CV -> FSK

[Grant Richter]

>I have asked this ones before, but I was not abble to read this list for 
>a while, so dunno if someone replyed to me about it.
>
>Anyway, If anybody knows, is it possible to convert CV signal to FSK, and 
>if is, how that is done??
>
>-tuukka
> tuukkal at paltamo.fi
>
>

Uh, dude the encoder is called a VCO and the decoder is called a Pitch to Voltage
converter. Subotnick pioneered the storage of control voltages onto analog tape.
(at least for electronic music :>)

You can use a amplitude modulated (AM) technique, set a VCO to a steady 1khz sine.
Run that through a VCA and apply the envelope to be stored to the VCA control.
Record the signal. Bring the signal back through an envelope follower and it will
recover the original DC envelope from the AM encoded stored signal.

That's too imprecise for pitch oriented control. Here you can use the frequency
modulation (FM) technique, set the exact pitch control voltages (i.e. pitches) to 
be stored. Record the VCO at 0DB with no envelope. Bring that audio back through
a properly calibrated P to V converter and you will recover very exact voltages.

The FM technique works best for discrete voltages, the AM for voltage slopes.

Hope this helps.

Grant