MOTM

My understanding is that Yamaha FM synthesis is actually using phase
modulation and not frequency modulation.  Am I correct?

Mike

--- In motm@y..., "Scott Evans, Gen Mgr" <esresource@e...> wrote:
> Ken and group,
> 
> I am curious if someone would elaborate a bit on this subject. Is it the
> case that the DX7 oscillators are "through zero"? Am I correct that this
> comment says that the MOTM VCO will not go through zero? I cannot see
> much relevance in the phase of the VCO output signal being important
> sonically, unless I am really missing something here. FM generates
> sidebands that extend equal sides of the carrier so what difference does
> the phase make? Is the sonic effect that is desired the actual passing
> through zero or is it some other issue?
> 
> Thanks in advance for a discussion.
> 
> Scott
> ----------------------------------------
> "Tkacs, Ken" wrote:
> > 
> > If you're going for the whole DX7 kind of thing, remember that
these VCOs
> > are not the "through zero" type (extremely few analog VCOs are),
meaning
> > that as the modulating signal goes negative, the output phase of
the second
> > VCO will not "reverse."
> >