UPD64084 NEC, UPD64084 Datasheet - Page 21

• Manufacturer Part Number: UPD64084
• Description: THREE-DIMENSIONAL Y/C SEPARATION LSI WITH ON-CHIP MEMORY
• Manufacturer: NEC

7. YNR/CNR BLOCK
7.1
signal. The noise component
nonlinear filter. Noise components are reduced by subtracting the noise component Y' signal from the current frame Y
signal. At the same time, the Y signal submitted to noise reduction is delayed by a frame to be used to generate Y for
the next frame. This way the frame recursive YNR is configured. Much the same processing is performed for the C
signal to reduce noise components.
7.2
components and noise components. Subtracting Y and C from the current frame Y and C signals causes inter-frame
motion components to remain in the output picture. To solve this problem, a nonlinear filter that passes only low-
amplitude signals is used; generally, motion components have a large amplitude, while noise components have a small
amplitude. How nonlinear the filter is to be is specified using YNRK, YNRLIM, YNRINV, CNRK, CNRLIM, and CNRINV
on the serial bus.
7.3
the LINE pin is at a high level, the killer detection circuit detects a color killer signal, or the KIL pin is at a high level,
YNR and CNR operations are stopped.
This block performs frame recursive YNR and CNR. It is used in the YCS+ mode.
The frame difference ( Y) signal is generated by subtracting the previous frame Y signal from the current frame Y
The
If the nonstandard signal detection circuit detects a vertical nonstandard signal or frame sync nonstandard signal, or
C signal input
Y signal input
YNR/CNR Processing
Nonlinear Filter
YNR/CNR Operation Stop
Y' and
Memory
Frame
1H
1H
526H
526H
C' noise components are extracted from
H
H
Demodulation
Previous frame C
Previous frame Y
Killer detection
signal detection
Nonstandard
Y' signal is extracted by eliminating the motion component of the
Current Y
Figure 7-1. YNR/CNR Block Diagram
YNR/CNR stop signal
Killer signal detected
Current C
difference
difference
Data Sheet S16021EJ2V0DS
Frame
Frame
Y
C
YNRINV
YNRLIM
YNRK
nonlinear
nonlinear
Delay
Delay
CNR
YNR
filter
filter
CNRINV
CNRLIM
CNRK
Y and
component
component
Noise
Noise
Y'
C'
C.
Y and
Substraction of noise component
Modulation
C contain inter-frame motion
LINE
KIL
Y signal output
C signal output
Y signal at the
PD64084
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