3
More details
3.1
Data Files
Downloads produce several types of files:
o
‘sud’ files which are the raw downloaded file. This is a compressed file and therefore
ideal for storing or sending of complete recordings. It can then be decompressed at
a later time into the following constituent file formats.
o
‘wav’ files containing the audio. This is a Microsoft WAV format file that can be
opened by any media player, matlab, raven etc.
o
‘xml’ files which c
ontain metadata such as date recorded, gain setting, etc.
o
‘csv’ files containing ancillary sensor data (e.g. temperature)
All file types follow the same naming convention consisting of the device serial number followed by
the date and time of the start of the recording in the format YYMMDDHHMMSS.
For duty cycled recording there will usually be one file per recording period. For continuous
recording a maximum file length of 1036800000 samples (2GB of wav) will determine the length of
the files. This equates to 1 hour recordings for a 288khz sample rate.
Where smaller than 2G files are desired for continuous recording it is recommended to set a duty
cycle with ‘zero off time’. For example, a duty cycle of 30 minutes every 30 minutes will result in
continuous 30 minutes files with no missing samples between files.
3.2
Battery charging
SoundTrap uses an internal rechargeable Lithium ion battery. The battery is recharged by plugging
the SoundTrap into a computer’s USB port, or other USB power supply. Look for the blue LED
indicator to confirm that the battery is charging. Once the charging cycle completes the blue
indicator will extinguish. Charging time for ST202 (STD or HF) is approximately 8 hours for a
completely discharged battery. Some additional notes about battery charging:
•
The battery will charge while data is being offloaded over the USB.
•
The charge level reported by the SoundTrap Host software (in percentage and voltage
terms) is only accurate to within approximately 10%. Determination of whether the battery
is fully changed should be by observation of the blue LED indicator, NOT the approximation
given by the Host software.
