ch 2: rework NTSC sentence

[pronoiac]

It felt clunky and hard to read.

[fabiensanglard]

This rework now has a repetition of "in" which is not the most pleasant to read. Can we avoid this?

[pronoiac]

I agree. Let's see, the original:

This is a technique used for TV broadcasts, such as in the NTSC standard in USA and Japan.

How about:

This is a technique used for TV broadcasts, for which the USA and Japan used the NTSC standard.

[fabiensanglard]

That sounds better!