[sdiy] Analog polyphony question

[Dr Strangelove]

Actually I had said that the Vox Jaguar does something different.  I meant 
the Vox Continental (hmm, this sounds like some sort of suspicious 
backpeddling to save face).  It uses high frequency Hartley Oscillators 
(Signal tapped from a split inductance in a resonant circuit), and a strange 
sort of divider circuit to derive the lower octaves.  The wierd thing about 
it is that I think it outputs something besides square waves, The Jaguar 
sounds like square waves though.....  Kinda like a beefed up thomas organ 
but with a vox vibrato.  I've heard both of them, in, errrr, samples I've 
tracked with  :-).

         -=<Jonathan Pratt>=-
       (Phdinfunk at hotmail.com)




>From: "Happy Harry" <paia2720 at hotmail.com>
>Reply-To: harrybissell at prodigy.net
>To: don at till.com, phdinfunk at hotmail.com
>CC: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Analog polyphony question
>Date: Mon, 13 Aug 2001 15:12:01 +0000
>
>The Vox Jaguar used 12 high frequency oscillators with
>divider chains for each semitone.
>
>12 little circuit boards all screwed down across the length of
>the keyboard...
>
>H^) harry
>
>
>>From: Don Tillman <don at till.com>
>>To: phdinfunk at hotmail.com
>>CC: synth-diy at dropmix.xs4all.nl
>>Subject: Re: [sdiy] Analog polyphony question
>>Date: Sun, 12 Aug 2001 21:11:29 -0700 (PDT)
>>
>>    From: "Dr Strangelove" <phdinfunk at hotmail.com>
>>    Date: Sun, 12 Aug 2001 23:27:58 -0400
>>
>>    I was reading recently about TOS based organs, Thomas Organ Co.,
>>    Farfisa, Wersi, etc, The Vox Jaguar used a similer approach but
>>    didn't use a TOS IC so it didn't have JUST square waves I think.
>>
>>What did the Vox Jaguar do?
>>
>>Note that you're not stuck with square waves just because square waves
>>come out of the dividers.  You can sum octaves of square waves to get
>>a staircase, or you can use a cap, diode and resistor to get a half
>>exponential sawtooth.  The PolyMoog actually performs PWM on the
>>waves.
>>
>>    Basically the TOS ICs would divide a 1 or 2 Mhz square wave down to
>>    create the top octave then they would have other ICs to divide by
>>    2, 4, 8, 16 etc for the lower octaves, If you could tune the 1 or 2
>>    Mhz square wave then you could detune two TOS organs from each
>>    other, which would be kinda cool.
>>
>>The PolyMoog does this.  In several different ways.
>>
>>Another thing that the PolyMoog does is that it uses different divider
>>taps on the two Top Octave Generator ICs -- the second TOG chip is
>>clocked one semitone higher than the first TOG chip, and the outputs
>>are all corresponding shifted down a semitone.  This means that there
>>won't be an unnatural sync between the two TOG chips.  That's very
>>clever.
>>
>>(More details on my Moog Patents page:
>>   http://www.till.com/articles/moog/patents.html)
>>
>>   -- Don
>>
>>--
>>Don Tillman
>>Palo Alto, California, USA
>>don at till.com
>>http://www.till.com
>>
>
>
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