The aim of this NBSC Player has been to see if it is possible to transmit full color NBTV pictures in a single analogue sound channel.
The signals can also be recovered by multiplying the signal by a square wave or sine wave that is in sympathy with the original carrier, because a sine wave averages out to zero over a full wave, if this recovering wave is at the same phase as the carrier then the signal will be recovered (averaged over a cycle) whereas the other signal being 90 degrees out of phase will not.
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