[H] AV receiver question

[DHSinclair]

My older Brother is now deep into a search for the "perfect" upgrade from 
his current analog TV to a (ATM) 42in hdtv.
He called last night and says he will not need to buy an AV receiver 
because his sales folk say that the AV reciever does zero video processing 
of an incoming singnal-it really only deals with audio. Is this true.   (He 
does use Comcast cable ATM.)

I thought an AV receiver did do some, maybe basic, video processing; 
perhaps limited only to "switching."
Thank you.
Duncan