Metric Halo SpectraFoo Version 1.5 - Manual (Page 14)

Lissajous Phase Scope (vector mode) Lissajous Phase Scope (X-Y mode)
The Lissajous Phase Scope is equivalent to an oscilloscope running in either vectorscope or X–Y mode (You can
switch the mode by –clicking the instrument). It shows you the amplitude of the first input signal versus the
amplitude of the second input channel signal. This instantly lets you know if a mix has polarity problems. It also
allows you to see the width of the stereo field of the material being monitored. When the scope is in vector mode,
in-phase material appears as a vertical line while out of phase material appears horizontal. When the scope is in X–Y
mode and the activity of the trace occurs mostly in the lower left and upper right quadrants of the display (as pic-
tured) the left and right channels are predominantly in polarity. When the activity of the trace occurs mostly in the
lower right and upper left quadrants of the display, the left and right channels are predominantly out of polarity (com-
monly referred to as out-of-phase, or mono-incompatible).
Phase Torch™
This is a revolutionary new tool which compares the phase difference between two channels as a function of fre-
quency, independent of power. The display looks like a multicolored fountain or torch. The graphing scheme is a
polar pattern. The radius from the center is determined by the frequency and the angle is determined by the phase
difference between the left and right channels. The center of the graph represents DC while the outer radius repre-
sents 22 kHz .
In phase Out of Polarity Inter-channel delay
Nulls in the Comb Filter
SpectraFoo Operation Guide 13