theory n. 1.理论,学理,原理。 2.学说,论说 (opp. hypothesis)。 3.推测,揣度。 4.〔口语〕见解,意见。 the theory of two points 两点论。 Darwin's theory of evolution 达尔文的进化论。 theory of equations 【数学】方程论。 theory of everything 【物理学】(把相对论、量子论和宇宙大爆炸理论都包括在内的)万用理论。 theory of relativity 【物理学】相对论。 the atomic theory 原子说。 Our scheme is good both in theory and in practice. 我们的方案在理论上和实施上都是好的。 combine [separate] theory with [from] practice 理论结合[脱离]实际。 My theory is that we must bring new blood into the Institute through appointment of younger men to important positions. 我的意见是我们学院应该通过重用年轻一些的人来注入新的血液。 theory of games 博弈论,对策论,权衡利弊得失的形势分析。
At present , the most of vtr which are used in watch - control occasion for speciality are short of a uniform control - check - alarm system , which brings on the discommodiousness of operation and the user can not know the time of occurring a fault , which reduces the reliability of the watch - control system . therefor , at first , i carefully analyze the servo theory of the vtr which had been produced by chmavc with k mechanism to find out the work rule of the control signal ; second , take out some right control signal ; then for dealing with the problem of vtr in use for watch - control , i choose some right components to design the uniform control system for many special vtr with protel software . it mainly includes the following functions : operation functions of all vtr ( for example : power , play , ff , rew , stop , rec , eject , fwd , rwd , sp , lp ) was controlled by line at the same time ; in , the process of recording , when the tape walks to the end or stops by itself , the system gives an alarm and shows the number of the wrong vtr ; in the process of recording , the system gives an alarm and shows the number of the wrong vtr when the video signal from vidicon is losed ; the system controls all vtr to record on the non - working time when there is something wrong in the guarding section ; the system controls the video from vtr to switch to right monitor 目前,用在监控场合的业务用录像机普遍缺乏一个统一的控制及检测报警系统,这就导致了操作的不方便和出现了故障用户不知道,降低了监控系统的可靠性,为此,我首先对华录松下生产的k机芯的录像机伺服原理进行仔细分析,找出各个伺服控制信号的控制变化规律;然后从中选出合适的控制信号;针对目前录像机在实际监控使用过程中存在的问题,选用合适的元器件;运用protel绘图软件,设计了这个多台业务用录像机的统一控制系统,她主要包括以下功能:录像机操作功能(如power play ff rew stop rec eject及正寻反寻带速设定等)的统一线控控制功能;磁带在记录过程中,磁带到头和磁带自己“偷停”的报警,并要能显示出具体是哪一台录像机;在记录状态下,摄像头输入信号丢失报警,并要能显示出具体是哪一台录像机;在休息或其他不需要记录时,一旦警戒区有情况,则控制所有机器自动进入录像状态的功能;从录像机输出的监控图像信号对监视器的切换功能。