> Was there any filtering done on your recordings? They certainly sound
> crystal clear!
Martin,
Yes, I have applied a simple and relatively steep 750 Hz high-pass filter
(or 7.5 kHz expressed in the original ultrasonic domain) in order to remove=
any
potential low-frequency noise. Other bat detector brands are already
equipped with an integrated and fixed analog high-pass filter. Generally, a=
ny
signals below about 10 kHz are usually out of interest to bat researchers.=
In my recordings, the signal components above the 7.5 kHz high-pass cutoff
frequency have not been further filtered (no FFT noise gate or something
similar has been applied).=20
The main reason for the crystal clear sound is the increased bit-depth of
the AD converter. Unlike other time-expansion detectors that have only 8 bi=
ts,
the UltraSoundGate devices provides a 16 bit dynamic range.
Regards,
Raimund
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