參數(shù)資料
型號(hào)： LC72710LW
廠商： Sanyo Electric Co.,Ltd.
英文描述： Mobile FM Multiplex Broadcast (DARC) Receiver IC with On-Chip VICS Decoder(移動(dòng)FM多路廣播接收器芯片帶片上VICS譯碼器)
中文描述： 移動(dòng)調(diào)頻多路廣播（DARC）接收器集成電路片VICS解碼器（移動(dòng)調(diào)頻多路廣播接收器芯片帶片上VICS譯碼器）
文件頁(yè)數(shù)： 29/33頁(yè)
文件大?。?/td> 168K
代理商： LC72710LW
Notes on Simultaneous Reception of VICS and dGPS Data
Currently, VICS service data and dGPS service data are broadcast from different stations. Since the amount of the dGPS
data is small, 2 packets per frame, it is possible to receive both VICS data and dGPS data with a single tuner by
controlling the tuning of the receiver during the reception of mainly VICS data. During this operation, only the results of
horizontal error correction are used for dGPS data, and the VICS data that is missing due to the reception of dGPS data is
decoded (recovered) by using vertical direction error correction. (Caution: If there are any bad packets other than the
missing data, it may not be possible to recover the data.)
This IC includes functions that allow simultaneous acquisition of both VICS and dGPS data by controlling the tuning of a
single tuner. The following section describes the procedure for data reception using this function.
Notes on block and frame synchronization
circuit operation
Normally, if the block synchronization system
issues an incorrect synchronization, the count
timing of the frame synchronization counter,
which is based on the block synchronization,
changes along with that error. If this state
continues for an extended period, the frame
synchronization circuit will take this new block
synchronization timing to be correct, and
discard the timing based on the original station
A. This is the situation that occurs during
normal tuning. That is, after the time for the
frame synchronization forward protection count
has passed, frame synchronization is lost, and
then after the time for the frame synchronization
back
protection
synchronization is established with a
synchronization timing that is different from
that of station A, which had been the prior
situation. Also, even if there is a block
synchronization error for a short period, the
temporary change in the block period can cause
a timing discrepancy in the frame
synchronization counter, which is based on the
block synchronization.
count
has
passed,
This IC includes a compensation function to handle temporary incorrect synchronization in the block synchronization
circuit. What we are referring to as temporary incorrect synchronization in the block synchronization circuit is the
phenomenon shown in figure 6. Here, while the system is mainly receiving station A, the signal-to-noise ratio is
degraded for some reason and the circuit synchronizes with a timing that does not actually exist. After that, the circuit
resynchronizes with the block synchronization timing for the original station A due to, for example, improved reception
conditions. Even if such a condition occurs, the functions included in this IC allow it to actually acquire all the data that
can be acquired and furthermore, the synchronization circuit will not disrupt those conditions.
No. 6166-29/33
LC72710W, 72710LW
dGPS data
VICS data
Tuning
One frame
Frame phase
difference
Missing data
Figure 5 VICS and dGPS Data
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LC72710W 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Mobile FM Multiplex Broadcast DARC Receiver IC with On-Chip VICS Decoder
LC72711LW 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Mobile FM Multiplex Broadcast DARC Receiver IC
LC72711LW-E 制造商:ON Semiconductor 功能描述:DARC DECODE-LSI - Trays
LC72711LWHS-E 功能描述:射頻接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 類(lèi)型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel
LC72711W 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Mobile FM Multiplex Broadcast DARC Receiver IC
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