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针对激光信号采集的要求,提供了一个典型的工作原理框图,并对其中数据采集和传输中关键模块的设计作了详细的描述,其中D/A转换模块负责在对激光信号探测前,完成对探测器前置放大器的调零,A/D采集模块负责对激光信号的数据采集和数据转换,并通过串口将打包后的数据上传到上位机,串口模块则负责接受来自上位机的指令和对采集信号数据的上传.实验结果表明:能够正确接受上位机指令,实现前置放大器的调零和对采集过程的控制,并将这些数据通过以速度为115200bit/s的串口形式上传给上位机,得到了200f/s的上传速度. 相似文献
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故障信号检测虚拟示波器数据采集系统设计 总被引:1,自引:0,他引:1
《现代电子技术》2016,(20):97-100
为了获取虚拟示波器故障信号数据,设计一种故障信号检测虚拟示波器的数据采集系统,该系统主要由衰减保护控制电路、信号调理电路、A/D转换、数据缓存和单片机5部分组成。通过减少信号调理电路使输入信号和A/D模块满量程值之间的差异达到理想的精确度。利用单片机ATmega32和AD574组成的A/D转换电路对数据进行转换和采集。在系统的输入端设计比例衰减与过压保护电路,避免因电压幅值过大造成芯片损坏。软件设计中,详细分析A/D采集的主程序及相关实现代码。实验结果表明,所提系统采集精度高,所需时间短,具有很高的采集性能。 相似文献
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随着无刷直流电机在运动控制领域应用越来越广泛,结合单片机的控制技术产生了新一代无刷直流电机控制技术。文中介绍了一种基于PIC系列单片机的高性能、低成本直流无刷电机控制系统,该系统利用PIC18F4431单片机的高速A/D采集模块、PWM模块和硬件乘法器实现了对PWM信号的产生、转子位置和速度的检测以及电流双闭环增量式PI控制,并对该控制系统的硬软件环节实现进行了阐述。模拟实验证明,该系统具有良好的动态性能与控制精度。 相似文献
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基于单片机技术的数据采集系统的设计 总被引:3,自引:0,他引:3
介绍了基于单片机技术的数据采集系统的硬件设计和软件设计.该系统以AT89C51单片机为核心,TLC2543作为A/D转换器, 通过RS232通信接口,实现单片机与PC机间的采集数据的传输.该系统分为数据采集传输和数据显示两大模块,数据采集通过单片机控制TLC2543芯片实现A/D转换,并通过RS232实现单片机和PC机间采集数据的传输.数据显示模块,通过在Visual Basic开发环境下,运用VB提供的通信控件MSCOMM来实现上位机对采集数据的收集和显示. 相似文献
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24通道高精度A/D数据采集模块的研制 总被引:2,自引:1,他引:1
为了满足声纳系统对数据采集模块的精度要求,研制了一种基于高精度Σ-ΔA/D数据转换器及FPGA的A/D数据采集模块。采用FPGA实现数据采集控制、数据缓冲及PCI总线控制器等功能,同时利用高精度Σ-ΔA/D数据转换器的超采样率保证了数据采集精度方面的要求。该A/D数据采集模块满足声纳系统对数据采集模块的精度要求,简化硬件电路结构,提高了数据采集的可靠性和稳定性,同时有利于系统的功能升级,为声纳系统应用提供一种经济实用的数据采集模块。 相似文献
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121.5MHz是国际电联规定的飞机遇险呼救专用频率,其他任何部门和个人不得占用。一旦出现呼救信号,必须立即找到信号源.否则后果不堪设想。 相似文献
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The speech processing studies have advanced rapidly in recent years spurred on by great progresses in thevlsi technologies and in the digitalization of the networks. This paper offers an overview of the most attractive techniques which have focused the recent researchs and developments in speech coding, recognition and synthesis areas. For speech compression, the emphasis is put on a family of techniques named code-excited linear prediction (celp) which dominates current studies for rates in the range of 4 to 16 kbit/s. In terms of speech recognition, particular emphasis is placed on the following three elements which are essential in order to increase the robustness of the systems : telephone line adaptation, rejection of parasite noise and out-of-vocabulary words, and keyword spotting. In terms of text-to-speech synthesis, thepsola (pitch synchronous overlap and add) technique is outlined herein. This technique gives rise to a new generation of synthesis systems which produce speech with very natural timbre. The analysis of current tendencies for each area allows to suggest attractive directions for future research. 相似文献
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使用双通道分析仪表测试两路相位相参的调制信号间的时间关系.一方面验证使用互相关技术方法测试信号间时间关系的可行性.另一方面通过对被测电路器件的输出和输入信号的相关测试.得到电路在复杂激励状态下的延迟特性。[编者按] 相似文献
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为了提高情感识别的正确率,针对单一语音信号特征和表面肌电信号特征存在的局限性,提出了一种集成语音信号特征和表面肌电信号特征的情感自动识别模型.首先对语音信号和表面肌电信号进行预处理,并分别提取相关的语音信号和表面肌电信号特征,然后采用支持向量机对语音信号和表面肌电信号特征进行学习,分别建立相应的情感分类器,得到相应的识别结果,最后将识别结果分别输入到支持向量机确定两种特征的权重系数,从而得到最终的情感识别结果.两个标准语情感数据库的仿真结果表明,相对于其它情感识别模型,本文模型大幅提高了情感识别的正确率,人机交互情感识别系统提供了一种新的研究工具. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1987,75(9):1246-1259
