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RMI Harmonic Synthesizer arpeggio mode(s)


Post Posted Tue Feb 13, 2007 12:52 pm
ZooTooK


Posts: 19

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!
Post Posted Tue Feb 13, 2007 1:17 pm
ZooTooK


Posts: 19

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....
Post Posted Sat Feb 17, 2007 5:36 pm
LeoDaV


Posts: 259

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.
Post Posted Sun Feb 18, 2007 10:54 am
GeeJee
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Additive synthesis, roight?
:mrgreen:
Post Posted Sun Feb 18, 2007 1:39 pm
LeoDaV


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GeeJee wrote:Additive synthesis, roight?
Yes. :D

J.
Post Posted Sun Feb 18, 2007 4:02 pm
GeeJee
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Obviously. And I knew the answer.

Still, I don't think it was not mentioned in this thread before... :P That's why :P
:mrgreen:
Post Posted Sun Feb 18, 2007 11:19 pm
ZooTooK


Posts: 19

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...)?
Post Posted Sun Feb 18, 2007 11:52 pm
GeeJee
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No, digital oscillators. There's additive synthesis under the bonnet... ;) Don't confuse that with the commonly found subtractive synthesis...
:mrgreen:
Post Posted Mon Feb 19, 2007 7:50 am
Analog-Umph


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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? :?
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Mon Feb 19, 2007 6:57 pm
GeeJee
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Boot? What boot? :lol:
:mrgreen:
Post Posted Fri Feb 29, 2008 4:03 pm
Analog-Umph


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GeeJee wrote:Boot? What boot? :lol:
Damn missed this one :lol:

You know, you have bonnet and then boot. :pwned:
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Fri Feb 29, 2008 4:08 pm
radek tymecki


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are there any schematics for rmi harmonic?
Post Posted Fri Feb 29, 2008 5:36 pm
Analog-Umph


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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. :lol:
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Fri Feb 29, 2008 5:50 pm
Nico_Noyau
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Would be damn interested in getting the schematics of the filter :P
Oh, I have to look for it, I'm off :P
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Post Posted Mon Mar 10, 2008 10:18 am
Analog-Umph


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Some interesting reading: http://matrixsynth.blogspot.com/2007/05 ... sizer.html
Without faith nothing is possible. With it, nothing is impossible.







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