By David - K3DAV Here is one good example of how digital TV has
improved the technology in our favor. Digital stations can now
deliver more than one channel of programming on the same
channel. They are called subchannels or multi-channels. A
subchannel is an additional channel(s) of programming that can
be sent within the same digital bit-stream as the original main
channel. The old analog transmission used a carrier wave to send
a very wide carrier filled with several modulated waves at
different frequencies to transmit a video signal. How Do They Do
It? But how do they send a subchannel now we have digital.
Digital TV uses the same language that your computer uses. It's
called "Binary". Binary is a series of millions of codes made up
of ones and zeros. The analog video and audio are converted to
digital binary codes, then transmitted over the air in pulses
called "Packet Bursts". These pulses are received by your TV
which converts those ones and zeros back to analog so the video
can be displayed on your Scr