There was less stress in his demeanor, more fun in his spirit, an occasional smile on his face.

Compared with the tension-filled news conference he had last week on the eve of Broncos training camp, Von Miller was more like himself when he addressed a smaller gathering of media Sunday.

"I've been under a microscope since I've been here," Miller said, referring to the expectations created when the former Texas A&M star was selected by the Broncos with the No. 2 pick in the 2011 draft. "With great power comes great responsibility. I understand that. I understand I've made mistakes. But the guy I was yesterday is not the guy I am today."

He quipped how he stole part of this profound statement from Uncle Ben of the "Spider-Man" movies. Miller is the Broncos' best defensive player, the NFL defensive rookie of the year in 2011, a dominant player with 18½ sacks in 2012 and a Pro Bowler both years.

He might start his third season serving a four-game suspension after the NFL found him in violation of its drug policy. Miller has appealed; he and his NFL Players Association lawyers will have a hearing about his case no later than mid-August.

"I've faced adversity before," he said. "In college I faced adversity, and the following season I led the nation in sacks. Everybody faces adversity. It's just how you handle it."

Miller was suspended during his sophomore season at Texas A&M by coach Mike Sherman for skipping classes and having a lackadaisical approach to football. Miller woke up by his junior year and led NCAA Division I pass rushers with 17 sacks.

The more recent controversy surrounding Miller also seems to have heightened his focus. He has played extremely well in training camp. Put it this way: Peyton Manning is lucky there's a no-touch rule on the Denver quarterbacks.

"I've always been a locker room guy," Miller said. "To get back in the locker room with all the guys, joking around, having fun out there, it's been great.

"I love playing football. I do a lot of things good, but this is what I do great. This has always been my safe haven."