Hey Everyone.. 
This is my first post here so first of all, Hi ALL!  
My question is, in most recordings i hear there's a vocal effect that makes the vocalist sound like he's speaking through a radio or similar equipment. 
For example. The band Muse use that effect a lot. And Metallica used it in the song No Leaf Clover (youtube link : 
 
) At the chorus part (1:58-2:10). How is that done?? What is it called? It helps alot with mediocre vocalists such as myself to be "hidden" behind that kind of effect. I am not looking to hide my flaws just sound decent with my recordings. Plus it's a very cool effect. 
Thanks in advance for your help =)