Max File Length
The Data Recorder streams data to audio files. A single audio file will be limited to the length
specified, here, in hours, minutes, and seconds. Tap on the time to reveal a picker control with
which the maximum duration may be specified, up to 2 hours, 59 minutes, and 59 seconds. Tap on
the time again to hide the picker control.
Auto Start Triggering
Enable
Recording can be configured to automatically start after the source channel signal exceeds a
specific threshold. Use the Enable switch to turn this feature on or off. When this option is enabled,
pressing the record button will put the tool in 'Record' mode, although no data will be recorded
until a trigger event occurs. While the tool is in 'Record' mode, but before a trigger event has occured,
it will display 'Waiting for Trigger' in its status display (to the right of the Record/Stop and
Start/Pause buttons).
Source
Any available input or output channel may be selected as the source for the trigger. All recorded channels
will be simultaneously triggered from the source channel, regardless of which input and/or output channels
have been selected for recording.
Threshold
A trigger event occurs when the source channel signal exceeds some user-defined
threshold value, at which point recording will begin (including data that precedes the trigger event,
as specified by the pre-trigger delay). Specify the threshold value in the text box.
Pre-trigger Delay
The pre-trigger delay specifies how much of the raw time signal is to be preserved and included
in the recording prior to the trigger event.
You may specify a value between 0 and 100 ms.
File Options
Include Location
When this option is enabled, the latitude, longitude, and altitude at the time of the
measurement will be embedded within the audio file and included in optional info files (see
below). Horizontal and vertical accuracy (in meters) will also be included.
Audio File Format
Data can be saved in AIF, CAF, or WAV audio files.
Filename Suffix
To make sense of multiple files written in a single recording session, each file
can be assigned an auto-incremented numeric suffix (Counter) or a compact suffix indicating
the date and time the file was saved. The suffix will be appended to the end of the filename as
indicated in the Data Recorder's main display.
Save Info File
The Data Recorder embeds metadata within the audio file (chunkID: 'FHdr') including date, time,
location (if enabled), input channel details, and sensitivity calibration information. This
metadata can also be optionally saved to a separate info file for easy retrieval. The info file
will have the same name as the audio file.
Info File Format
The info file can be saved in CSV, TXT (tab-delimited), or MAT-file format.
Keep Recording
To allow the recording to continue after the maximum file length has been reached for the
current recording session, switch this option on. When one file is finished, another will be
recorded to, up to the File Limit described below. This option will only have an effect if the
File Limit is greater than 1.
File Limit
If the Keep Recording option is enabled and File Limit is greater than 1, the Data Recorder will
stream to a new audio file each time the current max file length is reached, until the file
limit is met. So, for example, if the maximum file length is 1 hour, Keep Recording is enabled,
and File Limit is 8, the Data Recorder, if allowed to run long enough, will capture 8 hours of
data which will be split into 8 audio files.