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參數(shù)資料
| 型號： | LC749870LG |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA64 |
| 封裝： | 5 X 5 MM, FLGA-64 |
| 文件頁數(shù)： | 27/44頁 |
| 文件大?。?/td> | 538K |
| 代理商： | LC749870LG |
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LC749870LG
No.A1765-33/44
9. Two-dimensional Y/C Separation
The Y/C separator switches adaptive two-dimensional Y/C separation and one-dimensional Y/C separation according
to the input video system. The table below shows the relationship between input video system and Y/C separation
method.
Table 3 Relationship Between Input Video System and Y/C Separation Method
Video System
Y/C Separation Method
NTSC
Adaptive two-dimensional Y/C separation
NTSC-4.43
One-dimensional Y/C separation
PAL-B, G, D, K, I, M, N
Adaptive two-dimensional Y/C separation
PAL-60
One-dimensional Y/C separation
SECAM
One-dimensional Y/C separation
1) Adaptive Two-dimensional Y/C Separation
The correlation between lines is detected in the vertical LPF and BPF, and the system switches between upper two line
processing and lower two or three line processing, based on the results. The adaptive two-dimensional Y/C separation
and two-dimensional Y/C separation can be switched using I2BYC_2DCOMB8 [7]. Note that the Y/C separation filter
is switched to one-dimensional Y/C separation when I2BYC_1DFIL [0] is set to 1’b1 ( I2BYC_1DFIL [0] = 1’b1).
Y signal = (Vertical low frequency component) + (Horizontal low frequency component of vertical high frequency)
C signal = Horizontal high frequency component of vertical high frequency.
Fig.5 Basic Block Diagram of Two-dimensional Y/C Separation (Line Comb Filter)
1 Line Chroma Detector
When 1 line chroma is separated with the two-dimensional Y/C separation, the dot interference is generated because
there is no correlation between lines. Therefore, 1 line chroma is detected and dot interference reduction is attempted
by subtracting chroma components.
When the following conditions exist, it is judged to be 1 line chroma.
(1) No chroma changes in the line (horizontal direction).
(2) Chroma changes between lines (vertical direction).
(3) Luminance changes between lines (vertical direction).
HorizontalBPF
Separation Y output
Separation C output
Composite signal
input
Horizontal
frequency
Vertical frequency
3.58MHz
525/4cph
Pass range
Vertical frequency
Horizontal
frequency
3.58MHz
525/4cph
Pass range
Vertical BPF
Vertical LPF
HorizontalLPF
Vertical frequency
Horizontal
frequency
3.58MHz
525/4cph
Pass range
Vertical frequency
Horizontal
frequency
3.58MHz
525/4cph
Pass range
Vertical frequency
Pass range
Horizontal
frequency
3.58MHz
525/4cph
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