參數(shù)資料
型號(hào)： BT865AKPF
英文描述： Color Encoder Circuit
中文描述： 顏色編碼器電路
文件頁(yè)數(shù)： 28/76頁(yè)
文件大?。?/td> 1050K
代理商： BT865AKPF
1.0 Circuit Description
Bt864A/865A
1.5 Video Timing
YCrCb to NTSC/PAL Digital Video Encoder
1-18
Conexant
100138B
1.5.7 Burst Blanking
For interlaced NTSC, color burst information is automatically disabled on scan
lines 1
–
9 and 264
–
272, inclusive. (SMPTE line numbering convention.)
For interlaced PAL-M color burst information is automatically disabled on
scan lines 1
–
11 and 263
–
273 and 525 of FIELD 1 and FIELD 2 and scan lines
1
–
10 and 262
–
272 of FIELDs 3 and 4.
For interlaced PAL
–
B, D, G, H, I, N, Nc, color burst information is
automatically disabled on scan lines 1
–
6, 310
–
318, and 623
–
625, inclusive, for
FIELDs 1, 2, 5, and 6. During FIELDs 3, 4, 7, and 8, color burst information is
disabled on scan lines 1
–
5, 311
–
319, and 622
–
625, inclusive.
For noninterlaced NTSC, color burst information is automatically disabled on
scan lines 1
–
6 and 260
–
262, inclusive.
For noninterlaced PAL-M, color burst information is automatically disabled
on scan lines 1
–
10 and 260
–
262.
For noninterlaced PAL
–
B, D, G, H, I, N, Nc, color burst information is
automatically disabled on scan lines 1
–
6 and 310
–
312, inclusive. See
Figures 1-4
–
1-12
.
1.5.8 Digital Processing
The input is scaled to YUV format. For the CVBS, Y, and C outputs, the UV
components are low-pass filtered with a filter response shown in
Figures 1-13
and
1-14
(linearly scalable by clock frequency). The Y and filtered UV components
are upsampled to CLK frequency by a digital filter whose response is shown in
Figures 1-15
and
1-16
. For the RGB outputs, the scaled YUV is color space
converted and output.
1.5.9 Chrominance Disable
The chrominance subcarrier may be turned off by setting the DCHROMA bit to a
logical one. This kills burst as well, providing luminance only signals on the
CVBS outputs and a static blank level on the C/R output (RGBOUT = 0).
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