void post_emphasis

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

## void post_emphasis | ## (EST_Wave &sig, EST_Wave &out, float a=DEFAULT_PRE_EMPH_FACTOR)

> Post-emphasis filtering.

## Documentation

> Post-emphasis filtering. This performs simple low pass filtering with a one tap filter of value a. Normal values of a range between 0.95 and 0.99. The same values of `a` should be used when pre- and post-emphasizing the same signal.

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