SDA9400 Datasheet, PDF (25/94 Pages) Micronas – Scan Rate Converter using Embedded DRAM Technology Units

SDA 9400
signal the delay of the feed back path can be either a field delay (DTNRON=0) or a frame delay
(DTNRON=1) (block diagram of noise reduction).
Equation for temporal noise reduction (luminance signal)
YOUT
=
æ
è
1_-----+_-----K_----y_-ö
16
Θ
YSNR
–
YR
Ρ
+
YR
Equation for temporal noise reduction (chrominance signal)
UVOUT
=
æ
è
1_-----+_-----K_--ö
16
ΘU
VSNR
–
U
V1Ρ
+
UV1
;K
=
Θ K y ;K u v Ρ
The next figure shows the motion detector in more detail. Temporal noise reduction can be switched
off by NRON (NRON=0). The parameter TNRFIY/C switches between a fixed noise reduction K-
factor TNRVAY/C (TNRFIY/C=0) or a motion adaptive noise reduction K-factor (TNRFIY/C=1).
Block diagram of motion detector
TNRCLY/C+1 TNRKOY/C+1 TNRFIY/C NRON
DY/UV
Motion
detection
Motion
LUT
1
MUX
00
15
1
MUX
0
TNRHOY/C TNRVAY/C
Ky/uv
In case of adaptive noise reduction the K-factor depends on the detected “Motion” (see figure
above). The “Motion”-Ky/Kuv characteristic curve (LUT) is fixed inside the SDA 9400, but the
characteristic curve can be changed by two parameters: TNRHOY/C and TNRKOY/C. TNRHOY/C
shifts the curve horizontally and TNRKOY/C shifts the curve vertically. For a fixed characteristic
curve, the sensitivity of the motion detector is adjustable by TNRCLY/C.
Micronas
25
Preliminary Data Sheet