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  1. Replies
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    Hi Jim, sorry, there is no wiring diagram, but...

    Hi Jim,

    sorry, there is no wiring diagram, but there is plenty of information on the Internet for low-IF SDRs like this.

    There is some more information in the pdf to the Teensy SDR...
  2. Thread: Bum 3.6?

    by DD4WH
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    I would recommend to resolder all of your solder...

    I would recommend to resolder all of your solder joints underneath the Teensy under magnifying glasses or a stereo microscope.

    I can see some partly unsoldered or looking "cold", eg. pins 17, 18,...
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    Hi Peter, now thats strange, did you use the...

    Hi Peter,

    now thats strange, did you use the latest version from my github? It has the following in line 191 which should work:


    extern "C"
    {
    void sincosf(float err, float *s, float *c);
    }
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    I am not sure about the requirements of a VOX...

    I am not sure about the requirements of a VOX application, but I think a signal level measurement should be sufficient. You will not be that far from the mic in order to make reliable communication?...
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    No, unfortunately not. I spent many hours on that...

    No, unfortunately not. I spent many hours on that and have not succeeded in performing reliable I2S In and Out with the Teensy 4.0.

    The very same hardware (Teensy Audio Shield, PCM1808 & PCM5102)...
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    Teensy 4.0 I2S crackling noise

    I have been trying to use the Teensy 4.0 with the PJCR Teensy Audio shield to get I2S audio input and output.

    The audio shield was soldered with very short wires (< 2cm) and 100 Ohms series...
  7. As far as I understand, it is indeed necessary in...

    As far as I understand, it is indeed necessary in order to cancel out the opposite sideband in SSB. But if I understand it correctly, in the Convolution filter, the complex filtering of both channels...
  8. Hi Derek, thats very interesting stuff! For me...

    Hi Derek,

    thats very interesting stuff! For me as a non-engineer, there are a few points that are not easily understandable:

    1.) SSB: Where is the Hilbert transform in Fast convolution...
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    I have to apologize, I did not read your post...

    I have to apologize, I did not read your post well: you wanted PCBs, here they can be purchased:

    https://aisler.net/daba/are-ssr-1/are-ssr-2

    You can also contact Dante via this thread:
    ...
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    It is all here: ...

    It is all here:

    https://github.com/do7jbh/SSR-2

    Dante DO7JBH has his own software that runs on his hardware, but the Teensy Convolution SDR also runs on his hardware.
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    Unfortunately, I have to say that the crackling...

    Unfortunately, I have to say that the crackling noise returned. I made numerous attempts to cure that by returning to sample rate 44100sps, by inserting different resistor values into the MCLK line,...
  12. Hi Derek, I am really impressed, that seems a...

    Hi Derek,

    I am really impressed, that seems a really nicely structured SDR layout! I will soon make an attempt to try it out!

    However, when compiling, "Streaming.h" is missing. Where can I find...
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    @bicycleguy: looks good! My working setup is very...

    @bicycleguy: looks good! My working setup is very similar! How high can you tune up the sample rate until your setup gives distorted audio?
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    Just one thing to add: we have exactly the same...

    Just one thing to add: we have exactly the same phenomenon of I2S synch error with the following hardware combinations for our Software Defined Radio Software UHSDR:

    STM32F4 & WM8731
    STM32F7 &...
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    @Blackaddr: Thanks a lot! After hours of...

    @Blackaddr: Thanks a lot! After hours of searching for my issue, I resoldered all connections and now the T4 & audio shield combination seems to work reliably up to 120ksps sample rate. With higher...
  16. hi Brian, re: 1.) have a look at ...

    hi Brian,
    re: 1.) have a look at

    https://github.com/g0orx/wdsp/blob/master/firmin.c

    line 243: "k = (k + a->idxmask) & a->idxmask;"

    I am not sure how I should interpret that (and maybe this...
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    Blackaddr, thanks a lot for your detailed...

    Blackaddr, thanks a lot for your detailed explanation!

