播放 vs 播送 vs 播音（近义词）

1)播放 can mean"to broadcast either through radio or through television",whereas 播送 only means"to broadcast through radio".播音 is a verb-object phrase meaning "to broadcast a program".In examples①and②below,either will do.
2)播送 can also mean"to broadcast a specific piece of news",but 播放 is rarely so used:
3)To broadcast a film,television play or other programs by television,播放 is usually used:
4)播音 can be expanded into phrases such as 播音员 (announcer),播音室 (broadcasting studio),播音时间 (broadcasting time),etc.and can be decomposed: