Possible knocks and chatter at Burnt Rancherias Campground, Laguna Mountain witnessed in San Diego County, California

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My wife and I were camping in the Cleveland National Forest, Mount Laguna area. [East of San Diego] The campground is called Burnt Rancheria. It was exactly 3:14am. My wife woke me up because she needed to use the restroom really bad. The restroom was about 50 yards away and she was afraid to go alone. As I was putting on my shoes, I started hearing sounds that reminded me of an ax hitting wood (or a tree), but louder. It wasn't like someone was cutting wood, because the sounds were not in rapid succession, they were 2 or 3 seconds apart. In total I think I heard 4 or 5 of them. I put on my shoes, stepped out of my tent, and kept hearing them, finally realizing that they sounded like the 'knocking sounds' described by people who have reported bigfoot encounters. After about 5 seconds they stopped, and (I don't know if this was just my imagination or not) I started to hear echoes of 'voices'. I say voices because it sounded like someone talking but at the same time it was gibber...