Normalized Difference Soundscape Index (NDSI) from REAL and Kasten, et al. 2012. The NDSI seeks to "estimate the level of anthropogenic disturbance on the soundscape by computing the ratio of human-generated (anthrophony) to biological (biophony) acoustic components found in field collected sound samples" (Kasten, et al. 2012).
Usage
ndsi(
wave,
w.len = 512,
anthro.min = 1000,
anthro.max = 2000,
bio.min = 2000,
bio.max = 11000,
rm.offset = TRUE
)Arguments
- wave
an object of class Wave imported with the readWave function of the tuneR package.
- w.len
numeric. The window length for the FFT (sampling rate / frequency resolution).
- anthro.min
minimum value of the range of frequencies of the anthrophony.
- anthro.max
maximum value of the range of frequencies of the anthrophony.
- bio.min
minimum value of the range of frequencies of the biophony.
- bio.max
maximum value of the range of frequencies of the biophony.
- rm.offset
logical. Whether to remove the DC offset.