Listen to my filtered version of Doug's recording and tell me if you
still think it's an insect:
http://ad2004.hku.nl/naturesound/David_Ellsworth/insect_hi_freq1.filtered.w=
av
I converted a graph of the locally-averaged amplitude of the original
recording into a waveform, and made every other pulse negative.
For comparison, here's the same filtering done on the recording of
the Roesel's bush-cricket:
http://ad2004.hku.nl/naturesound/David_Ellsworth/metr_roe_.filtered.wav
There was no odd-even pattern here, and there wasn't enough
dilineation between pulses to make every other pulse negative. If you
want a pure comparison:
http://ad2004.hku.nl/naturesound/David_Ellsworth/insect_hi_freq1.filtered2.=
wav
(I suggest looking at the waveform of this one)
(Thanks for the upload space, Anton!)
At 2007-06-08 00:25, Raimund Specht wrote:
>I believe that it is a bush-cricket species. Unfortunately, I'm not an
>expert in North American insects. However, there are similar species
>here in Europe. For instance Roesel's bush-cricket (Metrioptera roeselii):
>
><http://www.avisoft.com/sounds/metr_roe_.wav>http://www.avisoft.com/sounds=
/metr_roe_.wav
>
>(original speed, re-sampled at 44.1 kHz)
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