[PD] signal weighted median filtering

[Charles Henry]

Hi, list,
  I've created an abstraction for performing weighted median filtering
on a signal using 5 coefficients.  It's a real cpu hog.  It uses
heavily the expr, expr~ and fexpr~ externals, which leads to some
redundant calculations on each sample.
  The test patch enclosed shows how effective this can be for removing
impulsive noises from a signal (like the pops on a record).

Chuck
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