Guitar string processor?

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Comments

  • I've always wanted to mess with pitch to midi but never got around to it. I have a Roland GR-50 guitar synth that uses a GK2 hexiphonic pickup and 13 pin connector. The GKx hexiphonic pickups aren't too expensive... I've considered picking up a broken GR-50 or similar for parts...
    Just a thought!
  • RichardB wrote: »
    Mickster wrote: »

    On the pickup subject... I would point out that Chip's 'Fun with Goertzel' looks like it runs at a 1 khz sample rate, and that appears to be randomly chosen. I have done no math on this, and it is still half-baked.. but the sample rate can probably run MUCH faster... The strings are metal, why not try to do a pickup that can be etched on a PC board? Maybe even end up with something superior... You would only need 1/2 of the demo per string.
    Hehehe, this idea made me giggle like a little girl. :lol: The sampling rate can certainly run much faster. Hopefully the signal to noise ratio will be good enough. There's a lot that can be done with signal processing. I don't know how linear the physics of a capacitive pickup would be, or if it matters. But a superior pickup that can be easily installed on any stringed instrument? Hehehe.

    Welcome to the forum!
  • cheezus wrote: »
    I've always wanted to mess with pitch to midi but never got around to it. I have a Roland GR-50 guitar synth that uses a GK2 hexiphonic pickup and 13 pin connector. The GKx hexiphonic pickups aren't too expensive... I've considered picking up a broken GR-50 or similar for parts...
    Just a thought!

    Ah, of course, why didn't I think of the GK2! It appears that there is now the GK3.
  • But a superior pickup that can be easily installed on any stringed instrument? Hehehe.

    Bingo!
  • P2 system:

    Auto-tune

    Alternate tuning

    Emulation of other guitars including acoustics, 12-string, Sitar, Banjo, Dobro.

    Pitch-to-MIDI

    Open source

    This would be a huge crowd-funding success.
  • The fretboard could also be a controller for a backing-track MP3 player. Nominate one or two random notes that would be silent, to perform a control function. Right now we have to tap-dance on start/stop switches.
  • RichardB wrote: »
    Mickster wrote: »

    On the pickup subject... I would point out that Chip's 'Fun with Goertzel' looks like it runs at a 1 khz sample rate, and that appears to be randomly chosen. I have done no math on this, and it is still half-baked.. but the sample rate can probably run MUCH faster... The strings are metal, why not try to do a pickup that can be etched on a PC board? Maybe even end up with something superior... You would only need 1/2 of the demo per string.
    Hehehe, this idea made me giggle like a little girl. :lol: The sampling rate can certainly run much faster. Hopefully the signal to noise ratio will be good enough. There's a lot that can be done with signal processing. I don't know how linear the physics of a capacitive pickup would be, or if it matters. But a superior pickup that can be easily installed on any stringed instrument? Hehehe.

    Welcome to the forum!

    Thanks for the welcome. Everyone!

    Hmmm, I just can't put this half-baked idea down. I'm thinking fairly wide electrodes between the strings, alternating 0 and 90 degrees carrier phase, A longish aspect ratio for good coupling. Then the 'Pickup' electrodes offset along the length, so they can also be wide.

    This should be tolerant to noise because we are only interested in the resultant angle.. Or.. Now I wonder what effects may be possible also looking at the magnitude, maybe mixing. It would all be there, and take few or no additional components..
  • RichardB wrote: »
    RichardB wrote: »
    Mickster wrote: »

    On the pickup subject... I would point out that Chip's 'Fun with Goertzel' looks like it runs at a 1 khz sample rate, and that appears to be randomly chosen. I have done no math on this, and it is still half-baked.. but the sample rate can probably run MUCH faster... The strings are metal, why not try to do a pickup that can be etched on a PC board? Maybe even end up with something superior... You would only need 1/2 of the demo per string.
    Hehehe, this idea made me giggle like a little girl. :lol: The sampling rate can certainly run much faster. Hopefully the signal to noise ratio will be good enough. There's a lot that can be done with signal processing. I don't know how linear the physics of a capacitive pickup would be, or if it matters. But a superior pickup that can be easily installed on any stringed instrument? Hehehe.

    Welcome to the forum!

    Thanks for the welcome. Everyone!

    Hmmm, I just can't put this half-baked idea down. I'm thinking fairly wide electrodes between the strings, alternating 0 and 90 degrees carrier phase, A longish aspect ratio for good coupling. Then the 'Pickup' electrodes offset along the length, so they can also be wide.

    This should be tolerant to noise because we are only interested in the resultant angle.. Or.. Now I wonder what effects may be possible also looking at the magnitude, maybe mixing. It would all be there, and take few or no additional components..

    Welome!
    Sounds like we have an educated person involved with this endeavor. :)
  • Publison wrote: »
    RichardB wrote: »
    RichardB wrote: »
    Mickster wrote: »

    On the pickup subject... I would point out that Chip's 'Fun with Goertzel' looks like it runs at a 1 khz sample rate, and that appears to be randomly chosen. I have done no math on this, and it is still half-baked.. but the sample rate can probably run MUCH faster... The strings are metal, why not try to do a pickup that can be etched on a PC board? Maybe even end up with something superior... You would only need 1/2 of the demo per string.
    Hehehe, this idea made me giggle like a little girl. :lol: The sampling rate can certainly run much faster. Hopefully the signal to noise ratio will be good enough. There's a lot that can be done with signal processing. I don't know how linear the physics of a capacitive pickup would be, or if it matters. But a superior pickup that can be easily installed on any stringed instrument? Hehehe.

