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Author SHA1 Message Date
Laurence Withers
bc383a92da iir_filter_copy(): don't copy uninitialised state 
If iir_filter_copy() was called on a filter which had no state, it would copy
the uninitialised memory from that filter. Check for this.
 2011-04-15 17:56:48 +00:00
Laurence Withers
9a87889dd3 Improve initial conditions 
Compute the DC gain of the filter (assuming 0 if unstable) and use that to
set the initial conditions of a filter as follows:
  x(t<0)=x(0)
  y(t<0)=x(0) × dc_gain
 2011-04-15 17:53:44 +00:00
Laurence Withers
2031d084cc Bump version 2010-11-08 15:18:39 +00:00
Laurence Withers
ce36ca9ef5 Import initial work 2010-11-08 15:18:07 +00:00