[sdiy] FM

[Peter Grenader]

Late reply to this, but my two bits.

Your definition of FM is not wrong, but possibly not complete.

What you are talking about here, listening to the sum and difference alone,
is what the Buchla freq shifter did and it is a really great effect.
hearing one without the other cuts down on sidebands significantly.  Not
that they are bad mind you, but the resulting sound without them together is
very rich in timbral information, yet still 'pure', if that makes any sense
wuzoever.

i do not know if other frequency shifters did this, as the buchla is the
only one i have ever worked.  i'm going to have a look at the Analogue
Systems box right now....i'm curious

i think Grant has a module that does this.  He rarely ever responds to these
quesitons I post here...so I'm not going to ask!

> Dear all,
> 
> Ok further to my 4quad multiplier question..
> 
> FM is basically shifting the pitch of one signal depending on the level of
> another signal, yes?
> 
> so,
> 
> if a ring mod gives me a signal output which is sig1+sig2 and Sig1-sig2,
> could I not filter off the difference and just keep the sum, this wouldnt be
> TRUE FM I know, but it ought to sound pretty close, shouldn't it?
> 
> Paul
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