Tektronix 1740A/1750A - Manual (Page 130)

1740A/1750A Series Waveform/Vector Monitor User Manual
G-1
Glossary
AC Coupled A connection which removes the constant
voltage (DC component) on which the signal (AC compo-
nent) is riding. Usually implemented by passing the signal
through a capacitor.
APL (Average Picture Level.) The average signal level
(with respect to blanking) during active picture time, ex-
pressed as a percentage of the difference between the blank-
ing and reference white levels.
Back Porch The portion of the video signal which lies
between the trailing edge of the horizontal sync pulse and the
start of the active picture time. Burst is located on back
porch.
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.
Black Burst (NTSC) Also called ”color black,” black
burst is a composite video signal consisting of all horizontal
and vertical synchronization information, burst, and usually
setup. Typically used as the house reference synchronization
signal in television facilities.
Black Burst (PAL) Also called ”color black,” black
burst is a composite video signal consisting of all horizontal
and vertical synchronization information and burst. Typical-
ly used as the house reference synchronization signal in
television facilities.
Blanking Level Refers to the 0 IRE level for NTSC
systems (0.3 volt level, with respect to sync tip, for PAL
systems) which exists before and after horizontal sync and
during the vertical interval.
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