模拟到数字

this paper introduces a lossless detected circuit system.firstly,system gathers slender infrared signal with transducer,then amplifies them with low noise.through voltage comparator circuit,transforming simulation objection signals to digital signals.finally,transforming transport landscape orientation and portrait to single chip processing.in design of pcb,the amplifying of quadruplet signal,filter,voltage comparator decree and and logic function are manufactured in one board.if the diameter of workpiece is long,it can add multiple the number of transducer of four,to wide its range of practice,disposing circuit only need one module.

摘 要：介绍了一种无损检测的电路系统。系统首先利用传感器采集到微弱的缺陷信号，再将缺陷信号进行低噪声放大，然后通过电压比较判决电路将模拟缺陷信号变换成数字信号，最终将横、纵两路的输出信号送至单片机处理。在pcb设计中，将四路信号的放大、滤波、电压判决以及与逻辑功能做在一块板上，若被检测工件的直径较大，可以将传感器的个数以四的倍数增加，处理电路只需增加一个模块。

It can complete the measurement of AC/DC voltage.The running process: it enlarges the digital to tallies chip through Amplifier. It holds the sampling digitalpass to convenience transforming for the chip through sample and hold Circuit.

运行过程是：将采样的模拟量通过放大电路放大到和模数转换芯片相适应的量，通过采样保持电路将芯片采样的量保持住后送入模数转换器转换成数字量，再由单片机进行控制计算。

It can complete the measurement of AC/DC voltage. The running process: it enlarges the digital to tallies chip through Amplifier. It holds the sampling digital pass to convenience transforming for the chip through sample and hold Circuit.

运行过程是：将采样的模拟量通过放大电路放大到和模数转换芯片相适应的量，通过采样保持电路将芯片采样的量保持住后送入模数转换器转换成数字量，再由单片机进行控制计算。

As the beginning of this thesis, the important meanings of sea ice to global climate change and ocean engineering in polar and subpolar sea regions are explained firstly. Then, it is pointed out that sea ice numerical modelling, as a powerful tool of sea ice research, is limited by the precision of parameters within models instead of itself so far. It is meaningful to study the important parameters of sea ice dynamics by means of the rapidly developing digital imaging techniques so as to provide better input parameters needed in numerical models.

文中首先阐述了海冰对全球气候变化和极区、亚极区海域海洋工程问题的重要性，并指出作为海冰研究重要手段之一的海冰数值模拟发展到目前，其准确性更加受到海冰参数而非模式本身的限制，因此以目前快速发展的数字图像技术为工具对海冰动力学过程中的重要参数进行研究，以提供数值模式所需要的高精度和准确性的数据，是非常有必要的。

The theory involves a wide range of knowledge to students ' understanding of one's knowledge is everything, so the part of the process can be simplified, as long as the students to master water roll and roller sport is multi-analog, transformed into digital input after

这个理论涉及到多方面的知识，以学生的知识面是无法全部理解的，因此讲解该部分可将过程简化，只要学生们掌握水辊和墨辊的运动是模拟量，转化成数字量后输入

Using triple integral equation based on scalar Green function for forward modeling transient electromagnetic response to a 3 D anomalous body, a frequency response of electromagnetic field component has been evaluated first on frequency domain, then the evaluated results has been transformed into time domain by using fast numeric filtering algorithm.

用基于张量格林函数的体积分方程对三维异常体进行瞬变电磁响应的正演模拟，首先在频率域内计算电磁场分量的频率域响应；然后利用快速数字滤波技术将计算结果转换到时间域。

An internal two-bit digital to analog converter provides programmability of the output currents.

一个内部2位数字到模拟转换器提供的输出电流的可编程性。

Because be in major case, final inductor is human ear, accordingly we need to try measured outcome to adjust, in order to accord with auditive mode.

传统上，减轻滤波器是操作模拟元件设立的，可是，SVT供给了从时候到频率资料的数字减轻滤波器。

A digital image -based technique was proposed to characterize and quantify the heterogeneity of rock, and it was implemented into RFPA code in order to simulate the complete failure process of rock under both the exter

本文提出了用数字图像处理技术表征岩石非均匀性的基本方法，并通过把该技术实施到岩石破裂过程分析程序RFPA中，来模拟非均匀岩石在外载荷和渗流耦合作用下发生破裂的整个过程。

The photoelectric detector changes the optical signal after receiving the electric signal, and then produces the binary code through A/D converter. The computer make the fuzzy deal according to the data; Finally, the computer sending out the orders of going forward or backwards shiftily, opening or closing the machine.

光电器件接收到光信号后转换成模拟电压信号，经A/D转换后产生二进制数字量，由微机读入后结合该值变化速率进行模糊处理，最后发出变速前进、变速后退及开机、关机命令，从而控制印刷品或制袋的运动及变速偏移，使彩色套印或分切制袋能准确正常地进行。

This paper analyzes the compound attractor structure of a new three-dimensional autonomous chaotic system.

分析了一种新的三维自治混沌系统吸引子的复合结构。

ON shut rivals out of their transmission systems and shy away from reinvesting their profits in network improvements.

ON将竞争者挡在了其输送体系之后，并不愿将其收益再投资于网络改建工作。