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Technical Stuff
About Y/C Separation Circuit
The S-video system provides a better quality of reproduction
because it treats the luminance (Y) and color (C) signals
separately while the conventional composite video signal
system handles these two signals combined. The XV-C900
not only has S-video connectors but also a Y/C signal
separation circuit which separates the composite video
signal into Y and C signals. The composite signal input to
the V SOURCE
IN jack goes through this Y/C signal
separation circuit and is output to the S-VIDEO OUTPUT
connector as a Y/C signal. (It is also output to the V
OUTPUT jack as the composite signal.)
In other words,
connecting a recording VCR equipped with an S-video input
connector to the XV-C900's S-VIDEO OUTPUT allows
recording of composite signals in the S-video system.
When
a Y/C signal is input to S-VIDEO SOURCE
IN, on the other
hand, it is combined into a composite signal and output to
the V OUTPUT jack as well as a Y/C signal to S-VIDEO
OUTPUT.
18
What is "Gamma Compensation'?
As shown in Diagram (A) below, a video signal is composed
of a luminance, color, sync and color burst signals. The
details of the video image are determined by the luminance
signal. The GAMMA function serves to offer non-linear
correction of the luminance and color signals.
Diagram (B) shows standard luminance correction.
In this
case, the white, black and intermediate segments turn white
or black in the same ratios. This causes the subject to lack
overall clarity.
Diagram (C) shows correction of the luminance signal using
the GAMMA function.
Turning the GAMMA control
clockwise causes the high frequency zones (white) and low
frequency zones (black) to stay constant while the
luminance signal in the central area increases, as in the (+)
area in the diagram.
This results in the entire picture
becoming whiter without destroying the white and black
outlines.
Turning the control anticlockwise causes the
adjustment shown in the (-) area, with the result that the
entire picture becomes darker without destroying the
outlines of the subject.
Color signal
(A)
White level 100% yf
as
a
Luminance signal
Burst signal (1 Vp-p)
"
"
Sync signal
Pa
-
GOD.
thigh low"
high
low ®
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