How to convert period CV to pitch CV

[Mark Smart]

Darn it!! There I go again with the typos!!! Here is that same message with
corrections in CAPITAL LETTERS. I need to read what I type more carefully!!


> There is an op-amp comparator which compares the input and output of the
> sample-and-hold circuit (whose output is the voltage proportional to the 
> string's period). If the INPUT of the sample-and-hold goes to a higher
> voltage than the OUTPUT, the comparator activates a transistor which shorts
> out the capacitor on the envelope follower circuit, causing its output to
> go to zero. At least, that's the best guess I can make based on the blurry
> schematic and the verbal description written by someone who speaks English
> as a second language in the service manual.
> 
> That makes sense, because that won't happen in the normal decay of an
> unchanging note, unless the second harmonic suddenly becomes louder than
> the fundamental, causing a pulse to come in  between the pulses from the
> fundamental.
> 
> 
> 
> 
> ________|________|________|____|____|________|________|  pulse train
> 
> 
>     ___-|    ___-|    ___-|              ___-|    ___-|  Integrator output
> __--    |__--    |__--    |__--|__--|__--    |__--    |  (=S/H input)
> 
> --------------------------------             ----------  S/H output
>                                 -------------
> 
>                                          ^
>                                   right here, S/H
>                                  INPUT exceeds OUTPUT
> 
> If this keeps happening over and over, it will cause the envelope
> generator's output to go way down.

I hope that makes more sense.

************************************************
*     Mark Smart                               *
*     Network Technician                       *
*     University Communications Inc. (UCI)     *
*     smart at medusa.nn.com                      *
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