Tektronix 1760 series, Руководство пользователя

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Glossary
G-2
1760 Series Component Waveform/Vector Monitor User Manual
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 tele-
vision facilities.
Blanking Level
Refers to the 0 IRE level for NTSC sys-
tems (0.3 volt level, with respect to sync tip, for PAL sys-
tems) which exists before and after horizontal sync and
during the vertical interval.
Breezeway
The portion of the video signal which lies
between the trailing edge of the horizontal sync pulse and
the start of burst. Breezeway is part of back porch.
Broad Pulses
Another name for the vertical synchroniz-
ing pulses in the center of the vertical interval. These pulses
are long enough to be distinguished from all others, and are
the part of the signal actually detected by vertical sync sepa-
rators.
Bruch Blanking (PAL)
A 4-field burst blanking se-
quence employed in PAL signals to ensure that burst phase is
the same at the end of each vertical interval.
Burst (NTSC)
A small reference packet of the subcarrier
sine wave, typically 8 or 9 cycles, which is sent on every line
of video. Since the carrier is suppressed, this phase and fre-
quency reference is required for synchronous demodulation
of the color information in the receiver.
Burst (PAL)
A small reference packet of the subcarrier
sine wave sent during the horizontal blanking interval on
every line of video. Since the carrier is suppressed, this
phase and frequency reference is required for synchronous
demodulation of the color difference signals in the receiver.
B--Y (NTSC)
One of the color difference signals used in
the NTSC system, obtained by subtracting luminance from
the blue camera signal. This is the signal which drives the
horizontal axis of a vectorscope.