![]() The slope of this line will generally be negative because the background amplitudes get weaker for higher quefrencies. We can model it with a straight line as was done in Hillenbrand et al. If you choose the "Least squares" fit method then it matters more.ĭefines how to model the cepstrum background. In our analysis this value is not so critical if we use the robust fitting procedure. (1994) article was chosen as 0.001 s in order to reduce the effect of very low quefrency data on the straight line fit. The lower value for this range in the Hillenbrand et al. The quefrency range for which the amplitudes (in dB) will be modelled by a straight line. A pitchCeiling of 300 Hz will correspond to a lower quefrency of 1/300≈0.0033 seconds.ĭetermines how the amplitude and position of a peak are determined. The lower quefrency is determined as 1 / pitchCeiling and this value is in general more critical than the value of the upper quefrency which equals 1 / pitchFloor. The CPP measure represents how far the cepstral peak emerges from the cepstrum background.ĭetermine the limits of the quefrency range where a peak is searched for. The CPP measure is the difference in amplitude between the cepstral peak and the corresponding value on the trend line that is directly below the peak (i.e., the predicted magnitude for the quefrency at the cepstral peak). Calculates the cepstral peak prominence measure (CPP) as defined by Hillenbrand et al.
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