参数资料
型号: TVP5158PNPR
厂商: TEXAS INSTRUMENTS INC
元件分类: 颜色信号转换
英文描述: COLOR SIGNAL DECODER, PQFP128
封装: GREEN, PLASTIC, HTQFP-128
文件页数: 22/108页
文件大小: 1395K
代理商: TVP5158PNPR
Peak
Detector
Bandpass
Filter
Peaking
Filter
Delay
IN
Gain
OUT
+
x
SLES243E
– JULY 2009 – REVISED MARCH 2011
Figure 3-6. Chroma Trap Filter Frequency Response, NTSC ITU-R BT.601 Sampling
Figure 3-7. Chroma Trap Filter Frequency Response, PAL ITU-R BT.601 Sampling
3.2.4
Luminance Processing
The digitized composite video signal passes through either a luminance comb filter or a chroma trap filter,
either of which removes chrominance information from the composite signal to generate a luminance
signal. The luminance signal is then fed into the input of a peaking circuit. Figure 3-8 shows the basic
functions of the luminance data path. A peaking filter (edge enhancer) amplifies high-frequency
components of the luminance signal. Figure 3-9 shows the characteristics of the peaking filter at four
different gain settings that are user-programmable via the I2C interface.
Figure 3-8. Luminance Edge-Enhancer Peaking Block Diagram
20
Functional Description
Copyright
2009–2011, Texas Instruments Incorporated
Product Folder Link(s): TVP5158 TVP5157 TVP5156
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