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參數資料
型號: L64007
廠商: LSI CORP
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝: PLASTIC, QFP-160
文件頁數: 81/166頁
文件大?。?/td> 1015K
代理商: L64007
Arch
13 Wed May 28 17:36:23 1997
Draft 1/21/97
L64007 MPEG-2, DVB, JSAT Transport Demultiplexer Technical Manual
2-13
PRE.4 for Rev. D
Copyright 1997 by LSI Logic Corporation. All rights reserved.
implement a more sophisticated digital lter (such as a statistical median
lter) on the FErr values to eliminate jitter spikes.
The L64007 helps the host processor nd the original channel data rate
by providing a 26-bit bit/byte transport counter (the Byte Count Register
[BCR]) to lter out some of the jitter noise. The BCR stores the number
of bytes that the L64007 receives between two consecutive PCRs. The
Transport Rate Counter (TRC) counts the number of bits, and this value
is transferred to the BCR when the PCR is extracted. TRC is then reset
to zero. The host processor can use this information and PCR values to
extrapolate the intended transport rate of the data transmitted by the
upstream encoder. In principle, the difference between the intended rate
and the actual rate is the jitter noise.
Figure 2.10 shows the sampling of PCR, LMC, and FErr values in the
time domain.
Figure 2.10
Sampling PCR, LMC,
and FErr Values
T
PCR
START
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
PCR
LMCR
FErr
FFErr
12
3
4
5
6
7
where:
PCR
n = PCRn+1 - PCRn
LMCR
n = LMCRn+1 - LMCRn
FErr is dened in equation 2.1
FFErr is the ltered FErr
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