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參數(shù)資料
| 型號(hào)： | L64780 |
| 廠商： | LSI Corporation |
| 英文描述： | DVB-T COFDM Demodulator(對(duì)地?cái)?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(duì)地?cái)?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(yè)數(shù)： | 32/126頁(yè) |
| 文件大?。?/td> | 953K |
| 代理商： | L64780 |
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2-14
Architectural Overview
2.9 Mode Control Logic
If previously stored mode data are available, they are used when a
channel is selected or when the signal strength rises after a period of
signal loss. This is done by the means of an external microprocessor and
makes acquisition faster. When the Mode Control Logic becomes an
error-free TPS block, mode data from that TPS block replaces any
previously determined mode data.
In this context, the mode data consists of:
2 k or 8 k mode
Length of the guard interval
Modulation system
Hierarchy information
Inner code rate
The mode control logic configures all the demodulator blocks whose
operation is affected by these parameters. Acquisition of the demodulator
is outlined in the following steps:
1.
Achieve full synchronization of the FFT start and the clock frequency.
2.
Make coarse and fine automatic frequency control (AFC) corrections,
and achieve frequency synchronization.
3.
Equalize the channel frequency response, once the Symbol Number
is zero.
4.
Wait up to one frame for the start of a TPS block, and wait another
frame for the complete TPS block to be received. There is a wait of
one or more additional frames, if necessary, until a TPS block is
received without errors.
5.
The modulation system, hierarchy information, and code rate from
the TPS data are used to configure the Viterbi metric assignment
block, and, by means of the microprocessor interface, the external
Viterbi decoder(s).
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| L64781 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Chip COFDM Receiver |
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