There are some excellent Dolby licensed decoders available for home use, however these tend to be rather expensive. The unit presented here is a "sound-alike" circuit which, whilst not preforming as well as the real thing, still gives superb results for a more affordable price. The only other requirements are a small amplifier and a pair of cheap speakers.
http://www.web-ee.com/Electronic-Projects/projects/surround1/index.htm