Microsoft has done a deal of work to make the voice chat in the forthcoming Xbox One. Well, it certainly did a deal. It bought Skype and that's helped as you can hear below.
Some has told Major Nelson (real name Sir Larrance of Hyrbshire Jr III*) to tell us that: "Thanks to integration with Skype’s audio codec, which has a proven track record of high-quality voice through billions of hours of use within Skype, as well as dedicated audio processing (for Xbox One conversations via Skype and multiplayer party chats), Xbox One offers higher quality voice chat with the Xbox One Chat Headset compared to Xbox 360—whether you’re chatting in-game or through party chat with Skype on Xbox One.
"But the improvements don’t stop there. The Xbox One Wireless Controller’s new expansion port dramatically expands the data transfer rate between the controller and console. Combined with Skype’s audio codec, this enables crystal-clear digital audio with the Xbox One Chat Headset, both capturing and rendering speech at 24 KHz PCM, which is triple the rendering sample rate and a 50 percent capture rate improvement over Xbox 360 headsets. And, as we shared before, the Xbox One Chat Headset comes with every Xbox One console."
Source: Microsoft* Not his real name