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    A Research in Tracking Range of the TV Guidance Systems
    提高TV制导作用距离的方法研究
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    Theory and Method of Heightening Frequency Resolving Precision Based on Classical Spectrum
    基于经典谱估计的提高频率分辨精度的理论和方法
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    Several Measures for Enhansing Transmission Rate of Optical Fibre in SDH System
    SDH系统中提高光纤传输速率的几种措施
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    The effect of the link layer retransmission schemes of CDMA2000 on TCP performance was mainly studied. An adaptive retransmission scheme over CDMA2000 wireless link layer was put forward.
    主要研究了CDMA2000中链路层重传技术对无线TCP数据传输的影响,并结合TCP层重传超时机制,提出了一种新的自适应链路层重传算法,提高了TCP在无线链路的数据传输性能。
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    The software in 89C51 outputs the data to LED screen continuously. EPM7128SLC8,that integrates the peripheral interface logic unit to the LED screen,implements the function of shifting data and row scanning. It lightens the tasks of 89C51.The new design is flexible and steady,and the new Control-board refreshes faster than the old mode.
    EPM7128SLC8代替89C51的外围电路,实现点阵码移位和行扫描功能,减轻了CPU的处理任务,设计灵活、可靠,使刷屏率比普通的LED显示控制板明显提高.
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The time lag due to the backlash of the regulator and the heat fluetuation of the heater were diminished by the following two improvements. (1)The regulator (murcury thermo-expansion type) is put into constant vibration by placing it near the motor of the stirrer to diminish the backlash of murcury column. (2)The switch of the relay is shunted by several lamp resistances, so that the heater maintains constant heating with lesser power when the relay switch is in the“off”position,but with full power rating...

The time lag due to the backlash of the regulator and the heat fluetuation of the heater were diminished by the following two improvements. (1)The regulator (murcury thermo-expansion type) is put into constant vibration by placing it near the motor of the stirrer to diminish the backlash of murcury column. (2)The switch of the relay is shunted by several lamp resistances, so that the heater maintains constant heating with lesser power when the relay switch is in the“off”position,but with full power rating when the relay switch is in the“on”position. As a result,the precision of control of temperature of a thermostat may be improved more than 10 times. At room temperature of 20-30℃ and thermostat temperature of 40℃,the variation of reading of the Beckmannthermometer (estimate reading 0.002℃) can not be observed.

在普通的恒温器中加以下列二改进,可以减小由于调节器迴差及加热器热量起伏所引起之时滞,提高精密度达10倍以上。在室温20—30℃,槽温40℃可维持柏克曼温度计(估计0.002℃)读数不变(±0.001℃以上)。改进:(1)由电动搅拌器使调节器(汞膨胀式)产生振动,可以减小汞柱迴差。 (2)在替续器之加热开关上并联电阻,使有一定功率经常加热,可以减小热量起伏。

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这篇試驗报告的内容分三部分:1.电传机內在畸变的校正,2.双音調通信,3.調幅制載波电报改裝为移頻制。我国目前使用的电报設备中,电传机和調幅制載波电报机占很大的比重,这两項設备工作性能的优劣和电报通信的質量有密切的关系。存在的間題是:1.电傳机依照說明書的规定和凭工作人員的经驗不易調整到理想的狀况;2.調幅制載波电报設备不能耐受电平的突然波动,如果电传机調整得不够理想,以及通信时电平发生突然的变动,就会产生变字,在通信中造成技术性的差错,降低了电报的質量。这里第一部分敘述一个計算电传机内在畸变的方法,从計算出的各項內在畸变的数值,可以迅速地將电传机調整到比較理想的狀况;第二部分是講將两个調幅通信路作为一路使用,以提高对于电平突然波动的耐受能力;第三部分是关于直接將一个調幅通信路改裝为移頻制,既可得移頻制能耐受电平突然波动的优点,又可不致浪費使用通信路,一个通信路仍可进行一路通信。一、引言二、电传机內在畸变的校正三、双音調通信四、調幅制載波电报改裝为移頻制

In this paper the information transmitting rate of delta-modulation (△M) system is discussed and compared with PCM system. It points out that the principal way of increasing the information rate is to decorrelate the modulating signal. The formulae of computing the signal-to-noise ratio of single integration and double integration delta-modulation systems are given. The signal-to-noise ratios and thier relations to pulse repetition frequency for both systems are calculated with typical modulating signal and...

In this paper the information transmitting rate of delta-modulation (△M) system is discussed and compared with PCM system. It points out that the principal way of increasing the information rate is to decorrelate the modulating signal. The formulae of computing the signal-to-noise ratio of single integration and double integration delta-modulation systems are given. The signal-to-noise ratios and thier relations to pulse repetition frequency for both systems are calculated with typical modulating signal and the results are compared with PCM system. The views in the problem of compression-expansion with practical meaning for both PCM and △M systems are presented. The △M system is reviewed from the point of view of information theory.

本文将△调制与脉码调制进行了对比,讨论了信息率,并指出提高信息率的主要方向是解除信号前后的相关性;给出了计算一级和两级积分△调制系统的信噪比的公式;通过典型调制信号计算了信噪比及这个比值与脉冲重复频率的关系,并将所得结果与脉码调制作了比较;文中对两种调制系统中的压缩扩张问题提出具有实践意义的意见;从信息论的观点评论了△调制系统。

 
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