[sdiy] FM

[harry]

Paul Maddox wrote:

> 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?

Yes... although it might be more complex when the signals are very close
in frequency.  Most communications FM have a carrier much higher than the
modulating signal... and audio synthesis is often frequencies that are close...

> 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?

Hmmm... if those frequencies are close the filtering will be really hard, yes
???
And if you really do it this way... you have to use pure sinewaves because all
the
harmonics will intermodulate as well...

where is this going
(don't tell me if you have to kill me once I know...)

H^) harry

>
>
> Paul
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