Digital oscs, analogue filters?

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pflosi
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Re: Digital oscs, analogue filters?

Post by pflosi » Tue Nov 19, 2013 8:53 am

Great idea. Let's find them all! Maybe you could update the original post with the complete list...

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Re: Digital oscs, analogue filters?

Post by nathanscribe » Tue Nov 19, 2013 10:25 am

pflosi wrote:Maybe you could update the original post with the complete list...
Wilco 8-)

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Re: Digital oscs, analogue filters?

Post by nathanscribe » Tue Nov 19, 2013 10:26 am

rhino wrote:Off-center, but the Korg Poly-61 has one analog and one digital (divide down) oscillator thru an analog filter.
Really? Not that I did not know! Interesting.

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Re: Digital oscs, analogue filters?

Post by pflosi » Tue Nov 19, 2013 11:25 am

nathanscribe wrote:
pflosi wrote:Maybe you could update the original post with the complete list...
Wilco 8-)
:thumbleft:

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Re: Digital oscs, analogue filters?

Post by nathanscribe » Tue Nov 19, 2013 1:09 pm

OSC OSCar added (combination of traditional waveforms and user-definable harmonic content)

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Re: Digital oscs, analogue filters?

Post by Micke » Tue Nov 19, 2013 4:06 pm

Samplers:

SCI Prophet 3000
E-mu Emulator III
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Re: Digital oscs, analogue filters?

Post by Z » Tue Nov 19, 2013 4:27 pm

Do 80s Akai samplers processed through AX60, AX73 or VX90 count?

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Re: Digital oscs, analogue filters?

Post by nathanscribe » Tue Nov 19, 2013 5:12 pm

Z wrote:Do 80s Akai samplers processed through AX60, AX73 or VX90 count?
They use CEM filters, don't they... do you know how the process works? It's not simply an audio input, is it, it's something to do with using the samplers as effectively external oscillators, I think, but correct me if I'm wrong.

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Re: Digital oscs, analogue filters?

Post by ryryoftokyo » Tue Nov 19, 2013 6:47 pm

Aren't the Korg Poly 800s oscillators digital? I know they're referred to as digitally controlled oscillators, and are often thought of in the same way as the Juno series, but I keep seeing that they're fully digital. Can anybody confirm or deny that?
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Re: Digital oscs, analogue filters?

Post by nathanscribe » Tue Nov 19, 2013 7:15 pm

The Poly 800 generates square waves only, using a MSM5232 IC. I don't know the technical details of how this IC functions, but it has a set of square wave outputs at multiple footings, driven by a programmable timer which is in turn controlled by the CPU. The Poly 800 combines these into "sawtooth" waves by layering 4 octaves of squares at inversely proportional levels. Sonic variation is achieved by switching on or off any of those 4 squares.

I'll not add it to the list, for two reasons: 1) It's more in sympathy with an organ combining footings rather than actual digital waves of any interest, and 2) It's paraphonic filtering leans it more towards stringer territory.

There are other synths that build pseudo-sawtooth waves from clocked logic, such as the Korg Lambda, Elka Synthex, and Crumar Bit series; there are also interesting variations on how to achieve waveshaping using a combination of logic and analogue circuits, such as the Korg PS beasties, Roland Jupiter 4, and EDP Wasp; and they're interesting in their own ways I think, but my intention for this list was synthesizers that utilise fully digitally generated waveforms (ie., memory and binary and all that, rather than an analogue treatment of high/low voltages).

Hope that makes sense. 8-)

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Re: Digital oscs, analogue filters?

Post by cornutt » Tue Nov 19, 2013 7:25 pm

IIRC the Emulator I had no filters, unless the JL Cooper "genmod" was installed. The Emulator II was the first one to come from the factory with VCFs.
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Re: Digital oscs, analogue filters?

Post by nathanscribe » Tue Nov 19, 2013 7:39 pm

cornutt wrote:IIRC the Emulator I had no filters, unless the JL Cooper "genmod" was installed. The Emulator II was the first one to come from the factory with VCFs.
Cool. Thanks.

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Re: Digital oscs, analogue filters?

Post by Z » Tue Nov 19, 2013 8:44 pm

nathanscribe wrote:
Z wrote:Do 80s Akai samplers processed through AX60, AX73 or VX90 count?
They use CEM filters, don't they... do you know how the process works? It's not simply an audio input, is it, it's something to do with using the samplers as effectively external oscillators, I think, but correct me if I'm wrong.
I haven't tried it yet, but I will be soon. It is my understanding is the each voice from the sampler is run through the 13 pin DIN cable to the synth's pre-VCF mixer section. The sampler's voices can be mixed with the synths VCOs.

I want to think I saw on an Akai brochure back in the day a 13 pin DIN cable with 1/4" plugs so you could essentially give the S900 individual outs.

Don't quote me, but I think the Akai synths use SSM filters.

I only suggested this combination since you were also including samplers.

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Re: Digital oscs, analogue filters?

Post by nathanscribe » Tue Nov 19, 2013 8:58 pm

Z wrote:Don't quote me, but I think the Akai synths use SSM filters.
Too late ;)

I guessed at CEM because the AX73 uses them... but please report back on your experiences, it'll be interesting.

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Re: Digital oscs, analogue filters?

Post by Sir Ruff » Tue Nov 19, 2013 10:07 pm

cornutt wrote:IIRC the Emulator I had no filters, unless the JL Cooper "genmod" was installed. The Emulator II was the first one to come from the factory with VCFs.
There was a filter (and filter cutoff control) on all of them. The genmod mod just allowed modulation and resonance of the filter that was already there.
Z wrote:Don't quote me, but I think the Akai synths use SSM filters
No, they all use the same chip-on-a-synth CEM 3394 chip. But if we're including samplers, I think the akai synths should be included. An akai sampler + akai synth combo is a digital oscillator + analog filter in the truest sense.
Do you even post on vse bro?

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