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Question about Digital Television and Radio

K

KML0224

Guest
Why is it that new digital channels are needed for analog TV stations making the switch, yet digital radio can use the existing frequency of an analog station?

Here in greater Hartford, WFSB-TV (CBS) of Hartford uses VHF channel 3 for analog and UHF channel 33 for digital.

Meanwhile, WDRC-FM 102.9 of Hartford advertises their HD service. The listener still tunes their HD radio to 102.9 FM.

Basically, what I'm asking is how are these digital subchannels for radio able to be at the same frequency while TV's digital needs a whole new channel?
 
A digital television channel requires about 200 times the bandwidth of an HD radio transmission. It takes a lot of digital information to create an HDTV signal plus any subchannels. You're talking around 19 Mbps versus somewhere less than 100kbps.

The digital audio on FM stations is transmitted on sidebands either side of the main analog signal. The overall transmission takes up a bit more bandwidth, but not enough to require any additional frequency allocation.
 
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