Cable Box Digital 5.1 converted to Digital Stereo

The cable company broadcasts quite a few all music channels and I would like to play that digital output into my Dac.

But, it seems the digital output is only in 5.1 and won't work with my Dac.
Is there any device that can decode (convert)the 5.1 Digital to a 2.0 Digital?
Yeah, I can use the Cable analog outputs, but I thought with a digital output through my Dac I could obtain better sound.
I'll check with Comcast about the Xfinity one box. However, past experience tells me that will be a hassle getting through to someone that's knowledgable.
Ozzy, on the Xfinity box you need to go to the menu and select 2 channel audio (PCM). Run an optical cable from the Xfinity box to your PS Audio DA converter - less jitter with the optical. I run this way through my Oppo BD-105 with good results. Some of the cable Paladia concerts are really nice. You may decide to stay with 2 channel after you do this. Good luck
8snaces, Thanks, I believe I have already tried it and there was no change. But, I'll try it again. Thanks.
I did this before with TW Music Choice, it does not improve quality to any degree worth worrying about.