    OK, I now understood the difference between the I2C and the I2S problems ;-). But I am still struggling with my problems, could not cure them...
  18. Brian, thats excellent news! I am far from...

    Brian, thats excellent news! I am far from understanding the code by Warren Pratt from his wdsp lib, so playing around until the result is what we want is exactly the right way to find the optimal...
  19. Hi Brian, thats indeed strange. Thanks for...

    Hi Brian,

    thats indeed strange. Thanks for your measurement effort, thats not possible here at my work bench :-).

    As you said, one block of 128 samples is fed into the audio chain, and one...
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    @Blackaddr: could you point me in the right...

    @Blackaddr: could you point me in the right direction where I could add your register settings (in which file)?

    I tried to add them in my sketch in the setup, but no success, it seems to make no...
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    Very interesting! It would be nice to know where...

    Very interesting! It would be nice to know where and how exactly you changed the files (but maybe that will soon be incorporated in the next Teensyduino version?).

    I would just like to report my...
  22. You are probably right, I now soldered the T4 and...

    You are probably right, I now soldered the T4 and the audio board with very short wires and its still quite sensitive, I use a lower sample rate (and a lower MCLK freq) for the moment in order to be...
  23. Pete and FrankB, you saved my evening! :-) ...

    Pete and FrankB, you saved my evening! :-)

    Thanks a lot for the code, works fine for the Teensy audio board and T4!
  24. Hi Brian! yes, first I tried your convolution...

    Hi Brian!
    yes, first I tried your convolution object with the T4 and it worked nicely!

    The reason why I put up this sketch was:

    * it is Stereo
    * it divides the processor load evenly between...
  25. Fast Convolution Filtering with Teensy 4.0 and audio board

    To test T4 performance I extracted the fast convolution filtering code from my SDR and tested it with the Teensy 4.0 and the Teensy audio board. Both were connected with flying wires (MCLK with...
  26. Hi! it seems it does not work properly with...

    Hi!

    it seems it does not work properly with the library as it is at the moment.

    I used the SGTL5000 audio board, connected it to the T4.0 and used the guitar example. Additionally to the...
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    Thanks for your input! When using the DAC...

    Thanks for your input!

    When using the DAC alone, it works perfectly both ways: either with SCL connected to GND (PLL mode) or SCL connected to pin 23 (using MCLK from the Teensy 4.0).

    But when...
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    Oh, did not know that. I left SCL of the DAC...

    Oh, did not know that. I left SCL of the DAC unconnected.

    When testing with the Convolution object by DerekR I experienced strange crackling noises. Could it be that this is caused by this?

    I...
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    Thanks again for the hints! ADC works together...

    Thanks again for the hints! ADC works together with DAC !

    Connections for documentation:

    Teensy 4.0 with ADC PCM1808 module (line-in Input), running simultaneously with the DAC PCM5102...
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    Thanks for that hint! Is working now. Just for...

    Thanks for that hint! Is working now. Just for documentation for others to try:

    Teensy 4.0 and DAC PCM5102 module from AliExpress

    Vcc = Vin
    GND = GND
    FLT = GND
    SCL = floating
    BCK = BCK =...
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    Could you post your sketch for using the PCM5102...

    Could you post your sketch for using the PCM5102 with the Teensy 4.0? Or did you just use an example sketch? If yes, would be nice to know which one you used.

    Thanks a lot!

    Regards, Frank DD4WH
  32. Thread: Bat detector

    by DD4WH
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    Hi Edwin, thanks a lot! I will think more...

    Hi Edwin,

    thanks a lot! I will think more about that!

    However, adding additional hardware for features already implemented (built-in SD card) is a bit annyoing, and I think I read that the...
  33. Thread: Bat detector

    by DD4WH
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    well, then we will never know or solve the...

    well, then we will never know or solve the problem with the noise that you have . . .
  34. Thread: Bat detector

    by DD4WH
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    Hi Corbee, it could well be that the 23kHz...

