Hello,
----- Original Message -----
From: <sonic@...>
To: <SergeModular@yahoogroups.com>
Sent: Wednesday, May 16, 2001 12:49 AM
Subject: [SergeModular] Re: "bit-decimation"
: --- In SergeModular@y..., "John" <jpyyz@y...> wrote:
: > Well you certainly got my attention. I LOVE bit-
: decimation/reduction,
: > distorion, wave mangling... I don't own any serge modules yet
: (hoping
: > to put a "Frankenstein" system together from different companies by
: > summer's end which will include some stuff from serge), but I would
: > love to hear about these patches anyway. It will give me something
: to
: > think about while I wait to put together my system :)
:
:
: OKEE DOKEE PAL.I OFFERED THIS TO EGRES .WHATEVER. YOU DONT NEED
: SERGE GEAR TO DO IT , BUT IT HELPS..I KNOW DOEPFER DOES IT LESS WELL
: (FAIR ENOUGH THOUGH...)
: IN SHORT USE A GOOD SAMPLE AND HOLD MODULE ,CLOCKED AT AUDIO
: FREQS ,WITH THE AUDIO DUE FOR "DECIMATION" USED AS THE SAMPLE SOURCE.
: THE LOWER THE CLOCKING FREQ. , THE MORE THE "DECIMATION" TO THE
: S&H'D OUTPUT .AS THIS IS USUALLY A DIGITAL EFFECT.......
It is called samplerate. As you know the data on most audio CDs is for
example sampled and held 44100 times a second.
: THE FUZZ-ULATION F.X. COME FROM USING AUDIO NOT TRIGGERS/GATES AS
: AN INPUT INTO THE COMPARATOR MODULE .IF YOU USE SLIGHT (OR STRONG)
: VARIANTS IN BOTH INPUTS YOU GET VARIANTS DEPENDING ON WHICH SIGNAL
: YOU PUT INTO WHICH INPUT (BOTH OPTIONS ARE DIFFERANT TO THE SINGLE
: SIGNAL BEING FED INTO EITHER SINGLE INPUT TOO.
A comparator output has a bitrate of 1 (= two possibilities).
You are speaking of creating a variable pulsewidth wave I think. Any pulse
wave is theoretically (not electrically mostly) a one bit information
string. Each PWM wave derivation method that I am aware of has one or more
of these musically relevant properties:
a "pop" noise (two half 50% cycles instead of full cancellation at 100%/ 0%
border);
linearly flowing vertical phase shift, swapping direction of full DC bias at
100%/ 0% border; (*)
horizontal phase shift (no fixed edge);
warbling pitch shift (but fixed edge).
(*) This is the case when subtracting two slightly detuned sawteeth. It
looks as if this was a through zero phaseshift but certainly does not sound
like it. Scientists I have asked could not offhand decide on this
phenomenon, or wether through zero PWM could exist at all?
In general, the one bit realm is a very interesting and often underestimated
niche. The STS Serge is an excellent assortment to get deeply into complex
pulse waves throughout a very wide frequency spectrum and even on small
systems as very complex waves can be realized with just two oscillators and
that couple of 1 or 2 inch modules.
Sebastian Kuehnl
: S'FUNNY ,IT'S A NON PRESENT OWNER WHO IS INTERESTED .ME , I TAKE
: ADVICE FROM ANYONE & FILTER,EXPAND,INVENT,THEORISE.....PLEASE TELL ME
: I'M NOT THE ONLY SERGE OWNER LIKE THIS , SURELY ?
:
: BEST WISHES & GOOD LUCK .YOU'LL LOVE YOUR sERGE , I KNOW IT.
: p.k.
:
:
:
: >
: > John
: >
: >
: >
: >
: > > If anyones interested I have a couple of simple patches
: (actually
: > > descriptions) to do analogue "bit-decimation" on the Serge , Also
: a
: > > cool Fuzz type effect w/ cross-fuzzulation type properties , but
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