For voice chat you mean? From the vg leaks info it is far more than would be necessary for that.
Here's a thing: Microsoft doesn't talk about these things all that much either.
The people I've seen talking about these things a lot seem to be fans with an eye on trying to find compensation for a perceived lack elsewhere.
For example, making mountains out of the '15 processors' stuff. Most of which are completely ordinary/unspectacular things with analogs in PS4.
That seems to have been a running theme with Xbox One tech speculation - making the extraordinary out of the ordinary. It started early, when we had people hyping up 'extra processors' which turned out to be generic sub elements of any standard GCN GPU. And here we are again, trumping up '15 processors'...many of which are exceptionally vanilla things that are typical on any such SoC.
Maybe Sony or Cerny doesn't do this so much because they feel the system is comfortably more powerful, without needing to enumerate over every little piece of silicon on the die.