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一种高速A/D转换器时域重构技术研究
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作者 崔庆林 杨松 《微电子学》 CAS 北大核心 2024年第2期317-322,共6页
A/D转换器在航空航天系统中的重要元器件,随着器件转换时钟频率不断提高而其工作环境不断恶化,如何准确测试其时间参数对于全面评价A/D转换器性能特别重要。目前对于高速A/D转换器时间参数测试,主流方法是通过示波器直接测试其输出,该... A/D转换器在航空航天系统中的重要元器件,随着器件转换时钟频率不断提高而其工作环境不断恶化,如何准确测试其时间参数对于全面评价A/D转换器性能特别重要。目前对于高速A/D转换器时间参数测试,主流方法是通过示波器直接测试其输出,该方法对于示波器采样速度要求比较高。文章提出一种高速A/D转换器时域重构技术,可以通过计算机数字信号处理方法来实现高速A/D转换器时间参数测试,同时避免对示波器采样速度的依赖。同时,在研究高速A/D转换器时域重构技术方法及其应用的基础上,通过了相关试验验证。 展开更多
关键词 高速a/d转换器 时域重构 瞬态响应 过压恢复 缺陷分析 单粒子闭锁和翻转
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血清GSDMD、ACE2在小儿川崎病中的表达水平及临床意义研究
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作者 范泽卫 李荟 李竹青 《国际检验医学杂志》 CAS 2024年第4期447-451,456,共6页
目的 探索血清焦孔素蛋白D(GSDMD)、血管紧张素转化酶2(ACE2)在小儿川崎病(KD)患儿中的表达水平及临床意义。方法 收集2020年1月至2022年1月该院诊治的90例KD患儿为KD组,根据KD患儿是否发生冠状动脉损伤(CAL),将KD组分为CAL组(32例)和非... 目的 探索血清焦孔素蛋白D(GSDMD)、血管紧张素转化酶2(ACE2)在小儿川崎病(KD)患儿中的表达水平及临床意义。方法 收集2020年1月至2022年1月该院诊治的90例KD患儿为KD组,根据KD患儿是否发生冠状动脉损伤(CAL),将KD组分为CAL组(32例)和非CAL组(58例),选取同期因急性呼吸道感染发热住该院的患儿50例为发热对照组,另选取同期该院儿外科行择期手术的腹股沟斜疝患儿50例为对照组。采用酶联免疫吸附试验检测血清GSDMD、ACE2水平。Pearson相关分析血清GSDMD、ACE2与临床指标的相关性。多因素Logisitic回归分析KD患者发生CAL的影响因素。受试者工作特征(ROC)曲线分析血清GSDMD、ACE2对KD患儿发生CAL的诊断价值。结果 KD组血清GSDMD、ACE2水平高于发热对照组和对照组,差异有统计学意义(均P<0.05)。相比于非CAL组,CAL组KD患儿发热持续时间、丙种球蛋白治疗时间、红细胞沉降率、血小板计数、C反应蛋白、GSDMD、ACE2水平均明显较高,而血钠、白蛋白明显较低,差异有统计学意义(均P<0.05)。Pearson相关分析结果,KD组患儿血清GSDMD、ACE2水平与发热持续时间、丙种球蛋白治疗时间、红细胞沉降率、血小板计数、C反应蛋白呈正相关(均P<0.05),与血钠、白蛋白呈负相关(均P<0.05)。多因素Logistic回归分析结果显示,血清GSDMD、ACE2升高是影响KD患儿发生CAL的独立危险因素。ROC曲线分析结果显示,血清GSDMD、ACE2两项联合检测KD患儿发生CAL的曲线下面积(AUC)及其95%CI为0.918(0.868~0.949),明显大于血清GSDMD、ACE2单项检测的AUC及其95%CI[依次为0.838(0.789~0.887)、0.865(0.811~0.912)],差异有统计学意义(Z=5.116、4.217,均P<0.05)。结论 血清GSDMD、ACE2两项联合检测对于KD患儿发生CAL具有较高的诊断价值。 展开更多
关键词 川崎病 焦孔素蛋白d 血管紧张素转化酶2 冠状动脉损伤
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A 128×128 SPAD LiDAR sensor with column-parallel 25 ps resolution TA-ADCs
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作者 Na Tian Zhe Wang +6 位作者 Kai Ma Xu Yang Nan Qi Jian Liu Nanjian Wu Runjiang Dou Liyuan Liu 《Journal of Semiconductors》 EI CAS CSCD 2024年第8期34-40,共7页
This paper presents a design of single photon avalanche diode(SPAD)light detection and ranging(LiDAR)sensor with 128×128 pixels and 128 column-parallel time-to-analog-merged-analog-to-digital converts(TA-ADCs).Un... This paper presents a design of single photon avalanche diode(SPAD)light detection and ranging(LiDAR)sensor with 128×128 pixels and 128 column-parallel time-to-analog-merged-analog-to-digital converts(TA-ADCs).Unlike the conventional TAC-based SPAD LiDAR sensor,in which the TAC and ADC are separately implemented,we propose to merge the TAC and ADC by sharing their capacitors,thus avoiding the analog readout noise of TAC’s output buffer,improving the conversion rate,and reducing chip area.The reverse start-stop logic is employed to reduce the power of the TA-ADC.Fabricated in a 180 nm CMOS process,our prototype sensor exhibits a timing resolution of 25 ps,a DNL of+0.30/−0.77 LSB,an INL of+1.41/−2.20 LSB,and a total power consumption of 190 mW.A flash LiDAR system based on this sensor demonstrates the function of 2D/3D imaging with 128×128 resolution,25 kHz inter-frame rate,and sub-centimeter ranging precision. 展开更多
关键词 3d imaging CMOS imagers direct time-of-flight(dTOF) time-to-analog converter(TAC)
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基于层次分析法与改进D-S理论的阀水冷系统状态评估
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作者 杨群 齐鹏洋 +1 位作者 李昊 刘钊 《宁夏电力》 2024年第1期55-61,共7页
为了及时评估保障换流阀可靠运行的阀水冷系统运行状态,首先,分析了换流站阀水冷系统整体构成,选取主要历史数据和实时数据构建了评估指标体系,通过三角形函数和半梯形函数以及专家调查法确定各个指标的隶属度;其次,基于层次分析法确定... 为了及时评估保障换流阀可靠运行的阀水冷系统运行状态,首先,分析了换流站阀水冷系统整体构成,选取主要历史数据和实时数据构建了评估指标体系,通过三角形函数和半梯形函数以及专家调查法确定各个指标的隶属度;其次,基于层次分析法确定各个评估指标权重,改进D-S理论建立阀水冷系统运行状态评估模型;最后,通过采集实际工程阀水冷系统主要指标数据对模型进行了验证,并以阀水冷系统滤芯清洗前后数据为例对评估结果进行了对比。结果表明,所建模型能够对阀水冷系统运行状态做出准确识别和评估,有利于运维人员及时掌控阀水冷系统运行状态,保障其可靠运行。 展开更多
关键词 换流阀 状态评估 阀水冷系统 层次分析法 改进d-S证据理论
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A 12bit 300MHz Current-Steering CMOS D/A Converter 被引量:1
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作者 倪卫宁 耿学阳 石寅 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2005年第6期1129-1134,共6页
The proposed DAC consists of a unit current-cell matrix for 8MSBs and a binary-weighted array for 4LSBs,trading-off between the precision,speed,and size of the chip.In order to ensure the linearity of the DAC,a double... The proposed DAC consists of a unit current-cell matrix for 8MSBs and a binary-weighted array for 4LSBs,trading-off between the precision,speed,and size of the chip.In order to ensure the linearity of the DAC,a double Centro symmetric current matrix is designed by the Q2 random walk strategy.To achieve better dynamic performance,a latch is added in front of the current switch to change the input signal,such as its optimal cross-point and voltage level.For a 12bit resolution,the converter reaches an update rate of 300MHz. 展开更多
关键词 d/a converter current-steering CMOS mixed integrated circuit cross-point Q2 random walk
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A 16 bit Stereo Audio ΣΔ A/D Converter
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作者 陈雷 赵元富 +3 位作者 高德远 文武 王宗民 朱小飞 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第7期1183-1188,共6页
A 16 bit stereo audio novel stability fifth-order ∑△ A/D converter that consists of switched capacitor ∑△ modulators, a decimation filter, and a bandgap circuit is proposed. A method for the stabilization of a hig... A 16 bit stereo audio novel stability fifth-order ∑△ A/D converter that consists of switched capacitor ∑△ modulators, a decimation filter, and a bandgap circuit is proposed. A method for the stabilization of a high order single stage ∑△ modulator is also proposed. A new multistage comb filter is used for the front end decimation filter. The ∑△ A/D converter achieves a peak SNR of 96dB and a dynamic range of 96dB. The ADC was implemented in 0. 5μm 5V CMOS technology. The chip die area occupies only 4. 1mm × 2.4mm and dissipates 90mW. 展开更多
关键词 ∑△ a/d converter switched capacitor STABILITY decimation filter bandgap circuits
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高精度高摆幅多工位ADC测试系统设计 被引量:2
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作者 王于波 胡毅 +3 位作者 关媛 王琨 李大猛 肖鹏程 《电子技术应用》 2023年第4期44-51,共8页
基于V93000 ATE设计了一种采用外加电源升压变换模块及可变增益仪器仪表运算放大器,以解决大输入摆幅高精度多工位ADC的量产测试需求的测试方案。理论分析和测试验证结果表明,该ADC测试系统可分别产生峰峰值超过29 V的Ramp波和正弦波测... 基于V93000 ATE设计了一种采用外加电源升压变换模块及可变增益仪器仪表运算放大器,以解决大输入摆幅高精度多工位ADC的量产测试需求的测试方案。理论分析和测试验证结果表明,该ADC测试系统可分别产生峰峰值超过29 V的Ramp波和正弦波测试信号,测试信号SNR优于105 dB、THD优于-103 dB,可以满足16 bit、±10 V甚至以上高输入摆幅多工位ADC的大批量量产测试需求。 展开更多
关键词 自动测试设备 a/d转换器 动态参数测试 AdC终测
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CLEC4D、CARD9在炎症性肠病中的表达及其作用 被引量:5
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作者 杜晓博 赵美华 +6 位作者 马娜 高闯 杨贝贝 王丹丹 耿丽 王许平 冯百岁 《胃肠病学》 2019年第3期144-147,共4页
背景:C型凝集素结构域家族4成员D(CLEC4D)在系统性真菌感染中可诱导Th17细胞分化,调控IL-17A表达,目前国内外尚未见其在肠道免疫中是否发挥作用的报道。目的:探讨CLEC4D、CARD9在炎症性肠病(IBD)患者结肠组织中的表达情况及其临床意义... 背景:C型凝集素结构域家族4成员D(CLEC4D)在系统性真菌感染中可诱导Th17细胞分化,调控IL-17A表达,目前国内外尚未见其在肠道免疫中是否发挥作用的报道。目的:探讨CLEC4D、CARD9在炎症性肠病(IBD)患者结肠组织中的表达情况及其临床意义。方法:收集2016年10月—2018年6月郑州大学第二附属医院收治的IBD患者48例,其中溃疡性结肠炎(UC)患者36例,克罗恩病(CD)患者12例,以30例结肠癌旁正常组织作为对照。采用免疫组化法检测结肠组织中CLEC4D和CARD9表达,并分析其与临床特征的相关性。结果:UC组、CD组结肠组织中CLEC4D和CARD9表达均显著高于对照组(P <0. 05),而UC组与CD组之间无明显差异(P>0. 05)。UC组CLEC4D、CARD9表达与Mayo评分、Baron分级呈正相关(P <0. 05),CD组CLEC4D、CARD9表达与CDAI评分呈正相关(P <0. 05),与SES-CD评分无明显相关性(P> 0. 05);IBD患者CLEC4D、CARD9表达与CRP呈正相关(P <0. 05),而与ESR无明显相关性(P> 0. 05)。结论:CLEC4D、CARD9在IBD患者中的表达升高,且与患者病情密切相关,CLEC4D可能通过CARD9相关途径参与IBD的肠道免疫。 展开更多
关键词 炎症性肠病 外源凝集素类 C型 CLEC4d card9 肠道免疫
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Numeric Simulation of Single Passage Ternary Turbulence Model in Hydraulic Torque Converter 被引量:5
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作者 闫清东 魏巍 《Journal of Beijing Institute of Technology》 EI CAS 2003年第2期172-175,共4页
Based on the renormalization group theory, a hydraulic torque converter 3 D turbulent single flow passage model is constructed and boundary condition is determined for analyzing the influence of the fluid field chara... Based on the renormalization group theory, a hydraulic torque converter 3 D turbulent single flow passage model is constructed and boundary condition is determined for analyzing the influence of the fluid field characteristic and parameters on the macroscopic model. Numerical simulation of the single fluid path is processed by computational fluid dynamics and the calculated results approach to experimental data well, and especially in low transmission ratio the torque and head results are more close to experimental data than the calculated results of beam theory. This shows that the appropriate ternary analysis method and reasonable assumption of boundary condition may analyze the flow field more precisely and predict the performance of torque converter more accurately. 展开更多
关键词 hydraulic torque converter 3 d fluid field computational fluid dynamics
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A 10bit 2GHz CMOS D/A Converter for High-Speed System Applications
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作者 袁凌 倪卫宁 石寅 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第10期1540-1545,共6页
This paper presents a 2GS/s 10bit CMOS digital-to-analog converter (DAC) that consists of two unit current-cell matrixes for 6MSBs and 4LSBs, respectively, trading off between the precision and size of the chip. Cur... This paper presents a 2GS/s 10bit CMOS digital-to-analog converter (DAC) that consists of two unit current-cell matrixes for 6MSBs and 4LSBs, respectively, trading off between the precision and size of the chip. Current mode logic (CML) is used to ensure high speed,and a double centro-symmetric current matrix is designed by the Q^2 random walk strategy in order to ensure the linearity of the DAC. The DAC occupies 2.2mm × 2.2mm of die area and consumes 790mW with a single 3.3V power supply. 展开更多
关键词 d/a converter current steering CMOS mixed integrated circuit Q^2 random walk
