数字信号处理

After that, the issue, which should be solved in the picture additive process, is discussed in detail. On the base of analyzing digital television signal data construction, TBC processes is put forward to apply in each group signal. Effective data taken off from the key signal is also solved. And the choice and insertion is used to protect assistant data.

接着，详细讨论了在图像叠加过程中应解决的问题，在分析了数字电视信号数据结构的基础上，提出了对各路信号进行TBC处理的方法，同时解决了对键信号进行有效数据提取的问题，并通过选择插入的方式对辅助数据进行了保护。

In this paper, the FIR low-pass digital filtering method is first introduced for reducing the effects of noise signals in the experiment of velocity measurement of high-temperature flue gas flowing in pipe. The experimental results indicated that, only one peak presents in the cross-correlation graph, which is in good agreement with theoretical analysis result. Secondly, the temperature and pressure pulse signals of the high-temperature flue gas, obtained by thermocouple and pressure sensor, are introduced to explain the applicability of sensor characteristics.

本文介绍在测量管内流动的高温烟气流速的实验中采用FIR低通数字滤波器滤波方法可以排除干扰信号的影响的研究，实验结果证明，经过滤波处理后的信号互相关函数的图形不会出现大小相当的多个峰值，符合理论分析的结果；其次，本文还介绍了用热电偶和压力传感器采集的烟气温度和压力脉动信号，分析了传感器特性对相关测速的适应性。

At the same time, considering the jumpiness or incline caused inaccuracy and pretermission when the capsule moving ahead, two couples of infrared ray and electron transducer were designed to detect the light signal of the corresponding parts of the capsule. After the addition operation compensation and differential coefficient, turning the little different simulation signals of the body and cap of the capsule into digital signals for detection. It is more accurate for detection and stable to the disturbance. Step electromotor was used for the capsules direction turning which solved this problem efficiently. The capsules were ranged in order according to their colors with the cap at the same direction.

同时考虑到胶囊行进过程中跳动、倾斜及随机干扰造成的误判、漏判，设计了两对红外光电传感器用以同时检测胶囊上下两个边缘部位的光信号，两个检测信号经加法运算补偿、微分运算处理，将体现胶囊的帽、体微小几何尺寸差别特征的弱模拟信号直接转变成数字量检测，提高了检测的准确率及抗干扰能力，并由步进电机控制胶囊掉头，有效地解决了胶囊体、帽的位置调整，分色调头排列，达到帽、体一致。

The content mostly refers to signal pre-processing and post-processing, signal synchronization, digital multiplexer, and system integration.

主要包括的相关内容有：信号的预处理与后续处理，信号同步，数字复接，以及系统合成等内容。

Nowdays,the infrared camera in our country can export video signal and digital image signal. The video signal can display on the screen through the general grab card, but the digital one can not be inputted into computer without special image grab card. In this paper, an infrared image grab card and the correlative program driver are designed based on the analysis of the universe technology.

目前的国内的红外热像仪能够输出一组视频信号和数字图像信号，虽然视频信号能够通过普通采集卡在监视器显示，但是输出的数字图像信号不能直接输入到电脑上进行处理。

The invention provides a method of monitoring and controlling a mineral mixture flow in a froth flotation cell of a flotation plant which includes the steps of obtaining a series of digital images extracted of froth characteristics from a flotation cell.

本发明提供对在浮选工厂的泡沫浮选槽中矿石混合流进行监视和控制的方法，该方法包括得到从浮选槽提取的浮选特征的一系列数字图象的步骤；将数字图象传送给用于将它处理成数字参量泡沫特征的参量信号的计算机的步骤；响应接收的参量信号产生控制信号以便使浮选槽中的泡沫特征发生所需变化的步骤；和响应控制对浮选槽中的泡沫特征进行控制以便使浮选槽中的泡沫特征发生所需变化的步骤。

At first the Digital frequency shifting repeater transforms the original signal to the 70MHz IF signal in the donor, then the Frequency shift relay digital processing unit Digital Spread Spectrum the IF signal and through the 5.8GHZ signal to transmit to the remote end.

数字移频直放站首先在近端机内将将信源信号转换为数字70MHZ中频信号，通过&移频中继数字处理单元&将中频信号数字扩频后通过5.8GHZ的信号传送到远端。

Firstly it introduces relevant technical developments and trends, the task background and significance of the study, then analyzes hardware circuit of using image sensor as images collected, and utilizes the SAA7113 chip to deal with video image beforehand, SAA7113 lets the output of standard digital video signals to storage in FIFO memory, and decodes clock signals, Highlighted microprocessor control external circuit design of false coin and counting, and DSP control external circuit design, such as memory expand ect;Finally analyses CPLD as logic controller to control the logic and scheduling of some part ,and gives the undee emluator of some logic circuit.

文章首先阐述人民币智能分捡器相关技术的发展状况、发展趋势以及课题背景与研究意义；然后设计了利用图像传感器采集人民币图像输出模拟视频信号的硬件电路，以及利用视频解码芯片(SAA7113)对模拟视频图像进行预处理，SAA7113输出的标准数字视频信号存入FIFO存储器，同时还解码输出场、行同步信号、像素时钟信号送入CPLD等部分电路；重点设计了单片机控制验钞、点钞等外围电路，以及DSP控制的外围电路，如存储器的扩展等部分；最后完成CPLD对部分器件的逻辑和时序控制设计，并对逻辑电路的功能进行仿真，仿真结果令人满意。

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

Oversampled ADCs based on sigma-delta modulation are well-suited to the implementation of analog interfaces in digital communication and signal processing systems.

过采样∑△ADC采用∑△调制技术来实现模数转换，非常适合用来实现数字通信系统和信号处理系统中的模拟接口部件。

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。