raypsi wrote:
Hey OM:

The ole TV systems that used NTSC type signals, the video is Vestigial
Sideband.
So if what you say is TRUE then I never ever would have seen anything
on an NTSC tv but the low frequencies that are present in NTSC signal
part of the lower sideband.
All the now defunked, latest NTSC tv's used synchro' detection on the
Vistigial Sidband video.

In those TVs, the selection of the sideband is not done by the detector
but by an IF filter that passes only the frequencies of interest.

I did not say the synchronous detector cannot demodulate a single sideband,
I said it cannot select the sideband. So if you pass both sidebands
to the detector, it will demodulate both of them. Unless you use a
quadrature approach.

(and it cannot demodulate SSB because there is no carrier. in TV VSB
there is a carrier present that can be used to control the synchronous
detector)