even...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-04-2022, 01:12 PM
    Not very elegant, but it is working . . . Make the inner (shielded) cable a little longer than the wound cable, so you have some flexibility. I added a special black microphone windshield foam to avoid pops in the...
    147 replies | 4899 view(s)
  • DD4WH's Avatar
    08-04-2022, 08:18 AM
    DD4WH replied to a thread FT8 on Teensy 4 in Project Guidance
    Charley W5BAA has programmed Pocket_FT8 on Teensy 3.6 and Teensy 4.1. It implements real-time decoding and coding FT8 signals for ham radio portable operation. Have not tried it yet, I am still waiting for...
    16 replies | 2080 view(s)
  • DD4WH's Avatar
    08-04-2022, 06:31 AM
    Hi! I will adress some of the issues mentioned in the posts above and try to give some potential solutions: AUDIO Quality / microphone: * if you use a new electret microphone capsule (and not the original telephone...
    147 replies | 4899 view(s)
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About DD4WH

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About DD4WH
Location:
Central Europe
Interests:
Software Defined Radio, Digital Signal Processing, Bat detection & bioacoustics

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