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准周期信号基2同步数据采集系统的设计 总被引:1,自引:0,他引:1
介绍了一款基于单片机的倍频电路。该电路能够实现对准周期信号的整周期同步采样,具有倍频精度高、跟踪速度快、能对准周期信号进行预测和补偿等特点;同时介绍了一种周期预测的方法和原理以及基于PC总线实现准周期信号的同步数据采集系统。 相似文献
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The toll registration system installed on the Humber Bridge uses a microprocessor in each of the 16 traffic lane booths, for the control of traffic, communication with the central processor and the computation of toll fees.
This article describes the system and operational procedures employed, with particular emphasis on the requirements and software development of the lane microprocessors. 相似文献
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VV Athani 《Microprocessors and Microsystems》1979,3(8):359-364
The paper reports the development of a 16-channel data acquisition system based on the Fairchild F8 microprocessor. The system developed consists of an analogue input unit containing a 16-channel analogue multiplexer, instrumentation amplifier and A/D converter, and an F8 microprocessor which stores and processes data. Software for data logging at regular intervals, data logging on demand by the operator, limit checking, trend checking and self checking has already been developed. Software to compensate for input offset as well as for nonlinearity of transducer characteristics is under development. 相似文献
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线阵CCD数据的高速采集系统 总被引:14,自引:0,他引:14
介绍了一种基于单片机的CCD数据采集系统,采用了DMA块传输方式,利用MAX153高速A/D实现了数据的高速采集,结合在光谱测量系统中的应用,给出了测试结果,该系统具有一定的实价值及应用前景。 相似文献
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针对数据采集系统设计要求具有精度高、速度快、路数多的特点,根据成本要求,采用DAQ-2010数据采集卡和CPLD等硬件完成了测试系统的搭建工作,介绍了系统的工作原理和开发思路,描述了系统软件的开发和功能。在实际应用中整个系统稳定可靠,取得了良好效果。 相似文献
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Early diagnosis of heart disease is typically based on a cassette recording of the electrocardiogram (ECG) signal which is then studied and analysed using a microcomputer. The system is bulky, unreliable and prone to mechanical failure. This paper presents the design and implementation of a compact microprocessor-based portable system used for heart condition diagnosis over a long period. The system reads, stores and analyses the ECG signals repetitively in real time for a specified period. The diagnostic data and samples of ECG signals are stored throughout the test period. The system hardware and software design are oriented towards a single-chip microcomputer-based system, hence minimizing size. The operating algorithm is based on a logical approach to ECG signal diagnosis and hence requires little memory. 相似文献
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An application that involves high speed signal changes at input side makes it very important to have a high speed Data Acquisition without loss of any data. This paper discusses FPGA design architecture programed by VHDL firmware which involves high speed Analog to digital converter (ADC) with sampling rate of 80 mega samples per second, Direct Memory Access (DMA) programed in such a way which transfers data without loss of single data sample and high speed Dual Data Rate 3 (DDR3) SDRAM to store digitized data for further manipulations. It also describes data-rate, and speed achieved to transfer data and plot a graph of digital value which shows there is no loss of data. 相似文献
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从影响典型模数混合采集系统噪声的各种因素入手,详细分析了引起模数混合采集系统噪声干扰的主要因素,针对每个环节提出了切实可行的抑制噪声的具体方法和措施,很大程度上提升了系统的性能,并给出了实例设计. 相似文献
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基于ECT的高速数据采集系统设计 总被引:1,自引:0,他引:1
数据采集系统的速度制约了电容层析成像技术在航空发动机气路监测系统等高速设备中的应用。为此,设计了一种基于FPGA的新型电容数据采集系统,采用DDR2存储技术和PCI总线技术实现了数据的高速传输。同时应用卡尔曼滤波器代替传统的FIR滤波器,有效提高了滤波效率。测试结果表明,该系统具有抗干扰能力强、采样精度高、处理速度快等优点。 相似文献