数字信号处理

The Periscope Drawtube will be bent because of the water resistance in sailing and this bend will cause the error of star measurement. Due to its especial structure, contactless measurement is the only way to measure its bend degree. First this paper introduces the method by linear array CCD based on structure and light path; Second it expatiates linear array CCD work principle and driving scheduling with example of TCD1501C and the driving circuit by CPLD. The output signal of linear array CCD includes common disturbance so the differential amplifier is needed. In order to make the signal adapt to computer processing, a threshold circuit with Schmitt characteristic and the data process following threshold are given. At last, some key problems in application are given.

潜艇潜望镜的镜筒在航行时受到水的阻力会产生弯曲变形，这种变形会造成潜艇对星体测量的误差；由于镜筒结构的特殊性，对其弯曲程度的测量只能采用非接触方法；首先从结构和光路方面介绍采用线阵CCD作为检测元件实现对镜筒弯曲程度的测量；其次以东芝公司的线阵CCD（TCD1501C）为例阐述了其工作原理及驱动时序的控制要点，并介绍了基于可编程逻辑器件的线阵CCD的驱动电路；线阵CCD输出的信号中含有共模干扰，必须采用差分放大器将其抑制；为将信号转化为适合计算机处理的数字信号，文中给出了有一定实用价值具有施密特特性的二值化处理电路及二值化后的数据处理过程；最后阐述了在实际使用中的一些关键问题。

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。

That is to say, by using the special digital converter or running relevant arithmetic, it converts the radio signal to intermediate frequency signal and completes the base-band signal process that isn"t the veriest SR and is named "software defined radio. This paper introduces the rapid system prototype into the design of software radio system, which has great advantage because rapid system prototype technology can be used to describe the future application.

由于受到硬件性能如A／D、D／A及DSP芯片处理速度的限制，目前的软件无线电系统多采用折中的实现方案，增加专用的数字变频器或者运行数字变频算法，将射频信号变频到中频，然后再进行基带信号处理，这样的软件无线电系统又被称之为"软件定义无线电"，它并不是真正意义上的软件无线电。

First use of sensors to convert the weight of voltage signal, and then voltage signal amplification input A / D converter, followed by A / D converter tool analog signals into digital signals, the digital signal will be sent to the microcontroller, through the process of Signal processing, and weighing function, and then the weight and keyboard input price multiply calculated lump sum, and the weight and price with LCD display.

首先用传感器把重量转换成电压信号，再将电压信号放大输入A/D转换，利用A/D转换工具将模拟信号转化为数字信号，将得到的数字信号传送至单片机，通过程序对信号进行处理，实现称重功能，然后将重量与键盘输入单价相乘计算出总价，并将重量和价格用LCD显示出来。

This article referred to the use of digital devices MAX6675 as a K-type thermocouple cold junction temperature compensation circuit device, through the filter, signal amplification, voltage follow to deal with output signal of the thermocouple. At the same time, it uses SCM to process the digital signal, which has been converted by A/D convert device.

本文介绍一种利用数字器件MAX6675作为K型热电偶冷端温度自动补偿电路的器件，通过滤波，信号放大，电压跟随对热电偶的输出信号进行前置处理，利用单片机对补偿后进行了A/D转换的数字信号进行处理。

In this paper,ADSP-TS201 Digital Signal Processoris adopted to design the digital intermediate frequency communication reconnoitering system.

采用ADSP-TS201高速数字信号处理器进行数字中频通信侦察系统的设计，利用DSP超高性能的处理能力以及由可编程逻辑器件FPGA支持的高速接口数据交换能力，实现了通用的通信侦察信号接收处理平台。

In this paper, a design is given for the digital intermediate frequency communication reconnoitering receiver based on TS201 digital signal processor.

本文基于TS201高速数字信号处理器进行数字中频通信侦察接收机的设计，利用DSP超高性能的处理能力以及由FPGA支持的高速接口数据交换能力，实现了通用的通信侦察信号接收处理平台。

Having studied the digital down-conversionprocess of IF signal before the base band process which follows A/D conversion in wireless communication,the paper puts forward a new idea of utilizing the FPGA to realize multi-channel digital signal DDC.Through analyzing the features and performances of CIC filters,HB filters and multiphase-filter,we combine them with decimators and decimate the A/D data,thus reducing the digital signal rate and the load of DSP when processing the base band signal.

软件无线电技术是在通用的开放式无线电智能平台上，通过安装不同的软件来完成各种通信功能，其结构的基本特征之一就是使A/D变换尽量靠近射频端，目前的方案是在中频对模拟信号进行数字化，对中频数字信号进行下变频处理，使数字信号量降低到高速DSP能够处理的程度[1]。

After this text introduced and will imitate the audio frequency signal processing as numerical signal after red shoot outside, the numerical signal that will receive again solution adjust after the audio frequency power enlarger enlarge restore in order to imitate the speech signal, shot the electric circuit outside analyzed to design the audio frequency signal before collecting the electric circuit, signal placed the big electric circuit, frequency to make the electric circuit, red, red circumscribed to accept the electric circuit,, frequency the solution adjusted the electric circuit and audio frequencies to enlarge the electric circuit etc.

本文介绍了将模拟音频信号处理为数字信号后经红外发射，再将接收到的数字信号解调后经音频功率放大器放大后还原为模拟语音信号，在分析设计了音频信号采集电路、信号前置放大电路、频率调制电路、红外发射电路、红外接收电路、、频率解调电路以及音频放大电路等各组成部分。

Aiming to solve the shortcoming in the prior art that any on-line DCF dispersion compensation technology is not provided for long distance, and the nonlinear effect in the dispersion compensation technology is restrained, the invention provides the dispersion compensation method, which includes the steps that after a sending end implements electric pre-compensation treatment on a digital signal to be transmitted, a control electric/optical converter module outputs a distorted optical signal; after receiving the optical signal, a receiving end conducts a post compensation treatment after converting the optical signal into an electric signal, or converts the optical signal into the electric signal after implementing the post compensation treatment.

为了解决现有技术中长距离无在线DCF色散补偿技术的不足和抑制色散补偿技术中的非线性效应，本发明提供了一种色散补偿方法，包括发送端将待发射的数字信号进行电预补偿处理后，控制电/光转换模块输出畸变光信号，接收端收到光信号后，将光信号转换为电信号后进行后补偿处理，或将光信号进行后补偿处理后转换为电信号的步骤。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。