Final answer:
A computer's TV tuner card that can tune DTV channels requires received channels to be in digital format, possibly including HD. An ample signal strength is also necessary for quality reception, whether the broadcast is coming over the air using VHF or UHF frequencies or through cable or satellite systems.
Step-by-step explanation:
For a computer's TV tuner card that can tune digital TV (DTV) channels, the received TV channels must be in the digital format rather than analog to ensure compatibility. During the transition period led by the FCC, which lasted until at least 2006, broadcasters and consumers were already shifting to digital equipment. The shift was important because digital broadcasts allow for higher quality in both audio and video through technologies such as high-definition (HD). Digital channels operate under different parameters than the older analog frequencies, where TV video signals were AM, and TV audio signals were FM, typically received through traditional roof antennas. Moreover, digital channels are capable of providing better visual and audio signal quality over the air utilizing either VHF or UHF frequencies or via cable and satellite systems that use even higher frequencies.
It's essential that the digital channels are available in the location of the receiver and that the tuner card is capable of decoding the specific formats used, such as HD. Furthermore, the signal strength must be ample for reliable reception, meaning that the user may need a suitable antenna system if receiving broadcasts over the air. The signal quality can directly affect the viewing experience, with poor signal strength resulting in a degraded picture or sound.