Further analysis of spectral traits showed that excess attenuation values were mainly affected by minimum frequency and peak frequency, while blur ratio variation was predominantly affected by bandwidth, and signal-to-noise ratios were predicted by bandwidth and peak frequency.
Differentiating between vestpertilionid species was particularly difficult; we relied primarily on the minimum frequency and pulse duration [41] to assign species identifications.
In addition, the selected AUD calls had duration, DF, maximum frequency, minimum frequency and bandwidth within ±1 SD of the mean values of all the audible calls.
The majority of variation in the five variables that measured frequency (start frequency, end frequency, maximum frequency, minimum frequency, and frequency at maximum amplitude; see Figure 1c) was explained by PC1 (Table S1).
Identifications were made by inspecting individual pulses and pulse sequences for key features, primarily pulse shape and bandwidth, frequency of maximum energy (characteristic frequency for Anabat calls), terminal frequency, minimum frequency, and pulse duration.
The five variables that measured frequency (start frequency, end frequency, maximum frequency, minimum frequency, and frequency at maximum amplitude; see Figure 1c) were subjected to a Principal Component analysis to yield a single principal component frequency axis (PC1; details in Table S1).
We need to rely on measuring the difference between the maximum and the minimum frequencies and take their mean.
For tonal sounds we compiled information on the most used acoustic parameters: absolute and mean minimum frequency, absolute and mean maximum frequency, duration, and mean number of inflection points.
where which is known as the wavenumber and and and are the maximum and minimum frequency components of, and =.
The specific IYCF indicators investigated are minimum dietary diversity, minimum meal frequency and minimum acceptable diet.
Prevalence of minimum dietary diversity, minimum meal frequency and minimum acceptable diet was obtained by using descriptive statistics.
