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1/F per Gold book

1/F per Gold book

2007-01-30 by simulacreant

How do I patch the 1/F function per p. 5-38 of the Gold Book without a
S/H Source on a NOISE module? What is the S/H Source, anyway? I see it
on the RS module.
Can I do this on my Animal panel, alone?
Thanks!

Re: 1/F per Gold book

2007-01-30 by mrcarp@comcast.net

Attachments :
    Furthermore, what is the 'randomly modulated sawtooth wave' at the S/H Output of the Noise Source?
    Can I use any random source to achieve the results on p. 5-39?
    Can I use Pink Noise for the 1/F patch?

    -------------- Original message ----------------------
    From: "simulacreant" <mrcarp@...>
    Show quoted textHide quoted text
    > How do I patch the 1/F function per p. 5-38 of the Gold Book without a
    > S/H Source on a NOISE module? What is the S/H Source, anyway? I see it
    > on the RS module.
    > Can I do this on my Animal panel, alone?
    > Thanks!
    >
    >

    Re: 1/F per Gold book

    2007-01-30 by Skot Wiedmann

    the s/h source is internally switched into the stepped
    generator when the switch is engaged, no patching
    necessary. with the switch in the other direction,
    you can patch anything into the input jack to sample
    and hold it.



    Show quoted textHide quoted text

    --- mrcarp@... wrote:

    > Furthermore, what is the 'randomly modulated
    > sawtooth wave' at the S/H Output of the Noise
    > Source?
    > Can I use any random source to achieve the results
    > on p. 5-39?
    > Can I use Pink Noise for the 1/F patch?
    >
    > -------------- Original message
    > ----------------------
    > From: "simulacreant" <mrcarp@...>
    > > How do I patch the 1/F function per p. 5-38 of the
    > Gold Book without a
    > > S/H Source on a NOISE module? What is the S/H
    > Source, anyway? I see it
    > > on the RS module.
    > > Can I do this on my Animal panel, alone?
    > > Thanks!
    > >
    > >
    >
    >
    > > From: "simulacreant" <mrcarp@...>
    > To: SergeModular@yahoogroups.com
    > Subject: [SergeModular] 1/F per Gold book
    > Date: Tue, 30 Jan 2007 17:30:41 +0000
    >

    ---------------------------------

    How do I patch the 1/F function per p. 5-38 of the
    Gold Book without a
    S/H Source on a NOISE module? What is the S/H Source,
    anyway? I see it
    on the RS module.
    Can I do this on my Animal panel, alone?
    Thanks!








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    Re: 1/F per Gold book

    2007-01-30 by Carbon111

    > How do I patch the 1/F function per p. 5-38 of the Gold Book without a
    > S/H Source on a NOISE module? What is the S/H Source, anyway? I see it
    > on the RS module.
    > Can I do this on my Animal panel, alone?

    Yes, you can do this with the s/h switch on your animal panel.

    You can also patch a random voltage generator with the noise and both halves of the smooth/stepped module:
    http://www.serge-fans.com/wiz_SSG3.htm

    Best Regards, James
    --
    http://www.carbon111.com/serge.html

    Re: 1/F per Gold book

    2007-01-30 by mrcarp@comcast.net

    Attachments :
      Sorry, found this in the archives but it doesn't seem to completely answer my question. It helps, though!

