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| 型号： | TVP5147PFPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 颜色信号转换 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP80 |
| 封装： | GREEN, PLASTIC, HTQFP-80 |
| 文件页数： | 16/100页 |
| 文件大小： | 1465K |
| 代理商： | TVP5147PFPR |
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Functional Description
15
SLES099C—March 2007
TVP5147PFP
2.2.3 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 212 illustrates the basic functions
of the luminance data path. In the case of S-video, the luminance signal bypasses the comb filter or chroma
trap filter and is fed directly to the circuit. A peaking filter (edge enhancer) amplifies high-frequency
components of the luminance signal. Figure 213, Figure 214, and Figure 215 show the characteristics of
the peaking filter at four different gain settings that are user-programmable via the I2C interface.
Bandpass
Filter
×
Gain
Peaking
Filter
IN
+
OUT
Delay
Peak
Detector
Figure 212. Luminance Edge-Enhancer Peaking Block Diagram
f Frequency MHz
1
0
1
2
3
4
5
6
7
01234567
Gain = 0
Gain = 2
Gain = 1
Gain = 0.5
Peak at
f = 2.40 MHz
Amplitude
dB
f Frequency MHz
1
0
1
2
3
4
5
6
7
01234567
Gain = 0
Gain = 2
Gain = 1
Gain = 0.5
Peak at
f = 2.64 MHz
Amplitude
dB
Figure 213. Peaking Filter Response, NTSC
Square Pixel Sampling
Figure 214. Peaking Filter Response,
NTSC/PAL ITU-R BT.601 Sampling
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| TVP5147PFPRG4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL/SECAM 2x10-Bit Digital Video Decoder With Macrovision⑩ Detection,YPbPr Inputs,and 5-Line Comb Filter |
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