This paper presents a non-contact memory card and a host employing simultaneous data and power transmission through inductive coupling. Nested clover-shaped data coils are proposed for reducing interference from a power link. The host wirelessly tracks current consumption of the card and adjusts transmit power to improve power transfer efficiency. The prototype is implemented in 65nm CMOS. It achieves 6Gb/s data rate and almost 10% power transfer efficiency over a 100-2kΩ range of the load.
IntroductionNon-contact memory cards are attractive for their higher reliability due to the lack of mechanical contact. A wireless data link for the non-contact memory cards is proposed in [1]. In order to completely remove mechanical contact, power should be also delivered wirelessly. There are two issues. One is interference between the power and the data links. Time-interleaved power and data transmission in [2] reduces the interference but degrades the data rate. Another issue is large fluctuations in the memory card power consumption as depicted in Fig.1. Transmitting always the maximum power reduces power transfer efficiency at high load resistances. Load tracking is needed. Fig.1 illustrates the proposed wireless memory card. Nested clover coils reduce the interference from the power link, enabling simultaneous power and data transmission. This simultaneous transmission permits the host to track the load fluctuations and to optimize the transmit power accordingly.
In this paper we propose an electronic travel aid system for the visually impaired that utilizes interactive sonification of U-depth maps of the environment. The system is comprised of a depth sensor connected to a mobile device and a dedicated application for segmenting depth images and converting them into sounds in real time. An important feature of the system is that the user can interactively select the 3D scene region for sonification by simple touch gestures on the mobile device screen. The sonification scheme is using stereo panning for azimuth angle localization of scene objects, loudness for their size and frequency for distance encoding. Such a sonic representation of 3D scenes allows the user to identify the geometric structure of the environment and determine the distances to potential obstacles. The prototype application was tested by three visually impaired users who managed to successfully perform indoor mobility tasks. The system's usefulness was evaluated quantitatively by means of system usability and task-related questionnaires.
The application of the proposed Simulation Oriented Layer in the embedded-software architecture is shown in this paper. The SOL’s purpose is to deliver only limited and highly desirable microprocessor-system functionality to the Application Layer, which would be implemented in a virtual simulator without requiring its complex development. It was used in two virtual simulators of embedded systems, as presented in the article. Each virtual simulator covers one customized embedded system (RPILAB and TMSLAB) used for didactical purposes. On each embedded platform, a different method of system-functionality simulation was shown. Presented virtual simulators can run recompiled (for the virtual-simulator platform) programs in a seamless process, giving real-like experiences for programmers, who can verify and test their high-level solutions. Being accurately chosen, taken for the simulation because of essential and limited functionality, and used in the Application Layer allowed for the rapid design of the virtual simulators. Unit- and functional-test results using RPILAB- and TMSLAB-embedded systems and their virtual simulators are shown in this paper. Both simulators of real RPILAB and TMSLAB platforms are used with success in the didactical process, at the Institute of Automatic Control in Lodz University of Technology, since the COVID-19 pandemic.
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