Alan,
I can't fully answer your question but would comment that 1. crickets
mostly have lower pitched calls of a more obvious frequency and 2.
that katydids really require a higher sample rate when recording
them, so that you can see the maximum range of their sound output,
and katydid calls do tend to spread right across the sound spectrum.
I'll be interested to hear input from others on this question.
Vicki Powys
Australia
On 20/11/2012, at 6:44 AM, symmerista wrote:
> Greetings,
>
> My Field Biology class and I have been recording unknown birds and
> insects, as well as developing libraries of known local species and
> "sound keys" to help them identify their unknowns. We use Raven
> Lite to visualize the sound files. For crickets and katydids, we
> often see "peak frequencies" in the species descriptions. We were
> hoping to be able to use peak frequencies in our keys, but now I'm
> not so sure that will work.
>
> For some species, the published peak frequency clearly matches up
> with the spectrogram of the corresponding call (e.g., 3.4 kHz in
> Neoxabea bipunctata on this page: www.bio.georgiasouthern.edu/bio-
> home/harvey/peakfreq.html - I don't yet know how to post images
> more directly to the group!).
>
> 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.
>
> Can anyone provide some insights here?
>
> Thanks!
>
> Alan
>
>
>
>
>
> ------------------------------------
>
> "While a picture is worth a thousand words, a
> sound is worth a thousand pictures." R. Murray Schafer via Bernie
> Krause.
>
> Yahoo! Groups Links
>
>
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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