Digital Transition - Scenario 5
Digital Off-Air (8VSB) Reception - Digital CATV (QAM) Viewing
| Source | Distribution Network | Viewing Location |
| Digital
Off-Air (8VSB) |
Coax/HFC/Ethernet | Digital TV - CATV Mode (QAM) |
| Explanation: | |
| It is common for digital televisions to only lock to digital (CATV) signals when the digital television is set or tuned to the "CATV" mode. This creates difficulties for systems/facilities transmitting standard ATSC digital off-air or broadcast 8VSB signals. This solution solves this problem by converting an entire digital off-air channel to a digital (CATV) signal. | |
| Application: | |
| This eliminates the problem of having to reprogram the television every time the customer wants to switch between digital CATV and digital off-air channels. | |
| Component Block Diagram | Further Information |
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Component Block Diagram - Details
Antennas s are selected based on the frequency/channel that is to be received, not the content. All off-air/broadcast antennas will receive both analog and digital signals; however, receiving the new digital off-air (8VSB) channel may require a new antenna because of the new channel frequency assignment of the digital channel.
The necessity for a pre-amplifier cannot be determined until a site survey is performed. If required, the pre-amplifier is mounted outside on the antenna mast, and requires a separate power supply that is mounted in the building. The appropriate power supply for the pre-amplifier being used must be specified separately.
The QAM Transcoder is the system component that receives the digital off-air (8VSB) channel and changes the modulation scheme. The ATSC to QAM Transcoder is a modular unit that receives either a digital off-air (8VSB) or digital CATV (QAM) signal and transcodes it to any CATV QAM channel. The transcoding enables televisions with QAM digital tuners to seamlessly view the Off-Air Digital (8VSB) signals on cable television frequency assignments without having to change the television tuner input from 'CATV' mode to 'Off- Air' mode. The input digital signal is stripped of its original digital modulation (8VSB or QAM), leaving just the basic data stream. The transcoder then creates a new, clean QAM carrier and reinserts the original data stream on to this new QAM carrier. If the original channel was encrypted, it will remain encrypted, if the original channel was in the clear, it will remain in the clear.
Functionality
It is common for digital televisions to only lock to digital CATV (QAM) signals when the digital television is set or tuned to the "CATV" mode. This creates difficulties for systems/facilities transmitting standard ATSC digital off-air (8VSB) or broadcast signals. This solution solves this problem by converting an entire digital off-air (8VSB) channel to a digital CATV (QAM) signal. This new QAM channel will be available in the CATV band permitting the current generation of digital televisions that are integrated with QAM tuners to easily tune and display the television picture. This eliminates the problem of having to reprogram the television every time the customer wants to switch between digital CATV (QAM) and digital off-air (8VSB) channels.