would this be interesting?
Kyle Farrell
orb at ee.washington.edu
Fri Jan 10 05:30:59 CET 1997
Hi-
I'm trying to come up with an idea for a monosynth for a senior level EE
design project. What I'm planning to do is the basic
osc -> filter -> amp scheme, all under cpu control. I'm going to be
using a CEM3379 for the filter/amp, though I'd like to try something
unusual for the oscillator.
What i've thought about doing is having two digital oscillators and
switch between them at audio rates. The user could define a point where
the output would switch from one oscillator to the other. The
oscillator would first output waveform "A". Then at the point in the
cycle where the "switch point" is reached the output would switch to
oscillator "B" until the end of the cycle. The next cycle would begin
with "A" again. Using a triangle and square wave you could get something
like this:
"A":
--
- -
- -
- -
- - -
- -
- -
- -
- -
--
"B":
-----------
|
|
|
|
|
|
|
|
---------
output:
-- ---
- - | |
- -| |
- | |
- |
|
|
|
|
--------------
^ switch point
The switch point would be modulatable by LFOs, envelopes, etc.
I tried this in Csound and it was, well, different. :) It might be nasty
with all those sharp corners on the output, but an analog filter would do
that some good. btw- is this at all similar to how the PPG or Prophet VS
work?
Does this seem like it would be an interesting project? comments &
opinion are welcome :)
thanks
-kyle
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