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  1. Replies
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    Thanks for being so open and clear in your...

    Thanks for being so open and clear in your statements! I totally agree to most of them :-).

    However, I would like to emphasize a few things:

    * it was the original author of the code, who...
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    I am a little puzzled by the mentioned problem of...

    I am a little puzzled by the mentioned problem of severe recording problems (slowing down, speeding up, large parts of audio lost etc.).

    I have built four of these audio guest books, with T4.0 and...
  3. Not sure, what you would exactly try to achieve:...

    Not sure, what you would exactly try to achieve: do you have the actual measured impulse response of your amp (and transformed into minimal phase form) OR do you have the EQ response (your picture)...
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    Bob, that looks excellent! Especially the idea of...

    Bob, that looks excellent! Especially the idea of having such a test generator is superb and provides one with the necessary tool to test the FT8 decoder!

    The sensitivity figure you give is...
  5. With the help of Lang Elliott and Harold Mills I...

    With the help of Lang Elliott and Harold Mills I was able to implement their "simple" time domain overlap-add (OLA) pitch shift algorithm.

    It works surprisingly well for pitch shifting bird songs...
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    no, the freqs are correct. WFM --> LO is one...

    no, the freqs are correct.
    WFM --> LO is one third of the Rx freq
    AM, SSB etc. --> LO is 4 times the Rx freq
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    . . . you are mixing up the standard mode of...

    . . . you are mixing up the standard mode of reception (SSB, CW, AM etc.) and the non-standard way (WFM)

    STANDARD: The QSD uses a LO freq that is 4x the Rx freq
    NON-STANDARD: the QSD uses a LO...
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    Hi! Did you exchange the sampling caps and OPAmp...

    Hi!
    Did you exchange the sampling caps and OPAmp filter caps, so that the bandwidth of the hardware quadrature sampling detector is around 200kHz ?
    Did you bypass the output audio transformer ?...
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    Congratulations!!! Very good. Thanks a lot for...

    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...
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    Yes, the microSoundRecorder sketch by WMXZ does...

    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...
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    It may help to read the instructions from my...

    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...
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    That is pretty normal behaviour! By using the...

    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...
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    Could you explain in detail what that means? What...

    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.
  14. Please do not duplicate threads. Use the...

    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
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    In my github, I stated very clearly, that the...

    In my github, I stated very clearly, that the code only works with T4.0 and T4.1
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    The code you use, is not the code from my github....

    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
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    Probably you want to bypass the audio...

    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?
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    Great to hear! You probably know that there...

    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...
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    Maybe try to set sample rate to 192k or even...

    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...
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    Bob, that is really fantastic and a long awaited...

    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...
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    Excellent, thanks for the explanation, that...

    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...
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    Same here, the #include is not...

    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) ?...
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    Thanks for your help! WORKING * I have the...

    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...
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    Thanks a lot! Looks good, will test in the next...

    Thanks a lot! Looks good, will test in the next days.

    Do I have to insert a
    yield(); in
    loop to make it work?
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    Very interesting! We are really in need for a...

    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...
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    No, the Teensy audio board is necessary, because:...

    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...
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    You can try two things: * if you record the...

    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...
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    Please do not create duplicate threads. If you...

    Please do not create duplicate threads. If you build the Audio guest book, follow the instructions here:...
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    Yes, please read ALL the instruction text here: ...

    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...
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    The code has been updated again: * user...

    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...
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    There is now a new software version available: ...

    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...
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    Please read my last message...and follow the link...

    Please read my last message...and follow the link and read.
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    Hi! Go here:...

    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!...
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    As Mark mentioned, the buzzing will probably not...

    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...
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    291062910729108 Not very elegant, but it is...

    291062910729108

    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...
  36. Thread: FT8 on Teensy 4

    by DD4WH
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    Charley W5BAA has programmed Pocket_FT8 on Teensy...

    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...
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    Hi! I will adress some of the issues mentioned in...

    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...
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    Have a look here:...

    Have a look here:
    https://github.com/DD4WH/audio-guestbook
    That code plays only the most recent message, not all the messages. It would be easy to modify it to play all the messages in reverse...
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    * Best connection of the Teensy and audio board...

    * Best connection of the Teensy and audio board is through headers. Do not use cables for that connection, the connections have to be as short as possible.
    * for the button connections every wire...
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    Sticky: Thanks Paul for that excellent information on...

    Thanks Paul for that excellent information on Teensyduino 1.57 in your blog article.
    This made it possible for me for the first time to successfully implement MTP access to the SD card on an audio...
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    Very good that you solved the SD card formatting...

    Very good that you solved the SD card formatting issue!

    I modified the original code further:

    * added MTP support: now you can access the recorded WAV files on the SD card via USB, the SD card...
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    Yes. As stated in my previous message, this can...

    Yes. As stated in my previous message, this can be expected, if the standard Audio lib Record example is used. Most SD cards take too long to respond and have write latencies up to a few hundred ms,...
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    Here is my working version: * tweaked for a...

    Here is my working version:

    * tweaked for a telephone with closing contact when lifting up the handheld
    * saving recorded messages as WAV files to the SD card, eliminating the need to convert RAW...
  44. Pitch shift, frequency shifting, vocoder and granular effect for bird song listening

    Many people suffer from high frequency hearing loss, especially people above the age of 50. Lang Elliott had the idea of lowering the pitch of bird songs with a special device in order to help bird...
  45. Ethan, what was your Timed Recording pattern?...

    Ethan,

    what was your Timed Recording pattern?

    That LED pattern in your video indicates that the Teensy is not able to mount your SD card. That explains why there is no value above 0 in the...
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    Come on, its not so difficult to find . . . Try...

    Come on, its not so difficult to find . . .
    Try Title 47 of the Code of Federal Regulations . . .
  47. You are clearly wrong with that statement!...

    You are clearly wrong with that statement!
    Connecting an antenna to a Teensy pin (without any further hardware) can make the Teensy an illegal transmitter with much more power than is legally...
  48. Perfect, thanks Walter!

    Perfect, thanks Walter!
  49. OK. This probably means that after the deep sleep...

    OK. This probably means that after the deep sleep of the recorder, the SD card is not successfully mounted again (fast blinking indicates a problem with the SD card mounting: intended to indicate...
  50. Ethan, I have a suspicion regarding your problem...

    Ethan, I have a suspicion regarding your problem of the recorder not starting after having gone into deep sleep:

    * does the Teensy LED blink when the recorder has stopped recording ?
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