參數(shù)資料
型號： TMC2491AR2C
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 顏色信號轉(zhuǎn)換
英文描述： COLOR SIGNAL ENCODER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 11/36頁
文件大?。?/td> 208K
代理商： TMC2491AR2C
PRODUCT SPECIFICATION
TMC2490A/TMC2491A
19
Subcarrier Generation and Synchronization
The color subcarrier is generated by an internal digital
frequency synthesizer. The subcarrier synthesizer gets its
frequency and phase values preprogrammed into the
TMC2490(1)A.
In Master Mode, the subcarrier is internally synchronized on
eld 1 of the eight-eld sequence to establish and maintain a
specic relationship between the leading edge of horizontal
sync and color burst phase (SCH). Proper subcarrier phase is
maintained through the entire eight eld set, including the 25
Hz offset in PAL-N/B/I systems. The subcarrier is reset to
the phase values found in Table 9.
SCH Phase Control
SCH refers to the timing relationship between the 50% point
of the leading edge of horizontal sync and the rst positive or
negative zero-crossing of the color burst subcarrier refer-
ence. In PAL, SCH is dened for line 1 of eld 1, but since
there is no color burst on line 1, SCH is usually measured at
line 7 of eld 1. The need to specify SCH relative to a partic-
ular line in PAL is due to the 25 Hz offset of PAL subcarrier
frequency. Since NTSC has no such 25 Hz offset, SCH
applies to all lines.
Table 8. PAL-M Field/Line Sequence and Identication
EE Equalization pulse
UBB
Black and Burst1
SE Half-line vertical sync pulse, half-line equalization pulse
UVV
Active video
SS Vertical sync pulse
-BB
Blank line with color burst suppression 2
ES Half-line equalization pulse, half-line vertical sync pulse
-VV
Active video with color burst suppressed
EB Equalization broad pulse
UVV
Half-line black, half-line video
-VEHalf-line video, half-line equalization pulse,
color burst suppressed
Notes:
1. VBB lines are changed to UVV (Active Video) when VBIEN = 1
2. -BB lines are changed to -VV (Active Video, Burst Suppressed) when VBIEN = 1
Field 1 and 5
FID = 000, 100
Field 2 and 6
FID = 001, 101
Field 3 and 7
FID = 010, 110
Field 4 and 8
FID = 011, 111
Line
ID
Line
ID
Line
ID
Line
ID
1
SS
263
ES
1
SS
263
ES
2
SS
264
SS
2
SS
264
SS
3
SS
265
SS
3
SS
265
SS
4
EE
266
SE
4
EE
266
SE
5
EE
267
EE
5
EE
267
EE
6
EE
268
EE
6
EE
268
EE
7
-BB
269
EB
7
-BB
269
EB
8
-BB
270
-BB
8
UBB
270
-BB
9
UBB
271
UBB
9
UBB
271
UBB
…
17
UBB
279
UBB
17
UBB
279
UBB
18
UVV
280
UVV
18
UVV
280
UVV
…
258
UVV
521
UVV
258
UVV
521
UVV
259
UVV
522
-VV
259
-VV
522
UVV
260
-VE
523
EE
260
-VE
523
EE
261
EE
524
EE
261
EE
524
EE
262
EE
525
EE
262
EE
525
EE
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