2 Overview
2.1 General
The BATLOGGER is a data logger, which records ultrasound vocalisations of bats in real-time, and stores them for
later processing on a SD / SDHC memory card.
The logger performs a real-time recording to internal RAM and subsequently stores the recordings, that fulfil certain
criteria, as sound data (sequences of echolocation calls) onto SD / SDHC card.
Apart from the bat calls, which are stored as WAVE files, additional information is written in text format into a “.xml”
file, which stores all the settings of the BATLOGGER at the time of recording, including time, date and location of
the recording (GPS data), and the temperature of the logger.
To allow a later overview over all deployments of the BATLOGGER, its operating state is being written to a “LOG”
file on the SD card.
2.2 Device variants
The BATLOGGER is offered in a slightly extended version since the end of 2012 (Model: BATLOGGER M). It
additionally includes an integrated mixer for live monitoring of the bat calls during recording. BATLOGGER M has
speaker holes on the top, 3-line display and has Part #: 212.013 on the nameplate.
BATLOGGER M
Part #: 212.013
BATLOGGER
Part #: 212.003
3-line display
2-line display
Speaker LED charge indicator lights
red: charging
green: charged
2.3 Data storage
The audio files are stored on memory card as #****.wav files (where # = 4 digit serial number of the logger), with
consecutive numbering (****). For every #****.wav file, an #****.xml file is stored, which contains all parameter
settings, date, time, geographic position and temperature at the time of recording of the corresponding WAVE file.
Ultrasound data of the microphone are first written to the internal Random Access Memory (RAM) of the
BATLOGGER. After termination of a single recording sequences (Recording...), the data are stored automatically
from RAM to the SD card (Saving... #****.wav). During this storage time (duration depends on file size and card
type) ), the BATLOGGER is blocked.
2.4 Recording
The BATLOGGER can be operated in different ways. As a basic principle, when the logger is in ”Record” mode, the
signal from the microphone is constantly written to internal RAM (Sampling...).
If the logger is set for continuous recording, the RAM is filled with data and thereafter data are written to the
memory card. As the loggers RAM is limited to 32 MB, the length of a single recording sequence can not exceed
approx. 53 seconds, but can be set to less. Subsequently this recording sequence will be written as #****.wav file to
the SD card and a new recording will start, thereby overwriting data in RAM. The time required for data storage to
the memory card is largely depending on the file size but also on the type of card. In general the writing of the file
BATLOGGER Manual Elekon AG Nov. 2012 4/28
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