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參數資料
| 型號： | L64780 |
| 廠商： | LSI Corporation |
| 英文描述： | DVB-T COFDM Demodulator(對地數字視頻廣播 正交編碼頻率分割多路處理解調器) |
| 中文描述： | 的DVB - T COFDM解調器（對地數字視頻廣播正交編碼頻率分割多路處理解調器） |
| 文件頁數： | 28/126頁 |
| 文件大?。?/td> | 953K |
| 代理商： | L64780 |
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2-10
Architectural Overview
2.7 Automatic Frequency Control (AFC)
The two methods for applying the correction required to achieve
frequency synchronization are analog and digital. The method used
depends on the design of the analog tuner. The L64780 allows both
options, which are described in the following subsections.
2.7.1 Analog Frequency Synchronization
This block adjusts the frequency of the local oscillator in the tuner so that
the center frequency of the low IF is equal to its nominal value of f
LIF
.
The adjustment must be accurate to within a small fraction of the carrier
spacing, so that intercarrier interference is kept to an acceptably low level
and the tracking ability of the channel estimation is not absorbed in
correcting for the error in the frequency of the local oscillator.
The block takes the sequence of complex numbers from the output of the
FFT block and produces a control signal for the local oscillator. This
control signal is delivered as a single-wire Sigma-Delta (
Σ/
) signal.
The initial error in the frequency of the local oscillator can be several
times the carrier spacing; the measurement of the frequency error relies
on the continual pilot carriers. The measurement range is
±
51.7 kHz in
the 8k mode and
±
143 kHz in the 2k mode. The oscillator control signal
is derived from the measured frequency error.
The value of the control signal can also be read and initialized through
the microprocessor interface, which allows a previously stored value to
be used when a channel is selected, making acquisition faster.
2.7.2 Digital Frequency Synchronization
This block uses digital signal processing (DSP) to correct for the
tolerance in the frequency of the local oscillator in the tuner. The DSP
shifts the frequency of the complex baseband signal so that its center
frequency is zero. The shift needs to be accurate to within a small
fraction of the carrier spacing so that intercarrier interference is kept to
an acceptably low level and so the tracking ability of the channel
estimation is not absorbed in correcting for the error in the frequency of
the local oscillator.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| L64782 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:L64782 Single-Chip COFDM Receiver |
| L6480 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:The L6480, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping. |
| L64801GC-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| L64801GC-25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
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