面向车载监控视频的快速检索设计

在车载监控过程中,为提高视频检索的效率,提出了一种快速检索方法.首先,采用一种改进的基于块匹配的方法快速消除视频抖动,完成图像序列预处理;然后根据不同用户需求,通过自动和主动两种方式检索视频.实验结果表明,该方法在不遗漏重要画面的同时,能够快速检索到用户感兴趣的视频片段,为用户减少了大量的视频浏览时间.     

激光打靶装置中的集散式数字同步系统的研究

介绍了一种集散式数字同步系统,它能够实现对数字同步机的本地控制、远地控制和集中控制.它由多个本地控制单元和一个远地控制单元组成,通过RS-422总线实现相互之间的通信.其中数字同步机是将模拟延时电路和数字延时电路有机的结合在一起用于输出时间基准信号和触发同步信号的实验装置.     

A fully integrated CMOS voltage regulator for supply-noise-insensitive charge pump PLL design

In this paper, a new design of on-chip CMOS voltage regulator, which provides two stable power supplies to charge pump and voltage controlled oscillator (VCO) in charge pump phase-locked loop (PLL), is presented. A power supply noise rejection (PSNR) whose peaking is less than −40 dB is achieved over the entire frequency spectrum for VCO supply. The voltage regulator provides maximum 14 mA current, and static current is about 780 μA at 3.3 V. Based on the proposed voltage regulator, a PLL clock generator has been developed and measured in the AMS 0.35 μm CMOS process. Operating at 160 MHz, a period jitter of 13.64 ps was measured under a clean power supply, while period jitter became 16.24 ps under a power supply modulated with a 400 mV, 10 kHz square wave.     

Noise-Insensitive Digital BIST for any PLL or DLL

PLLs are the heart of most SoCs, so their performance affects many tests. Practical, published PLL BIST approaches cannot measure <10 ps RMS jitter or >1 GHz. This paper describes how a SerDes undersampling DFT technique was adapted to test multiple PLLs and DLLs for jitter, phase error, output frequency, duty cycle, lock time, and lock range. Two techniques for cancelling random and systematic noise are also described. The multi-GHz range, sub-picosecond jitter noise floor, and minimal silicon area are better than for any previous silicon-proven DFT or BIST that needs no calibration or analog circuitry. FPGA implementation results are provided.

多级多通道气体开关的实验研究

 介绍了多级多通道气体开关的实验研究工作。开关在电脉冲触发（触发脉冲幅值85 kV）条件下,工作电压在1.0～2.0 MV范围内能够正常工作。自击穿实验验证了Bradley经验公式对于这种开关的适用性,外触发实验研究得到了开关的触发特性。结果表明：开关击穿延时小于100 ns,抖动小于8 ns;3个开关击穿时刻之间的极差小于10 ns。     

自耦式紫外预电离开关特性

 研究了300 kV脉冲电压作用下自耦式紫外预电离开关的工作原理。为了在脉冲电压下实现开关的自耦合预电离,设计了适当的分压电路及预电离结构。模拟计算表明,分压电路参数合适时,可以实现预电离间隙与开关主间隙的击穿配合。实验结果表明：在脉冲电压作用下,调节电路参数可以有效调节紫外预电离产生时刻;在适当的时刻产生紫外预电离可以有效减小开关击穿抖动;该开关在240 ns上升时间脉冲电压作用下击穿抖动可小于3 ns,在36 ns上升时间脉冲电压作用下击穿抖动可小于2 ns。     

保障流媒体时间结构的网络时延分析

流媒体同步对端到端时延和时延抖动提出了确定的要求,而终端抖动缓存一方面能消除时延抖动的影响,一方面却增加了端到端时延,流媒体同步保障对网络时延的要求不明确。论文从概率保障流媒体同步的角度,确定了保障流媒体同步的抖动缓存容量范围,提出了流媒体同步网络保障的充分条件,针对基于Internet VoIP(Voice over IP)业务的实际网络测试结果,给出了应用流媒体同步网络保障充分条件进行同步保障评价的应用实例并验证了其正确性。     

抑制SDH网中指针调整抖动的平滑相位泄漏技术

指针调整会在同步数字系列（ＳＤＨ）网中引入非常大的抖动,本文在分析了比较了常见的两类指针泄漏方法的基础上,提出了一种新的抑制指针调整抖动的方法－平滑相位泄漏法,此方法有效地解决了泄漏的量化抖动问题以及复杂的泄漏控制问题,本文通过理论分析和计比较了平滑相位泄漏方法与理想滤波的性能,并给出了此方法对不同指针测试序列的抖动抑制性能。     

Effects of practice with and without knowledge of results on jitter and shimmer levels in normally speaking women

The effects of practice on jitter and shimmer were assessed in two groups of normally speaking women. Subjects in both groups sustained trials of /a/ as steadily as possible during a baseline session, two practice sessions, and a transfer session. Subjects in one group received visual and verbal feedback during the practice sessions. Subjects in the other group received no feedback. Shimmer means remained essentially stable over the four sessions for both groups, and no differences were apparent between the groups. Jitter values were significantly different between sessions for both groups, and between the two groups for the practice sessions. These results are consistent with findings from manual performance and retention tasks. The present findings also support a recently developed neurologic model of jitter.     

The effects of vowels on voice perturbation measures

This study examines voice perturbation parameters of the sustained [a] in English and of the eight vowels in Turkish to discover whether any difference exists between these languages, and whether a correlation exists between voice perturbation parameters and articulatory and acoustic properties of the Turkish vowels. Eight Turkish vowels uttered by 26 healthy nonsmoker volunteer males who are native Turkish speakers were compared with a voice database that includes samples of normal and disordered voices belonging to American English speakers. Fundamental frequencies, the first and second formants, and perturbation parameters, such as jitter percent, pitch perturbation quotient, shimmer percent, and amplitude perturbation quotient of the sustained vowels, were measured. Also, the first and second formants of the sustained [a] in English were measured, and other parameters have been obtained from the database. When the voice perturbation parameters in Turkish and English were compared, statistically significant differences were not found. However, when Turkish vowels compared with each other, statistically significant differences were found among perturbation values. Categorical comparisons of the Turkish vowels like high-low, rounded-unrounded, and front-back revealed significant differences in perturbation values. In correlation analysis, a weak linear inverse relation between jitter percent and the first formant (r=-0.260, p<0.05) was found.