How does composite or coaxial use just one wire while HDMI or SCART need a ton on them
In: Technology
The signal sent over composite or coax is the same one used for analog TV transmission in the old days. Remember what the quality was like?
You actually have two wires in composite or coax, the outer one is shaped as a circle around the inner one. These are radio waves and that’s how you send radio waves with minimum interference and without letting them leak out of the cable.
Nowadays it’s digital, at super duper high resolutions and framerates and still crystal clear. The shape of the cable is less important, so we can pack more wires in to get even more pixels across.
As for SCART, all the wires have separate functions. There’s stuff like audio in AND out, both left and right, that’s 4 wires already. Composite AND RGB video with a separate shield for each – that’s 8 pins. One of them even carries the video signal the TV is receiving from its antenna, so you don’t need a separate antenna system if you have some kind of encrypted pay service.
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