We describe a novel, expandable, multiple digital signal processor (DSP) architecture with a symbolic processing host. A multiprocessor board, called Odyssey, based on this architecture has been developed to combine symbolic and real-time digital signal processing in a single computing environment. Some of the key features of the board are: 20 million multiply/accumulates per second, 512K bytes of data space, and expandability to 16 boards on a NuBus host. The DSPs used are the TMS32020 signal processing chips developed by Texas Instruments, and the host is Texas Instruments' Explorer, a LISP machine workstation. This provides environment to perform many intelligent signal processing tasks by associating meaningful relationships between quantitative (signal processing) and qualitative (symbolic processing) entities to develop inferences using expert system technology. Applications such as grammar-driven connected speech recognition, neural network simulation, EEG analysis, and generation of speech from general English text with natural language processing are some of the tasks that can utilize the computational power of the multiple DSP and/or the associated symbolic processing capabilities. Software development tools to implement applications include the device driver to facilitate communication between the host processor and the Odyssey board, a unique window-based debugger resident on the Explorer that allows for simultaneous state display of all the processors on the board, a FORTH interpreter for high-level language programming, and a cross-assembler/linker for assembly level programming. 相似文献
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Jeyaraj Pandia Rajan Nadar Edward Rajan Samuel 《Multidimensional Systems and Signal Processing》2020,31(4):1299-1316
Multidimensional Systems and Signal Processing - In this research paper we present designing and evaluating the electrocardiography (ECG) and Myoelectric signal (EMG) pattern recognition methods... 相似文献
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Ivan W. Selesnick 《Signal processing》2011,91(12):2793-2809
Numerous signals arising from physiological and physical processes, in addition to being non-stationary, are moreover a mixture of sustained oscillations and non-oscillatory transients that are difficult to disentangle by linear methods. Examples of such signals include speech, biomedical, and geophysical signals. Therefore, this paper describes a new nonlinear signal analysis method based on signal resonance, rather than on frequency or scale, as provided by the Fourier and wavelet transforms. This method expresses a signal as the sum of a ‘high-resonance’ and a ‘low-resonance’ component—a high-resonance component being a signal consisting of multiple simultaneous sustained oscillations; a low-resonance component being a signal consisting of non-oscillatory transients of unspecified shape and duration. The resonance-based signal decomposition algorithm presented in this paper utilizes sparse signal representations, morphological component analysis, and constant-Q (wavelet) transforms with adjustable Q-factor. 相似文献