H D image resolution is either 720 or 1,080 lines vertical, rendered by either progressive or interlaced scanning
Progressive scanning delivers a picture in 480p resolution, which is clearer than the 480i image provided by interlaced scanning
(all DVD players now on the U.
is a system that was devised in the early days of television to reduce the flicker generated in a progressive scanning system without using a wider bandwidth.
Then the demodulator converts the analog signals to digital signals and reduces the signals to baseband signals with central frequency at 10MHz, which are absolutely digital signals here, the MPEG decoder converts these digital signals to analog signals, the analog signals here are still interlaced scanning
signals which will become progressive scanning signals after the interpolation algorithm of back-end image processing.
This channel is displayed on a TV set through a process called interlaced scanning
, which presents half of the total 525 lines that make up a single screen at a time.