ml87v21071 Oki Semiconductor, ml87v21071 Datasheet - Page 44

• Manufacturer Part Number: ml87v21071
• Description: Video Signal Noise Reduction Ic With A Built-in Frame Memory
• Manufacturer: Oki Semiconductor

OKI Semiconductor
PODT
PODT
0
0
0
0
1
0
0
0
0
1
Judgment Noise Level Selection
Select the judgment noise level based on the procedure for basic noise level detection described above.
When PODT = 0 and PNON = 0, the blanking period noise level is referenced for the judgment noise level.
When PODT = 0 and PNON = 1, the overall noise status is referenced on the noise level of the valid data
period when the noise status of the blanking period is judged to be low noise (YBDTO1 = 0, CBDTO1 = 0).
When the noise status of the blanking period is judged to be high (YBDTO1 = 1, CBDTO1 = 1), the average
noise level of the blanking period and the average noise level of the valid period are compared and the smaller
value is referenced for the overall noise status.
Switching between the blanking period and the valid data period occurs when the noise average value
condition has continued for four frames or more.
When PODT = 1, the noise level of the valid data period is referenced for the judgment noise level.
PNON
PNON
0
1
1
1
X
0
1
1
1
X
Table F2-1-7 (9) Chrominance Judgment Noise Level Selection
Table F2-1-7 (8) Luminance Judgment Noise Level Selection
CBDTO1
YBDTO1
X
X
X
X
0
1
1
0
1
1
Luminance noise average value noise level
Chrominance noise average value noise
Blanking period ≤ Valid data period
Blanking period > Valid data period
Blanking period ≤ Valid data period
Blanking period > Valid data period
level condition
condition
—
—
—
—
—
—
Luminance judgment noise level
Chrominance judgment noise
Valid data period noise level
Valid data period noise level
Valid data period noise level
Valid data period noise level
Valid data period noise level
Valid data period noise level
Blanking period noise level
Blanking period noise level
Blanking period noise level
Blanking period noise level
level
PEDL87V21071-01
ML87V21071
44/123