参数资料
型号: TVP5020CPFP
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: POWERPAD, PLASTIC, HTQFP-80
文件页数: 9/87页
文件大小: 394K
代理商: TVP5020CPFP
2–3
PAL-B,
D,G,H,I
NTSC,
PAL-M,N
–20
–25
–35
–40
0 0.5 1 1.5
2 2.5
3
Amplitude
dB
–10
–5
f – Frequency – MHz
0
4.5 5
5.5
6.5
–15
–30
3.5 46
Figure 2–3. Chroma Trap Filter Frequency Response for 13.5 MHz Sampling
NTSC,
PAL-M
PAL-N
PAL-B,
D,G,H.I
–20
–30
–35
–40
0
0.5 1 1.5
2
3
3.5
Amplitude
dB
–10
–5
f – Frequency – MHz
0
4.5 5 5.5
6.5
–15
–25
2.5
4
6
Figure 2–4. Chroma Trap Filter Frequency Response for Square-Pixel Sampling
2.2.2
Luminance Processing
The digitized composite video signal from the output of the A/D converter passes through a luminance comb
filter or a chroma trap filter that removes the chrominance signal from the composite signal to generate the
luminance signal. The luminance signal is then fed to the input of luminance signal peaking and coring
circuits. Figure 2–5 illustrates the functions of the luminance data path. High frequency components of the
luminance signal are enhanced further by the peaking filter (edge enhancer). Figures 2–6, 2–7, and 2–8
show the characteristic of the peaking filter at maximum gain. The coring circuit reduces low-level, high
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