參數(shù)資料
型號: L64780
廠商: LSI Corporation
英文描述: DVB-T COFDM Demodulator(對地數(shù)字視頻廣播 正交編碼頻率分割多路處理解調(diào)器)
中文描述: 的DVB - T COFDM解調(diào)器(對地數(shù)字視頻廣播正交編碼頻率分割多路處理解調(diào)器)
文件頁數(shù): 18/126頁
文件大?。?/td> 953K
代理商: L64780
1-8
Introduction
Figure 1.5
illustrates the target protection ratio of PAL-I into DVB-T. The
point indicated by “carriers coincident about here” shows the point where
the vision carrier of the PAL-I signal lines up directly with one of the
carriers on the ODFM frequency raster.
Figure 1.5
DVB-T Carrier to Co-channel PAL-I Interference Ratio
for Failure
Figure 1.6
illustrates the maximum level of echo acceptable to the
demodulator. The graph shows that in the selected mode, the
demodulator works without failure inside the guard interval and without
failure significantly outside it.
Figure 1.6
Maximum Level of a Single Echo for Failure of QPSK,
Rate 1/2, Guard Interval 7
2
0
2
4
6
8
10
12
2500
1500
Normal Frequency Offset (Hz)
64 QAM Rate 2/3
16 QAM Rate 3/4
QPSK Rate 1/2
500
500
1500
2500
Less Robust
More Robust
C
Carriers coincident
about here
0
2
4
6
8
10
0 10 20 30 40 50 60 70 80 90 100
Delay (
μ
s)
R
No failure for echo here.
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