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  1. Replies
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    on the STM32 we do not use such things as "audio...

    on the STM32 we do not use such things as "audio libs" at all. It is just one interrupt/DMA system that gathers the audio blocks and all the processing is done inside a loop.

    The Convolution SDR...
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    Totally agreed! Yes, that would be great! Some...

    Totally agreed! Yes, that would be great! Some thoughts:

    * I am puzzled how to use the floating point lib by Chip in combination with the frequent updates of Teensyduino. So, how could one switch...
  3. Sorry, that was my fault, I thought he was...

    Sorry, that was my fault, I thought he was overall head. Its good to be as accurate as possible, especially in these times.
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    Hi Joe, with the standard audio lib you could...

    Hi Joe,

    with the standard audio lib you could use

    * biquad filters
    * FIR filters

    with a bit more fiddling you could use the audio lib queue object to obtain your audio blocks and do...
  5. just listened to the excellent daily podcast with...

    just listened to the excellent daily podcast with Christian Drosten, the boss of the Charité in Berlin, one of the leading virologists in Europe...
  6. Thanks, Walter, for inserting the date correction...

    Thanks, Walter, for inserting the date correction into the code!

    In the meantime, I managed to repair my github repo and made a PR for two other small mods:

    * blink LED when there is no SD card...
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    Hi Peter, thats quite strange. If you have...

    Hi Peter, thats quite strange.

    If you have HARDWARE_DD4WH_T4 uncommented:

    #define HARDWARE_DD4WH_T4

    then the compiler should find tft, because it is defined in line 938.

    Are you sure,...
  8. sorry, my github repo shows strange behaviour,...

    sorry, my github repo shows strange behaviour, need some more time to repair this, but I have some other work to do at the moment. If you want to include the change without a PR, go ahead.
  9. @WMXZ, yes, and the bug is only present in leap...

    @WMXZ, yes, and the bug is only present in leap years. I could not make it run when first setting day and then time, it is two days in advance in that case.

    I was not able to find the bug in...
  10. I am experiencing a strange phenomenon with the...

    I am experiencing a strange phenomenon with the current microSoundRecorder code (master branch):

    * when I try to synchronize the time and date with the micro_SRcontrol.exe program, the date seems...
  11. The CMSIS documentation says...

    The CMSIS documentation says (https://www.keil.com/pack/doc/CMSIS/DSP/html/group__RealFFT.html) the real length N FFT uses a buffer of size N (because it holds the complex output values of a length...
  12. Fully agreed, Walter. But if you want to use the...

    Fully agreed, Walter. But if you want to use the CMSIS functions for real FFT, you do not save memory because the CMSIS function still wants a buffer of the same size as in the complex FFT (even...
  13. As I mentioned, using a real-to-complex FFT with...

    As I mentioned, using a real-to-complex FFT with the CMSIS functions will not save memory (because the output buffer has to be two times the length of the FFT and you need a separate input buffer: in...
  14. @hoho: sorry, but you would have to explain more...

    @hoho: sorry, but you would have to explain more precisely what you are trying to do. The original code applies an impulse response to the left audio channel and the same impulse response is applied...
  15. A great idea to perform FT8 decoding on the...

    A great idea to perform FT8 decoding on the Teensy!

    Would love to see that! However, as far as I can see, this is not a particularly easy task, but I found some code on github, which looks rather...
  16. Try the code inside the folder...

    Try the code inside the folder guitar_cabinet_impulse: copy all the files into a folder, not only the .ino-file
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    Solder your boards together, or do it like Frank...

    Solder your boards together, or do it like Frank proposed in post #19 and #21
    It is highly likely that your wires do not give reliable contact.
  18. Which Teensy version did you choose in...

    Which Teensy version did you choose in Teensyduino? Which Teensyduino version do you use? Which sketch did you use? Give complete code or EXACT link to the code.
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    My recommendation: try to spend a little more...

    My recommendation: try to spend a little more time on digesting and reading than on replying to posts.
    here is the requested connection of the PCM1808 that works with the T4:...
  20. Please read post #91 your question is also...

    Please read post #91
    your question is also answered in the code itself in the comments
  21. Frank and Tim already said everything necessary...

    Frank and Tim already said everything necessary to eventually come to a success, but I think this photograph can back it up [but you only use ONE audio board ;-)]:
    ...
  22. Not sure what kind of program you mean that I put...

    Not sure what kind of program you mean that I put together in 2016!? But I never prepared anything for the T3.5!?

    If you want to use the ARM CMSIS lib with the T3.6, follow exactly the steps...
  23. The code should work with the Teensy audio shield...

    The code should work with the Teensy audio shield without problems. Did you try it?
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    Yes, the PCM1808 works out-of-the-box with the...

    Yes, the PCM1808 works out-of-the-box with the Teensy audio library, no problem and great audio !

    I do not know the differences between PCM1808 and PCM1802, however.
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    Another option would be to use an I2S microphone...

    Another option would be to use an I2S microphone breakout board.

    The ICS43434 delivers excellent audio results if you care about a little filtering of the 3.3V supply.
    ...
  26. you can also use separate ADC/DAC for audio. I...

    you can also use separate ADC/DAC for audio. I use the ADC PCM1808 and the DAC PCM5102a (quite cheap modules of both are available on the internet), which seem to use the same I2S protocol as the...
  27. How would you sample the IF? With a 1MSPS ADC?...

