SAA7113 Philips Semiconductors, SAA7113 Datasheet - Page 16

• Manufacturer Part Number: SAA7113
• Description: 9-bit video input processor
• Manufacturer: Philips Semiconductors

Philips Semiconductors
8.4
The 9-bit luminance signal, a digital CVBS format or a
luminance format (S-VHS, HI8), is fed through a
switchable prefilter. High frequency components are
emphasized to compensate for loss. The following
chrominance trap filter (f
frequency set according to the selected colour standard)
eliminates most of the colour carrier signal. It should be
bypassed via I
S-video (S-VHS, HI8) signals.
1999 Jul 01
handbook, full pagewidth
9-bit video input processor
(1) 43H.
Fig.11 Luminance control SA 09H, 4.43 MHz trap/CVBS mode, prefilter on, different aperture band-pass centre
(dB)
V Y
Luminance processing
18
18
30
6
6
0
frequencies.
2
C-bit BYPS (subaddress 09H, bit 7) for
(2) 53H.
0
= 4.43 or 3.58 MHz centre
(1)
(2)
(4)
(3)
2
(3) 63H.
16
4
The high frequency components of the luminance signal
can be peaked (control for sharpness improvement via
I
filters with selectable transfer characteristic. This signal is
then added to the original (unpeaked) signal. For the
resulting frequency characteristics see Figs 11 to 18.
A switchable amplifier achieves common DC amplification,
because the DC gains are different in both chrominance
trap modes. The improved luminance signal is fed to the
BCS control located in the chrominance processing block,
see Fig.19.
2
(4) 73H.
C-bus subaddress 09H, see Table 36) in two band-pass
(1)
(2)
(4)
(3)
6
f
Y (MHz)
Product specification
SAA7113H
MGD139
8