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參數(shù)資料
| 型號： | 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？多標準視頻解碼器，高品質下倍線器 |
| 文件頁數(shù)： | 7/74頁 |
| 文件大?。?/td> | 630K |
| 代理商： | TW9903 |
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TW9903
TECHWELL, INC.
7
REV. 0.92 ( B )
06/02/2002
Vertical sync processing
The vertical sync separator detects the vertical synchronization pattern in the input video signals.
In addition, the actual sync determination is controlled by a detection window to provide more
reliable synchronization. It achieves the functionality of a PLL without the complexity of a PLL. An
option is available to provide faster responses for certain applications. 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. The field logic can also be controlled to toggle automatically while tracking the input.
Color Decoding
Y/C separation
The color-decoding block contains the luma/chroma separation for the composite video signal and
multi-standard color demodulation. For NTSC and PAL standard signals, the luma/chroma
separation can be done either by comb filter or notch/band-pass filter combination. For SECAM
standard signals, only notch/band-pass filter is available. The default selection for NTSC/PAL is
comb filter. The characteristics of the band-pass filter is shown in the filter curve section.
In the case of comb filter, the TW9903 separates luma (Y) and chroma (C) of a NTSC composite
video signal using a proprietary 2H adaptive comb filter. The filter uses a two-line buffer. Adaptive
logic combines the upper-comb and the lower-comb results based on the signal changes among
the previous, current and next lines. This technique leads to good Y/C separation with small cross
luma and cross color at both horizontal and vertical edges. Due to the 90-degree phase difference
on adjacent lines of a PAL chroma signal, the 2H line memory are used optionally to provide an
adequate PAL comb filter performance.
Due to the line buffer used in the comb filter, there is always one line processing delay in the output
images in general except the PAL comb filter case, which has no line delay.
If notch/band-pass filter is selected, the characteristics of the filters are shown in the filter curve
section.
Color demodulation
The color demodulation for NTSC and PAL standard is done by first quadrature mixing the chroma
signal to the base band. The mixing frequency is equal to the sub-carrier frequency for NTSC and
PAL. After the mixing, a low-pass filter is used to remove carrier signal and yield chroma
components. The low-pass filter characteristic can be selected for optimized transient color
performance. For the PAL system, the PAL ID or the burst phase switching is identified to aid the
PAL color demodulation.
For SECAM, the mixing frequency is 4.286Mhz. After the mixer and low-pass filter, it yields the FM
modulated chroma. The SECAM demodulation process therefore consists of low-pass filter, FM
demodulator and de-emphasis filter. The filter characteristics are shown in filter curve section.
During the FM demodulation, the chroma carrier frequency is identified and used to control the
SECAM color demodulation.
The sub-carrier signal for use in the color demodulator is generated by direct digital synthesis PLL
that locks onto the input sub-carrier reference (color burst). This arrangement allows any sub-
standard of NTSC and PAL to be demodulated easily with single crystal frequency.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TW9903-FB | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝: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 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝: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 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝: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 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝: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 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
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