数字信号

The theory of digital synthesizing technology and its application in arbitrary waveform generator are introduced. A arbitrary waveform generator and its software are designed and tested.

介绍了直接数字合成技术的原理及其在任意波形发生器上的应用，设计了任意波形发生器和多类信号的混合发生软件，并对任意波形发生器的性能进行了测试。

Since digitized multi-media information especially the figure video frequency and audible signal data are special ample,if we don't carry out effective compression, it can be difficult to get actual application.

由于数字化的多媒体信息尤其是数字视频、音频信号的数据量特别庞大，如果不对其进行有效的压缩就难以得到实际的应用。

So, we combine CobraNet audio network technology, data transmitting technology, MCU technology and FPGA technology to develop interface and program of MCU, controlling PCB board, A/D converter PCB board, D/A converter PCB board, digital audio receive PCB board. At last, we construct a audio network and test it's performances.

本文紧密结合CobraNet 音频网络技术、数据传输技术、单片机技术和FPGA 技术，从事了单片机接口及控制程序设计、控制板设计、A/D 转换插卡设计、D/A 转换插卡设计、数字音频信号收发插卡设计，开发出了一系列音频网络设备，并组网测试。

Furthermore, The frequency-domain relationship between the electric flux density and the electric field is managed with the Z transform, which is of frequent use for digital filtering and signal processing. The optical pulse propagating in nonlinear and dispersive media is analyzed with Z transform, which is simpler than with auxiliary differential equation method.

同时利用数字滤波和信号处理中经常使用的Z变换来处理D和E间的频域关系，并具体分析了如何用Z变换法来处理非线性色散问题，此方法与辅助差分法相比要较为简单明了。

In this paper, digital baseband transmission system to a simple description, Channel Signal Processor of which are part of a focused on.

本文首先对数字基带传输系统进行了简单的描述，并对其中关于信道信号形成器的部分进行了着重讲解。

One of the most important issues of pulse position modulation for optical wireless communications is the receiver symbol synchronization subsystem, in this paper, the basic principle of symbol synchronization for PPM sequence is discussed, and the upper limit of exact synchronization probability for random PPM sequence is analyzed.

讨论了PPM序列的符号同步原理；在分析随机PPM序列的精确符号同步概率上限的基础上，给出了一种在PPM序列中插入同步信号来实现PPM精确符号同步的方案及其数字逻辑电路实现。

By computer simulation with convolution sum of FIR digital filter, the results show that the model is the same as traditional binary coding arithmetic, which can be used in chaotic signal processing systems.

通过FIR数字滤波器卷积和操作的计算机数值仿真表明，采用这些方法运算得到的结果与传统二进制算术编码算法完全等效，可应用于混沌信号处理系统。

Bit sound card is the sound card in the collection and to play a sound file by the use of digital voice signals in a binary digit.

声卡的位是指声卡在采集和播放声音文件时所使用数字声音信号的二进制位数。

A music cassette is chosen as the mother-tape. New and re-used blank tapes are recorded or transcribed as the son-tapes using two different cassette duplicators.

选择一盘原音带作为母带，分别将出厂空白带和使用过的空白带在2台复录机上录制或转录为子带，经计算机声卡采集，磁带音频信号转换为数字音频文件。

This paper precisely conducts the special topic research in view of some important technologies of the digitized control module.(1) AC motor control circuit of PAN/TILT is designed ,which speed is controlled by AT89C51 MCU. DC motor control circuit of LENS is designed too.(2) The hardware and software of automatic temperature control is designed, which used in camera protect box without A/D IC. A kind of single wire communication IC is used in the circuit. So, the program is given.(3) A method of video switch without picture shock is discussed in this paper, and 16x8 video switch circuit is designed. AT89C51 can carry out time sequence logical control with the sync signals by request..(4) The module of real-time clock is designed, in which, LCM is used, a kind of three-wire communication IC is used too.

1给出了一种由89C51单片机控制的简单易行的交流云台转动变速控制电路，实现了云台及其电动三可变镜头的控制；(2)给出了无需外加A/D、单线通信的防护罩自动温度控制电路，完成了单片机温度控制软件的设计；(3)提出了"无抖动"视频切换的设计思想，给出了16×8的视频切换电路，利用单片机在视频信号的场消隐期控制切换，从而实现了"无抖动"切换；(4)给出了一种三线接口通信的液晶显示实时时钟电路，完成了程序设计；(5)提出了在视频监控系统数字控制模块中，用CAN总线取代传统的RS-485总线，实现PELCO-P协议传输的方案。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。