摘要：There are DAC structures available in the literature for radix r = 2, 3, and 4;but how they are arrived at is missing. No general structure is available for any radix r. The aim of the paper is, therefore, to fulfil these gaps. To start with, the design relations are derived for the simplest possible attenuator circuit when connected to a voltage source V and a series resistance R, such that the complete circuit offers the Thevenin resistance R. Spread relations for this attenuator are derived. An example when 3 such attenuators with different attenuation constants are connected in cascade is given. Interestingly, the two attenuators with attenuation factors 1/2 and 1/3 have the same spread of 2. A generalized attenuator is then obtained when N number of identical attenuators are connected in cascade. This is modified to derive a digital to analog converter for any radix r.

摘要：A novel design and implementation of frequency superposition testing power supply for induction motor is proposed. An equivalent power using dynamic space voltage vector synthesis is generated to replace the two separate powers of the traditional method. The principle of frequency superposition testing is firstly introduced, and then the detailed design and implementation of the digital frequency superposition power are given. The simulation of the power supply system shows the promising results. Finally, experimental results validate the feasibility and reliability of the proposed power.

摘要：In this paper, the concept of the Shortest-Route Traffic Matrix(SRTM) was first presented, and the generalized formula for computing ring capacity requirement in use of SRTM is given. Then, a new capacity design algorithm which is based on SRTM was presented for Synchronous digital Hierarchical(SDH) Bi-directional Self-Healing Ring (BSHR). The algorithm simulation results demonstrate that this algorithm is very efficient for SDH BSHR capacity design and can make less project investment and make high utilization of lines and equipment. By means of the algorithm in this paper, capacity optimization assignment for SDH Hierarchical Self-Healing Ring (HSHR) and for ATM Virtual Path (VP)-based Self-Healing Ring (SHR) is also discussed.

摘要：在影视广告和广头中很少看到文字散去的动画效果.它的制作原理主要是利用渐变来控制Mask的变化,文字使用了Krokodove的倒角插件来完成.

摘要：本文介绍了一款开源数字电路仿真软件digital在数字逻辑和计算机组成等课程实验中的应用,并呈现出四个不同复杂度的组合和时序电路的设计与实现。实践表明,该软件适合于计算机类专业学生学习和掌握诸如处理器一类复杂数字系统设计。

摘要：Fespa Digtal 2014是具有活力以及突显新的理念和业务领域的展会,其展商和观众创下新的记录—难道这是所谓的印刷饱和吗？这一切印证了Fespa Digtal 2014是专业化的印刷展览会。对于Fespa Digtal 2014展会的印象可以这样描述：充满活力、乐观的,以及全新的理念和日益被数字印刷技术渗透的业务领域,或通过数字印刷技术产生新的业务领域。印刷具有迷人的吸引力—所有可想象的材料都可以在众多领域得到多种应用。这些应用领域从户内外广告标牌和展板、纺织品印刷,进入包装,直到＂个性化的客厅和起居室＂。

摘要：提到数字电视,相信绝大多数的消费者,甚至身处业界的读者,脑海中浮现的都是外观设计时髦新颖的各种平面显示设备,或是各式各样的机顶盒.但数字电视的内涵不仅于此,除了有形的硬设备之外,能否带给消费者全新使用体验的关键,其实在于软件.像是各种风格绚丽的电子节目表(Electronic Program Guide,EPG)、甚至可以直接透过电视遥控器进行购物消费之类的先进互动功能,都不是单凭硬件就能做到的.

摘要：谈到美国资深音响品牌Theta digital,大家会想到哪些经典之作？是强力的Prometheus后级功率放大器,还是Generation系列前级处理器？然而在家庭影院方面,则毫无疑问是从1996年开始就推出的Casablanca系列环绕声前级处理器,而新一代的Casablanca IVa更是一款全面支持各种沉浸式三维环绕声音效解码、兼容4K超高清影像传输与各类智能中控系统的强力之作。下面,我们将以Theta digital首席工程师Dave Reich的视角,深入地谈谈Casablanca系列设计上的独到之处。

摘要：digitalFusion是强大的合成系统,DPS是国内常用的编辑方案,这两款产品的结合为影视制作提供了新的解决方案。这两者结合一方面表现为操作的便捷性,时间线的整合大大提高了制作效率,不用为素材的调入调出而浪费时间,另一方面表现为工作的互补性,提供了完整的影视剪辑合成方案。DPS将实时处理的硬件技术和功能强大的非编软件相结合,在保证实时处理的同时又确保其高效性、超稳定性和易用性,是一套极佳的编辑解决方案。digitalFusion具有先进的软件设计思想,其简单的工作方法大大增强了操作效率,并且提供了全面的后期合成解决方案,基于时间线的缓存使合成工作可以部分实时播放。digitalFusion和DPS的时间线进行了整合,DPS可以直接切换到digitalFusion,并且随时在DPS剪辑系统中更新digitalFusion流程,交互操作非常方便;digitalFusion对DPS硬件进行了优化,并且为DPS提供了强大的文字功能。