Vocoder or Autotune

hello everybody
i need an information about voice treatment on Cher's songs
people says that is autotune and someone else vocoder
i've try doing same thing with autotune and no result
so where is the thrues !!!!!!!
if you have the real information i'll be happy to learn it
thanks :s:

 

http://www.sospubs.co.uk/sos/feb99/articles/tracks661.htm

 

God that stuff was funny when they mocked it on south park. n/t