I have a simple, old SigmaTel audio card with the CXD9872RD chipset, and, although it's not the best sound card around - at the contrary, it's quite mediocre! - it does its job...
Try to do a test: capture audio from a DTS laserdisc, let's say a minute, then play the file with your DTS sound system: if it plays correctly, your audio card is able to capture DTS sound stream.