Are dolby digital and AC-3 the same?


I'm a bit confused by these 2 terms. I've heard about a difference in bit rates, but that's about all. I currently own a Harman Kardon AVR55 reciever, that does AC-3 decoding, and I would like to use it in my home theater setup. I would like to use the money saved to go out and get 2 additional amps for my system, since the receiver has pre-outs. Also, do most DVD movies come with DD and DTS, or just one of the 2?
julpay09f4

Showing 1 response by perfectimage

I thought that DD used data compresion and DTS rearanged the data to fit like a puzzle. Eliminating the need for compresion which degrades the signal.