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WFM 601A, WFM 601E & WFM 601M User Manual
Glossary–1
Glossary
Accuracy
The closeness of the indicated value to the true value.
Bandwidth
The range of frequencies over which signal amplitude remains constant
(within some limit) as it is passed through a system.
Baseband
Refers to the composite video signal as it exists before modulating the
picture carrier. Composite video distributed throughout a studio and used for
recording is at baseband.
Bowtie Display
A display used to assess relative timing and gain through a three-channel
component system.
Color Difference Signals
Signals used by color television systems to convey color information in such
a way that the signals go to zero when there is no color in the picture. R–Y,
B–Y, I, and Q are all color difference signals for the NTSC system; U and V
are color difference signals for the PAL system. The component system color
difference signal are Y, P
B
, P
R
as specified by SMPTE and CCIR standards.
Color Gamut
The area between minimum and maximum reproducible limits for elements
of the color difference or RGB signals.
Component Video
Video which exists in the form of three separate signals, all of which are
required in order to completely specify the color picture. For example, R, G,
and B; or Y, R–Y, and B–Y.
Composite Video
A single video signal containing all of the necessary information to repro-
duce a color picture. Created by adding quadrature amplitude modulated
R–Y and B–Y to the luminance signal for NTSC systems or U and V to the
luminance signal for PAL systems.
CRC
Cyclic Redundancy Code. A series of transmitted bits used to enhance the
error detection capabilites of a system.
dB (Decibel)
A logarithmic unit used to describe signal ratios. For voltages, dB = 20 Log
10
(V
1
/V
2
).