[quote:0f984756f4=*J
Jörg schrieb:
Hat der Pulse nicht DCOs?
Ja.
Wobei es auch da verschiedene Formen gibt.
IMO, there are quite a lot of nuances of VCO-DCO. Let me try and make
the whole chain from "analogue" to "digital" (Though I wouldn't say strictly
from "good" to "bad" ;->)
(1) free running analogue oscillator, controlled by analogue voltage divider
keyboard. (Minimoog, ...)
(2) free running analogue oscillator, controlled by digital via a D/A
converter
without correction, and analogue modulation (Oberheim n-voice (?) )
(3) free running analogue oscillator, controlled by digital via a D/A
converter,
with autotune, scale correction and stuff, but still analogue modulation
(Sequencial Circuits Prophet5 rev. 3)
(4) free running analogue oscillator, controlled by digital via a D/A
converter,
with autotune, scale correction and digital LFO / Sample&Hold / Glide
modulation, but with analogue ADSR->VCO modulation (Oberheim OB-8).
(5) free running analogue oscillator, controlled by digital via a D/A
converter,
with autotune, scale correction, and all modulations including ADSR via
DAC (Sequential Prophet 600).
(6) free running analogue oscillator, controlled by digital via a D/A
converter,
with autotune, scale correction, and all modulations including ADSR via
DAC, plus automatic autotune in the background from time to time
(Oberheim Matrix12 (?)).
(7) Simple Ramp-Oscillator that is synced by a counter every cycle, but
with different clock/divider tree for both DCO's in a voice (Oberheim Matrix
6,
EDP Wasp)
(8) Simple Ramp-Oscillator, that is synced by a counter every cycle, but
with one single clock/divider tree for both DCO's in a voice (Oberheim
Matrix 1000)
(9) Staircase Waveform stuff (as described in different recent mails)
(10) Wavetable stuff (also as described in recent mails)
These are the different types I know of. Maybe there are still others in
between.
Speaking in the word's original sense, (2) - (6) would be something like
"DCVCOs" ("digital controlled VCOs") in the sense of a digital word forms
an analogue voltage that controls an oscillator. (7) and (8) would be real
"DCOs", cause they are still oscillators, only under the iron grip of
digital
clock, which makes them sound thin and lifeless. (9) and (10) shouldn't
be called "controlled oscillators" anymore, perhaps just call them "DOs"
("digital oscillators") or even closer to the point, "DDs" (digital
dividers)
or "DS's" (digital scanners). Well, but that would go too far then.
Oh, I forgot another interesting variation:
Analogue oscillators with digital dividers / waveforms:
(11) analogue VCO with dividers (some ARP-synths - thank You Joachim,
for the schematics! - and of course the Suboscillators in various VCO-
based synths)
(12) 12 analogue VCOs for the 12 top-octave-semitones and digital
dividers (Farfisa VIP 245, Korg PS-3x00 series)
JH.
(Jürgen Haible)
hat mir gesagt die Rechteckswellenform ziemlich sicher digital erzeugt wurde.
Nach mp3- und Bilderklau jetzt auch noch Sprücheklau:
