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Measurement methods
The following paragraphs specify
the methods for each Option 11
measurement. Where appropriate,
reference is made to the relevant
CCIR recommendation.
Line blanking timing measurements
Color Burst Duration: Measured
between the half-amplitude
points of the burst chrominance
envelope. Result expressed as
the number of cycles between
the half-amplitude points. See
duration “h’
’ in wavefor
m
diagram. CCIR Report 624-1.
Front Porch Duration: Measured
from the half-amplitude point
between peak white-level and
blanking to the half-amplitude
point of the leading edge of sync.
See duration “c’
’ in wavefor
m
diagram. CCIR Report 624-1.
L
ine Blanking Interval:
M
ea-
sured from the half-amplitude
point between peak white-level
and blanking at the front
p
orch to the half-amplitude
point between blanking-level
and peak white level at the
back porch. See duration “a’’
in waveform diagram. CCIR
R
eport 624-1.
Line Sync Rise and Fall Time
(
Build-up Times):
M
easured
between the 10% point and
the 90% point of the line-syn-
chronizing pulse leading edge
(Rise Time) and trailing edge
(Fall Time).
Line Sync Width: Measured
between the half-amplitude
points on the leading edge and
trailing edge of sync. See dura-
tion “d’
’ in waveform diagram.
CCIR Report 624-1.
Sync-to-Start of Burst: Mea-
sured from the half-amplitude
point of the leading edge of
sync to the half-amplitude
point of the leading edge of the
burst chrominance envelope.
See duration “g’’ in waveform
diagram. CCIR Report624-1.
Field blanking timing measurements
Equalizing Pulse Duration:
Measured between the
half-amplitude points of the
leading edge and trailing edge
of the equalizing pulse. See
duration “p’’ in waveform dia-
gram. CCIR Report 624-1,
Figure 2-1 (a), (b), and (c).
Broad Pulse Duration:
Measured between the
half-amplitude points of the
leading edge and trailing
edge of the br
oad pulse. See
duration “q’’ in waveform
diagram. CCIR Report 624-1,
Figur
e 2-1 (a), (b), and (c).
L
ine Blanking Timing Waveform Measurements.
Field Blanking Timing Waveform Measurements.
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