How does composite or coaxial use just one wire while HDMI or SCART need a ton on them
In: Technology
On Coax you had a mix of video and audio signal, but no way to convey any other information.
With SCART you gained the ability to send audio and video on separate channels, as well as daisy-chaining multiple devices and have the sending device convey the requested aspect ratio.
And finaly in HDMI you have the video and audio data in much higher definition, back channels so that for example your TV remote can control the Bluray player, chaining of devices, … Also, about half of the pins connect to just the opposite wire for a twisted pair which helps reduce noise and increase data rates (again so you can watch in 4K instead of 576i (PAL) / 480i (NTSC))
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