Why does the pitch of American movies and TV shows go up slightly when it’s shown on British TV Channels?

Question

When I see shows from America being on air on a British TV channel (I watch on the BBC), I noticed that the sound of the films, music or in general, they go up by one. Why does that happen?

In: 7006

Answer 1

When shows are syndicated in the US, I noticed a higher pitch on some channels. This is because they speed up the show slightly to squeeze in more commercials.