參數(shù)資料
型號(hào)： KS0119
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Multimedia Video(帶傳統(tǒng)RAM-DAC功能的NTSC編碼器)
中文描述： 多媒體視頻（帶傳統(tǒng)的RAM - DAC的功能的NTSC制式編碼器）
文件頁(yè)數(shù)： 15/47頁(yè)
文件大?。?/td> 311K
代理商： KS0119
KS0119 Data Sheet
MULTIMEDIA VIDEO
ELECTRONICS
PAGE 15 OF 50
070595
3. SIGNAL PROCESSING
3.1. Y/C Interpolation Filters
The incoming YCbCr signals are processed by the Interpolation Unit to increase the data rates to 13.5 MHz. (4:4:4
format). The multiplexed chroma signals are up sampled first, and then pass through either a 6th-order half-band or
an 8th-order quarter-band filter. The reconstruction filters have flat 0 to 0.6 MHz frequency response as shown in
Figure 6-(a). The received half-sampled luminance component (MPEG decoder output, 360 samples/line), which
has a bandwidth less than 3 MHz, after being up sampled, will pass through a 14th-order smooth filter whose
frequency response characteristic is shown in Figure 6-(b). These filters ensure the preservation of base band
signals as well as the elimination of attendant high frequency aliasing components due to up sampling.
Figure 6. Interpolation Filter Characteristics
3.2. Band-limit Filter
The NTSC Encoder Unit consists of a 4 MHz luminance low pass filter and two equal bandwidth 1.2 MHz
chrominance low pass filters. The functions of these filters are to limit the frequency contents of the computer
generated image, to reduce the cross-luminance/chrominance distortion due to the mixing processes, and to
enhance the resolutions.The digital filters are designed to have faster roll-off than the analog counterparts so that
the quantization noise, which is monotonic decreasing along the frequency axis, are removed as soon as they pass
the band of interest. Figure 7 shows the overall filter characteristics (interpolation cascaded with band-limit) for X:1:1
and X:2:2 formatted data. Also shown in Figure 8 are the luminance band-limit characteristics with and without the
chroma filter.
At the filters’ outputs, each pixel is represented by 3 10-bit numbers, which are maintained until the DAC inputs.
Hence the block effects due to the limited quantization levels are reduced.
(a)
Chrominance
(b)
Luminance
A
A
Frequency (MHz)
Frequency (MHz)
HALF-BAND
QUARTER-BAND
相關(guān)PDF資料
PDF描述
KS0122 MULTISTANDARD VIDEO DECODER
KS0123 DIGITAL VIDEO ENCODER
KS0125 Multi-standard Video Encoder(多標(biāo)準(zhǔn)視頻編碼器)
KS0164 Multimedia Audio(波表合成芯片)
KS0165 Multimedia Audio(波表合成芯片)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
KS0122 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:MULTISTANDARD VIDEO DECODER
KS0123 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:DIGITAL VIDEO ENCODER
KS0127 制造商:Samsung SDI 功能描述:Digital video encoder & decoder
KS0127B 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:MULTISTANDARD VIDEO DECODER/SCALER
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