The Von Neumann extractor mentioned in the article is interesting.
There are other approaches too. I once implemented an algorithm to remove unknown bias from a bitstream in a streaming fashion. According to the paper I used their result was theoretically optimal. Check it out:
https://github.com/tdons/deskew-bernoulli
There are other approaches too. I once implemented an algorithm to remove unknown bias from a bitstream in a streaming fashion. According to the paper I used their result was theoretically optimal. Check it out: https://github.com/tdons/deskew-bernoulli