Metric Halo SpectraFoo - Manual (Page 117)

Glossary
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20 40 60 80 100
20
40
60
80
100
Figure 184: A linear trace
Lissajous Named after Jules Antoine Lissajous, this type of display shows coherence
between two audio channels, and can be used to display stereo position and/
or phase problems.
Logarithmic A mathematic function where the input and output change at a non-constant
rate. For example, the faders on a mixer are logarithmic; they change the
signal level a large amount with a small movement toward the bottom, and
a small amount with a large movement toward the top.
4 6 8 10
2000
4000
6000
8000
10 000
12 000
Figure 185: A logarithmic trace
O
Octave The unit of spacing on the frequency scale, determined by the doubling of
frequency centers.
The common octave centers are 8, 16 31, 62, 125, 250, 500, 1 k, 2 k, 4 k,
8 k and 16kHz.
Ohm (Ω) Unit used in the measurement of resistance and impedance. Often used
with prefixes to indicate large values, such as “k” (kilo) which equals 1000;
for example, 5 kΩ means five thousand ohms (or 5 kilo ohms) . Similarly,
“M” (mega) is used to indicate 1,000,000; so 10 MΩ means 10 million ohms
(or 10 megaohms).
P
Peak The maximum energy of a signal.
Phase Describes the position of one sound wave relative to another, or in relation
to time. Let's look at phase between two signals. In the first example, the two
signals have the same phase: