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信号
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  signal
    The Submicron GaAs PHEMT Device and its Small Signal Modeling
    亚微米GaAs PHEMT器件及其小信号建模
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    I.Expressions for signal and background induced noise with space filters,IEEE Trans
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    Infrared tracker error signal generation and processing system
    红外跟踪器误差信号产生及处理系统
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    The Freguency Spectrum Purity Analysis for an Output Signal of a Digital Frequency Synthesizer
    数字式频率合成器输出信号频谱纯度的分析
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    SYNCHRONOUS INTEGRATOR——A METHOD OF EXTRACTING WEAK SIGNAL FROM NOISE
    同步积分器——噪声中提取微弱信号的一种方法
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  signals
    A Closed-loop Automatic-Gain-Control System for Signals Having Rapid Change in Average Strength
    一种用于信号强度快速变化情况下的自动增益控制回路
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    The Calculations of The Beat-photocurrent Signals in The Fiber Optic Sensors
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    SELF-TUNING DECONVOLUTION FILTER FOR NONSTATIONARY ARMA SIGNALS
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  signal
In the early 1960s research into radar signal synthesis produced important formulas describing the action of the two-dimensional Fourier transform on auto- and crossambiguity surfaces.
      
It is shown that the one-dimensional sampling sets correspond to Bessel sequences of complex exponentials that are not Riesz bases for $L^2[-R,R].$ A signal processing application in which such sampling sets arise naturally is described in detail.
      
Given a bandlimited signal, we consider the sampling of the signal and some of its derivatives in a periodic manner.
      
We present a method for finding the dual frame and, thereby, a method for reconstructing the signal from its samples.
      
We show that if no sampling of the signal itself is involved, the sampling is not stable and cannot be stabilized by oversampling.
      
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  signals
They are potential tools for the decomposition and handling of signals that, like speech or music, seem over short intervals to have well-defined frequencies that, however, change with time.
      
Multiresolution Analysis and Multivariate Approximation of Smooth Signals in CB(Rd
      
Frame Analysis of Irregular Periodic Sampling of Signals and Their Derivatives
      
Unique reconstruction of band-limited signals by a Mallat-Zhong wavelet transform algorithm
      
The radar ambiguity function plays a central role in the theory of radar signals.
      
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Analysis of the low frequency response of automatic balancing D-C amplifier with mechanical chopper is illustrated by a typical circuit in this paper. The analysis of dynamic response of the modulation and the demodulation circuits and the auxiliary carrier wave amplifier have been considered more in details. The analysis is based on solving difference equations since the intrinsic working process behaved by the M-D M circuits using mechanical chopper is more accurately described by difference equation other...

Analysis of the low frequency response of automatic balancing D-C amplifier with mechanical chopper is illustrated by a typical circuit in this paper. The analysis of dynamic response of the modulation and the demodulation circuits and the auxiliary carrier wave amplifier have been considered more in details. The analysis is based on solving difference equations since the intrinsic working process behaved by the M-D M circuits using mechanical chopper is more accurately described by difference equation other than by differential equations.

本文結合一个典型线路对带有机械振子的自动稳零直流放大器的低頻特性,进行了分析,并且着重分析了調制解調輔助放大器对緩变信号的频率响应。所用方法是差分方程求解法,因为用差分方程来描述具有机械振子的調制解調线路的固有工作过程,要比用相同的初始条件的微分方程来描述更为准确。文中推导出調制及解調綫路的調制系数k_M、解調系数k_(ДM)以及它們的传递函数。此外,对放大調制波的阻容耦合放大器也进行了分析。分析結果說明,如果放大器耦合迴路的参数选择得合理吋,則此放大器对緩变信号的調制波可作为理想放大器来处理。文中所得結果可作为設計該类型放大器时选择参数的参考。此外,本文对于采用自动稳零直流放大器作运算放大器时可能产生的持續低頻自激振蕩問題,也进行了討論。

Analysis of the low frequency response of automatic balancing D-C amplifier with mechanical chopper is illustrated by a typical circuit in this paper.The analysis of dynamic response of the modulation and the demodulation circuits and the auxiliary car- rier wave amplifier have been considered more in details.The analysis is based on solving difference equations since the intrinsic working process behaved by the M-D M circuits using mechanical chopper is more accurately described by difference equation other...