    Hi Corbee,

    it could well be that the 23kHz noise is associated with the wrong connection of the central pad which must be left totally unconnected in single ended mode. But we do not know if you...
  35. Thread: Bat detector

    by DD4WH
    Replies
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    34,296

    Hi Corbee, as I stated, the spectrum is from...

    Hi Corbee,

    as I stated, the spectrum is from 0 to 250kHz (500ksps sample rate !), you have to multiply the frequency axis by 10 ;-).

    Your spectrum looks good, except for the peak at 23kHz.
    ...
  36. Thread: Bat detector

    by DD4WH
    Replies
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    strange, I updated the spectrum, can you see it...

    strange, I updated the spectrum, can you see it now? Its visible here . . .
  37. Thread: Bat detector

    by DD4WH
    Replies
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    Here is a spectrum of a recording with the...

    Here is a spectrum of a recording with the ICS40730 made in Audacity:

    17222

    As you can see, the scale is from -70 to -90dB on the y-axis, so there is no pronounced noise at a certain frequency,...
  38. Thread: Bat detector

    by DD4WH
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    34,296

    Hi Edwin, sorry for being silent so long. I...

    Hi Edwin,

    sorry for being silent so long. I have some experience with the ICS40730 and can only say its the most powerful ultrasound MEMS I have ever seen . . . it can pick up ultrasound up to...
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    Hi Valeri, well thats explainable: * there...

    Hi Valeri,

    well thats explainable:

    * there are different options to use the oscillator chip Si5351: which clock output do you use? [CLK0, CLK1, CLK2] and which Xtal frequency did you install?...
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    Hi FrankB, thanks a lot for your simulations...

    Hi FrankB,

    thanks a lot for your simulations of the input filter!

    I am a little puzzled about that difference in comparison to my simulations with ELSIE . . .

    Will have to think about that...
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    It will probably take us a while to account for...

    It will probably take us a while to account for the changes in Teensy 4.0.

    At the moment I am not sure whether it will compile and/or work with the T4. I do not own a T4 yet, but the order is...
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    There have been several people with that plan....

    There have been several people with that plan. But as far as I know, nobody has published code for that.

    If you are interested in an SDR transceiver code, you might have a look at UHSDR (however,...
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    you seem to confuse the "Teensy SDR" with the...

    you seem to confuse the "Teensy SDR" with the "Teensy Convolution SDR".

    The former is using all 16-bit integer math and uses blocks as in the audio library. So your proposed way of using it should...
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    As far as I can see, there is no need for such a...

    As far as I can see, there is no need for such a large (and processor-intense) FFT. Of course the T4 could help you, but I am pretty sure that by reducing the load you can do that on a T3.6

    Your...
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    Hi gohlhausen, thanks for your work! Did...

    Hi gohlhausen,

    thanks for your work!

    Did you test, how your FFT performs if applied to audio? In my experience, when used for convolution (FFT --> complex-multiply with filter mask --> inverse...
  46. We now use a total of 12 microSoundRecorders for...

    We now use a total of 12 microSoundRecorders for recording nocturnal Crex crex (corn crake). Thank you again, Walter, for providing us with this Teensy 3.6 recording tool with your software!

    Our...
  47. Thread: Bat detector

    by DD4WH
    Replies
    469
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    34,296

    deleted due to browser error.

    deleted due to browser error.
  48. Thread: Bat detector

    by DD4WH
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    Hi Edwin, what an impressive amount of...

    Hi Edwin,

    what an impressive amount of microphones!!! Looks like a lot of soldering fun ;-).



    This is wrong for single ended mode and is not stated in the datasheet, that is what my posts in...
  49. Thread: Bat detector

    by DD4WH
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    Hi Edwin, I feel that there are several people...

    Hi Edwin,

    I feel that there are several people having problems to understand how to use the ICS40730 in single ended mode for maximum performance ;-).

    Here is the <magic> with that MIC:

    GND...
  50. Thread: Bat detector

    by DD4WH
    Replies
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    I initially thought you were looking for people...

    I initially thought you were looking for people reporting about their experience with the ICS40730. Thats what I did.



    I can highly recommend the ICS40730 which has proved to be of excellent ...
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