[sdiy] FM

[Magnus Danielson]

From: "Paul Maddox" <Paul.Maddox at Wavesynth.com>
Subject: [sdiy] FM
Date: Fri, 19 Apr 2002 22:53:48 +0100

> Dear all,

Dear Paul,

>  Ok further to my 4quad multiplier question..
> 
> FM is basically shifting the pitch of one signal depending on the level of
> another signal, yes?

No... shifting the _frequency_ here and there... the end result is a
Bessel-function in amplitude.... big wide spectrum...

> 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?

No. You'd get an SSB-modulation (a variant of the Amplitude
Modulation), but that's about it.

Cheers,
Magnus