Analysis of the low frequency response of automatic balancing D-C amplifier with mechanical chopper is illustrated by a typical circuit in this paper.The analysis of dynamic response of the modulation and the demodulation circuits and the auxiliary car- rier wave amplifier have been considered more in details.The analysis is based on solving difference equations since the intrinsic working process behaved by the M-D M circuits using mechanical chopper is more accurately described by difference equation other than by differential equations. In this paper,the modulation and demodulation coefficients kM and k of the M-D M circuits and their transfer functions are derived.Besides,an analysis is given to the R-C coupled carrier amplifier and the obtained result tells us that if the parameters of amplifier are exactly choiced,the conventional type low frequency A-C amplifier may be considered as ideal amplifier as to the amplification of modulated wave amplitudes. The results derived in the paper may be used as a guidance for selecting parameters in design such type D-C amplifiers. Selfexcited low frequency oscillation of the automatic balancing D-C amplifier used as a computing operational amplifier is discussed.

本文结合一个典型线路对带有机械振子的自动稳零直流放大器的低频特性,进行了分析,并且着重分析了调制解调辅助放大器对缓变信号的频率响应.所用方法是差分方程求解法,因为用差分方程来描述具有机械振子的调制解调线路的固有工作过程,要比用相同的初始条件的微分方程来描述更为准确.文中推导出调制及解调线路的调制系数 k、解调系数 k 以及它们的传递函数.此外,对放大调制波的阻容耦合放大器也进行了分析.分析结果说明,如果放大器耦合回路的参数选择得合理时,则此放大器对缓变信号的调制波可作为理想放大器来处理.文中所得结果可作为设计该类型放大器时选择参数的参考.此外,本文对于采用自动稳零直流放大器作运算放大器时可能产生的持续低频自激振荡问题,也进行了讨论.

Summary This paper discusses the circuit synthesis and development technique of a transistor pulse synchronized frequency division system.It consists of many ele- mentary pulse networks such as:Transistor forming and shaping circuit,trrnsistor blocking oscillator,multivibrator,time delay circuit and “and” gate,etc.The master signal of this system is supplied from a 100—KC/S crystal controlled oscillator.With the use of many stages of both-side synchronized frequency di- viders,the system simultaneously delivers...

Summary This paper discusses the circuit synthesis and development technique of a transistor pulse synchronized frequency division system.It consists of many ele- mentary pulse networks such as:Transistor forming and shaping circuit,trrnsistor blocking oscillator,multivibrator,time delay circuit and “and” gate,etc.The master signal of this system is supplied from a 100—KC/S crystal controlled oscillator.With the use of many stages of both-side synchronized frequency di- viders,the system simultaneously delivers stable sharp pulses of 100—KC/S, 10—KC/S,1—KC/S and 100—C/S repetition frequency.The duration of each pulse of the lowest repetition frequency is about 0.4μs,and shorter for the high repetition frequencies.The amplitudes of the pulaes of the different repetition frequencies are more than 3 volts.The resulting phase shift and drift instability of the cascade synchronized frequency dividers are eliminated by pulse selection method in this system,Hence the output pulses are accurately positioned in time relative to each other.Test results coincide fairly well with theoretical analysis.

在精密的时间测量系统中,为了获得严格的定时同步脉冲,必须消除多级分频器所产生的误差,因而需用比较复杂的分频系统。本文专门讨论了利用脉冲选择的晶体管化同步分频系统的线路综合原理和研制技术问题,对组成系统的各种单元脉冲电路,如晶体管窄脉冲形成器,晶体管间歇振荡器,晶体管多谐振荡器,晶体管延迟电路以及晶体管门电路等均作了较深入的分析,并给出相应的实验结果。系统的主振信号是由一100千赫晶体稳频的振荡器产生,通过多级脉冲选择的双侧同步分频电路,可以同时获得稳定的100千赫,10千赫,1千赫及100赫等重复频率同步窄脉冲,同步脉冲的宽度为0.4微秒,幅度大于3伏。实验结果与理论分析基本上是一致的。

 
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