參數(shù)資料
型號(hào)： TW9903
廠商： Electronic Theatre Controls, Inc.
英文描述： TW9903 ? Multi-standard Video Decoder With High Quality Down Scaler
中文描述： TW9903？多標(biāo)準(zhǔn)視頻解碼器，高品質(zhì)下倍線器
文件頁(yè)數(shù)： 24/74頁(yè)
文件大?。?/td> 630K
代理商： TW9903
TW9903
TECHWELL, INC.
24
REV. 0.92 ( B )
06/02/2002
VBI Data Processing
A frame of video is composed of 525 lines for NSTC and 625 for PAL. The time required for the
electron beam to move from the bottom to the top of the screen is the vertical blanking period, and
it requires the equivalent of 21 horizontal active video scan lines. This portion is normally not seen.
During vertical blanking period, video lines before VBI Data are used for equalizing and
synchronization. In 525 line video system, many TV channels have special VBI data from line 10 to
line 21 or line22 in both odd and even fields. In 625 line video system, many TV channels have VBI
data from line 6 or 7 to line 23 in both odd and even fields. They are normally regarded as the
Vertical Blanking Interval or VBI portion of the video signal.
TW9903 VBI Overview
In the default configuration of the TW9903, the VBI region of the video signal is treated the same
way as the real image signal. It will decode this region of signal as if it was video by Y/C separation
and horizontal scaling. The TW9903 can also be configured in a mode known as VBI raw data
mode. In this mode, the raw VBI region data (AD converter output data of input VIDEO signal) can
be captured for later processing by software. It is done as follows. First, the analog composite
video signal is digitized. Then, it is converted to 8bit data stream at the input clock frequency,
normally 27MHz for a 27MHz crystal. Finally, the data is output to the VD [15:8] data pins in 8-bit
output mode. It can also be output as a 16-bit data stream on pins VD [15:0] at half of the crystal
rate in 16-bit output mode.
There are three modes of operation for the VBI raw data output feature.
1)
If VBI EN(Reg0x19[7]) is set to “0”. VBI raw data output mode is disabled. This is the default
mode of operation. In this mode, the decoder doesn’ t output valid data on VBI lines.
2)
If VBI EN(Reg0x19[7]) is set to “1”, VBI raw data output mode is enabled.TW9903 outputs a
clock rate VBI data stream during VBI data lines from line 6 (in 625 line video system) or
line10 (in 525 line video system) to the leading edge of VACTIVE. If LVALID is high and
VACTIVE is low, the line is VBI data output line. When VACTIVE is high, the TW9903 outputs
normal YCbCr data. Therefore, this mode can be used to capture both VBI raw data and
normal YCbCr video data simultaneously.
3)
If VBI Frame mode (Reg0x19[5]) is set to “1”, VBI frame output mode is enabled. VBI Frame
mode bit has the higher priority than VBI EN bit. In this mode, TW9903 treats every scan line
of the signal as a vertical interval line and outputs clock rate raw data on every line. Therefore,
no video image data is output. This mode can be used to capture raw data for later processing.
This mode of operation is designed for use in still-frame capture/processing applications.
When the device is set to VBI raw data output mode, the VBI data is output during HACTIVE signal
period. The DVALID or gated VCLK are used to indicate valid VBI data as in the normal video data
output mode .
A video/graphic controller should be able to do the following to capture VBI data output. It should
keep track of the line count in order to select specific lines for VBI data processing. It must be able
to use DVALID or VCLK for data qualification, and load only the valid data.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TW9903-FB 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類(lèi)型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799
TW9903-MB 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類(lèi)型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799
TW9903-MBS 功能描述:IC NTSC/PAL/SECAM DECODR 100PQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類(lèi)型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799
TW9905-FD 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類(lèi)型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799
TW9905-MD 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類(lèi)型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799
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