数字信号

Set-top-boxes receive and transform digital TV signals into the signals which analog TV sets can display.

机顶盒用于在数字电视系统中将数字信号转变为模拟电视可以接收的信号，它是数字电视的过渡性产品。

With the explosive development of communication and digital signal processing technology, an analog-to-digital converter, as an interface between analog signal and digital signal is necessary.

随着通信技术和数字信号处理技术的快速发展，作为模拟信号与数字信号界面的模数转换器得到了越来越广泛的应用。

Digital filter digital signal processing is the most important part of almost all in the digital signal processing systems.

数字滤波器是数字信号处理中最重要的组成部分之一，几乎出现在所有的数字信号处理系统中。

First, mathematical foundation of synchronization, i.e. the theory of parameter estimation is introduced. Then, DA/DD or NDA timing synchronization methods based on the ML estimation of timing parameter are presented. They are all widely applied in actual digital communication systems. Interpolation theory in digital signal processing has application in timing synchronization, which makes the sampling clock independent of the timing control so that timing adjustment is realized completely through digital disposal. The issue of interpolation in timing synchronization is discussed.

首先，介绍了定时同步实现的数学基础，即信号参数估计理论；从定时参数的最大似然估计出发，介绍了基于数据辅助的定时同步方法和基于非数据辅助的定时同步方法，他们在实际的数字通信系统中均有广泛应用；论文探讨了数字信号处理中插值理论在定时同步中的应用，它使得接收端的采样时钟独立于定时控制，定时调整完全通过数字处理方法得以实现。

In the development of the home's inside receive/send controller , the two level interrupt receive device , which was compose of interrupt controller , was adopted to realize the home's digital signals' collection , the A/D converter was adopted to realize the home's digital signals' collection . The A/D converter was adopted to realize the home's analog signals' collection .

在家庭智能化内部收发控制器的设计中，采用中断控制器组成二级中断接收装置实现对家庭数字信号的采集，采用A/D转换器实现对家庭模拟信号的采集，采用译码器实现对数字信号的传出。

In order to confront with the increasingly complicated electromagnetic environments and adapt to the development necessary of the integrative electronic warfare,this paper studies the integrative reconnaissance technology for radar and communication signals from single-platform,analyzes the characteristics of radar and communication signals in detail from the different aspects of the electromagnetic frequency band,function,power,signal waveform and modulation mode,researches some key technologies to realize the integrative reconnaissance for radar and communication signals,such as integrative microwave front technology,digital receiver technology,digital signal processing and modularity technology,especially analyzes and researches the integrative signal sorting and identification technology deeply.

为对抗日益复杂的电磁环境，适应一体化综合电子战发展的需要，对单平台雷达/通信侦察一体化技术进行了研究。从电磁频段、功能、功率、信号波形及调制方式等不同角度，详细地分析了雷达与通信信号的特点；对实现雷达/通信侦察一体化的一体化微波前端技术、一体化数字接收机技术、一体化数字信号处理技术、模块化技术等关键技术进行了研究，尤其是对一体化信号分选、识别技术进行了深入的分析研究。

Analogtodigital converter is very important in digital signal process board,so calculation of the effective numbers of bits is of great importance for evaluation of system performance.

将模拟信号转换为数字信号后再进行处理，是当前信号处理普遍使用的方法，模数转换器就是将模拟信号转换为数字信号的器件，所以计算其有效转换位数对系统性能评估就显得尤为重要。

Digital signal processor DSP and realizes each kind of digital signal processing algorithm prominent merit fast by its unique structure, in the correspondence, the radar, the sound navigation and ranging, voice signal processing, the imagery processing, the high-speed control and the instrumentation equipment and so on numerous domains has obtained the widespread application.

数字信号处理器DSP以其独特的结构和快速实现各种数字信号处理算法的突出优点，在通信、雷达、声纳、语音信号处理、图象处理、高速控制和仪器设备等众多领域获得了广泛应用。

Digital signal processor DSP and realizes each kind of digitalsignal processing algorithm prominent merit fast by its uniquestructure, in the correspondence, the radar, the sound navigationand ranging, voice signal processing, the imagery processing, thehigh-speed control and the instrumentation equipment and so onnumerous domains has obtained the widespread application.

摘要数字信号处理器DSP以其独特的结构和快速实现各种数字信号处理算法的突出优点，在通信、雷达、声纳、语音信号处理、图象处理、高速控制和仪器设备等众多领域获得了广泛应用。

After doing that, the paper points out the universal architectures of the high-speed real-time signal processing system and describes how to implement them.. Since FFT plays an important role in digital signal processing, implementing FFT with FPGA is presented and the total realization graph is designed. For improving speed and decreasing computing complexity, high efficiency multiplier algorithm is used to realizing twiddle factor multiplier of butterfly processing unit.

最后本文描述了数字信号处理系统结构的实现方法，指出常见的高速、实时信号处理系统的四种结构；由于FFT算法在数字信号处理中占有重要的地位，所以本文提出了用FPGA实现FFT的一种设计思想，给出了总体实现框图：重点设计实现了FFT算法中的蝶形处理单元，采用了一种高效乘法器算法设计实现了蝶形处理单元中的旋转因子乘法器，从而提高了蝶形处理器的运算速度，降低了运算复杂度。

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。