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參數(shù)資料
| 型號： | TW2802 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | TW2802/4 Multiple Video Decoder For Security Applications |
| 中文描述： | TW2802 / 4多路視頻解碼器的安全應(yīng)用 |
| 文件頁數(shù)： | 17/80頁 |
| 文件大小： | 946K |
| 代理商： | TW2802 |
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www.techwellinc.com
Preliminary
TW2804/TW2802 Multiple Video Decoder
Techwell, Inc.
Datasheet Rev. 2.4
09/09/2003
17
Down scaling is achieved by programming the horizontal scaling register (HSCALE) and vertical
scaling register (VSCALE). When no scaled video image, the TW280X will output the number of
pixels per line as specified by the HACTIVE register. If the number of output pixels required is
smaller than the number specified by the HACTIVE register, the 16bit HSCALE register is used
to reduce the output pixels to the desired number.
Following equation is used to determine the horizontal scaling ratio to be written into the 16bit
HSCALE register.
HSCALE = [N
pixel_desired
/ HACTIVE] * (2^16 – 1)
Where N
pixel_desired
is the desired number of active pixels per line
For example, to scale full picture (HACTIVE is 720) to CIF (360 pixels), the HSCALE value can
be found as:
HSCALE = [320/720] * (2^16 – 1) = 0x7FFF
Following equation is used to determine the vertical scaling ratio to be written into the 16bit
VSCALE register.
VSCALE = [N
line_desired
/ VACTIVE] * (2^16 - 1)
Where N
line_desired
is the desired number of active lines per field
For example, to scale full picture (VACTIVE is 240or288) to CIF (120/144 lines), the VSCALE
value can be found as:
VSCALE = [120 / 240] * (2^16 – 1) = 0x7FFF for 60Hz
VSCALE = [144 / 288] * (2^16 – 1) = 0x7FFF for 50Hz
The scaling ratios of popular case are listed in Table 2
Table 2 HSCALE and VSCALE value for some popular video formats
Scaling
Ratio
Resolution
NTSC
PAL
720x576
NTSC
PAL
360x288
NTSC
PAL
180x144
Format
Output
HSCALE
VSCALE
1
720x480
0xFFFF
0xFFFF
0x7FFF
0x7FFF
0x3FFF
0x3FFF
0xFFFF
0xFFFF
0x7FFF
0x7FFF
0x3FFF
0x3FFF
1/2 (CIF)
360x240
1/4 (QCIF)
180x120
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TW2802-FA | 功能描述:IC DECODER VIDEO NTSC/PAL RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機(jī)，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| TW-28-02-F-D-309-SM | 制造商:Samtec Inc 功能描述:2MM TERMINAL STRIPS - Bulk |
| TW-28-02-FM-D-309-SM | 制造商:Samtec Inc 功能描述:2MM TERMINAL STRIPS - Bulk |
| TW-28-02-FM-S-309-SM | 制造商:Samtec Inc 功能描述:2MM TERMINAL STRIPS - Bulk |
| TW-28-02-F-S-309-SM | 制造商:Samtec Inc 功能描述:2MM TERMINAL STRIPS - Bulk |
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