S5D2650 Samsung Semiconductor, Inc., S5D2650 Datasheet - Page 23

• Manufacturer Part Number: S5D2650
• Description: Multistandard Video Decoder/scaler
• Manufacturer: Samsung Semiconductor, Inc.

S5D2650 Data Sheet
1.4. HORIZONTAL CHROMA PROCESSING
A simplified block diagram for the horizontal chroma processing unit is shown in Figure 17.
The S5D2650 supports chroma input in NTSC, PAL, SECAM and component formats. The color standard is
automatically detected and the various chroma processing blocks are enabled as required for the given chroma
standard. Details of the various chroma processing blocks follow.
1.4.1. IF Compensation
For improved chroma demodulation when the input video is from a mis-tuned IF source, an IF compensation filter
is included that has variable gain for the upper chroma side band. This is controlled by the CIFCMP[1:0] bits at
location CDEM. The frequency response is shown in Figure 18. For convenience, all plots are normalized to the
NTSC modulation frequency.
FROM ADC
Saturation
Control
ELECTRONICS
COS
SIN
Figure 17.
CBW,FSEC
CBW,FSEC
Low
Pass
Low
Pass
Tracking
Gain
Horizontal Chroma Processing Unit
U
V
SAT
CGTC
CKILL
TSTCGN
HUE, TSTCFR
CFTC
Frequency
Tracking
SECAM
Frequency
Differentiator
Auto
Detect
Gain / PAL
Control
RTC_DTO
RTC_PID
UGAIN
VGAIN
RTCO
Control
Offset
Control
CKILL
UOFFST
VOFFST
Color
Killer
MULTIMEDIA VIDEO
CORE
Coring
Control
PAGE 23 OF 95
7/18/03