X-Y Plot - MOTU 828 Mk III Hybrid User Manual

X-Y PLOT

The X-Y Plot window (Figure 9-43) 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 9-43,
below). 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:
Figure 9-43: X-Y Plot
C U E M I X F X
Situation Meter level X-Y Plot graph
Perfect correla- +1
tion
Zero correlation 0
Perfectly out of -1
phase
Opening the X-Y Plot
Each 828mk3 interface has its own X-Y Plot
window. Choose the X-Y Plot item from the
Devices menu under the desired interface.
Choosing a channel pair to display
The X-Y Plot follows the currently focused audio
input or output. If you focus a mono channel (e.g.
Analog 3), its corresponding stereo pair will be
displayed (Analog 3–4).
Mathematical
relationship
Diagonal line y = x
going from
lower left to
upper right:
No discern- None
ible pattern
Diagonal line y = -x
going from
upper left to
lower right:
101