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In practical application, the statistical characteristics of signal and noise are usually unknown or can't have been learned so that we hardly design fix coefficient digital filter. In allusion to this problem, the theory of the adaptive filter and adaptive noise cancellation are researched deeply in the thesis. According to the LMS and the RLS algorithms realize the design and simulation of adaptive...
A monitoring system based on the embedded Internet technology for embedded devices is designed and implemented. The Browser/Server mode is adopted in this monitoring system and the realization technologies of an embedded Web server, which includes a thin TCP/IP stack, an embedded file system and a device gateway, are discussed in details. The way of embedding the Web server in the device makes it...
In this paper, a model of Embedded DC Motor Ethernet Control System is proposed with analysis on transmission time delay and data packet dropout. Based on this model, the ECS is described as a two-state asynchronous dynamical system with output feedback control and then implemented on a platform which uses a PC as a central controller and an ARM9 kit as a remote controller. As a key part of developments,...
A code replacement technique and tool were proposed in this paper, which can be used in embedded systems to fulfill the needs, module updating and debugging and defects modifying and otherwise, and promised that never disturb the system's routine running. The technique could be used in critical application areas for module updating and debugging, also some special areas which had some other requirement...
In order to increase transfer rate and enhance performance in mass data transmission and storage in real time system, a high performance Serial Advanced Technology Attachment generation 2(SATA II) host controller is proposed in this paper. This paper presents how to improve the hardware performance in course of implementation and validation. The controller was designed using VHDL and developed in...
As more and more embedded network devices appear, in order to meet changes of the function requirement or to fix bugs of software, these devices need to be online-updated at any moment. However, the online-update which updates the applications or the kernel of the embedded devices should be completed in the bootloader for safety considerations. Restricted by the storage capacity, the embedded device...
Distributed, real-time and embedded (DRE) systems with high confidence demands can benefit from dynamic reconfiguration technology to adjust and reconfigure system resources at runtime in response to the running state and normal or abnormal events. Reconfiguration is also the key technology for mission computing and the software system dynamic evolution. Monitoring the key objects of the system and...
The gateway realizes the fusion of wireless sensor network and external network. Some low performance gateways cannot meet the requirement of surge data collection. Consequently, a gateway that based on PXA270, using embedded Linux is designed to meet the requirement. To protect the data that transmitted by Ethernet through the gateway, a TCP/IP strategy is constituted, which can reduce the probability...
Software/hardware engineering (SHE) is a model-driven system-level design methodology for hardware/software systems and embedded systems. It assists a designer in both the development of models for analysis purposes and the actual realisation of the system; and the toolset of SHE is the result of software engineering research with a very strong foundation in formal theories/methods. In the recent...
This paper presents the design and implementation of franking machine control system using an embedded microcontroller. An ARM9 microcontroller and embedded real-time operating system RTAI-Linux were employed to implement the machine control and postage management. The implementation methodologies for embedded control system and franking mechatronic drive were studied. The test results show that the...
AC sampling technique is the foundation of computer aided electrotechnics measurement. In practical applications, in order to improve the accuracy of electrotechnics measurement, especially to improve the accuracy of power measurement, it is very difficult for engineers to design both the software and hardware of AC sampling. (Usually the circuits are bulky and the software is quite complex.) This...
FPGAs are increasingly being used to design high-end computationally intense microprocessors capable of implementing floating-point operations based hardware accelerators. In this paper, the throughput was improved by increasing the number of pipelining stages of the floating-point adder, and the feasibility of advancing the system clock rate was researched by making the most of plenty of flip-flops...
The emerging coding standard H.264 is mainly intended for video transmission in many areas. Considering the peculiarity of High-Definition TV (HDTV) encoding, the fast development of parallel technology and high-speed DSPs, the efficient hardware architectures were researched for the algorithm of H.264 encoding. After analyzing the experiment results from different platforms, we discussed the application...
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