Not a Kalman filter, but rather a Viterbi decoder -- a type of error-correcting code. https://en.wikipedia.org/wiki/Viterbi_decoder https://en.wikipedia.org/wi

Not a Kalman filter, but rather a Viterbi decoder -- a type of error-correcting code. https://en.wikipedia.org/wiki/Viterbi_decoder https://en.wikipedia.org/wiki/Viterbi_decoder From lurking on HN, I read that the whole field of ECC's is infested with patents. There's even an example on here of a specific startup (allegedly) destroyed by an ECC patent: http://news.ycombinator.com/item?id=3432322 http://news.ycombinator.com/item?id=3432322