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參數(shù)資料
| 型號(hào)： | TB1254N |
| 廠商： | Toshiba Corporation |
| 英文描述： | PAL / NTSC / SECAM 1CHIP (IF+VCD PROCESSOR) IC |
| 中文描述： | PAL / NTSC制式/ SECAM制式1CHIP（中頻光碟處理器）芯片 |
| 文件頁(yè)數(shù)： | 39/58頁(yè) |
| 文件大?。?/td> | 551K |
| 代理商： | TB1254N |
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Ver3.7
00/01/28
39
Note
V14
Items/Symbols
Black Expansion Start
Point
/ V
BLEX25
/ V
BLEX35
/ V
BLEX45
Bus conditoins
Uni-Color:127
Color:0
Black
stretch:00/01
/10/11
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
Measurement methods
(1) nput a gray raster with sync to Pin38&39.
(2) Set black stretch to 25IRE.
(3) Decreasing Y amplitude of input from 50IRE, measure a Y
amplitude as the figure below, that is “V
BLEX25
”
(4) Set black stretch to 35IRE/45IRE.
(5) Repeat (3), that is ‘V
BLEX35
”, “V
BLEX45
”. below, that is “V
Y
90
”
(6) Find gain of the portion that the black stretch has an effect on.
#20
output
Black Expansion AMP
Gain
/ G
BLEX
Black
stretch
=off
25/35/45IRE
#39 input
V
BLEX25
V16
DC Restration Gain
/ V
Dcrest120
/ V
Dcrest90
/ V
Dcrest step
Uni-Color:127
Color:0
Black
stretch:00/01
/10/11
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
Uni-Color:127
Brightness:127
Color:0
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
C-Trap:0/1
Uni-Color:127
Color:0
RGB Mute:0
R cut off:63
DC
Others:Preset
Ysm Mode:0
Uni-Color:127
Color:0
RGB Mute:0
R cut off:63
DC rest.:10
Others:Preset
(1) nput a 100IRE signal with sync into Pin38&39.
(2) Set DC rest. to 10.
(3) Measure a Y amplitude of pin20 output, that is V100.
(4) Set DC rest to 00.
(5) Measure a Y amplitude of pin20 output, that is V120.
(6) Calculate, “V
dcrest120
” =(V120/V100)
×
100
(7) Set DC rest to 11.
(8) Repeat (5)&(6), that is “V
Dcrest90
”.
(9) Calculate, “V
Dcrest step
”=(V
dcrest120
- V
Dcrest90
)/4
(1)Input a 120IRE ramp signal with sync into Pin38&39.
(2)Measure the amplitude from cut-off level to peak(at which
output signal is clipped), that is "V
WPS
".
V17
WPS Level
/ V
WPS
V18
Chroma Trap Gain
/ G
TRAP
rest.:10
(1)Input a 0.5Vp-p, 3.58MHz signal with sync into Pin43&39.
(2)Measure the 3.58MHz amplitude at PIn20 for Chroma
Trap:1/0, that is V
TRAPON
/ V
TRAPOFF
.
(3)Calculate;"G
TRAP
"=20*log(V
TRAPON
/V
TRAPOFF
)
V19
Half
Characteristics for Y
/ G
HTY
Tone
(1)Input a 100IRE white signal with sync into Pin38&39.
(2)Measure the output picture amplitude at PIn20 , that is
V
HTYOFF
.
(3)Suppry Pin15 2V.
(4) Measure the output picture amplitude at PIn20 , that is V
HTYON
.
(3)Calculate;"G
HTY
"=20*log(V
HTYON
/V
HTYOFF
)
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