系统通过中频电路板实现对信号的放大和滤波等作用。
The if circuit board deals with the signal amplification and filtering functions.
基于感应加热研究现状，利用微机对中频电源控制电路实现了数字化。
On the basis of the study situation of induction heating, the digitization of the rectification control circuits of medium frequency power supply is achieved by using microcomputer in this paper.
该电路具有低功耗、增益可调范围宽和频率范围宽的特点，适用于一般的中频接收机。
This circuit has the characteristics of low power, wide gain adjustable range and wide bandwidth.
其主电路采用全桥式拓扑结构，以IGBT管为功率开关器件，中频变压器使用微晶磁心。
Full bridge topology was used in the main circuit, IGBT was used as power switching device, and micro-crystal core was used in mid-frequency transformer.
中频部分主要由HFA3724正交调制解调器和基于MB1502的锁相频率合成电路等组成。
The intermediate frequency circuit includes QPSK modulation based on HFA3724, PLL circuit based on MB1502.
介绍一种通用CAN节点的电路结构、相关应用程序及在工业中频感应加热设备控制现场总线中的应用。
An introduction to the circuit structure and program of universal CAN node as well as the application in inductive heating.
介绍一种新的晶闸管中频电源启动电路。
A new thyristor medium-frequency power supply startup circuit is introduced in this article.
文章对收发系统的射频电路及本地天线单元的中频信号处理方法作了较为详细的介绍。
The radio frequency (RF) circuits of the transceiver and the intermediate frequency (IF) signal processing methods of the LAU are all given a more detailed description in this paper.
传感器输出的检测信号是中频的正弦电压信号，为采集和处理该信号，设计了以P89C51RD2单片机为核心的数据采集器电路。
The output signal of the sensor is the sinusoidal signal with intermediate frequency. To sample and process this signal, a data collection circuit that centers on P89C51RD2 single chip is designed.
介绍了在可控硅中频感应电炉中整流电路和逆变电路的常见故障及其排除方法。
The common breakdown and its removal of the rectifier circuits and inverse transforming circuits in intermediate frequency induction electric furnace for thyristor are introduced.
本文采用TI公司的TMS320 LF 2407a型DSP芯片设计了一种中频逆变电源，对电源主电路实现了全数字控制，提高了输出电压的精度和稳定度。
This paper I use TI's DSP chip design TMS320LF2407A type, a frequency inverter, I realized the main circuit power supply digital control, and improved output voltage accuracy and stability.
基于TA7680设计了中频放大和检波电路。
It designs the if amplifier and demodulation circuit based on TA7680.
针对晶闸管中频电源的核心——逆变电路，提出了一种基于80c 196MC单片机的控制电路，给出了其构思的硬件和软件设计。
This paper introduces a new inversion control circuit based on 80c196mc microcontroller for thyristor medium frequency power supply. Meanwhile the hardware and software designs are also provided.
本文分析了电视机检波电路的原理，从理论上说明了伴音第一中频应吸收的强度，以使图象不受伴音干扰。
This article analyses the principle of detecting circuit in TV receiver. and explains theoretically the correct absorption of first sound IF so as to keep the sound from interfering the picture.
用分布参数电路模型对稠油油井中频加热功率沿井深的分布进行了深入研究。
The power distribution of heavy oil well along well-bore in medium-frequency heating is investigated by means of distributing parameter circuit model.
摘要 ： 对中频感应加热负载及其等效电路、振荡回路进行了分析，同时结合三种典型负载提供了一些经验数据。
Abstract :The author analyzes the loads of medium frequency induction heating and their equivalent circuits and resonant tanks, and presents some experience data of three typical loads.
接收机采用零中频直接变频方案，电路简化，可有效地降低成本。
The zero IF technology is used in the receiver which can simplify the reader circuit and reduce cost significantly.
该电路采用二次变频低中频结构，集成了低噪声放大器、上变频混频器、下变频混频器等模块。
An RF front-end circuit for a fully integrated CMOS DTV tuner is presented in this paper, where double-conversion low IF architecture is employed.
子电路包括低噪声放大器、射频滤波器、混频器、驱动放大器、功率放大器、中频滤波器等。
The subcircuits consist of the low noise amplifier, RF filter, mixer, driver amplifier, image filter, power amplifier, transmit-receive switch and if filter and so on.
本文的内容主要分为六章，分别阐述了晶闸管中频感应电源的工作原理、主电路设计、控制策略、控制系统实现、试验结果和结论。
This paper is divided in six chapters, including the medium frequency power supply of thyristor's theory, design, regulation strategy, control system, experiments and conclusion.
通过对某种型号电动自行车调速控制器的剖析及试验，找出了原控制器使用过程中频繁烧坏功率场效应管的原因，研制出了一种改进型控制器电路，从根本上解决了原电路存在的问题。
Analysis and test of speed controller circuit of certain electric bicycle is performed to find out the reason for a frequent burn-out of power FET of the original controller during working.
文中提出了基于直接中频采样的数字化GPS接收机码捕获电路。
A digital GPS PN code acquisition circuit based on direct IF sampling is presented.
本文研究表明在卫星定位导航系统中使用中频数字化的软件无线电结构是可行的，同时大大简化了用硬件对接收的卫星信号进行处理时电路的复杂性。
The study of this paper indicate that the application of digital IF Software Radio framework is practicable in the receiver of the Satellite Positioning and Navigation system.
通过对某种调速控制器的剖析及试验，找出了原控制器使用过程中频繁烧坏功率场效应管的原因，斫制出了一种改进型控制器电路，从根本上解决了原电路存在的问题。
Analysis and test of speed controller circuit of certain electric bicycle is performed to find out the reason for a frequent burn-out of power FET of the original controller during working.
简述并联振荡电路特点以及感应加热淬火用SCR 晶闸管中频电源调谐方法等。
This thesis sketchs out characteristics of parallel oscillatory circuit and tune means of KGPS applied in Induction quenching.
详细说明：TDA9321H芯片驱动程序，TDA9321H是飞利浦公司一款视频信号处理芯片，彩电中频处理/多制式解码电路。
TDA9321H chip driver, TDA9321H Philips is a video signal processing chip, color TV IF processing/multi-standard decoding circuitry.
接收电路采用了零中频方式，相对于超外差方式，明显简化了电路结构，仅由混频器、差分放大器和电压比较器组成；
Receiving Circuit adopts the zero-IF, only consists of the mixer, differential amplifiers and voltage comparator, compared to super heterodyne, obviously simplifies the structure of the circuit;
接收电路采用了零中频方式，相对于超外差方式，明显简化了电路结构，仅由混频器、差分放大器和电压比较器组成；
Receiving Circuit adopts the zero-IF, only consists of the mixer, differential amplifiers and voltage comparator, compared to super heterodyne, obviously simplifies the structure of the circuit;
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