How do analog TV broadcasts and DTV compare to each other?
There are some similarities. Both use VHF and UHF broadcast frequencies. While analog and digital television broadcasts have a modulated carrier wave, the way that signal is modulated is entirely different. Analog TV uses an amplitude-modulated (AM) signal for pictures and frequency modulation (FM) for audio, while DTV signals use digital “packets”, to transmit pictures and audio. The modulation system currently being used for DTV in the United States is Eight Level Vestigial Sideband (8VSB). As Terrestrial Digital / HDTV broadcasts become more prominent, UHF antennas will play a larger role because the majority of the HDTV/Digital channel allocations will be in the UHF frequency band.
• There are some similarities. Both use VHF and UHF broadcast frequencies. While analog and digital television broadcasts have a modulated carrier wave, the way that signal is modulated is entirely different. Analog TV uses an amplitude-modulated (AM) signal for pictures and frequency modulation (FM) for audio, while DTV signals use digital “packets”, to transmit pictures and audio. The modulation system currently being used for DTV in the United States is Eight Level Vestigial Sideband (8VSB). As Terrestrial Digital / HDTV broadcasts become more prominent, UHF antennas will play a larger role because the majority of the HDTV/Digital channel allocations will be in the UHF frequency band.
