No such thing that I have ever heard of.
For an easy explanation of the modulation modes -- see URL:
http://www.williamson-labs.com/480_mod.htm

Perhaps you were thinking of commercial FM broadcasting -- there is a
baseband FM signal, a 19kHz pilot carrier, and a DSB suppressed signal at
38kHz.
All this yields stereo FM
Baseband is left plus right channel
the DSB signal is left minus right -- so after demodulation, adding them
gives Left and Right channels

--
73 From The KeyBoard In The Wilderness
"Bruce Kizerian" wrote in message
om...
Can anyone direct me to some good understandable references on single
sideband frequency modulation? I have no real practical reason for
wanting to know about this. It is interesting to me in a "mathetical"
sort of way. Of course, that is dangerous for me because my brain gets
very stubborn when I try to do math. Such ideas as "negative
frequency" kind of send my mental faculties into total shutdown.

But I read schematic very well. It is a visual language I can usually
understand. Seems like years ago there was an article on SSB FM in Ham
Radio. That would probably be a good start. If anyone can send me a
copy of that article I would be much appreciative.

Thanks in advance

Bruce kk7zz

www.elmerdude.com