Design of linear phase FIR filters using fractional derivative constraints

In this paper, the designs of linear phase FIR filters using fractional derivative constraints are investigated. First, the definition of fractional derivative is reviewed briefly. Then, the linear phase FIR filters are designed by minimizing integral squares error under the constraint that the ideal response and actual response have several same fractional derivatives at the prescribed frequency point. Next, the fractional maximally flat FIR filters are designed by letting the number of fractional derivative constraints be equal to the number of filter coefficients. Finally, numerical examples are demonstrated to show that the proposed method has larger design flexibility than the conventional integer derivative constrained methods.     

Digital predistorter with improving index accuracy of lookup table based on FPGA

In this paper, a method of function approximation for improving index accuracy of the lookup table (LUT) of digital predistortion (DPD) is proposed to obtain more accurate linearization. The algorithm utilizes approximation of the LUT with the method of Taylor Series. The power values of forward signals are divided into integers and decimals, and the corresponding LUTs are indexed respectively. The index predistortion values of forward signals are approximated by Taylor series, which improves the index accuracy of LUT significantly. Experiment shows that the performance of a DPD system is improved.     

Digital advertising around paid spaces,E-advertising industry’s revenue engine: A review and research agenda

We develop and describe a framework for research in a particular segment of digital advertising. Internet Advertising Paid Slots and Spaces (IAPS) is a neologism and work almost like a stock exchange for buying and selling advertising in various formats on designated spaces around web and make a significant contribution to Internet advertising revenues. These paid spaces were found to encompass diverse areas of Internet advertising that include search engine marketing, social media advertising and display advertising. Given the complexity of the modern digital advertising eco system, this literature review seeks to provide clarity, up-to-date knowledge and ongoing insights into Internet advertising channels, for managers making investment decisions in this context.     

一种智能化漏电保护芯片的设计

提出了一种智能化漏电保护芯片。电路基于0.6μm CMOS工艺、采用数模混合信号设计,并用全定制的方法实现。与现有模拟漏电保护芯片相比,该芯片具有较高的智能化:对输入信号是否有效进行辨识,以排除干扰,减少误动作;采用数字延时代替现有的RC延时方式,大大提高了控制精度及三级匹配;三级保护的不同应用环境的可编程性;实现智能化开关控制;具有报警功能,保障安全。由于芯片的大部分功能由数字电路实现,大大降低了功耗。通过采用全定制的方法,优化电路和版图设计,减少了芯片面积,降低了成本。     

支持预览的版权图像共享

针对数字水印技术均不考虑版权图像共享场景中用户的预览需求,以及软件控制方法和附加信息方法的局限性,该文提出一个支持直接从加密图像预览原图像部分视觉内容的版权图像共享方案。为此,将缩略图保持加密的思想引入到用户端嵌入的水印方案中,通过像素调整在加密图像上呈现原图像内容的模糊版本。用于调整的像素位被事先以信息隐藏的方法嵌入隐藏区域中,以保证解密的正确性。此外,用户水印被在解密的同时嵌入到图像中,用于实现对未授权重分发行为的追踪。这样一来,不仅满足了共享过程中用户的预览需求还同时保护了图像的版权。理论分析和实验测试的结果展现了所提方案的安全性、可行性、高效性和鲁棒性。     

Exploring the Determinants of Artificial Intelligence (AI) Literacy: Digital Divide,Computational Thinking,Cognitive Absorption

To effectively utilize artificial intelligence (AI)-based technologies such as ChatGPT and realize their novel ethical issues, individuals must have a variety of knowledge and skills about AI. Such knowledge and skills have led to the emergence of AI literacy. Despite the importance of AI literacy in everyday life, little is known about its determinants. To better understand the determinants of AI literacy, we attempted to build a research model relying on previous research and different theoretical frameworks. The model incorporated digital divide, cognitive absorption, and computational thinking. As a major finding from the current study, computational thinking was found to be a significant determinant of AI literacy, which facilitate using, recognizing, and evaluating AI-based technologies. Moreover, we found out that individuals with physical access to information and communication technologies (ICTs) are more expected to use and recognize AI. Also, motivation and skills in using ICTs enable individuals to better evaluate the outcomes of AI-based technologies. The findings also showed that convenient access to ICTs contributes to a deep involvement with AI-based technologies in the use. Further, individuals with higher motivation and skills to use AI technologies are likely to have a pleasant experience after using these technologies.     

激光水下成像系统中SD存储卡应用研究

介绍了在激光水下成像系统中,应用SD卡存储图像数据的具体方案及实施细节。包括SD卡与DSP处理器的电路连接,SPI总线的配置方法,系统软件层次结构的分析,SD卡的操作以及文件系统的移植及应用。该方案在水下成像系统的设计实现中具有应用价值。     

基于热敏电阻的数字体温计

利用MSP430系列单片机集成的段式液晶驱动模块和16位Σ-Δ模数转换器,结合高温度系数的NTC热敏电阻,设计了一种高精度低功耗便携式数字体温计。详细介绍了该系统原理框架,NTC热敏电阻特性,AD温度采样原理,16位Σ-Δ模数转换器和软件的实现。在实际应用中以高精度、低功耗、测量时间短、方便携带等优点替代传统的水银体温计。     

矢量字体在机顶盒上的实现与应用

矢量字体是一种优秀的文字显示技术,详细介绍了如何结合硬件资源实现机顶盒上矢量字体的呈现与变换.     

数字视频广播中可靠组播的实现

数字视频广播是一种新型的电视广播技术,它和计算机技术相融合,利用现有的有线电视网络实现大范围远距离的可靠内容的广播.由于不是所有的主机都需要这些报文,因此IP广播浪费了网络资源,而将IP组播技术用于数字视频广播,能有效地利用网络资源.