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Re: AW: AW: [Doepfer_a100] discontinuation of all modules with CEM3320, CEM3340 and CEM3381/PA381

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  • Monroe Eskew
    Is it? What s the difference between the effect of having different cores? ... [Non-text portions of this message have been removed]
    Message 1 of 51 , Jul 31, 2008
      Is it? What's the difference between the effect of having different
      cores?

      On Jul 31, 2008, at 5:13 PM, selfoscillate wrote:

      >
      > right, linear fm on a110 and a111 is very different.
      >
      > --- In Doepfer_a100@yahoogroups.com, Bakis Sirros
      > <synth_freak_2000@...> wrote:
      > >
      > > but will it sound the same as the A111 when linear-FM'ed?
      > > i think that the A110 is a saw core osc, right?
      > >
      > >
      > >
      > > Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
      > > [Doepfer_a100] group owner
      > > www. parallel - worlds - music. com
      > > www. myspace. com/ parallelworldsmusic
      > > www. myspace. com/ interconnectedmusic
      > > www. myspace. com/ memorygeist
      > > www. DiN. org. uk
      > > www. musicamaximamagnetica. com
      > > www. shimarecords. co. uk
      > > www. rubberrecords. gr
      > > Athens - Greece
      > >
      > > --- On Thu, 7/31/08, Alex Pearson <alexpears@...> wrote:
      > >
      > > From: Alex Pearson <alexpears@...>
      > > Subject: Re: AW: AW: AW: [Doepfer_a100] discontinuation of all
      > modules with CEM3320, CEM3340 and CEM3381/PA381
      > > To: Doepfer_a100@yahoogroups.com
      > > Date: Thursday, July 31, 2008, 6:51 PM
      > >
      > >
      > >
      > >
      > >
      > >
      > > I would actually buy a A-110 if it had that breakout box...
      > >
      > > On Thu, Jul 31, 2008 at 12:21 PM, Ross Goniakowski
      > <carfull@sbcglobal. net>wrote:
      > >
      > > > definately interested in this option...
      > > >
      > > > > Even the A-110 has an internal linear FM input available and
      > maybe we
      > > > could offer a breakout panel for the soft-sync and linear FM input
      > of the
      > > > A-110.
      > > >
      > > > [Non-text portions of this message have been removed]
      > > >
      > > >
      > > >
      > >
      > > [Non-text portions of this message have been removed]
      > >
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      > > [Non-text portions of this message have been removed]
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      >



      [Non-text portions of this message have been removed]
    • hardware@doepfer.de
      I should read your books more carefully :-) Dieter
      Message 51 of 51 , Aug 4, 2008
        I should read your books more carefully :-)

        Dieter


        > -----Ursprungliche Nachricht-----
        > Von: Doepfer_a100@yahoogroups.com
        > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von Florian Anwander
        > Gesendet: Freitag, 1. August 2008 11:17
        > An: Doepfer_a100@yahoogroups.com
        > Betreff: Re: AW: AW: [Doepfer_a100] discontinuation of all modules with
        > CEM3320, CEM3340 and CEM3381/PA381
        >
        >
        > Hi
        >
        > > Is it? What's the difference between the effect of having different
        > > cores?
        > The theoretically resulting waveform of FM is only "real" for the core
        > wave form. All other waveforms will be that, what the waveform converter
        > produces from the fm'ed core-waveform.
        >
        >
        > I uploaded two graphic files to the files section:
        > http://launch.groups.yahoo.com/group/Doepfer_a100/files/analog-fm/
        > These are excerpts from my book.
        >
        > I some months ago wrote the following text in private mail to Bakis,
        > which explains the images:
        > -----------------------snip------------------
        >
        > The most relevant thing is: FM with analogue VCOs has nothing to do with
        > the theoretical FM, because everything depends on the working principle
        > of the core oscillator (saw or triangle), and what the waveformconvertes
        > make out of the fm'ed core wave form.
        >
        > I'll attach two excerpts from my book:
        > analogue_fm.png explains what really happens in a saw based VCO. Left is
        > an log FM, right is the linear FM:
        >
        > * the first row (rectangle) is the modulator with an amount of +1V to -1V
        >
        > * the second row (400Hz saw) is the carrier
        >
        > * the third row shows the two saws which would be created by a CV of +1V
        > and -1V. In log FM this will be 1V up/down => 1 Octave up/down, =>
        > 800Hz/200Hz. In lin FM this will be 1V a certain frequency up/down, =>
        > lets say 200 HZ => 600Hz/200Hz. The higher result(800Hz or 600Hz) is
        > light grey; the lower result (200Hz) is dark grey. The two frequencies
        > look like two ramps with different steepness.
        >
        >
        > * Now the fourth line shows what really happens in the VCO: There is a
        > thin horizontal line, which is the threshold at which the Capacitor in
        > the core-oscillator is unloaded.
        > The rectangle switches between the two steepnesses. With the bigger
        > steepness of the 800Hz at the log FM the resulting wave form will reach
        > the threshold faster than with the "600Hz-steepness". As you can see the
        > threshold will be reached at the same time as with the original
        > carrier signal.
        >
        > Thats the one graphic.
        >
        >
        > The second graphic shows, the same FM, but this time not the core saw
        > oscillator, but the output of different wave forms from the waveform
        > converter. The Modulator still is the known rectangle.
        > Line a shows what we would expect for a triangle carrier.
        > Line b shows what we would expect for a rectangle carrier.
        > Line c shows what we really will get at the triangle output.
        > Line d shows what we really will get at the rectangle output.
        >
        > The latter two show, what the waveform converter will create from the
        > originally FM'ed saw from the core-oscillator. Here you can see that
        > this has nothing to do with real FM
        > -----------------------snip------------------
        >
        > ------------------------------------
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