Transmission/Technical Information

I want to know more about High Definition technology?

Firstly programmes need to be shot and made in HD and then they are played-out by us, to you, in High Definition.

It requires an entirely separate broadcast stream from standard definition (SD) broadcasting. It has a 16:9 aspect ratio, (“widescreen”) and in the UK it transmits at a picture size of 1920 pixels wide & 1080 pixels tall. In the UK, we call this format “1080i” (the “i” stands for interlaced). Channel 4 uses only this format, which has been adopted by all UK broadcasters. We use a newer transmission method to fit all the increased picture data into, so older set-top boxes that don’t say “HD” most likely won’t get the services.

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