Norsonic Nor848, Инструкция по эксплуатации

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14 Norsonic Nor848
Instruction Manual
Acoustic eraser
Sometimes sources may be closely spaced apart, or a
strong noise source in the area of interest is interfering with
the recording and impairing the image quality. Often this
will be seen as either a single large source, or the source of
interest will be completely shadowed by the stronger source.
Seen in the image below is a situation where two equally
strong sources are positioned close to one another., where
the resulting image will display a single large source. In such
situations the acoustic eraser feature may prove valuable.
The acoustic eraser is found via the “suppress point in
plot” button. This function will add a red circle to the screen
that can be dragged to any point, and remove the source
from that point. This is highly effective when several noise
sources are present.
The acoustic eraser is only available when wideband fre-
quency mode is used, and not for single frequency mode.
As seen on the pictures on the opposite page the acoustic
eraser completely removes the source where the sup-
press point button is positioned. The virtual microphone
can further be positioned on the source of interest. The
acoustic eraser can be used both in live view mode and
in post-processing.
The acoustic eraser is enabled
by pressing the suppress point
in plot buttonm
Frequency band mode must
be enabled to use the acoustic
eraser