Posted by Green Xenon [Radium] on 09/24/07 18:14

On Sep 24, 12:23 am, "Brian Gregory [UK]" <n...@bgdsv.co.uk> wrote in
http://groups.google.com/group/uk.tech.digital-tv/msg/e3f02036509d6ca6 :

> "Green Xenon [Radium]" <gluceg...@excite.com> wrote in
messagenews:46f6f08e$0$16535$4c368faf@roadrunner.com...
>

> > So QFM would use a combination of FM and PSK.
> > Would this decrease the
> > bandwidth required for broadcasting
> > FM luminance video signals?

> Think about it.
> Obviously there is no way FM and PSK can
> be going on at the same time in any
> way that can convey separate information.

How about FM and FSK [Frequency-Shift-Keying]?

Would this work if FSK is used in place of PSK?

> Worse still if you separately FM
> modulate two signals that start in
> quadrature with each other they won't
> stay in quadrature.

Okay. Then what is the *practical* FM-equivalent of QAM?

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