It could be a silly answer,
but are you sure it is not an electrical disturbance in the recorder
or from something else?
I recently recorded very interesting HF sounds from my TFT computer
moniter up to 88 kHz (I was surprised the microphone (DPA 4061)
captured that).
--- In Doug Von Gausig <>
wrote:
>
> 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
> ***************************************
> Doug Von Gausig
> Digitally Recorded Birds Sounds at:
> http://naturesongs.com/birds.html
> Clarkdale, Central Arizona, USA
> e-mail:
> ***************************************
>
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