參數(shù)資料
型號: TVP5146M1PFP
廠商: TEXAS INSTRUMENTS INC
元件分類: 顏色信號轉(zhuǎn)換
英文描述: COLOR SIGNAL DECODER, PQFP80
封裝: POWERPAD, PLASTIC, QFP-80
文件頁數(shù): 21/104頁
文件大小: 593K
代理商: TVP5146M1PFP
27
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. High-frequency components of the luminance signal are enhanced by a peaking filter (sharpness).
Figure 213, Figure 214, and Figure 215 show the characteristics of the peaking filter at four different gain settings
that are programmable via the host port.
Bandpass
Filter
x
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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