排序方式: 共有104条查询结果,搜索用时 93 毫秒
61.
作为调试设备,数字信号发生器是数字信号处理中不可缺少的一部分,广泛的应用在生产生活当中。由于FPGA集密度高,功耗低,体积小以及可靠性高等优点于一身,所以采用Altera公司生产的FPGA实现数字信号发生器的设计,该数字信号发生器能够产生可调频率的正弦波、方波、三角波和锯齿波。通过硬件系统测试,结果表明:系统精度较高、带负载能力较强、运行稳定。 相似文献
62.
PENG Cheng lin CAI Chun ming HOU Wen sheng ZHEN Xiao lin YIN Zheng qin WU Xiao ying 《保鲜与加工》2010,(4):127-132
A FPGA based multi channel cortical stimulator system for cortical visual prosthesis was designed. devised for generating a sequence of electrical pulses for cortical stimulation. The simulator is composed of a FPGA and voltage/current converters. The FPGA comprises a spike generator to generate various electrical pulse sequences and some multiplexers to select signals. The prototype based on an Altera Cyclone EP1C6 FPGA with four channels is developed to perform the experimental evaluation. Two electrode chips ane put out of the left and right dura of cortex of a cat. The electrical stimulation is connected to the left one, while the visual electrically evoked potential (EEP) is recorded by the right one. The experimental results on cat's cortex show that the cortex can respond to the current stimulation. 相似文献
63.
64.
In order to meet the special application requirements of photovoltaic power system for contamination monitoring system in high voltage transmission line, this paper presents a charging system suitable for fast charging of supercapacitor with low-power solar cells. This design uses BUCK-BOOST circuit as the main charging circuit topology, uses a novel MPPT tracking method, Weighted Variable-Step Voltage-Hysteresis Perturbation & Observation MPPT(WVV P&O MPPT), and achieves control by FPGA. The system’s configuration and control strategy are theoretically verified by Matlab/Simulink, and the production and testing of the charging system are completed. Test results show that the charging system uses low-power solar cells and charges 2F and 5F super capacitors under normal weather conditions, and all of these charging works can be finished during a relatively short time. Compared with the previous research of our task force, this design effectively reduces the charging time and improves the utilization of solar energy. 相似文献
65.
NCO在数字下变频中的应用与实现 总被引:1,自引:0,他引:1
从介绍数字下变频人手,主要阐述数控振荡器在数字下变频中的重要地位,介绍多种实现数控振荡器方法的工作原理,并用FPGA进行实现,通过对几种实现方法的仿真结果进行比较,得出结论:NCO的性能与采用模拟技术的高频振荡器相比较,具有精度高、频率稳、噪声小等优点;采用CORDIC算法实现NCO,不需要存储器空间,资源利用率高. 相似文献
66.
以水稻直播技术为研究对象,依据水稻播种过程农艺要求,确定了水稻直播机的关键技术参数,并基于FPGA技术建立水稻直播机控制系统,对FPGA系统硬件及软件控制模块进行设计,以改善播种过程中的均匀性.试验结果表明:设计的水稻直播机控制系统在运行过程中,平均种距与系统设定种距相符,最大偏差满足系统设计需求;通过对播种均匀性进行... 相似文献
67.
飞机通信系统中重要数据对于保障飞行安全,提高飞行训练水平和机务维护质量都具有十分重要的作用。但是,由于以前电子设计技术的限制,记录仪记录的数据存在速度慢、没有实时性的特点。因此,十分有必要设计一款新的记录仪弥补这些缺点。本文介绍了基于USB接口的机载记录仪的总体设计和工作过程;分别详细描述了记录仪的硬件和软件程序设计和编程思想。 相似文献
68.
针对平菇栽培室内的环境温湿度控制问题,对温湿度控制系统的传感器、采集芯片及模块等硬件进行了选型设计;详细讨论了温湿度采集流程和转换方法,并给出FPGA温湿度预测算法。 相似文献
69.
在驻波测量土壤含水率分原理的基础上提出了一种以FPGA为核心的土壤含水量测量仪设计。测量仪的测量控制、AD控制、数据处理、显示控制与高频信号发生控制器等均集成在一片FPGA芯片上。该仪器具有成本低、结构紧凑、抗干扰能力强与测量迅速的特点。 相似文献