參數(shù)資料
型號： TMC2491A
廠商： Fairchild Semiconductor Corporation
英文描述： Multistandard Digital Video Encoder(多標(biāo)準(zhǔn)數(shù)字視頻編碼器)
中文描述： 多標(biāo)準(zhǔn)數(shù)字視頻編碼器（多標(biāo)準(zhǔn)數(shù)字視頻編碼器）
文件頁數(shù)： 19/36頁
文件大小： 208K
代理商： TMC2491A
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
field 1 of the eight-field sequence to establish and maintain a
specific relationship between the leading edge of horizontal
sync and color burst phase (SCH). Proper subcarrier phase is
maintained through the entire eight field 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 first positive or
negative zero-crossing of the color burst subcarrier refer-
ence. In PAL, SCH is defined for line 1 of field 1, but since
there is no color burst on line 1, SCH is usually measured at
line 7 of field 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 Identification
EE Equalization pulse
SE Half-line vertical sync pulse, half-line equalization pulse
SS Vertical sync pulse
ES Half-line equalization pulse, half-line vertical sync pulse
EB Equalization broad pulse
-VEHalf-line video, half-line equalization pulse,
color burst suppressed
UBB
UVV
-BB
-VV
UVV
Black and Burst
1
Active video
Blank line with color burst suppression
2
Active video with color burst suppressed
Half-line black, half-line video
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
Line
1
2
3
4
5
6
7
8
9
…
17
18
…
258
259
260
261
262
Field 2 and 6
FID = 001, 101
Line
263
264
265
266
267
268
269
270
271
…
279
280
…
521
522
523
524
525
Field 3 and 7
FID = 010, 110
Line
1
2
3
4
5
6
7
8
9
…
17
18
…
258
259
260
261
262
Field 4 and 8
FID = 011, 111
Line
263
264
265
266
267
268
269
270
271
…
279
280
…
521
522
523
524
525
ID
SS
SS
SS
EE
EE
EE
-BB
-BB
UBB
…
UBB
UVV
…
UVV
UVV
-VE
EE
EE
ID
ES
SS
SS
SE
EE
EE
EB
-BB
UBB
…
UBB
UVV
…
UVV
-VV
EE
EE
EE
ID
SS
SS
SS
EE
EE
EE
-BB
UBB
UBB
…
UBB
UVV
…
UVV
-VV
-VE
EE
EE
ID
ES
SS
SS
SE
EE
EE
EB
-BB
UBB
…
UBB
UVV
…
UVV
UVV
EE
EE
EE
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