Click and pop removal using an autoregressive model (AR) and sinusoid + AR model.
A paper outlining the implementation is available here: http://www.music.mcgill.ca/~greg/courses/MUMT605/MUMT605finalpaper.pdf
An implementation of algorithms from the book: S. J. Godsill and P. J. W. Rayner, Digital Audio Restoration - A Statistical Model-Based Approach. London, UK: Springer-Verlag, September 1998.