>From: "Summa" <flotorian@...>

>DC = Direct Currency... a constant value above or below the X-Axis...

I'm a newb... but not that much of a newb!

or

Maybe I am that much of a newb... I don't know... :-)

I have built a simple fm synth with Reaktor using a Sine for both the
Carrier and Modulator (everything AC), so I'm uncertain where the DC-offset
concept you mention comes into play? Is it somehwere in the math?

Here are the equations I have found:

For *pure* FM synthesis... (the "0" after the B is supposed to be an
integral sign...you can see it better from the link)

cos(wct + B0t f(t) dt)

http://ccrma.stanford.edu/software/snd/snd/fm.html

---------

For PM synthesis which yields similar results and is used widely in the
digital world:

x(t) = sin[2*p*fc*t + I * sin(2*p*fm*t)]

http://www.wam.umd.edu/~mphoenix/dss/dss.html

---------

Is the offset you are reffering to one of the constants in those equations?
Or is it like having the resultant rise above the x-axis on an oscilliscope?

Thanks again,
Andy



> > >From: "Summa" <flotorian@...>
> >
> > >Hi Andy,
> > >
> > >well, PM isn't reacting on DC-Offset, while FM does with pitch
> > >shifts, unless you decouple it.
> >
> > Hello Summa, thanks for the reply.
> >
> > Unfortunately I don't know what DC-Offset or decoupling is. Not that far
> > yet! I will try looking them up... if you can reccomend a synthesis
> > dictionary or wiki I am much obliged...
> >
> > >I think that's the most important difference from the sounddesign side,
> > >what can be solved by for
> > >instance adding a HP filter to the FM input...
> >
> > Again, since I don't know what coupling or DC-offset is, I can't
>understand
> > what adding a HP filter will do, besides attenuate the overtones of the
> > modulator... but I will do more research...
> >
> > The link you sent me looks great, and after only a glance, I think I
>might
> > be able to comprehend it with what I have learned so far. Do you know if
>the
> > code at the bottom is for Csound, or only for C?
> >
> > Cheers,
> > Andrew
> >
> > _________________________________________________________________
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> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
>--
>
>CZ/VZ mailing list : http://groups.yahoo.com/group/CZsynth
>FMHeaven mailing list : http://groups.yahoo.com/group/fmheaven/
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>Vokator mailing list : http://groups.yahoo.com/group/vokator
>
>http://www.summasounds.de/
>

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