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): 14/126頁
文件大?。?/td> 953K
代理商: L64780
1-4
Introduction
which then completes the error correction, delivering an MPEG-2
Transport Stream. Other MPEG-standard LSI Logic chips (for example,
L64118 and L64005) can then be used to demultiplex the MPEG-2
Transport Stream into its coded audio, coded video, and data
components, handle Conditional Access, and decode the audio and
video signals for presentation to the display and loudspeakers. In
Figure 1.1
, the microprocessor is embedded in the L64118. It controls
RF-channel selection, mode selection for the L64780 chip, and program
selection for the MPEG demultiplexer.
1.3 RF Tuner Block Functions
Figure 1.2
indicates the functions performed within the RF Tuner block.
The example uses a double-conversion approach, in which the RF Tuner
converts the UHF signal to a first IF (IF1, where filtering, amplification,
and gain control are done) followed by another conversion to the second
low IF, (IF2), required at the input of the L64780.
Figure 1.2
UHF Tuner Example
Tracking
RF Filter
IF 1
Filter
IF 2
Filter
LO 1
LO 2
L64780
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