Bat Echolocation Researc h - Bat Conservation International

A
The data extracted from the different analyses can be
used to assist in species identification. Obviously,
knowledge of the sound characteristics of different
species is required in order to accomplish this successfully.
FEATURE DETAILS
B
Automatic parameter calculation
To quickly process large files, an automatic parametercalculation
function is available. This enables important
signal parameters such as signal duration and minimum
and maximum frequencies, to be calculated (Fig. 5).
I emphasize that the results of any automatic-analysis
function must be interpreted with caution. The program
will not always make the same decisions that would be
obtained by manually analyzing signals. In order for the
user to obtain visual information about the results of the
analysis, it is possible to have the program mark the different
positions in the diagrams (pulse start/end time,
maximum/minimum frequency).
Automatic recording mode
In the automatic recording mode, the computer is
C
Figure 1: The oscillogram and spectrogram of ultrasonic signals with
severe interference from low-frequency noise (mainly human voices) also
present. Using a high-pass filter, the low-frequency noise can easily be
eliminated by filtering. A: Original signal; B: Filter settings; C: Filtered
signal.
mappings or designed freely by the user (Fig. 2).
A spectrogram, which is composed of a large number
of power spectra partially overlapping in time, allows
spectral changes over time to be studied. However,
sometimes it is valuable to view the power spectrum over
a specific time interval only. This function can be facilitated
using the Power Spectrum command (Fig. 3).
There are also a number of temporal analysis modes
in BatSound, e.g., to automatically calculate pulse length
(duration) and interpulse interval (Fig. 4).
Section 4: Resources, Research and Study
Figure 2: Different color mappings in a spectrogram (show in black and
white).
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