Re: Bruins vs. State of Union

[Garrett Wollman <wollman@lcs.mit.edu>]

<<On Wed, 29 Jan 2003 23:15:15 -0500, "A. Joseph Ross" <lawyer@attorneyross.com> said:

> I appreciate all the facetious responses, but can someone answer the
> question seriously?

C-QUAM AM stereo works just like multiplex FM stereo: the main program
channel gets L+R and the stereo subcarrier gets L-R.  So if the
programs were completely different, most listeners would hear the two
mixed together, probably with some nasty distortion resulting from
having so much information in the L-R channel.

Kahn's AM stereo system used ISB (Independent SideBand) modulation
instead: left channel in the lower sideband and right channel in the
upper sideband.  The AM detector in a mono receiver naturally mixes
the two together, if the radio is tuned exactly on center frequency.
The advantage of this system was that it could be effectively decoded
with two mono (analog-tuned) radios, one tuned slightly low and one
tuned slightly high.

-GAWollman