The ATSC (Advanced Television Systems Committee) signal format is approximately 19.3 megabits per second, approximately 17 megabits of which is the video portion. Broadcst stations may use 15 megabits or less for the main HDTV channel it they are broadcasting subchannels. Four or more standard definition broadcasts can be carried in the same 19.3 megabits used for a single HD broadcast.
In over-the-air (OTA) signal is actually ~32 megabits per second, since error-correction is included that can reconstruct missing data that was lost via atmospheric or other transmission problems.
On delivery systems with more resilient transmission methods, eg. cable or satellite, FiOS, less error-correction is required.
Cable systems (as well as FiOS) for example typically strip away most error-correction data because it's not needed. On a 6-MHz cable slot, using 256-QAM modulation, cable operators can trasnmit two 19.3 megabit channels. Keeping that in mind using OD services via FiOS is not an issue.
In over-the-air (OTA) signal is actually ~32 megabits per second, since error-correction is included that can reconstruct missing data that was lost via atmospheric or other transmission problems.
On delivery systems with more resilient transmission methods, eg. cable or satellite, FiOS, less error-correction is required.
Cable systems (as well as FiOS) for example typically strip away most error-correction data because it's not needed. On a 6-MHz cable slot, using 256-QAM modulation, cable operators can trasnmit two 19.3 megabit channels. Keeping that in mind using OD services via FiOS is not an issue.
