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Avisoft-SASLab Pro Tutorial
There are
several ways to measure sound parameters from the spectrogram:
Cursors There are different
cursor modes which may be activated from Tools/Cursors/…
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The ‘Standard marker cursor’
allows to measure duration’s by left-clicking and dragging.
The associated values are displayed at the right top corner of
the spectrogram window. The current duration value can
be exported as an ASCII string by File/Data export/Copy
measured value or Copy t1, t1. Alternatively simply click at
the top right cursor value frame. The ASCII string is copied
into the clipboard and can be pasted from other
applications.
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Additionally, the single values
can be automatically transferred into an Excel spread sheet.
This can be configured from File/Data export/’DDE- Parameters
/ Log file…’
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In the ‘Standard marker cursor’
mode an additional frequency cursor can be activated by
clicking at the area between left windows margin and frequency
axis and dragging it to the right (or by Tools/Cursors/’Insert
bound frequency cursor’). This cursor moves along the peak
frequency.
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Another cursor available in the
‘Standard marker cursor’ is the frequency cursor which can be
activated from Tools/Cursors/’Insert frequency cursor’ or by
clicking at the area above the spectrogram display and
dragging the cursor down into the spectrogram. This cursor can
be moved freely for precise frequency
measurements. |
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A similar cursor for measuring
harmonic frequency structures is available form
Tools/Cursors/’Insert harmonic frequency cursor’ or by
>pressing the shift key and clicking at the area above the
spectrogram display and dragging the cursor down into the
spectrogram. |
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The ‘Free reticule cursor’ is a
thread cross cursor replacing the mouse cursor. In this mode
time, frequency and amplitude can be measured. Left-clicking
will export the current values. The ‘Bound reticule cursor’ is the same, except that the frequency thread
moves along the peak frequency (the current vertical mouse
cursor position is ignored). |
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The ‘Magic reticule cursor’ allows to
track frequency contours in complex (harmonic) sounds. With
the option “locate and measure entire elements” activated,
several sound parameters as duration, max/min and start/end
frequency can be measured quickly by placing the mouse cursor
over the element to be analysed. |
Labels
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Labels can be placed anywhere on the
spectrogram. A short label text can be annotated to either a
single point at a certain time/frequency location or to a time
section (section label). Single point labels are annotated
from Tools/Labels/’Insert labels’. Alternatively, this can be
made by right –clicking and selecting the associated popup
menu item. |
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The coordinates of these labels can
then be exported from Tools/Labels/’Label settings…’ by
the button ‘Copy’. This will copy the selected labels as an
ASCII table into the clipboard, which can subsequently be
pasted into an Excel spread sheet for
instance. |
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Section labels can be used to create
a specific grid for logging data at regular intervals with the
‘Free reticule cursor’. The cursor then snaps automatically
into the temporal grid. This grid option can be activated from
Tools/Labels/’Section labels grid…’ This may be especially
useful for signals where automatic methods are not
possible. |
In order to enable
comparisons between different sound files, the measurement cursors
of several program instances can be linked together. For this
purpose, several instances of the SASLab Pro software can be
operated at the same time (e.g. by the command File/New Instance).
The dialog Tools/Cursors/"Cursor linkage between Instances..."
allows to activate this cursor linkage option. When the desired
dialog items are selected and several instances of SASLab Pro are
running, the corresponding cursors will move simultaneously in all
instances, where the linkage option has been activated. (see an
example screen shot) | |