Dolby Digital 5.1 on CD

I’ve always wondered why there wasn’t a hybrid system of DVD-audio, but on a plain old CD. Actualy Dolby Digital 5.1 audio-only recordings on a CD format. I know it works as the recent tests with a Dark Side of the Moon bootleg, remixed into DD 5.1 were exactly that.
The downside is that it can only be played on a “DVD” type player – with a 5.1 amp – that understands/decodes the format. I tried to play it on a portable CD player and it literally played the 0’s and 1’s as white noise hiss!!