      Bob Hearn wrote:

      6. You can make a Random Voltage Generator even without a Noise Source!
      John described how to turn the SSG into an RVG, with smooth, stepped,
      and pulse random voltage outputs. This is also described in the Gold
      book (page 5-39). This is an incredibly cool patch - if you fully
      understand it, you have got the SSG down. However, one thing is that
      that patch requires the S/H source from a Noise Source module (or a
      Random Source, which includes a Noise Source internally). That signal
      is a randomly modulated sawtooth wave. The idea is that every time you
      sample it (unless two sequential times are very close together), you
      get a random voltage. (Actually the Gold book mistakenly says to use
      the S/H output, not S/H source - that will not work.) Well, it turns
      out you can make an RVG even without a Noise Source! Just use a regular
      sawtooth wave instead of the S/H source, say from a PCO. (A DSG would
      also work.) Set the PCO to high range, with the frequency knob at 12
      'clock. Now, this signal is not randomly modulated, so you might think
      it would not work - you won't get a random voltage when you sample it.
      But in fact, the overall system is chaotic; the samples you get are
      actually random, because they are sampled at random intervals - because
      the patch in fact works! It's circular - the samples are random,
      because the patch output voltages are random, because the samples are
      random... but it works. I haven't done the hairy math to ensure that
      the system will never get locked into a repeating state, but the output
      looks the same to me as an actual RVG. In dynamical terms, I believe
      the cyclic states are unstable.

      Note that if the sawtooth PCO rate is much faster than 12 o'clock, the
      patch doesn't work - I think because the signal is changing too fast
      for the Stepped section to lock onto. This makes sense given #1 above;
      the Stepped module is actually slewing for a brief period, and not
      actually sampling. Setting the PCO rate to 12 o'clock roughly matches
      the S/H source signal's mean frequency, btw. Of course, this is really
      only useful if you happen to have an SSG but no Noise Source... still,
      I think it's cool that you can get your randomness for free, as it
      were.

      -------------- Original message ----------------------
      From: mrcarp@...
      Show quoted textHide quoted text
      > Furthermore, what is the 'randomly modulated sawtooth wave' at the S/H Output of
      > the Noise Source?
      > Can I use any random source to achieve the results on p. 5-39?
      > Can I use Pink Noise for the 1/F patch?
      >
      > -------------- Original message ----------------------
      > From: "simulacreant" <mrcarp@...>
      > > How do I patch the 1/F function per p. 5-38 of the Gold Book without a
      > > S/H Source on a NOISE module? What is the S/H Source, anyway? I see it
      > > on the RS module.
      > > Can I do this on my Animal panel, alone?
      > > Thanks!
      > >
      > >
      >
      >

      Re: 1/F per Gold book

      2007-01-30 by Carbon111

      >Sorry, found this in the archives but it doesn't seem to completely answer my question. It helps, though!

      As I said, your Animal is good to go with this, check my last two mails. Also go to the root directory of that one link for more SSG fun!

      Best Regards, James
      --
      http://www.carbon111.com/serge.html

      Re: 1/F per Gold book

      2007-01-30 by mrcarp@comcast.net

      Attachments :
        Yep, thanks!

        -------------- Original message ----------------------
        From: Carbon111 <carbon111@...>
        Show quoted textHide quoted text
        > >Sorry, found this in the archives but it doesn't seem to completely answer my
        > question. It helps, though!
        >
        > As I said, your Animal is good to go with this, check my last two mails. Also go
        > to the root directory of that one link for more SSG fun!
        >
        > Best Regards, James
        > --
        > http://www.carbon111.com/serge.html
        >

        Re: Serge Buchla owners

        2007-01-31 by amnesia

        Just out of interest how many of you Serge owners own a Buchla 200e?
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        Re: Serge Buchla owners

        2007-01-31 by don hassler

        Will, as soon as it arrives.
        Don Hassler
        Show quoted textHide quoted text

        --- amnesia <amni56@...> wrote:

        > Just out of interest how many of you Serge owners
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        >
        >
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        Re: Serge Buchla owners

        2007-02-01 by buchla300

        --- In SergeModular@yahoogroups.com, amnesia <amni56@...> wrote:
        Show quoted textHide quoted text
        >
        > Just out of interest how many of you Serge owners own a Buchla 200e?
        >
        >
        > > Keep on Patchin'!
        > > Yahoo! Groups

        I have an original 200 and a Serge... nice combination

        Move to quarantaine

        This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.