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  1. You are probably right . . . I remember fiddling...

    You are probably right . . . I remember fiddling around a lot about this when I wrote the code . . . I need to have a look into my handwritten archive for the initial preparations/thoughts on that.
    ...
  2. I think, I have to correct myself (although I am...

    I think, I have to correct myself (although I am not so sure, do not have the time at the moment to test this or properly think about it):

    * the code as it is, does in fact offer the possibility...
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    Maybe we should open a separate thread with this...

    Maybe we should open a separate thread with this phenomenon?

    * Windows 10, Arduino 1.8.13 TD 1.53
    * Teensy 4.0 with Teensy audio shield REV D
    * USB - Audio in / I2S Audio out
    * Compiling with...
  4. Inside the Convolution loop, we are doing a...

    Inside the Convolution loop, we are doing a complex FFT / inverse FFT routine. The real part of the input is one channel, the imaginary part of the input is the other channel. So in one loop, BOTH...
  5. good that it works for you now! Very...

    good that it works for you now!

    Very interesting!

    Would you be willing to prepare a very short How-To for your room correction for speakers somewhere?


    EDIT: Strangely, USB audio seems to...
  6. Tested the USB_Passthrough example with Teensy...

    Tested the USB_Passthrough example with Teensy 4.0 & Audio board Rev D, Arduino 1.8.13 TD 1.53, but I cannot get it to work.

    * Compiled the sketch with USB type: Audio
    * compiled fine
    * PC...
  7. Hmm, strange. I have never used USB audio with...

    Hmm, strange.

    I have never used USB audio with the Teensy and have no hardware compatible with SPDIF, so I cannot test that.

    One idea is the sample rate: why did you comment out the I2S setting...
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    Not sure if I understand what the problem is. I...

    Not sure if I understand what the problem is. I use Teensy audio lib in many projects only as a queue in - queue out helper.

    Maybe you would like to have a look at an example which works:
    ...
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    Very good to hear! Have fun with your SDR!

    Very good to hear! Have fun with your SDR!
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    Perfectly OK :-). Its just that I cannot help...

    Perfectly OK :-).
    Its just that I cannot help you with the Msi001 version of the Teensy Convolution SDR!
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    No, it seems you completely misunderstood me!...

    No, it seems you completely misunderstood me! There is NO roadmap, not even a hidden one.

    And there already is existing code for the Msi001 which allows for the VHF/UHF bands you are looking for...
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    Iņigo, it is already possible with the Msi001...

    Iņigo,
    it is already possible with the Msi001 chip! Ask tisho and Esteban! I do not have working hardware with the Msi001, so I cannot contribute to that part of the software (yet).
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    Henk, try to uncomment: #define USE_W7PUA

    Henk, try to uncomment:
    #define USE_W7PUA
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    Yes! But it is defined in different ways,...

    Yes! But it is defined in different ways, depending on which hardware you have defined at the beginning of your sketch!

    Which Hardware did you define in the very first lines of the sketch?
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    Hi Henk, you have to keep an eye on which...

    Hi Henk,

    you have to keep an eye on which #define you uncomment/comment at the beginning of the .ino-file.

    Probably you have too many #define uncommented, so that the program initializes a very...
  16. Very easy: buy a Teensy 4.1 (SD card slot) with a...

    Very easy: buy a Teensy 4.1 (SD card slot) with a Teensy audio board and use the LINE IN. The audio from the LINE IN is sampled by the codec and no effect is added.
  17. Hi Dirk, when I changed the code to work with...

    Hi Dirk,

    when I changed the code to work with T4.1, I also used two PSRAM chips and checked whether that would work.

    it does not work!

    The reason is not the CPU power, which the T4 has more...
  18. :-) Well, it is a matter of definition of your...

    :-)
    Well, it is a matter of definition of your goals!

    You mention three different of your goals in this thread:

    * pitch shifting
    * playback rate adjustment
    * crunchy and lovely audio...
  19. In the context of Software Defined Radio dealing...

    In the context of Software Defined Radio dealing with analytical (complex) signals, builders often use an IF at exactly samplerate-divided-by-4, ie. in your case 192ksps / 4 = 48kHz

    Then you are...
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    I am not at all familiar with FAUST, but by...

    I am not at all familiar with FAUST, but by looking at the webpage it seems that there are things that can be very easily done with a T4.1 (all the filtering stuff) and more complex/demanding things...
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    Could you specify your project and the kind of...

    Could you specify your project and the kind of DSP you are planning? Otherwise there is no chance anyone could help you with an idea.
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    ??? Could you be a little more specific in your...

    ??? Could you be a little more specific in your question?

    I think the T4.1 is more than capable of doing complex DSP.
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    Bob Larkin provided very nice code for an Audio...

    Bob Larkin provided very nice code for an Audio Equalizer (https://forum.pjrc.com/threads/60928-Audio-Equalizer-using-FIR?highlight=audio+equalizer), which I implemented as a 9-band graphical EQ in...
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    Yes, the Malahit is a nice receiver, but...

    Yes, the Malahit is a nice receiver, but unfortunately closed source.

    If you port the software to the STM32F7 or H7, please keep it open source and it would be very nice if you posted a link to...
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    Yes. At the moment it is programmed like that....

    Yes. At the moment it is programmed like that. Synch is not a problem, because both, the ADC and the DAC use the same master clock MCLK provided by the Teensy.

    Paul, did you already build a Teensy...
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    Not sure what you mean exactly? What are "valid...

    Not sure what you mean exactly? What are "valid channels"?

    Do you want an automatic frequency scan search for stations and save their frequencies in memory?

