Every once in a while I notice these very HF insects in recordings -
they're often at 20,000 Hz and higher. When I resample them down to my
range and increase the volume, they sound like regular tree crickets.
They're often diurnal.
I've posted an example at
http://www.naturesongs.com/recordists/insect_hi_freq1.wav ( or
http://tinyurl.com/nd3y6). In this example, recorded in central Arizona
today at 11 am (86 deg.F), the first 3 sec. are "raw" - you can see the
sound up around 21,000 Hz, the next 3 sec are resampled 4X, and the final 3=
sec are the resampled portion boosted 20dB, so I can hear it.
The individual pulse rate is about 120 pulses/sec, so he's really humming!
What are these guys?
Doug
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Doug Von Gausig
Digitally Recorded Birds Sounds at:
http://naturesongs.com/birds.html
Clarkdale, Central Arizona, USA
e-mail:
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