void neg_zero_cross_pick

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

## void neg_zero_cross_pick | ## (EST_Wave &lx, EST_Track &pm)

> Find times where waveform cross zero axis in negative direction.

## Documentation

> Find times where waveform cross zero axis in negative direction.

Parameters:
  sig - waveform
  pm - pitchmark track which stores time positions of negative crossings

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