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一种国产化高精度小体积R/D转换器设计
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作者 李芳 高群 《电子质量》 2023年第5期44-48,共5页
为了满足整机系统的高质量等级、高可靠性、高集成度、小型化和全国产化的需求,采用裸芯片组装及金属全密封封装技术方式,同时利用高精度、低温度系数薄膜电阻网络的优势,解决了R/D转换器产品高精度、高分辨率、高质量等级、小体积等方... 为了满足整机系统的高质量等级、高可靠性、高集成度、小型化和全国产化的需求,采用裸芯片组装及金属全密封封装技术方式,同时利用高精度、低温度系数薄膜电阻网络的优势,解决了R/D转换器产品高精度、高分辨率、高质量等级、小体积等方面的关键技术难题,最终实现了角度模拟信号和数字信号的相互转换,满足系统对角度参量实施量化处理与控制的需求。 展开更多
关键词 解算/数字转换器 高可靠 高集成度 高质量等级 小体积 全国产化
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Performance Optimization of Torque Converters Based on Modified 1D Flow Model 被引量:3
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作者 吴光强 王立军 《Journal of Donghua University(English Edition)》 EI CAS 2012年第5期380-384,共5页
A methodology for performance optimization of torque converters is put forward based on the one-dimensional (1D) flow model. It is found that the inaccuracy of 1D flow model for predicting hydraulic performance at the... A methodology for performance optimization of torque converters is put forward based on the one-dimensional (1D) flow model. It is found that the inaccuracy of 1D flow model for predicting hydraulic performance at the low speed ratio is mainly caused by the separation phenomenon at the stator cascade which is induced by large flow impinging at the pressure side of the stator blades. A semi-empirical separation model is presented and incorporated to the original 1D flow model. It is illustrated that the improved model is able to predict the circumferential velocity components accurately, which can be applied to performance optimization. Then, the Pareto front is obtained by using the genetic algorithm (GA) in order to inspect the coupled relationship among stalling impeller torque capacity, stalling torque ratio and efficiency. The efficiency is maximized on the premise that a target stalling impeller torque capacity and torque ratio are achieved. Finally, the optimized result is verified by the computational fluid dynamics(CFD) simulation, which indicates that the maximal efficiency is increased by 0.96%. 展开更多
关键词 multi-objective optimization torque converter separation flow Pareto front one-dimensional 1 d flow model
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COVID-19相关性肌肉减少症发生机制及防治的研究进展 被引量:1
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作者 张文典 《老年医学研究》 2023年第1期62-66,共5页
新型冠状病毒感染(COVID-19)已被世界卫生组织宣布为大流行病。研究发现,COVID-19幸存患者患急性肌肉减少症和潜在肌肉功能不全的风险增加。肌肉减少症(肌少症)是一种严重肌肉功能不全的病症,以骨骼肌质量和功能下降为特征,严重影响生... 新型冠状病毒感染(COVID-19)已被世界卫生组织宣布为大流行病。研究发现,COVID-19幸存患者患急性肌肉减少症和潜在肌肉功能不全的风险增加。肌肉减少症(肌少症)是一种严重肌肉功能不全的病症,以骨骼肌质量和功能下降为特征,严重影响生活质量,且伴随不良后果风险增加。COVID-19可通过多种机制导致肌少症的发生,包括血管紧张素转化酶2(ACE2)缺失、炎症、长期卧床与体力活动减少、缺氧、食物摄入不足、糖皮质激素应用。COVID-19相关性肌少症的防治方法很多,包括加强运动、补充蛋白质及热量、补充长链ω-3脂肪酸和补充维生素D。 展开更多
关键词 新型冠状病毒感染 肌肉减少症 血管紧张素转化酶2 缺氧 维生素d
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Numerical simulation of the flow field of a flat torque converter 被引量:6
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作者 闫清东 刘城 魏巍 《Journal of Beijing Institute of Technology》 EI CAS 2012年第3期309-314,共6页
