Soft dB Tenor 24bits Data User Guide - Manual (Page 49)

Tenor Data Logger Soft dB inc.
5.4 Signal Extraction Tab
The signal extraction tab includes a function for extracting a portion of the signal. This
feature is very useful for analyzing a portion of the wave file and for removing the
beginning of a wave file after a filtering operation. Also, a saturated portion of the signal
can be excluded for better analysis.
The extraction can be cancelled at any time, and the entire framework of the original wave
file will be recovered. The extraction technique is based on the use of file pointers. This
means that the start and end-points of the selected framework are sample numbers in the
wave file. This way, the original wave file is never changed and an Undo operation is
always available.
When an extraction has been done using the Extract between cursors function, all
functions and modules of the post-processing interface will work with the new start and
end-points of the framework. The save .wav function will also take into account the starting
point and the ending points. After saving for instance, the new wave file will contain only
the selected portion of the signal of the original wave file.
Here is the detail of the extraction functions:
Function Description
This function changes the start and end-points of the
framework following the blue and green cursor
positions on the peak value. The start and end points
are changed for all channels. Use the Undo Extraction
function to cancel the extraction.
This function cancels the extraction(s) and resets the
start point to zero and the end point to the end of the
wave file. For multiple extractions, the undo operation
always retrieves the entire wave file signal and not the
preceding selection.
User Manual p. 49