ABSTRACT
With any HD camera we are dealing with a camera capable of recording an image of massively greater resolution. Curiously the NTSC system delivers almost exactly the same data rate per second as the PAL system. This is a result of the limiting transmission bandwidth available to both systems at their inception. NTSC has to transmit 525 lines of information 30 times a second, 30 complete frames per second derived from their 60 cycles per second mains supply frequency. So 525 30 15 750 lines per second. PAL has to transmit 625 lines 25 times per second, the local mains here having a frequency of 50 cycles per second. So 625 25 15 625. Remarkably similar figures given the gap of the Atlantic Ocean, caused by very similar limitations on the amount of data that could be economically transmitted.
