Internal soundgen function.
findBursts(
ampl,
step,
windowLength,
interburst,
burstThres,
peakToTrough,
troughLocation = "either",
scale = c("dB", "linear")[2]
)Returns a dataframe with timing of bursts
downsampled amplitude envelope
time difference between two points in the envelope (ms)
length of FFT window, ms (multiple values in a vector produce a multi-resolution spectrogram)
minimum time between two consecutive bursts (ms). Defaults
to the average detected (syllable + pause) / 2
to qualify as a burst, a local maximum has to be at least
peakToTrough dB above the left and/or right local trough(s)
(controlled by troughLocation) over the analysis window (controlled
by interburst). Defaults to SNR + 3 dB
should local maxima be compared to the trough on the left and/or right of it? Values: 'left', 'right', 'both', 'either'
maximum possible amplitude of input used for normalization of
input vector (only needed if x is a numeric vector)
Called by segment.