Would you be willing to answer a few brief questions about PlayStation Forums?
I'm not using voice chat but sometimes during play someone else voice conversation will brake in is there anyway to block this
That would have to be done with the in-game chat controls. Most games provide a way to mute a specific player, but generally not to disable all chat if you have the hardware to hear it. You should ask in the DCUO forum, which is on the SOE web site.