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MOTU AUDIO TOOLS
91
X-Y PLOT
The X-Y Plot window (Figure 10-13) graphs the
amplitude of a stereo audio signal on a two-
dimensional grid.
For each unit of time (i.e., each sample), the
amplitude of the left channel is displayed on the
x-axis and the amplitude of the right channel is
displayed on the y-axis. A thick white vertical line
marks where left channel amplitude equals zero; a
thick white horizontal line marks where right
channel amplitude equals zero (Figure 10-13).
There are also thick white diagonal lines for y = x
and
y = -x.
Metering
Level meters are displayed above and to the right
of the graph for the left (green) and right (red)
channels, respectively. An additional Correlation
meter (blue) is displayed on the right. This meter
displays the correlation between the two channels.
The higher the meter, the higher the correlation
between the two channels. Below are a few
examples:
View controls
The View controls (Figure 10-14) provide several
options for the X-Y Plot display.
Figure 10-13: X-Y Plot.
Situation Meter level X-Y Plot graph
Mathematical
relationship
Perfect correlation +1 Diagonal line
going from lower
left to upper right:
y = x
Zero correlation 0 No discernible
pattern
None
Perfectly out of phase-1 Diagonal line
going from upper
left to lower right:
y = -x
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