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线路调制
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  相似匹配句对
     Modulation Contrast Microscopy
     调制衬比显微术
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     the ways of modulation and demodulation;
     调制和解调的方式;
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     An Approach to CAD in Electronic Circutis
     电子线路CAD
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     The Debate of Cultural Routes
     文化线路辨析
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     Also it can modulate measured data and perform remote transmission via carrier line and telephone wir e.
     对测 量的数据进行调制,通过载波线路或电话线进行远距离传输。
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  line modulation
However, the basis and extent of this "off-line" modulation remains unknown.
      
Dose reduction in computed tomography by attenuation-based on-line modulation of tube current: evaluation of six anatomical regi
      
This study investigated the potential of attenuation-based on-line modulation of tube current to reduce the dose of computed tomography (in milliamperes) without loss in image quality.
      
We investigated a new technical approach with attenuation-based on-line modulation of tube current.
      
We compared image quality, noise pattern, and dose for standard scans and for scans with attenuation-based on-line modulation of tube current in a group of 30 radiation therapy patients.
      
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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 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.

This paper mainly discusses new development of Modem technology and technology characteristic of V. 90 X2 K56Flex based on the general analogue circuit. At same time,the paper also analyzes concretely how to optimize the performance of 56K Modem in used.

本文主要介绍了基于普通模拟线路的调制解调器技术的最新发展和V.90、X2、K56Flex的技术特点,并具体分析了如何在实际应用中优化56K Modem性能。

An implementation scheme for the line modulation based on field programmable gate array (FPGA) is proposed. Some key components, such as the FPGA implementations of cascaded integrator-comb (CIC) filter, the finite impulse response (FIR) filter and automatic gain control (AGC). The practical results show the feasibility and effectiveness of the proposed scheme.

介绍了一种电力线载波线路调制的现场可编程门阵列(FPGA)实现方案,并着重介绍了实现该方案的关键技术--积分梳状(CIC)滤波器、有限冲击响应(FIR)滤波器和自动增益控制(AGC)的FPGA实现。实践表明,该方案切实可行,具有较强的实用性。

 
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