ml87v2105 Oki Semiconductor, ml87v2105 Datasheet - Page 39

• Manufacturer Part Number: ml87v2105
• Description: Video Signal Noise Reduction Ic With A Built-in 5.6 Mbit Frame Memory
• Manufacturer: Oki Semiconductor

OKI Semiconductor
Judgment of the noise status is achieved by comparing the average noise value (YAVRO[6:0], CAVRO[6:0]),
the noise status comparison value (I
(SUB:54h-bit[5:0]), YAVR2 [6:0] (SUB:55h-bit[6:0]), CAVR2[6:0] (SUB:56h-bit[6:0])). Based on this
judgment, the noise status signals (YDTO1, CDTO1, YDTO2, CDTO2) are generated.
The detection of noise status signal has a hysteresis characteristic as shown in Figure F1-3-6 (5). Select the
characteristic with YAH1 (SUB:53h-bit[7]), CAH1 (SUB:54h-bit[7]), YAH2 (SUB:55h-bit[7]), and CAH2
(SUB:56h-bit[7]).
It is also possible to mask the luminance detection in order to enable color difference detection by setting ACY
(SUB:49h-bit[2]. The color difference detection is enabled when YDTO1 = 1 for CDTO1 and YDTO2 = 1 for
CDTO2.
Judging noise status detection
Table F1-3-7 (12) Color Difference Judgment Noise Status Detection 1
Table F1-3-7 (14) Color Difference Judgment Noise Status Detection 2
Table F1-3-7 (11) Luminance Judgment Noise Status Detection 1
transition
transition
transition
transition
Table F1-3-7 (13) Luminance Judgment Noise Level Detection 2
CDTO1
CDTO2
YDTO1
YDTO2
Before
Before
Before
Before
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
CAVRO[6:0]
CAVRO[6:0] > CAVR1[5:0] x (hysteresis
CAVRO[6:0]
CAVRO[6:0] > CAVR2[6:0] x (hysteresis
YAVRO[6:0]
YAVRO[6:0] > YAVR1[5:0] x (hysteresis
YAVRO[6:0]
YAVRO[6:0] > YAVR2[6:0] x (hysteresis
2
C-bus setting registers YAVR1[5:0] (SUB:53h-bit[5:0]), CAVR1[5:0]
CAVRO[6:0]
CAVRO[6:0] > CAVR1[5:0]
CAVRO[6:0]
CAVRO[6:0] > CAVR2[6:0]
YAVRO[6:0]
YAVRO[6:0] > YAVR1[5:0]
YAVRO[6:0]
YAVRO[6:0] > YAVR2[6:0]
coefficient)
coefficient)
coefficient)
coefficient)
coefficient)
coefficient)
coefficient)
coefficient)
YAVR1[5:0] x (hysteresis
CAVR1[5:0] x (hysteresis
YAVR2[6:0] x (hysteresis
CAVR2[6:0] x (hysteresis
Condition
Condition
Condition
Condition
YAVR1[5:0]
CAVR1[5:0]
YAVR2[6:0]
CAVR2[6:0]
transition
transition
transition
transition
YDTO1
CDTO1
YDTO2
CDTO2
After
After
After
After
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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