    That is not implemented at the...
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    I hope, the new version solves this problem. ...

    I hope, the new version solves this problem.

    73 Frank
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    Thanks for pointing me to that, You are right, I...

    Thanks for pointing me to that, You are right, I built that bug. Will try to solve that this evening.
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    Bill, I tried to exactly reproduce the situation...

    Bill, I tried to exactly reproduce the situation you described:

    * 50 Ohms resistor on the antenna input

    21537

    So, the spectrum looks similar, BUT: the birdies are very very low signal...
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    Yes, fully agreed! :-) AM mediumwave stations...

    Yes, fully agreed! :-)

    AM mediumwave stations do not pose problems any more here in Central Europe, because most countries have shut down all or many of their transmitters! (eg. Germany, the...
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    Just to let you know I uploaded a new version of...

    Just to let you know I uploaded a new version of the software to my github.

    * Teensy 4.1 support with DO7JBH hardware (and a self-built T4.1 to T3.6 adapter)
    * Menu Assistant by tisho (thanks a...
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    for wideband transformers, I have good experience...

    for wideband transformers, I have good experience with FT77 ferrite material ring cores and also with binocular cores 73-202. Using this ferrite material leads to better results in the VLF range...
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    Hi Bill, good to hear your setup works with...

    Hi Bill,

    good to hear your setup works with higher drive strength. I use the default 2mA and it works, but could have to do with shorter wires.

    You made a very good point in discussing the...
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    Hi! that looks like you have some sophisticated...

    Hi!
    that looks like you have some sophisticated plans, very interesting!

    Si5351:
    * maybe you could experiment with the drive strength of the Si5351 which is software controlled?...
  35. Workaround1: * Restart the Codec once you...

    Workaround1:
    * Restart the Codec once you detected twinpeaks
    Workaround2:
    * Shift your Sample Buffer by one Sample once detected

    I use the DAC PCM5102 for my setup
    You do Not need two Teensy...
  36. This specific bug made me crazy a few years ago...

    This specific bug made me crazy a few years ago while programming SDR radio software.

    We termed it "twin peak syndrome", because in an SDR, you have to have a strict 90 degree phase difference in...
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    It seems I had a combined hardware and a software...

    It seems I had a combined hardware and a software bug that prevented mirror rejection. Now it runs and the mirror rejection seems normal! Excellent.

    Also, the mirror rejection seems to be highly...
  38. Thread: Bat detector

    by DD4WH
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    Deleted due to possible misunderstanding

    Deleted due to possible misunderstanding
  39. Thread: Bat detector

    by DD4WH
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    Yes, exactly. An ultrasound signal ZoomFFT...

    Yes, exactly.

    An ultrasound signal ZoomFFT example with real figures:



    with the original routine in the software, 256 samples are taken as input for the FFT [the internal routine uses an...
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    Regarding the non-existing mirror rejection with...

    Regarding the non-existing mirror rejection with the Msi001:

    * Do you experience also missing mirror rejection?
    * in your video, Esteban, I can see that there is some mirror rejection on...
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    @tisho, @Esteban: I have a bugfix for the...

    @tisho, @Esteban:

    I have a bugfix for the tuning step / AFC


    int64_t DeltaF = p.freq - Flo; //Calculate the diference between the "set" and the "result"(without fine correction)...
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    0xf380 does not make sense to me at all:...

    0xf380 does not make sense to me at all:
    1111001110000000 --> so reg0, no RF synthesizer enabled??? [bit 10]

    and then, reg0 is written again?
    0x6280
    --> 110001010000000

    and then, which...
  43. Thread: Bat detector

    by DD4WH
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    Ivano, * is there a similar ADC with 500ksps...

    Ivano,

    * is there a similar ADC with 500ksps that could be powered on a single 3V3 supply? That would enable users to power them with a single 3V7 lithium 18650 cell. The ADS8685 seems to be using...
  44. Thread: Bat detector

    by DD4WH
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    Hi Ivano, just a comment on the codec: *...

    Hi Ivano,

    just a comment on the codec:

    * the first version of the Bat detector of this thread (four years ago ;-)) had a codec because I had a Teensy audio board at hand and it was easier to...
  45. Thread: Bat detector

    by DD4WH
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    Hi Edwin, thanks for your correction! That was...

    Hi Edwin,

    thanks for your correction! That was my fault, I altered my post accordingly!

    Yes, you are right, depending on the gain of the preamp, you will get a lot of noise anyway and the...
  46. Thread: Bat detector

    by DD4WH
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    Hi, it is really fantastic to follow the...

    Hi,

    it is really fantastic to follow the developments by you, Cor & Edwin. This is a superb project!

    Just my subjective view on the question which microphone to use [my experience from the last...
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    @Esteban, @tisho Thanks again, to you, Esteban...

    @Esteban, @tisho
    Thanks again, to you, Esteban and your colleague EA7GIB for your kindness to send me a Msi001 board for integration into the Convolution SDR software!
    I am working hard to get it...
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    Thanks a Lot! Will Take a Look in August, sorry,...

    Thanks a Lot! Will Take a Look in August, sorry, that its Not possible earlier!
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    Fantastic developments! I am really impressed!...

    Fantastic developments! I am really impressed!
    @tisho: the menu looks excellent! I would really like to include it into the main code. Is it possible that you submit a pull request to my github? it...
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    Bill, exactly, you got it, excellent! Some...

    Bill, exactly, you got it, excellent!

    Some further comments on the signal flow:

    * I & Q samples coming in with user-defined sample rate (as an example, lets take 96ksps)
    * spectrum display...
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