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Type: Posts; User: Avi Harel

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  1. Replies
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    Thanks Paul, I ended up using #11 code in this...

    Thanks Paul,
    I ended up using #11 code in this thread :

    https://forum.pjrc.com/threads/54058-Vader-voice-changer?highlight=dalek

    and I only tweaked the parameters (using a slightly high pitch...
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    Simulating Bill Cipher

    Dear all,
    I am trying to construct an emulation of Bill Cipher voice (from Gravity Falls)
    (this is for a costume for my 8 year old son)
    here is an explanation of how to create the voice effect in...
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    I updated to Teensyduino 1.43 and Arduino 1.8.6...

    I updated to Teensyduino 1.43 and Arduino 1.8.6
    and everything's working properly...Thanks to all !
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    Thanks for the quick reply Paul, Mine says :...

    Thanks for the quick reply Paul,

    Mine says : Version 1803 OS build 17134.285

    Teensyduino 1.38-beta2
    Arduino 1.8.2
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    Latest Windows 10 update issue

    Dear All,
    I have installed the latest Windows 10 update
    and now my teensy is not recognized !
    the led flickered once and then seemed to shut down completely...
    anyone else with this problem ?...
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    thanks...for some reason I saw it reversed,don't...

    thanks...for some reason I saw it reversed,don't know how I could have missed that...
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    Sorry if this is a trivial question, I will be...

    Sorry if this is a trivial question,
    I will be glad to any answer...
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    A Question about Peak

    Hey guys,
    I have a question about the Peak function from the audio library,
    I am attaching the code here for reference :

    This is analyse_peak.h :


    #ifndef analyze_peakdetect_h_
    #define...
  9. A problem using the Audio library and ADC library

    Hey guys,
    I am experiencing a strange problem using Pedvide's (great) ADC library and the audio library :
    I am trying to read a (10k linear) pot while reading an audio input through the adc,
    here...
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    ...then I still do not understand where is the...

    ...then I still do not understand where is the zero coming from :
    *buf here is an int16_t, it gets the value val>>15 and then we advance
    it by 2 which seems to imply that the next sample - (buf+1)...
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    Ok, I think I understand what the "endianness"...

    Ok, I think I understand what the "endianness" property means
    but I just want to make sure I understand the code correctly :
    in :


    static void apply_window_to_fft_buffer(void *buffer, const...
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    that makes sense, but shouldn't this be the other...

    that makes sense, but shouldn't this be the other way around ?
    It says here
    that the input to the fft should be :

    {real[0], imag[0], real[1], imag[1],..}

    so shouldn't the "bottom" value be...
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    Thanks, I see what I missed : In the code ...

    Thanks, I see what I missed : In the code


    static void copy_to_fft_buffer(void *destination, const void *source)
    {
    const uint16_t *src = (const uint16_t *)source;
    uint32_t *dst = (uint32_t...
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    FFT code question

    Dear All,
    I found an apparent contradiction in the analyze_fft1024.cpp code,
    I would be much obliged if anyone could resolve this :

    On the one hand in the function copy_to_fft_buffer, there's...
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    Thanks for the answers, the frequency is about 1...

    Thanks for the answers, the frequency is about 1 Mhz so I guess freqcount is better but luckily I do not need an audio input,
    but for general knowledge and for the benefit of those who may need it :...
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    Pin assignment on FreqCount

    Dear all,
    I am trying to use FreqCount library (on teensy 3.2) together with the audio shield.
    however the only pin available for use in FreqCount is pin 13 while this pin cannot be used
    while...
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    much obliged for the detailed answer !

    much obliged for the detailed answer !
  18. Replies
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    thanks for the reply, It was very helpful....

    thanks for the reply, It was very helpful.
    Indeed I now see that pins 0 through 8 work just fine,
    then which pins are "disallowed" as buttons when using the audio shield ?
    I did not see this...
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    problem with buttons and audio

    Dear All,
    I am encountering a strange problem with operating a button while using the audio adapter.
    I have one button with one end wired to ground and the other to pin 22
    I am using teensy 3.2...
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    ...Ok, found it : The problem was in...

