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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 9/80頁(yè) |
| 文件大?。?/td> | 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
9
Sync Processing
The sync processor of TW280X detects horizontal synchronization and vertical synchronization
signals in the composite. The TW280X utilizes proprietary technology for locking to weak, noisy,
or unstable signals such as those from on air signal and fast forward or backward of VCR
system.
Video Level Adjustment
A patented digital gain and clamp control circuit restores the ac coupled video signal to a fixed
dc level. The clamping circuit provides line-by-line restoration of the video pedestal level to a
fixed dc reference voltage. In no AGC mode, the gain control circuit adjusts only the video sync
gain to achieve desired sync amplitude so that the active video is bypassed regardless of the
gain control. But when AGC mode is enabled, both active video and sync are adjusted by the
gain control. The range of AGC is from –6dB to 18dB approximately.
Horizontal Sync Processing
The horizontal synchronization processing contains a sync separator, a PLL and the related
decision logic. The horizontal sync separator detects the horizontal sync by examining low-pass
filtered video input whose level is lower than a threshold. Additional logic is also used to avoid
false detection on glitches. The horizontal PLL locks onto the extracted horizontal sync in all
conditions to provide jitter free image output. In case the horizontal sync is missing, the PLL is
on free running status that matches the standard raster frequency.
Vertical Sync Processing
The vertical sync separator detects the vertical synchronization pattern in the input video
signals. The field status is determined at vertical synchronization time. When the location of the
detected vertical sync is inline with a horizontal sync, it indicates a frame start or the odd field
start. Otherwise, it indicates an even field.
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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(dòng)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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