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Glossary
Glossary–2
WFM 601A, WFM 601E & WFM 601M User Manual
Diamond Display
A simplified vector display for RGB signals that defines the valid gamut
limits in the form of two diamonds.
Distortion
See harmonic distortion.
EDH
Error detection and handling. Supports the standard SMPTE RP-165, which
proposes a technique for recognizing inaccuracies in the serial digital signal.
Frame
Contains all the information required for a complete picture. For interlaced
scan systems, there are two fields in a frame.
Gamma
A measure that compares the contrast in the original and reproduced
television picture. Since picture monitors have a nonlinear relationship
between the input voltage and brightness, the signal must be correspondingly
enhanced to nullify the nonlinear distortion. Gamma correction is always
done at the source (camera) in television systems: the R, G, and B signals are
converted to R
1
/
V
, G
1
/
V
, and B
1
/
V
. Values of about 2.2 are typically used for
gamma.
Gamut
See Color Gamut.
GBR
See RGB.
Graticule
The scale which is used to quantify the displayed signal on a waveform
monitor or vectorscope. Graticules may either be screened onto the faceplate
of the CRT (internal graticule), or onto a piece of glass or plastic that fits in
front of the CRT (external graticule). They can be electronically generated.
Harmonic Distortion
Signal distortion caused by non-linearities in a system. System non-lineari-
ties produce multiples of a single frequency signal applied to the the system.
Harmonic distortion is evident when a pure sine wave applied to a system
produces harmonic content at multiples of the sine wave frequency at the
output.
Hue
The property of color that allows us to distinguish between colors such as
red, yellow, purple, etc.
Lightning Display
A display, for use with SMPTE specified color difference signals (Y, P
B
, P
R
),
that plots the two color difference signals against luminance to create a
display similar in appearance to a lightning bolt.