    ...Ok, found it : The problem was in AudioMemory(20)
    I should have allocated more memory (around 100 seems fine)
    hope this helps someone in the same situation
  21. Replies
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    Help with delay effect

    Hi everyone,
    I am trying to create a simple delay effect on a signal
    however I am not getting a clean delay sound but rather
    some kind of white noise instead of the delay. Can anyone reproduce...
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    got it, thanks !

    got it, thanks !
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    Ok, thanks for the answer. I will try to...

    Ok, thanks for the answer. I will try to implement inverse FFT and publish it in the forum.
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    Thanks, this was helpful. I am browsing through...

    Thanks, this was helpful.
    I am browsing through : http://www.keil.com/pack/doc/CMSIS/DSP/html/index.html
    I see that there is indeed no preprogrammed function to compute LPC. I also saw that there...
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    Audio teensy gui help

    Dear All,
    Could someone please explain to me how can I edit the Audio Design GUI tool,
    In particular how can I add new objects ?
    sorry if this was asked before, I could not find it.
    Thanks
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    Cortex m4 dsp guidance

    Dear all,
    I would like to write some new objects for the audio library (I am using the audio adapter).
    I am trying to find a clear documentation of the available instructions
    in the "Cortex M4...
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    I would like to share the best I got so far. It...

    I would like to share the best I got so far. It does sound quite good and I think the only way to make it better
    is to construct better physical drum pads (a la yamaha digital drum kits). In any...
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    Ok, I will try that. Thanks for the help.

    Ok, I will try that. Thanks for the help.
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    but it is not just a trigger, I use the actual...

    but it is not just a trigger, I use the actual value of the peak to control the volume of the appropriate input to the mixer.
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    Thanks for your reply. I already did that - I am...

    Thanks for your reply. I already did that - I am using a (very simple) peak holder using LM324 which gives good results. Actually everything works great and the only problem is I cannot
    realize the...
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    Drum Module Help

    I am trying to build a (very basic) drum module using teensy (3.1) and the audio shield
    this is my setup :

    5681

    where each piezo is connected to on an analog pin mediated by the adc-s. However...
  32. Thread: Drum Trigger

    by Avi Harel
    Replies
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    Hey, I am actually not quite sure about that...

    Hey,
    I am actually not quite sure about that circuit, I did try it out but the values specified did not seem to work.
    I am also not clear about the lower circuit in the drawing (with the LMC7660),...
  33. Thread: Drum Trigger

    by Avi Harel
    Replies
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    Hey guys, I would like to report on my progress...

    Hey guys,
    I would like to report on my progress for the benefit of anyone else trying to
    conduct a similar project (or even just use a pressure sensitive sensor) :

    After some searching in the...
  34. Thread: Drum Trigger

    by Avi Harel
    Replies
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    Hey Guys, Thanks for your replies. I tried...

    Hey Guys,
    Thanks for your replies.
    I tried robsoles's suggestion and it did make the piezo somewhat less sensitive,
    I also tried DaveB's suggestion but I only added a 0.1uF capacitor, the other...
  35. Thread: Drum Trigger

    by Avi Harel
    Replies
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    4,110

    Drum Trigger

    Dear all,
    First let me say thanks to paul for this wonderful project.
    I honestly do not know if I would get so much into electronics
    (as a hobbyist) without this project.

    My aim this summer is...
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    improved example

    I have improved my example to include a "wet" and "dry" mix and
    I increased the number of LBCF to 16 as originally intended (8 for each channel)
    and also 2 AP filters.Some samples sound good but I...
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    Freeverb for teensy

    Dear all,
    I have written the two building blocks of the freeverb algorithm
    as defined in https://ccrma.stanford.edu/~jos/pasp/Freeverb.html
    (I basically edited Paul's biquad filter code, as Paul...
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    Developing new Audio objects

    Dear all,
    I would like to develop some new audio objects for the good of the community.
    my strong suit is math and (theoretical) computer science, I know how to program
    but I did not have a chance...
  39. Teensy 3.1 and Audio Adapter : Compilation problems

    I have recently installed the audio board to my Teensy 3.1.
    While some of the examples in Audio-Master Library work great, for example
    PlayFromSketch and PlayWavFromSdCard, I am experiencing a...
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