How Technology Is Changing How We Treat IG 演算法
http://sergioeajc114.image-perth.org/the-ultimate-cheat-sheet-on-ig-guang-gao
Given that HDMI is a digital sign, it can't be degraded much in advance of the picture and audio is not longer decipherable. On analog alerts, you can find a large amount of degradation right before the picture