void delta

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

## void delta | ## (EST_Track &tr, EST_Track &d, int regression_length = 3)

> Produce a set of delta coefficents for a track

## Documentation

> Produce a set of delta coefficents for a track

> The delta function is used to produce a set of coefficients which estimate the rate of change of a set of parameters. The output track <parameter>d<parameter> must be setup before hand, i.e. it must have the same number of frames and channels as <parameter>tr</parameter>.

Parameters:
  tr - : input track of base coefficients
  d - : output track of delta coefficients.
  regression_length - : number of previous frames on which delta estimation is calculated on.

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