Author |
Message |
Falk
Joined: Mar 07, 2006 Posts: 75 Location: Sweden
G2 patch files: 29
|
Posted: Thu May 03, 2007 3:29 am Post subject:
|
|
|
Thanks Chet!
Sadly, it only syncs correctly down to 83 Hz (wich works fine for a B3 with foldback (or rather foldup) on the 16' drawbar).
Another drawback is that the attack of a note will always start with all oscillators starting their cycle. Hopefully key click will cover that. But wait, if I implement phase locking correctly there will be three syncing events and that will randomize the phases a bit for the attack at the cost of a longer latency from keydown to sound, hmmm....
Now if I could only understand what and where the complex tone wheels were employed and how they sounded. A phase coherent B3 will pass the 50% mark even without your stepped drawbars so I might as well go for the whole enchilada.
/Falk |
|
Back to top
|
|
|
mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
|
Posted: Thu May 03, 2007 7:40 am Post subject:
|
|
|
On suggestion of Falk, I moved this to the General Discussion forum. _________________ --Howard
my music and other stuff |
|
Back to top
|
|
|
Falk
Joined: Mar 07, 2006 Posts: 75 Location: Sweden
G2 patch files: 29
|
Posted: Thu May 03, 2007 12:36 pm Post subject:
Fails to hold coherency in the long run..... |
|
|
Hello again.
Sadly the drift between the LFO's and the oscillators are large enough that it causes phasing in a 5-10 second time span in the upper range of the keyboard
Bummer.....
/Falk |
|
Back to top
|
|
|
Falk
Joined: Mar 07, 2006 Posts: 75 Location: Sweden
G2 patch files: 29
|
|
Back to top
|
|
|
Falk
Joined: Mar 07, 2006 Posts: 75 Location: Sweden
G2 patch files: 29
|
Posted: Sat May 05, 2007 8:29 am Post subject:
|
|
|
It looks like it is impossible to get a phase coherent Hammond on the G2. If you play the supplied patch it starts to twitter once you get high enough on the keyboard. And that is from just a 2 octave difference in pitch between the oscillator and the sync.
I think it is an aliasing artifact from the 96 kHz clock but why it should manifest itself in this manner is beyond me.
I hope I am worng and that someone can devise a better way.
/Falk
Description: |
|
Filesize: |
13.8 KB |
Viewed: |
28383 Time(s) |
|
Description: |
Oscillator sync gone wrong |
|
Download |
Filename: |
PhaseTest2.pch2 |
Filesize: |
1005 Bytes |
Downloaded: |
1373 Time(s) |
|
|
Back to top
|
|
|
mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
|
|
Back to top
|
|
|
Falk
Joined: Mar 07, 2006 Posts: 75 Location: Sweden
G2 patch files: 29
|
Posted: Sun May 06, 2007 9:05 am Post subject:
|
|
|
Sorry Mosc, not really.
A# is especially bad, even just below middle C and audible one octave below that.
I guess the whole idea is flawed. Thanks for the suggestion though.
What I don't understand is how the syncing can give glitches of such low frequency. Every other cycle of the audio producing oscillator is synced and if the difference is small enough to only produce syncing noise at that low frequency, how can the noise be so loud?
/Falk |
|
Back to top
|
|
|
blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
|
Posted: Sun May 06, 2007 9:23 am Post subject:
|
|
|
Would this give some insight ?
It's a bit over my head I'm affraid _________________ Jan
also .. could someone please turn down the thermostat a bit.
|
|
Back to top
|
|
|
Falk
Joined: Mar 07, 2006 Posts: 75 Location: Sweden
G2 patch files: 29
|
Posted: Sun May 06, 2007 11:11 am Post subject:
|
|
|
Thanks Blue.
It might tell the story (my math is not all that hot either). Interesting paper though.
"Hard-synced sine, finally, has no Cn continuity. This approach
cannot synthesize it exactly, but only approximate it;
aliasing will fall off by 6dB/oct per derivative whose discontinuity
is made bandlimited."
The quote seems to give hope. Otherwise the paper mainly deals with hard synced saw and square wave.
/Falk
PS. Another approach wich would only work in this case (the Hammond phase coherency, that is) is to not sync on the sync signal but rather slowly (over several cycles) change the pitch so that it will be synced up after X number of cycles. I have no idea of how to achive that in th G2 DS. |
|
Back to top
|
|
|
blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
|
Posted: Sun May 06, 2007 11:23 am Post subject:
|
|
|
Falk wrote: |
PS. Another approach wich would only work in this case (the Hammond phase coherency, that is) is to not sync on the sync signal but rather slowly (over several cycles) change the pitch so that it will be synced up after X number of cycles. I have no idea of how to achive that in th G2 DS. |
Maybe with (a) phase comparator(s) and using PhaseMod oscillators. _________________ Jan
also .. could someone please turn down the thermostat a bit.
|
|
Back to top
|
|
|
Falk
Joined: Mar 07, 2006 Posts: 75 Location: Sweden
G2 patch files: 29
|
|
Back to top
|
|
|
mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
|
Posted: Mon May 07, 2007 10:57 am Post subject:
|
|
|
Wish I could help, but at this point I don't even understand the objective of sync in this case. _________________ --Howard
my music and other stuff |
|
Back to top
|
|
|
Falk
Joined: Mar 07, 2006 Posts: 75 Location: Sweden
G2 patch files: 29
|
|
Back to top
|
|
|
jamos
Joined: Jun 01, 2004 Posts: 514 Location: Eugene, Oregon, USA
Audio files: 4
G2 patch files: 41
|
|
Back to top
|
|
|
mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
|
Posted: Sun Apr 04, 2010 12:03 pm Post subject:
|
|
|
Falk: A belated thanks for the explanation.
Jamos: Nice tunes on your Myspace page. _________________ --Howard
my music and other stuff |
|
Back to top
|
|
|
G2egory
Joined: Nov 19, 2004 Posts: 69 Location: Charlottesville VA
Audio files: 3
G2 patch files: 2
|
Posted: Mon Apr 05, 2010 8:55 pm Post subject:
|
|
|
Hey Jamos,
The musical stuff you two Control freaks are doing is great!
I adore the energy. Keep it up! |
|
Back to top
|
|
|
jamos
Joined: Jun 01, 2004 Posts: 514 Location: Eugene, Oregon, USA
Audio files: 4
G2 patch files: 41
|
Posted: Tue Apr 06, 2010 7:35 pm Post subject:
|
|
|
Hey, thanks Mosc and G2eg!
This is a fun project.. not like anything I've done before. I didn't want to play in a duo but circumstances lead to it. I've been putting a huge amount of effort into sequencing with the G2 - everything that you hear that is not vocals or a blatantly obvious sample is G2 - so I am highly indebted to those who have created patches like Chet's B3. That thing f*cking ROCKS. |
|
Back to top
|
|
|
|