查询词典 digital signal processing

A DPC ( 300 ) includes: a frequency source ( 310 ) for generating a clock signal; a delay line ( 320 ) for receiving the clock signal and generating phase-shifted clock signals at output taps; a digital control device ( 330 ) for generating a control signal; and a windowing and selection circuit for generating the output signal, that includes sequential logic devices ( 500, 510, 520 ) and a combining network.

DPC(300)包括：频率源(310)，用于产生时钟信号；延迟线(320)，用于接收时钟信号并在输出抽头产生相移时钟信号；数字控制器件(330)，用于产生控制信号；以及开窗口与选择电路，用于产生输出信号，包括：时序逻辑器件(500、510、520)和组合网络。

On this basis,a set of dynamic signal analysis system is designed by using high cost-effective digital signal processor TMS320F2812DSP.The system can acquisite dynamic signal and process data in the frequency domain,then directly display the value of the signal component of frequency and power,distortion on the LCD.

利用TI公司高性价比的数字信号处理TMS320F2812设计了一种便携式态信号分析仪，该系统信号分析仪可采集动态信号，并处理数据的频域，可直接在LCD上显示信号各分量频率值、功率值、失真度等。

The 5mV of the audio signal which comes from the microphone to linear amplificated by the audio signals amplifier,then mixes with music signals from other sound sources(eg:the tape 、CD) by the hybird amplifier . By the control of the digital volume controller the mixed signal ,then amplificated again by the preamplifier,when integrated power amplifier for idling time realizes the signal enlargement factor respectively is 10、100、1000 times;moreover is capable of delivering 3V of output to a 600%26Omega; load. the amplificate signal makes the loudhailer work at last.

该音频信号放大器能够将来自话筒5mV的音频信号进行线性放大，然后和来自其他音源的音乐信号通过混合放大器来混合，混合后的信号经数字音量控制器对高低频的增益进行提升与衰减，再通过前置放大器放大，当集成功率放大器为空载的时候实现信号的放大倍数分别为10、100、1000倍；另外再实现当负载为600%26Omega；的时候，输出幅度为3V，最后经扬声器发出悦耳的声音。

The introduction of some products are as follows: First, Taiwan's electronic devices Aosta Product:(self-produced self-marketing) program-controlled voltage insulation tester, grounding resistance, leakage current, micro-resistance tester, electrical parameters of the test Transformer parameters meter, insulation resistance tester, electronic load, on-machine, cable tester, variable frequency power supply, LCR Bridge, frequency meter, mV table, the standard signal generator, oscilloscope, signal generator, signal generator, digital multimeter, distortion device, before shaking device, spectrum analyzer, capacitance meter, inductance meter, modulation device, Sweep Signal Generator, Telephone Analyzer, Calibrator Table III, EMC Electric Tester, regulated power supply and so on.

现将部分产品介绍如下：程控耐压绝缘测试仪、接地电阻、泄漏电流、微电阻测试仪、电参数测试变压器参数测量仪、绝缘电阻测试仪、电子负载、导通机、排线测试仪、变频电源、LCR电桥、频率计、毫伏表、标准信号源、示波器、信号发生器、信号源、数字万用表、失真仪、抖摆仪、频谱分析仪、电容测量仪、电感测量仪、调制度仪、扫频信号发生器、电话分析仪、三用表校准仪、EMC电测仪、稳压电源等。

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。

Several high speed signal processing technologies of wideband digital receivers,including monbit IFM technology,polyphase channelized technology,channelized digital receiver based on FFT and RF bandpass sampling microwave digital receiver,are discussed in detail.

详细讨论了宽带数字接收机的几种高速信号处理技术，包括单比特瞬时测频技术、多相滤波信道化技术、基于FFT的信道化接收机和射频带通采样微波数字接收机，最后提出了在宽带中频数字接收机高速信号处理领域需要深入研究的有关技术。

Only oneA/D converter is needed to complete complex quadrature translation and digital downconversion, get in-phase component and quadrature component in digital field, and also,after intra-pulse compression is done, the signal-to-noise ratio is raised, and inter-pulsecompression is done in digital field, and finally, high range resolution profile is got.Two-step stretch processing method for MMW high-resolution RADAR is presented.

计算并优化了毫米波雷达中频信号带通采样的最佳采样频率，应用现有的集成电路技术实现对中频信号的直接采样、用一个A／D转换器在数字域完成复数正交变换，在数字域完成下变频、获得同相信号和正交相信号、完成对子脉冲的脉内压缩、完成对脉内压缩信号的第二次脉间压缩，从而获得高分辨一维距离像。

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

The use of mobile phone signal isolator, can be automatically designated to form the framework of an effective s你好eld to block mobile phone signals in the magnetic field, edsun-2010 mobile phone signal blocking s你好elding device is 10-40 meters in diameter in the range of effective to make GSM / DCS / CDMA / PHS mobile phone models, such as in你好bitory signals to the space to block the effects of mobile phone signals, so that can not be made and answered the phone, but do not affect the space outside the normal mobile phone signal transmission, leaving the MDPB set up mobile phone signal jammer-type space, the phone signal will not be interference, isolation, be able to resume normal use.

施用型手机信号断绝器，能在指定的规模内AUTO形成能够有用阻断手机信号的屏蔽磁力场，edsun-2010型手机信号阻断器的屏蔽直径是10-40米规模，在该规模内有用使GSM/DCS/CDMA/PHS等型号的手机信号被按捺，到达该空间内手机信号阻断的效验，使手机无法打出以及接听，但又不影响该空间之外的手机信号的正常传道输送，离开设置有MDPB型手机信号滋扰器的空间之外，手机信号将不会被滋扰、隔央视屏蔽外文减写离，便可恢复正常施用。

According to singular entropy and Percent of contribution to total energy, the de-noising rank is obtained and the signal is reconstructed. The thesis compares reconstruct wave form of different reconstruct rank and the error of original signal and reconstruct signal is contrasted.According to voltage flicker measurement, voltage flicker detection method based on Mathe Matical filtering and Teager Energy Operator is proposed. The multiple MM filter filters out pulse noise and white noise contained in fliker signal, then the filtered signal is tracked accurately and quikly via TEO.

提出了基于数学形态滤波和TEO能量算子的电压闪变快速测量方法，含噪电压闪变信号经过多结构元素复合数学形态滤波后，采用TEO能量算子计算跟踪电压闪变信号的包络，得到的包络信号用Pisarenco谱分析方法获得闪变调制信号的幅值频率等参数，对不同情况下的电压闪变信号进行了仿真验证。

Putt your way through 36 fun-filled holes of minigolf on 3D designed courses with elevated greens, bunkers, bridges and water hazards, among other crazy obstacles.

您的推杆方式，通过36个有趣的填孔迷你的三维设计的课程，以提升绿党，掩体，桥梁和水的危害，除其他疯狂的障碍。

Some participles can be used either as attributes or as predicatives.

有些分词既可当定语用，也可当表语用。