Metric Halo SpectraFoo - Manual (Page 119)

Glossary
119
Figure 188: Phase cancellation
Pink Noise Random noise that has been run through a “pinking filter” and exhibits equal
power per octave in all frequencies. Commonly used to test the frequency
response of devices and audio reproduction systems.
PPM Peak Programme Meter
Also called a Peak meter, this type of meter shows instantaneous signal ac-
tivity.
R
RMS Root Mean Square
Describes the average energy of a signal.
S
Signal to noise ratio The measurement of how much a signal has been corrupted by noise.
SUT System Under Test
Term referring to a complete audio reproduction system to be tested, for
example a PA.
T
THD Total Harmonic Distortion
The measurement of all distortion components of a signal.
V
VU Volume Unit