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Analog high-definition television - Wikipedia
Digital TV vs. Analog TV - Lifewire
Can You Still Use an Analog TV? - Lifewire
HDTV | Analog Devices
How to Tell If Your TV is Analog or Digital - Techwalla
Analog to Digital TV: How to Get HDTV - ecoustics.com
Television Frequencies - The RadioReference Wiki
Analog television - Wikipedia
How HDTV Works - HowStuffWorks
High-definition television - Wikipedia