1 color low-pass filter – Texas Instruments TVP5147M1PFP User Manual
Page 20
Functional Description
12
SLES140A—March 2007
TVP5147M1PFP
Line
Delay
–
Peaking
NTSC/PAL
Remodulation
NTSC/PAL
Demodulation
Notch
Filter
Color LPF
↓
2
5-Line
Adaptive
Comb
Filter
Notch
Filter
Notch
Filter
Notch
Filter
Contrast
Brightness
Saturation
Adjust
Cr
Y
Cb
Y
Burst
Accumulator
(U)
U
SECAM
Color
Demodulation
V
Delay
CVBS/Y
SECAM Luma
CVBS
CVBS/C
Color LPF
↓
2
Burst
Accumulator
(V)
U
V
Delay
Delay
Figure 2−3. Composite and S-Video Processing Block Diagram
2.2.2.1
Color Low-Pass Filter
High filter bandwidth preserves sharp color transitions and produces crisp color boundaries. However, for
nonstandard video sources that have asymmetrical U and V side bands, it is desirable to limit the filter
bandwidth to avoid UV crosstalk. The color low-pass filter bandwidth is programmable to enable one of the
three notch filters. Figure 2−4 and Figure 2−5 represent the frequency responses of the wideband color
low-pass filters.