Congrats to Mike Marsh and the others on showing off there MOTM's and the
inspiration. Mike .M can you email me privately please ?
Thx, Jim
Microtonal wrote:
>
> >
> > 5) I also hope to have my Mac app translated into physical hardware in
> about
> > 10 days. Analog Devices, which
> > makes a critical chip for the design, has assured me it won't kill it or
> > jack the price up 60% (IT IS A $30 CHIP!).
> >
> > If the concept proves MOTM-worthy, then this will be the next module after
> > the '130. What is it? Errrrr......let's
> > call it a "Timbre Modulator" for now :) I may have to use a rotary
> switch,
> > which I ∗do not like∗, but there's no way
> > around it. Grrrrr.........
> >
>
> So, after perusing the latest Analog Devices ICs, I can't help making the
> following conjectures for the Schreiber/Rich/Scholz MOTM module, just for
> fun:
>
> 1. Pitch Shifter using AD SamplePort (TM) Sample Rate Converter - These
> chips can upshift and downshift sample rates through digital interpolation
> and decimation. Add a 1 volt per octave interface and you could have
> exactly
> tracking doubled oscillators. Put in 3, get 6 out! You could add them
> after your filter or VCA and virtually duplicate the entire voice, though
> envelopes and fixed formants would have chipmunking effects. The AD1890
> comes in a DIP package and shifts in ranges from 1:2 to 2:1. The higher
> performance AD1896 comes in a surface mount SSOP package but can
> shift by 1:8 or 7.75:1.
>
> Note that I'm pulling your leg here. This WON'T WORK, at least not without
> some extensive digital post processing - I'll give y'all three guesses why.
>
> 2. CSOUND Module - This would be either the most brilliant or stupid idea
> in analog modular history. A programmable digital synthesizer module in an
> analog module package. Uses AD Extended CSOUND and SHARC DSP.
> Could be a fixed algorithm, or let you program your own. Problem is, these
> DSP chips only come in QFP or BGA surface mount packages, not exactly
> DIY.
>
> 3. Pseudo Analog Shift Register - Uses AD5533 or AD5532 32 channel infinite
> sample and hold. Multiplex the 32 outputs and you've got analog shift
> registers
> galore and/or an arpeggiator. Unfortunately, these only come in BGA
> packages and also break the $30 price range.
>
> 4. Analog Multiplier/Divider/Exponentiator - Uses AD538 Analog computation
> unit to take you beyond ring modulation.
>
> 5. Numerically Controlled Oscillator - AD7008 - Digital phase accumulator
> oscillator with sine and cosine lookup tables and 10 bit D/A output. This
> would be pointless, I admit, just buy another MOTM-300 instead and get some
> analog warmth.
>
> John Loffink
> microtonal@...
>
>
>
>
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