A flexible flat torque converter was proposed to fulfill the requirement of miniaturization and power density maximization for automobiles.Constructed by two arcs joined by lines,the torus was designed directly from d... A flexible flat torque converter was proposed to fulfill the requirement of miniaturization and power density maximization for automobiles.Constructed by two arcs joined by lines,the torus was designed directly from design path.The influence of flatness on the performance of the torque converter was evaluated.The software CFX and standard k-ε model were adopted to simulate the internal flow fields of the torque converter under different flatness ratios.The results indicated that the performance of the torque converter got worse as the flatness declined,but the capacity of pump increased.The efficiency and the torque ratio dropped slightly as the flatness ratio decreased.So the torque converter could be squashed appropriately to get high power density without too much efficiency sacrifice.But when the flatness ratio was below 0.2,there was a significant drop in the efficiency. 展开更多
关键词 torque converter 3d flow simulation flatness ratio efficiency high power density
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基于D-S的特高压换流站设备故障诊断模型的建立与运用
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作者 白彦 《科学技术创新》 2023年第27期209-212,共4页
为了实现特高压换流站的智能化运维管理,基于数据融合和D-S证据理论技术,构建特高压换流站设备故障诊断模型,该模型自上而下包括数据层融合、特征层融合以及决策层融合三层结构,通过对比D-S证据合成算法、逻辑回归分类算法以及集成树分... 为了实现特高压换流站的智能化运维管理,基于数据融合和D-S证据理论技术,构建特高压换流站设备故障诊断模型,该模型自上而下包括数据层融合、特征层融合以及决策层融合三层结构,通过对比D-S证据合成算法、逻辑回归分类算法以及集成树分类算法的诊断效果,结果表明本文建立的故障诊断模型的平均召回率较逻辑回归分类算法以及集成树分类算法分别提升2.15%和1.17%,较传统故障分类算法具有一定的优越性,可在电力设备故障诊断中予以应用。 展开更多
关键词 特高压换流站 数据融合 d-S证据理论 故障诊断模型
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基于FPGA的ADS8686S采样控制器的设计与实现
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作者 刘建梁 季伟 《现代计算机》 2023年第5期113-116,共4页
在某弹载遥测项目开发中,为了实现A/D转换芯片ADS8686S对多路传感器信号的采集,设计了一种基于FPGA的传感器信号采样控制器。首先简单介绍了ADS8686S的指标参数,其次分析了芯片的并行接口控制时序,在此基础上,重点讨论了控制器的软件设... 在某弹载遥测项目开发中,为了实现A/D转换芯片ADS8686S对多路传感器信号的采集,设计了一种基于FPGA的传感器信号采样控制器。首先简单介绍了ADS8686S的指标参数,其次分析了芯片的并行接口控制时序,在此基础上,重点讨论了控制器的软件设计方案。在保证采样精度和速度的同时,控制器可对ADS8686S的工作状态进行实时监测,提高了采样的可靠性。控制器已在多次遥测试验中得到验证。 展开更多
关键词 遥测 a/d转换器 AdS8686S FPGA 采样控制器
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Analytical Modelling and Experiment of Novel Rotary Electro-Mechanical Converter with Negative Feedback Mechanism for 2D Valve
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作者 Bin Meng Mingzhu Dai +3 位作者 Chenhang Zhu Chenchen Zhang Chuan Ding Jian Ruan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2022年第5期162-182,共21页
The manufacturing of spiral groove structure of two-dimensional valve(2D valve)feedback mechanism has shortcomings of both high cost and time-consuming.This paper presents a novel configuration of rotary electro-mecha... The manufacturing of spiral groove structure of two-dimensional valve(2D valve)feedback mechanism has shortcomings of both high cost and time-consuming.This paper presents a novel configuration of rotary electro-mechanical converter with negative feedback mechanism(REMC-NFM)in order to replace the feedback mechanism of spiral groove and thus reduce cost of valve manufacturing.In order to rapidly and quantitative evaluate the driving and feedback performance of the REMC-NFM,an analytical model taking leakage flux,edge effect and permeability nonlinearity into account is formulated based on the equivalent magnetic circuit approach.Then the model is properly simplified in order to obtain the optimal pitch angle.FEM simulation is used to study the influence of crucial parameters on the performance of REMC-NFM.A prototype of