How did Christian Bale create Dickie's speech in "The Fighter" (2011)?

It's wonderful to watch a great actor like Christian Bale transform from his Bruce Wayne / Batman character to Dickie, who exists on a completely different spectrum. Here's the secret behind the accent.

“I approached Dickie’s accent as though Dickie’s got his own thing going on. He calls it Dickinese himself. And I think everyone will agree, I really had to tone down his natural rhythm and voice because I understand him completely now because my ear is with it, but if I’d done it exactly like Dickie, we would have needed subtitles.” More

Source: Collider.com