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參數(shù)資料
| 型號(hào)： | VES1820X |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Single chip DVB-C channel receiver(單片DVB-C頻道接收器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | MQFP-100 |
| 文件頁數(shù)： | 34/40頁 |
| 文件大小： | 182K |
| 代理商： | VES1820X |
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1999 March 01
34
Philips Semiconductors
Product specification
Single chip DVB-C channel receiver
VES1820X
FRAME SYNCHRONIZATION
Frame synchronization is performed at the output of the demodulator to both synchronize the Forney convolutional
de-interleaver and to determine the boundaries of the Reed-Solomon blocks.
MPEG2 transport packets consist of 204 bytes: one sync byte (as the first byte of the packet), 187 data bytes, and
16 redundancy bytes. The sync byte is used in frame synchronization.
The frame synchronization state machine operates in two phases:
Acquisition Phase. When
α
consecutive sync bytes (or
sync
bytes) are detected, the output signal FSYNC
goes high and the state machine switches to the Tracking Phase.
Tracking Phase. When
β
consecutive sync bytes (or
sync
bytes) are missed, the output signal FSYNC
goes low and the state machine switches back to the Acquisition Phase.
(See
FIGURE 16 page 35
for details of the state machine operation).
The parameters
α
and
β
are programmable via the I2C interface. The following table shows the value of the
parameters as a function of C[1:0]:
C[1]
0
0
1
1
C[0]
0
1
0
1
a
5
5
6
6
b
6
8
10
15
PERFORMANCE
The following table shows an example of frame synchronization algorithm performance. Computed values for
maximum average re-frame time (TRF), the meanframe misalignment time (TMF) and the probability of false
alignment (PF) are given as a function of the BER at the output of the demodulator output in the case of :
α
= 5 and
β
= 8.
BER
Acquisition
(
α
= 5)
Procedure
Tracking
Proce-
dure(
β
= 8)
T
MF
(fra-
mes)
9.15X103
8.54X108
1.83X1011
6.18X1016
1.15X1019
5X10-2
10-2
5X10-3
10-3
5X10-4
T
RF
(fra-
mes)
69 .95
15 .97
P
F
1.15X10-8
2.22X10-9
1.81X10-9
1.54X10-9
1.51X10-9
13 .47
11 .78
11 .59
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