Re: Determining peak frequencies

["Raimund" animalsounds]

> In other case, I do not see how the peak frequency was determined. E.g., in 
> the second species, Arethaea phalangium, the peak is listed at 15kHz, but I 
> don't see how you would conclude this from the spectrogram.

Hi Alan, 

Indeed, the peak frequency measure might not be well suited for describing 
species that produce broad-band frequency spectra that lack a single distinct 
peak. 

In these cases, other spectral parameters such as quartiles (the 50% quartile 
represents the center of gravity) or minimum and maximum frequencies (relative 
to the peak amplitude) might be more appropriate. 

See the following .pdf file for an Avisoft-SASLab Lite analysis example on the 
(European) Large Marsh Grasshopper 
(http://www.avisoft.com/sounds/Stethophyma_grossum.wav):

http://www.avisoft.com/scratch/powerspectra.pdf

Regards,
Raimund