Cycfi Six Pack Project - Hexaphonic Pickup Project

Started by Elantric, May 24, 2013, 04:33:28 PM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

chrish

New direction for this company.

http://www.cycfi.com/2018/01/roadmap/

"Simplify! I think that will be my mantra for 2018."


imerkat

I honestly wished i could retro his pickup to a Variax. If he had an option to send in Variax in to have it professionally done he would see an amazing new revenue stream imo. But no proof of concept so...


chrish

From a guitar player perspective I'm finding it very useful to learn the mechanics of how false triggers occur in pitch to MIDI and even pitch to cv conversion schemes.

A lot of that information is presented here at vguitarforums and reading Joel's new approach solution  is very informative.


http://www.cycfi.com/2017/10/fast-and-efficient-pitch-detection/

"Multiple triggers are caused by overtones overpowering the fundamental frequency. These harmonics typically occur as local positive or negative peaks close to the intensity of the highest peak".

Elantric

#130
Quote from: chrish on February 20, 2018, 12:20:29 PM
From a guitar player perspective I'm finding it very useful to learn the mechanics of how false triggers occur in pitch to MIDI and even pitch to cv conversion schemes.

A lot of that information is presented here at vguitarforums and reading Joel's new approach solution  is very informative.


http://www.cycfi.com/2017/10/fast-and-efficient-pitch-detection/

"Multiple triggers are caused by overtones overpowering the fundamental frequency. These harmonics typically occur as local positive or negative peaks close to the intensity of the highest peak".

more info here from Andras Szalay

MIDI Guitar FAQ
http://www.panda-audio.com/midiguitar.php

admin


vanceg

They JUST released the new version of the NU Capsule...which are the  next generation of this technology.  The Multi sets of these new NU pickups will be out soon.... I don't know when, though. 

I happen to have one set of the Nu MUlti that I'm not using (I put them on two guitars, but I decided to not build the third for the moment).  Let me know if you'd like to buy them from me.

GuitarBuilder

The second generation Nu capsule looks very promising:

http://www.cycfi.com/projects/nu-series/nu-capsule-v2/

Flat response from 20-20kHz, rail-to-rail output using 5-18V supplies, 10k output impedance.
"There's no-one left alive, it must be a draw"  Peter Gabriel 1973

nix808

Quote from: chrish on February 20, 2018, 12:20:29 PM
From a guitar player perspective I'm finding it very useful to learn the mechanics of how false triggers occur in pitch to MIDI and even pitch to cv conversion schemes.

Hi Chris 8D
I can maybe help a little.
The guitar signal is ac, so raw, the amplitude(if set to gate on a threshold) flutters on and off.
We can mitigate this with an envelope follower of some sort.
Peak is pretty easy to take, but I'm finding RMS(root mean square) is the best simple amplitude following device.
I find it is necessary to filter it too though. So I take RMS and then smooth it.
If you smooth too much, new notes will not trigger, if not smoothed enough,
there are false triggers. This is pretty much what happens I think, digitally speaking.
The RMS window seems best at around 50ms. This also affects this balance which is made by the device builder,
or made available to the user to custom to their liking.
Hope helps-Nick
Rock and Rock my boat, as long as you don't rock and rock my boat!hehe

vanceg

Quote from: vanceg on June 04, 2018, 10:55:37 AM
They JUST released the new version of the NU Capsule...which are the  next generation of this technology.  The Multi sets of these new NU pickups will be out soon.... I don't know when, though. 

I happen to have one set of the Nu MUlti that I'm not using (I put them on two guitars, but I decided to not build the third for the moment).  Let me know if you'd like to buy them from me.

Seriously   Perhaps I should make this NU set available for someone else.... I'll use it eventually, but it's a perfectly great set of pickups and I have no plans for using them in the next 6-8 months.... I'll post it on the for sale section when I can.  If one of you all who are following this thread want them, I'm happy to sell them at a reasonable price. I belive I even have the 13 pin output system and board (one of the few that were actually made: The designs exist, of course, and you can build them yourself if you want...as is true with all Cycfi gear since it's open source)

imerkat


imerkat

Quote from: vanceg on June 04, 2018, 01:44:48 PM
Seriously   Perhaps I should make this NU set available for someone else.... I'll use it eventually, but it's a perfectly great set of pickups and I have no plans for using them in the next 6-8 months.... If one of you all who are following this thread want them, I'm happy to sell them at a reasonable price.

Do you still have it? what iteration to you have exactly? I'm interested btw

vanceg

I do.  Check your PM I'll hit you up there.

GuitarBuilder

Update:

If you have not already, check out the v2 Nu and Nexus products on the Cycfi Research site:

https://www.cycfi.com/projects/nu-series-v2/

https://www.cycfi.com/projects/nexus-v2/

Both designs incorporate a number of great improvements, some of which were the result of comments in this thread!
"There's no-one left alive, it must be a draw"  Peter Gabriel 1973


GuitarBuilder

Quote from: admin on June 10, 2020, 11:38:24 AM
https://www.cycfi.com/2015/11/computational-hexaphonic-guitar/



Interesting research project!  Note they used FFT for pitch detection which does tend to have issues.  It reminds me of the Antares Autotune for Guitar product, which preceded this project and created the same end result (only better) with a similar pitch-shifting algorithm.  ATG used a brilliant auto-correlation approach for pitch detection that had incredibly low latency.  It was an amazing product!
"There's no-one left alive, it must be a draw"  Peter Gabriel 1973

nix808

I see I have misunderstood here with the false triggers-
my prior post was talking about note on and off gate,
not the pitch figure.

So yeah- the form has a very strong harmonic,
which plays merry hell really

When you record the audio from a GK3, you can plainly see the harmonic dancing around after the fundamental
Rock and Rock my boat, as long as you don't rock and rock my boat!hehe

Elantric