SAA7144 NXP Semiconductors, SAA7144 Datasheet - Page 16

• Manufacturer Part Number: SAA7144
• Manufacturer: NXP Semiconductors

Specifications of SAA7144

• Package Type: LQFP
• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
9397 750 14454
Product data sheet
8.4 Luminance processing
The 9-bit luminance signal, a digital CVBS format, is fed through a switchable prefilter.
High frequency components are emphasized to compensate for loss. The following
chrominance trap filter (f
selected color standard) eliminates most of the color carrier signal. It can be bypassed via
I
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
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
2
Fig 11. Luminance control SA 09h, 4.43 MHz trap, prefilter on, different aperture
C-bus bit BYPS (subaddress 09h, bit 7).
(1) 43h
(2) 53h
(3) 63h
(4) 73h
(dB)
V
Y
band-pass center frequencies.
18
18
30
6
6
0
Rev. 01 — 21 April 2005
0
= 4.43 MHz or 3.58 MHz center frequency set according to the
(1)
(2)
(4)
(3)
2
2
C-bus subaddress 09h, see
4
Quadruple video input processor
(1)
(2)
(4)
(3)
Table
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
6
Figure
SAA7144HL
33) in two band-pass
Figure 11
f
Y
(MHz)
17.
mgd139
to
8
Figure
16 of 64
16.