在要求高速数据生成和采集的市场中,性能的好坏是关键环节。目前业内在获取实时数据时,从高速的数模转换器(DAC)/模数转换器(ADC)、模拟前端(AFE)都需要用FPGA或ASIC芯片做个桥,LVDS串行高速转换信号总线连接到DSP处理器上。为了让模数...在要求高速数据生成和采集的市场中,性能的好坏是关键环节。目前业内在获取实时数据时,从高速的数模转换器(DAC)/模数转换器(ADC)、模拟前端(AFE)都需要用FPGA或ASIC芯片做个桥,LVDS串行高速转换信号总线连接到DSP处理器上。为了让模数转换器、数模转换器以及模拟前端实现更简易的直接连接,德州仪器(TI)日前宣布推出基于Key Stone TM的高集成度66AK2L06片上系统(So C)解决方案,把原来的FPGA芯片所做的桥整合到DSP里。展开更多
Based on the research of two geophone types （10 Hz moving-coil velocity and piezoelectric acceleration） and their velocity and acceleration parameters, frequency response functions have been determined, as well as t...Based on the research of two geophone types （10 Hz moving-coil velocity and piezoelectric acceleration） and their velocity and acceleration parameters, frequency response functions have been determined, as well as the differences between them. Also, shock- vibration tests have been accomplished, not only to explain the two shock response signal differences, but also to analyze the response signal characteristics and its ability to carry information. In addition, seismic data acquisition experiments have been carried out under comparable conditions in the field. A contrast analysis of shot gathers and stack profiles acquired with the two geophone types is given in this paper. The results show that the acceleration signal from the acceleration geophone has a better advantage in terms of high signal-to-noise ratio, high accuracy, high resolution, and quantity of information to better meet current and future requirements for seismic exploration.展开更多
TI高集成度片上系统（SoC）将数据采集速度提升3倍在要求高速数据生成和采集的市场中,性能是关键。为了让模数转换器（ADC）、数模转换器（DAC）以及模拟前端（AFE）实现更简易的直接连接,德州仪器（TI）日前宣布推出基于Key Stone TM...TI高集成度片上系统（SoC）将数据采集速度提升3倍在要求高速数据生成和采集的市场中,性能是关键。为了让模数转换器（ADC）、数模转换器（DAC）以及模拟前端（AFE）实现更简易的直接连接,德州仪器（TI）日前宣布推出基于Key Stone TM的高集成度66AK2L06片上系统（SoC）解决方案,为行业带来更多选择。66AK2L06 SoC集成了JESD204B接口标准,让总体电路板封装尺寸实现了高达66%的缩减。展开更多
This paper presents the result of an experimental study on the compression of mechanical vibration signals. The signals are collected from both rotating and reciprocating machineries by the accelerometers and a data a...This paper presents the result of an experimental study on the compression of mechanical vibration signals. The signals are collected from both rotating and reciprocating machineries by the accelerometers and a data acquisition （DAQ） system. Four optimal sparse representation methods for compression have been considered including the method of frames （ MOF）, best orthogonal basis （ BOB）, matching pursuit （MP） and basis pursuit （BP）. Furthermore, several indicators including compression ratio （CR）, mean square error （MSE）, energy retained （ER） and Kurtosis are taken to evaluate the performance of the above methods. Experimental results show that MP outperforms other three methods.展开更多
文摘在要求高速数据生成和采集的市场中,性能的好坏是关键环节。目前业内在获取实时数据时,从高速的数模转换器(DAC)/模数转换器(ADC)、模拟前端(AFE)都需要用FPGA或ASIC芯片做个桥,LVDS串行高速转换信号总线连接到DSP处理器上。为了让模数转换器、数模转换器以及模拟前端实现更简易的直接连接,德州仪器(TI)日前宣布推出基于Key Stone TM的高集成度66AK2L06片上系统(So C)解决方案,把原来的FPGA芯片所做的桥整合到DSP里。
基金supported jointly by the National Natural Science Foundation Fund of China (No.40930418)Chinese government-funded scientific program of the Sino Probe Deep Exploration in China (SinoProbe03)the National Science and Technology Support Program Project (No. 2011BAB04B01)
文摘Based on the research of two geophone types （10 Hz moving-coil velocity and piezoelectric acceleration） and their velocity and acceleration parameters, frequency response functions have been determined, as well as the differences between them. Also, shock- vibration tests have been accomplished, not only to explain the two shock response signal differences, but also to analyze the response signal characteristics and its ability to carry information. In addition, seismic data acquisition experiments have been carried out under comparable conditions in the field. A contrast analysis of shot gathers and stack profiles acquired with the two geophone types is given in this paper. The results show that the acceleration signal from the acceleration geophone has a better advantage in terms of high signal-to-noise ratio, high accuracy, high resolution, and quantity of information to better meet current and future requirements for seismic exploration.
文摘TI高集成度片上系统（SoC）将数据采集速度提升3倍在要求高速数据生成和采集的市场中,性能是关键。为了让模数转换器（ADC）、数模转换器（DAC）以及模拟前端（AFE）实现更简易的直接连接,德州仪器（TI）日前宣布推出基于Key Stone TM的高集成度66AK2L06片上系统（SoC）解决方案,为行业带来更多选择。66AK2L06 SoC集成了JESD204B接口标准,让总体电路板封装尺寸实现了高达66%的缩减。
基金Supported by the National Natural Science Foundation of China （No. 50635010）.
文摘This paper presents the result of an experimental study on the compression of mechanical vibration signals. The signals are collected from both rotating and reciprocating machineries by the accelerometers and a data acquisition （DAQ） system. Four optimal sparse representation methods for compression have been considered including the method of frames （ MOF）, best orthogonal basis （ BOB）, matching pursuit （MP） and basis pursuit （BP）. Furthermore, several indicators including compression ratio （CR）, mean square error （MSE）, energy retained （ER） and Kurtosis are taken to evaluate the performance of the above methods. Experimental results show that MP outperforms other three methods.
