void FIRlowpass_double_filter

In file ../include/sigpr/EST_filter.h:

## void FIRlowpass_double_filter | ## (EST_Wave &sigin, int freq, int order=DEFAULT_FILTER_ORDER)

> Quick function for one-off zero phase high pass filtering.

## Documentation

> Quick function for one-off zero phase high pass filtering.

> Normal high pass filtering (FIRhighpass_filter) introduces a time delay. This function filters the signal twice, first forward and then backwards, which ensures a zero phase lag. Hence the order parameter need only be half what it is for (FIRhighpass_filter to achieve the same effect.

Parameters:
  in_sig - input waveform, which will be overwritten
  - freq cutoff frequency in Hertz
  order - number of filter coefficients, eg. 99
See Also:
  FIRlowpass_filter

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Copyright University of Edinburgh 1997
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