高频头

主营：机顶盒，LED照明灯，卫星接收机，放大器，光发射机，高频头，光接收机，光缆，LED显示屏，电缆。

Main products : Setop box , LED light , Satellite receiver , CATV amplifier , Optical transmitter , LNB , Optical receiver , Optical cable , LED large screen , cable .

高频头质量越好，相应的接收天线口径要求越小，成本越低。

The more good quality of the LNB , the smaller caliber and the lower cost of receiving antenna were required .

其中，QAM解调和解码功能由一体化高频头来实现。

The tuner is for QAM demodulation and error-correcting decoding functions .

电缆调制解调器中数字式8M带宽高频头的研制

Realization of 8M Bandwith Digital Tuner in Cable Modem

DVB-T移动接收系统硬件主要由DVB-T高频头、基于FPGA的TS码解复用模块和带USB2.0接口的51单片机3大部分组成。

The DVB-T mobile receive system includes three main modules : the TUNER module , the FPGA module and the USB 2.0 interface module .

ST公司的STV0399是一种用于数字卫星高频头的单芯片零中频解调和解码芯片，它包含零中频的调谐器、多规格解调和前向纠错单元。

STV 0399 of ST Microelectronics with zero-IF tuner , demodulation of various specification and Forward Error Correction ( FEC ), is a kind of single-chip zero-IF demodulator and decoder for digital satellite tuner .

设备运行中要时刻注意天线高频头、功分器、DVB接收卡的运行状态。

The equipments circulate to win to want time to notice a high frequency of receiving , splitter machine , DVB of antenna the movement appearance that receive card .

由于平板显示器仅支持逐行扫描的数字视频格式，且其分辨率也是固定不变的，所以从高频头接收下来的AV信号必须转换成平板显示器可接收的信号格式。

As a FPD normally supports only one fixed resolution of digital non-interlaced data format , the AV signal received from the TV tuner has to be changed into a fixed data format to be accepted by the FPD .

介绍了在DVB-S接收机中使用的QPSK解调高频头的方案，分析了单片高频头芯片STV0399的结构和工作原理，并介绍了软件的控制流程。

The structure of QPSK tuner used in DVB-S set top box is introduced , the structure of the CMOS tuner STV 0399 is analyzed , and the operation principle is explained . The software control flow is also introduced .

一种单片数字卫星接收机高频头方案的原理及应用

Principle and Application of a Single-Chip Tuner for Digital Satellite Receiver

计算机控制单片式数字卫星高频头软件的设计与应用

The Design and Application of Computer-controlled Single-chip Digital Satellite Tuner Software

甚高频接收测试发生器电视机高频头测试仪

Very high frequency receiver testing generator HF head tester for TV

高频电介质损耗测量仪电视机高频头测试仪

High-frequency dielectric loss measuring instrument HF head tester for TV

单片机对一体化高频头的控制；

Using MCU to control the Tuner .

正确选择卫星天线高频头

Choice Choosing Right LNBs

在高频头中的射频电平调节电路中使用了双栅极场效应管；

Employing a bigrid EFT , the modulator circuit in the rf head is designed for rf level control .

阐述了数字电视与模拟电视的区别，提出使用单高频头实现液晶数字模拟一体机的设想及设计。

Then it presents a tentative plan of the realization of LCD digital analog integrated machine by a single tuner .

高频超声小探头引导内镜下切除消化道表浅隆起性病变电视机高频头测试仪

High frequency miniature probe ultrasonography guided endoscopic mucosal resection for treatment of superficial protuberances in gastrointestinal tract HF head tester for TV

系统程序框架已形成。能够响应来自高频头的新表格到达事件，进行表格分析，生成和维护节目信息数据结构。

The system program can response to the new table arriving event , create and maintenance the Program Information Data Structure after analyzing the tables .

重点对方案的各个模块，如高频头模块，解调模块和解码模块等进行了原理，模块设计及部分硬件电路设计做了阐述。

Paper in this section focuses on the principle , structure design and some circuit design of the main modules , such as tuner , demodulator and decoder .

本文首先从整体上介绍了高频头的工作原理及技术指标，对整个高频头按照性能分为五大模块：低噪声放大器、镜像抑制滤波器、介质振荡器、混频器和中频放大器。

This paper first overall introduced the work principle and technical specification of the LNB , divided into five modules according to its performance , low noise amplifier ( LNA ), image-reject filter , dielectric resonator oscillator ( DRO ), mixer and IF amplifier .