Page 5 of 6
Posted: Tue Feb 13, 2007 12:52 pm
by ZooTooK
LeoDaV wrote: As for rise and fall of RMI there is some info
here.
J.
I've found
this in the SOS archives!
Gordon Reid rocks!
Posted: Tue Feb 13, 2007 1:17 pm
by ZooTooK
LeoDaV wrote:
On 16 May 1975 RMI released a note to their dealers on how to mod the RMI HS for external sequencer control. The input responds to +3V pules. Each pulse will increase the sequencer one step forward.
I think JMJ had this mod
J.
Thanks again Johan for sharing your knowledge!
Would you also happen to know how the digital oscillator work, in terms of sample frequency? I assume that they didn't work with fixed frequency (as modern equipment do) but rather using variable sample frequency, just as the Fairlight did. But doing the math they need a max sample frequency of 56kHz which seem to be a bit extreem at the time....
There is clearly some aliasing on the RMI sound effect on Rendez-Vouz 3....
Posted: Sat Feb 17, 2007 5:36 pm
by LeoDaV
ZooTooK wrote:Thanks again Johan for sharing your knowledge!
Would you also happen to know how the digital oscillator work, in terms of sample frequency? I assume that they didn't work with fixed frequency (as modern equipment do) but rather using variable sample frequency, just as the Fairlight did. But doing the math they need a max sample frequency of 56kHz which seem to be a bit extreem at the time....
There is clearly some aliasing on the RMI sound effect on Rendez-Vouz 3....
The RMI is monophonic with one master oscillator per 'side'. The frequency varies with the corresponding pitch for a note. Mind you the RMI is *NOT* a sampler
it has 2 DCO's.
J.
Posted: Sun Feb 18, 2007 10:54 am
by GeeJee
Additive synthesis, roight?
Posted: Sun Feb 18, 2007 1:39 pm
by LeoDaV
GeeJee wrote:Additive synthesis, roight?
Yes.
J.
Posted: Sun Feb 18, 2007 4:02 pm
by GeeJee
Obviously. And I knew the answer.
Still, I don't think it was not mentioned in this thread before...
That's why
Posted: Sun Feb 18, 2007 11:19 pm
by ZooTooK
LeoDaV wrote:ZooTooK wrote:Thanks again Johan for sharing your knowledge!
Would you also happen to know how the digital oscillator work, in terms of sample frequency? I assume that they didn't work with fixed frequency (as modern equipment do) but rather using variable sample frequency, just as the Fairlight did. But doing the math they need a max sample frequency of 56kHz which seem to be a bit extreem at the time....
There is clearly some aliasing on the RMI sound effect on Rendez-Vouz 3....
The RMI is monophonic with one master oscillator per 'side'. The frequency varies with the corresponding pitch for a note. Mind you the RMI is *NOT* a sampler
it has 2 DCO's.
J.
Aha, DCO you say - so there's no DACs. Just plain analog oscillators (16 per side) but controlled by the master clock (that is digital...)?
Posted: Sun Feb 18, 2007 11:52 pm
by GeeJee
No, digital oscillators. There's additive synthesis under the bonnet...
Don't confuse that with the commonly found subtractive synthesis...
Posted: Mon Feb 19, 2007 7:50 am
by Analog-Umph
GeeJee wrote:No, digital oscillators. There's additive synthesis under the bonnet...
Don't confuse that with the commonly found subtractive synthesis...
What's in the boot?
Posted: Mon Feb 19, 2007 6:57 pm
by GeeJee
Boot? What boot?
Posted: Fri Feb 29, 2008 4:03 pm
by Analog-Umph
GeeJee wrote:Boot? What boot?
Damn missed this one
You know, you have bonnet and then boot.
Posted: Fri Feb 29, 2008 4:08 pm
by radek tymecki
are there any schematics for rmi harmonic?
Posted: Fri Feb 29, 2008 5:36 pm
by Analog-Umph
Well since our only source of RMI knowledge, Johan, departed some time ago, I'd say no.
What are you thinking Radek, screw the analog synth, I'm gonna put together a RMI HS clone.
Posted: Fri Feb 29, 2008 5:50 pm
by Nico_Noyau
Would be damn interested in getting the schematics of the filter
Oh, I have to look for it, I'm off
Posted: Mon Mar 10, 2008 10:18 am
by Analog-Umph