    Welcome to the forum!

    Thanks for the welcome. Everyone!

    Hmmm, I just can't put this half-baked idea down. I'm thinking fairly wide electrodes between the strings, alternating 0 and 90 degrees carrier phase, A longish aspect ratio for good coupling. Then the 'Pickup' electrodes offset along the length, so they can also be wide.

    This should be tolerant to noise because we are only interested in the resultant angle.. Or.. Now I wonder what effects may be possible also looking at the magnitude, maybe mixing. It would all be there, and take few or no additional components..

    Welome!
    Sounds like we have an educated person involved with this endeavor. :)

    Which is what I find amazing about this community. 👍
  • There's always a tension between lowering the barrier to entry - bringing in more people - and keeping the education level and quality of contribution high.
  • cgraceycgracey Posts: 13,079
    edited 2020-03-12 - 01:32:08
    AJL wrote: »
    There's always a tension between lowering the barrier to entry - bringing in more people - and keeping the education level and quality of contribution high.

    I barely made it out of high school with a 2.34 GPA. At the behest of my parents, I went to college and got a 0.95 GPA and was put on academic probation. So, I fell out the bottom and just focused on Parallax stuff. At one point, when we had about a dozen employees, my girlfriend (at the time) encouraged me to go back to school so I could get a REAL job. It just recently occurred to me, "Wait a minute... Those twelve people all thought THEY had real jobs."
  • AJLAJL Posts: 347
    edited 2020-03-12 - 03:17:39
    Ok, but I wasn't talking about formal education.

    My experience of the Arduino crowd is that there's a prevalence of 'I don't know much about electronics, but now I don't need to', whereas the Parallax crowd seems to be better educated, even if that is through self-education.
  • AJL wrote: »
    Ok, but I wasn't talking about formal education.

    My experience of the Arduino crowd is that there's a prevalence of 'I don't know much about electronics, but now I don't need to', whereas the Parallax crowd seems to be better educated, even if that is through self-education.

    Right on! We are living in a time when almost anything can be learned for free. Everybody can know as much as they want to know. Some people don't want to know much.
  • I never did college either, and I am also learning new things all the time. I've been teaching myself things since I was a child, and I'll continue until I can't (as in I'm dead).
    Anyone can learn anything these days, it's fantastic.
  • cgracey wrote: »

    Right on! We are living in a time when almost anything can be learned for free. Everybody can know as much as they want to know. Some people don't want to know much.

    Too true. I am mostly self-educated. It is probably true that I had a fool for a teacher!

    When I finally jumped through the hoops and got my degree, there was this fella in the classes who always had his earbuds in. He took the courses over and over until he 'passed'. In lab, he couldn't light an LED, yet eventually graduated with the same degree I earned...

    Knowledge is always what you make of it!
  • cgracey wrote: »
    ...high school with a 2.34 GPA... ...college and got a 0.95 GPA...
    Why?
  • The_Master wrote: »
    cgracey wrote: »
    ...high school with a 2.34 GPA... ...college and got a 0.95 GPA...
    Why?

    I liked learning, but I didn't like homework.
  • cgracey wrote: »
    The_Master wrote: »
    cgracey wrote: »
    ...high school with a 2.34 GPA... ...college and got a 0.95 GPA...
    Why?

    I liked learning, but I didn't like homework.

    +1, +1 :lol:
  • cgracey wrote: »
    AJL wrote: »
    Ok, but I wasn't talking about formal education.

    My experience of the Arduino crowd is that there's a prevalence of 'I don't know much about electronics, but now I don't need to', whereas the Parallax crowd seems to be better educated, even if that is through self-education.

    Right on! We are living in a time when almost anything can be learned for free. Everybody can know as much as they want to know. Some people don't want to know much.

    I find for many people it's not a lack of desire to know a lot, but a case of not wanting to put in the time and effort to acquire the knowledge. For those who want to learn and are willing to put in the time and effort we are living in a golden age where we can learn every day.

  • cgracey wrote: »
    The_Master wrote: »
    cgracey wrote: »
    ...high school with a 2.34 GPA... ...college and got a 0.95 GPA...
    Why?

    I liked learning, but I didn't like homework.

    That and chasing you-know-what....😁😁😁👍
  • I have a theory that GPA somewhat correlates with intelligence (obviously), but that there is an actual inversion that occurs at a certain point. These people with 3.95 GPA's etc, there is an actual mental illness at work when you consider what it takes to achieve it.

  • you can find used versions of this type of hex pickup around:

    https://www.roland.com/global/products/gk-3/

    A few more ideas

    ElektroCaster
    An open, modular guitar-design with some nifty features.

    https://hackaday.io/project/161675-elektrocaster
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