SAA7121 Ver la hoja de datos (PDF) - Philips Electronics
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componentes Descripción
Fabricante
SAA7121 Datasheet PDF : 32 Pages
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Philips Semiconductors
Digital Video Encoder (ConDENC)
Preliminary specification
SAA7120; SAA7121
Table 15 Subaddress 5D
DATA BYTE
DESCRIPTION
BLCKL
variable black level; input
representation
accordance with
“CCIR 601”
DECOE
real time control
CONDITIONS
white-to-sync = 140 IRE(1)
BLCKL = 0
BLCKL = 63 (3FH)
white-to-sync = 143 IRE(2)
BLCKL = 0
BLCKL = 63 (3FH)
logic 0
logic 1
REMARKS
recommended value: BLCKL = 42 (2AH)
output black level = 34 IRE
output black level = 54 IRE
recommended value: BLCKL = 35 (23H)
output black level = 32 IRE
output black level = 52 IRE
disable odd/even field control bit from RTCI
enable odd/even field control bit from RTCI
(see Fig.10)
Notes
1. Output black level/IRE = BLCKL × 2/6.29 + 34.0
2. Output black level/IRE = BLCKL × 2/6.18 + 31.7
Table 16 Subaddress 5E
DATA BYTE
DESCRIPTION
BLNNL
variable blanking level
DECPH
real time control
CONDITIONS
white-to-sync = 140 IRE(1)
BLNNL = 0
BLNNL = 63 (3FH)
white-to-sync = 143 IRE(2)
BLNNL = 0
BLNNL = 63 (3FH)
logic 0
logic 1
REMARKS
recommended value: BLNNL = 46 (2EH)
output blanking level = 25 IRE
output blanking level = 45 IRE
recommended value: BLNNL = 53 (35H)
output blanking level = 26 IRE
output blanking level = 46 IRE
disable subcarrier phase reset bit from RTCI
enable subcarrier phase reset bit from RTCI
(see Fig.10)
Notes
1. Output black level/IRE = BLNNL × 2/6.29 + 25.4
2. Output black level/IRE = BLNNL × 2/6.18 + 25.9
Table 17 Subaddress 5F
DATA BYTE
DESCRIPTION
BLNVB
variable blanking level during vertical blanking interval is typically identical to value of BLNNL
CCRS
select cross colour reduction filter in luminance; see Table 18
Table 18 Logic levels and function of CCRS
CCRS1
0
0
1
1
CCRS0
0
1
0
1
DESCRIPTION
no cross colour reduction; for overall transfer characteristic of luminance see Fig.3
cross colour reduction #1 active; for overall transfer characteristic see Fig.3
cross colour reduction #2 active; for overall transfer characteristic see Fig.3
cross colour reduction #3 active; for overall transfer characteristic see Fig.3
1997 Jan 06
16
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