为了适应工程中多通道振动数据的快速存储和准确查询。基于LabVIEW的TDMS(technical data management streaming)数据逻辑方式,设计实现了一套完整的某试车台振动数据存储查询虚拟仪器系统。该系统可以通过手动存储和报警自动触发存储...为了适应工程中多通道振动数据的快速存储和准确查询。基于LabVIEW的TDMS(technical data management streaming)数据逻辑方式,设计实现了一套完整的某试车台振动数据存储查询虚拟仪器系统。该系统可以通过手动存储和报警自动触发存储两种方式对多通道、多类型海量数据进行快速存储。同时,还具有对指定通道指定类型数据的准确查询、导出以及打印功能等。在某型号试车台背景下开发出来的这套性能和操控界面兼备的监测系统,对于类似工程实践具有一定的借鉴意义。展开更多
在LabVIEW中分别使用TDMS(Technical Data Management Streaming)文件和SQL Server数据库分析处理实验数据,比较两者的运行速度。对速度较慢的方法再进行算法改进,相对提高运算效率,最终分析速度差异的根本原因,这将有助于在LabVIEW的...在LabVIEW中分别使用TDMS(Technical Data Management Streaming)文件和SQL Server数据库分析处理实验数据,比较两者的运行速度。对速度较慢的方法再进行算法改进,相对提高运算效率,最终分析速度差异的根本原因,这将有助于在LabVIEW的各种应用中合理使用数据处理方式。展开更多
This paper presents the design of a low-power multi-channel analog front-end(AFE) for bio-potential recording. By using time division multiplexing(TDM), a successive approximation register analog-to-digital converter(...This paper presents the design of a low-power multi-channel analog front-end(AFE) for bio-potential recording. By using time division multiplexing(TDM), a successive approximation register analog-to-digital converter(SAR ADC) is shared among all 20 channels. A charge-sharing multiplexer(MUX) is proposed to transmit the output signals from the respective channels to the ADC. By separately pre sampling the output of each channel, the sampling time of each channel is greatly extended and additional active buffers are avoided. The AFE is fabricated in a 65-nm CMOS process, and the whole system consumes 28.2 μW under 1 V supply. Each analog acquisition channel consumes 1.25 μW and occupies a chip area of 0.14 mm2. Measurement results show that the AFE achieves an input referred noise of 1.8 μV·rms in a 350 Hz bandwidth and a noise efficiency factor(NEF) of 4.1. The 12-bit SAR ADC achieves an ENOB of 9.8 bit operating at 25 k S/s. The AFE is experimented on real-world applications by measuring human ECG and a clear ECG waveform is captured.展开更多
伴随双摄及多摄技术在消费电子、安防监控等领域的普遍应用,如何在保证图像处理性能的同时,降低硬件成本与功耗成为行业焦点。传统方案中,双核图像信号处理器(image signal processor,ISP)分别处理双路信号,或者依靠外部存储缓冲的帧交...伴随双摄及多摄技术在消费电子、安防监控等领域的普遍应用,如何在保证图像处理性能的同时,降低硬件成本与功耗成为行业焦点。传统方案中,双核图像信号处理器(image signal processor,ISP)分别处理双路信号,或者依靠外部存储缓冲的帧交织时分复用技术,这类技术存在芯片面积大、带宽占用多、功耗过高的情形。提出了一种基于行交织时分复用(time division multiplexing,TDM)的单核ISP架构,依靠数据整流器、TDM处理单元及数据分流器协同设计,无须外部帧缓冲,降低了系统带宽需求与功耗,并且支持任意帧率双路信号耦合处理。阐述了设计原理、关键技术及实现路径,并经过对比验证其优势。展开更多
文摘为了适应工程中多通道振动数据的快速存储和准确查询。基于LabVIEW的TDMS(technical data management streaming)数据逻辑方式,设计实现了一套完整的某试车台振动数据存储查询虚拟仪器系统。该系统可以通过手动存储和报警自动触发存储两种方式对多通道、多类型海量数据进行快速存储。同时,还具有对指定通道指定类型数据的准确查询、导出以及打印功能等。在某型号试车台背景下开发出来的这套性能和操控界面兼备的监测系统,对于类似工程实践具有一定的借鉴意义。
文摘在LabVIEW中分别使用TDMS(Technical Data Management Streaming)文件和SQL Server数据库分析处理实验数据,比较两者的运行速度。对速度较慢的方法再进行算法改进,相对提高运算效率,最终分析速度差异的根本原因,这将有助于在LabVIEW的各种应用中合理使用数据处理方式。
基金supported by the National Key R&D Program of China under Grant 2018YFA0701400 and 2018YFA0701401.
文摘This paper presents the design of a low-power multi-channel analog front-end(AFE) for bio-potential recording. By using time division multiplexing(TDM), a successive approximation register analog-to-digital converter(SAR ADC) is shared among all 20 channels. A charge-sharing multiplexer(MUX) is proposed to transmit the output signals from the respective channels to the ADC. By separately pre sampling the output of each channel, the sampling time of each channel is greatly extended and additional active buffers are avoided. The AFE is fabricated in a 65-nm CMOS process, and the whole system consumes 28.2 μW under 1 V supply. Each analog acquisition channel consumes 1.25 μW and occupies a chip area of 0.14 mm2. Measurement results show that the AFE achieves an input referred noise of 1.8 μV·rms in a 350 Hz bandwidth and a noise efficiency factor(NEF) of 4.1. The 12-bit SAR ADC achieves an ENOB of 9.8 bit operating at 25 k S/s. The AFE is experimented on real-world applications by measuring human ECG and a clear ECG waveform is captured.
文摘伴随双摄及多摄技术在消费电子、安防监控等领域的普遍应用,如何在保证图像处理性能的同时,降低硬件成本与功耗成为行业焦点。传统方案中,双核图像信号处理器(image signal processor,ISP)分别处理双路信号,或者依靠外部存储缓冲的帧交织时分复用技术,这类技术存在芯片面积大、带宽占用多、功耗过高的情形。提出了一种基于行交织时分复用(time division multiplexing,TDM)的单核ISP架构,依靠数据整流器、TDM处理单元及数据分流器协同设计,无须外部帧缓冲,降低了系统带宽需求与功耗,并且支持任意帧率双路信号耦合处理。阐述了设计原理、关键技术及实现路径,并经过对比验证其优势。