    How would you sample the IF? With a 1MSPS ADC? Does the Teensy 4.0 ADC support a sample rate of 1 MHz ? I do not know. If yes, how would you proceed? You would have to decimate the signal (perhaps...
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    try resoldering every single solder joint under...

    try resoldering every single solder joint under magnification and carefully check every solder joint under magnification glasses.

    In the photos you can see several weak or faulty solder joints,...
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    @Jim: thanks for your info! I am not sure if...

    @Jim: thanks for your info!

    I am not sure if it will be possible to use the R820T tuner. As far as I understand, one would have to sample the IF with at least 20Msps (IF == 10MHz) and then run a...
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    @MICUPRE: sorry to hear about your blown-up T3.6...

    @MICUPRE: sorry to hear about your blown-up T3.6 !

    Before connecting a new T3.6 to your current setup I would carefully check it. I do not understand fully your connection diagram, however there...
  31. Hi Ted, from your sound file I understand that...

    Hi Ted,

    from your sound file I understand that you would like to change the playback speed, but you do not care about maintaining the original pitch during playback. Is that right?

    If so, your...
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    Hi Jim, your SDR setup looks quite familiar to me...

    Hi Jim, your SDR setup looks quite familiar to me ;-). Great that it works and that you find it useful. BTW, the current version does not make full use of the T4 power, it already works great with...
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    Jean-Marc, thanks a lot for your code to make...

    Jean-Marc,
    thanks a lot for your code to make the chip work!
    I tested it with Teensy 4.0 @600MHz & audioshield rev. D with PSRAM [ESP PSRAM64H] soldered to the audio shield
    and Arduino 1.8.10 and...
  34. Hi Brian, I recently learned a bit about...

    Hi Brian, I recently learned a bit about different licenses: it seems (if I understood correctly) that GPLv3 (the license I use for all my code and which is also used by Warren Pratt for the wdsp...
  35. you most probably have wrong connections, because...

    you most probably have wrong connections, because the mic has separate output and Vdd pads!!

    Have a look at the data sheet page 6.

    I am afraid nobody can be of more help unless you post...
  36. It would be good, if you tested the following...

    It would be good, if you tested the following audio lib example: examples/HardwareTesting/PassThroughStereo.ino

    Uncomment the following:


    const int myInput = AUDIO_INPUT_MIC;

    Connect...
  37. Brian, your code runs and performs very well!...

    Brian, your code runs and performs very well! Well done, thats very good!

    I added some very small modifications in the example file --> AUDIO_BLOCK_SAMPLES, Serial printing processor load, fixing...
  38. Hi Brian, thats excellent news!!! Congrats! I...

    Hi Brian,

    thats excellent news!!! Congrats! I wont have time to have a look at and test this until the weekend. Very good that you were able to optimize both processor load and latency.

    I will...
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    It was YOU who put out the term "pro-audio...

    It was YOU who put out the term "pro-audio circles" ;-) --> #10

    Come on, I am not interested in fairy tales, give me something where I can learn, is there anything you guys published so we can...
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    Thats interesting. Did those "pro-audio circles"...

    Thats interesting. Did those "pro-audio circles" publish anything (possibly peer-reviewed?), so that others can participate in your knowledge?
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    Yes, blind audition tests reveal how much of the...

    Yes, blind audition tests reveal how much of the dynamic range you are able to hear, good young ears (younger than 25 years !) are capable of 120dB of dynamic range, which is about 20 bits.

    But an...
  42. @highly: maybe this is what you need? ...

    @highly: maybe this is what you need?

    https://forum.pjrc.com/threads/58054-CMSIS-5-3-0-and-CMSIS_DSP-1-7-0-on-teensy-4?p=219628&viewfull=1#post219628

    to be honest, I have not understood from...
  43. Brian, that sounds good! I dont think, the...

    Brian, that sounds good!

    I dont think, the compiler is so smart to use the CMSIS routines. No, it probably doesnt. But AFAIK the CMSIS routine does the same as I did: not using one loop with an...
  44. @Brian: that sounds really really good, that...

    @Brian: that sounds really really good, that would be a major achievement to have a partitioned convolution audio object!

    @highly: hard to say whats going wrong, but it seems you misunderstood the...
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    Bit depth: Your ADC PCM1808 will hardly be able...

    Bit depth: Your ADC PCM1808 will hardly be able to really represent 24bits: according to the data sheet it has an SNR of 99dBA, which translates into an effective resolution of about 16bit. So,...
  46. Have a look at the "record queue"-object, which...

    Have a look at the "record queue"-object, which allows you to send realtime audio data from an input (eg. the internal ADC) to the queue object.

    You will find an example how to use this object in...
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    Thanks neurofun! That low budget µSD card adapter...

    Thanks neurofun! That low budget µSD card adapter worked out of the box when I tried it with a T4 and FrankBs MP3 library! Nice idea and realization :-)

    Thanks for providing the pictures in post...
  48. extend Queue object for Teensy 4.0 to more blocks

    There was a need for more audio blocks to be queued in my Teensy 4.0 SDR project in order to use larger FFT sizes for steeper filtering [I needed 64 blocks of 128 samples at each time for...
  49. Thread: Teensy 3.6

    by DD4WH
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    Read this: ...

    Read this:

    https://www.pjrc.com/store/teensy36_pins.html

    If you want to waste your time or money and you want your project to be unreliably working or even not working at all, yes, then you...
  50. thanks for the hints on where to get the T4 audio...

    thanks for the hints on where to get the T4 audio board, will try it there.

    I added the code for T3.6 convolution code to the github.

    Have fun with the Teensy!
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