REMC-NFM is designed and machined,and an exclusive experimental platform is built.The torque-angle characteristics,torque-displacement characteristics,and magnetic flux density in the working air gap with different excitation currents are measured.The experimental results are in good agreement with the analytical and FEM simulated results,which verifies the correctness of the analytical model.For torque-angle characteristics,the overall torque increases with both current and rotation angle,which reaches about 0.48 N·m with 1.5 A and 1.5°.While for torque-displacement characteristics,the overall torque increases with current yet decrease with armature displacement due to the negative feedback mechanism,which is about 0.16 N·m with 1.5 A and 0.8 mm.Besides,experimental results of conventional torque motor are compared with counterparts of REMC-NFM in order to validate the simplified model.The research indicates that the REMC-NFM can be potentially used as the electro-mechanical converter for 2D valves in civil servo areas. 展开更多
关键词 Electro-mechanical converter Magnetic circuit topology Analytical modeling 2d valve
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Ultra-high Speed and Dual-Channel Data Acquisition Card with IGSPS Based on PXI Bus
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作者 Pengyun Zhang Henan Guo 《Modern Electronic Technology》 2018年第1期22-25,共4页
This paper discusses the chief techniques and design principles of an ultra-high speed and dual-channel data acquisition card based on PXI bus, using FPGA (Field Programmable Gate Array) as logic controller cell. The ... This paper discusses the chief techniques and design principles of an ultra-high speed and dual-channel data acquisition card based on PXI bus, using FPGA (Field Programmable Gate Array) as logic controller cell. The instmment consists of pre-pro- cess circuit, A/D converter, SDRAM (Synchronous Dynamic random access memory), and control circuit integrated in FPGA. It can achieve allowing up to 1000MHz real-time sampling rate. The test result indicates that the system works normally and the system design is successful. 展开更多
关键词 High-speed data ACQUISITION Virtual Instrument PXI BUS a/d converter FPGA
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The Design of A/D Converter Circuit Adopting the Technology of PWM
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作者 Chen Ping Li Jing Zhao MingBo 《微计算机信息》 北大核心 2007年第29期272-274,共3页
This text has expounded the working principle of realizing A/D conversion that utilizes the timer within MCU and combinesthe technology of PWM. The design of hardware circuit, improved gradual approached trial arithme... This text has expounded the working principle of realizing A/D conversion that utilizes the timer within MCU and combinesthe technology of PWM. The design of hardware circuit, improved gradual approached trial arithmetic and relevant program design arediscussed in detail. And it has analyzed the resolution of A/D converter based on the technology of PWM, etc. 展开更多
关键词 PWM a/d 转换分辨率 改进逐次逼近试探算法 比较器 电路设计
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赛维华视自由人Smart TV Card
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作者 吴云卫 《个人电脑》 2005年第4期68-68,共1页
关键词 SMART card 自由 TV PCMCIA接口 笔记本电脑 硬件技术 3d游戏 影音中心 功能需求 有限公司 数码技术 采集设备 电视卡 文档 视频
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