Dialog still rolling

[Paul Schreiber]

Bernie Hutchins did several issues dedicated to this topic. I shall dig....

Paul Schreiber

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From: 	Thierry Rochebois[SMTP:thierry.rochebois at ief.u-psud.fr]
Sent: 	Friday, April 18, 1997 1:59 PM
To: 	synth-diy at horus.sara.nl
Subject: 	Re: Dialog still rolling


>> Q)How many oscillators can do thru-zero PWM?  Thru-zero FM?  Not every VCO 
>> design lends itself to these capabilities, does it?
>> 
>> No, but I don't know of any commercial synth that has thru-zero FM. 
>> The 3340 can do linear FM, which is required for DX-7/Synergy type sounds.

>   Erm, what is thru-zero FM?!

Negative frequency i.e. negative phase accumulation : easy to implement
digitally, quite hard to implement in analog (especially with a sawtooth
oscillator).

Maybe a triangle oscillator plus input comparator and control unit will
do that job !?... Any idea ?

Thierry Rochebois