Showing papers on "Blackfin published in 2011"

Lossy compression of EEG signals using SPIHT

Abstract: A method of compressing electroencephalographic signals using the set partitioning in hierarchical trees (SPIHT) algorithm is described. The signals were compressed at a variety of different compression ratios (CRs), with the loss of signal integrity at each CR determined using the percentage root-mean squared difference between the reconstructed signal and the original. An analysis of the computational complexity of the SPIHT algorithm is also presented, using the Blackfin processor as an example implementation target.

Utilizing the full potential of a new flexible platform in modular self-reconfigurable mobile robotics

Abstract: In this paper we show the challenges arising from the existence of multi mordular robotics. The hardware developed within the SYMBRION and REPLICATOR projects aims at the creation of a new platform being capable of acting as single robots, as a swarm of those or even of docking to each other and thereby creating a larger organism. This organism will be able to take advantage of the combined capabilities of the single robots. This includes the energy sources as well as computing power and sensors. The electronics design implemented in the projects allows to employ arbitrary topologies of the data bus without having to take care of the role each robot will fill within an organism. From the software point of view this provides an enormous flexibility, but also raises new challenges. Being flexible in terms of topology means not being aware of the actual topology implicitly. Therefore new mechanisms are needed to provide the high-level controllers with the necessary information. In this paper we will discuss some of these newly introduced capabilities as well as the according new challenges resulting out of them. We start by pointing out the hardware design principles. This includes the main-CPU which is a Blackfin DSP running μClinux as its operating system. Afterwards the most important consequences for the consecutive software are discussed.

Hardware design of ADSP-BF548 based portable patient monitor

Abstract: This paper studies on hardware design of a novel patient monitor based on one ADSP-BF548 blackfin dsp. The NIBP, 12-lead ECG, SPO2 and body temperature functions are successfully implemented. A 6.4 inch TFT LCD with a touch screen is used as GUI output to display all monitor curves and parameters. Through the convergent capabilities of the blackfin dsp, the patient moitor can store data into NAND FLASH and SD card. The Ethernet, USB and WCDMA communication functions are also realized. Another advantage of this design is the powerful DSP computation performance which can guarantee more complex algorithms into one processor system.

Implementation of GPS System using Blackfin Processor BF527

Abstract: In today’s world, human beings want to stay connected with each other and their surroundings. Global Positioning System (GPS) is one of the technologies which is used to determine the exact position of various objects. It is more widely used for military purposes. Various equipments like GPS are increasingly driven by embedded processors, also entering the picture are embedded design needs that include securing intellectual property, lowering power dissipation, minimizing cost, and cutting development time. Blackfin is one such type of processors. In this paper we implement GPS system using BF527. The Software implementation is done using VDK++.

Development Platform for Heterogeneous Wireless Sensor Networks

Abstract: A universal platform is developed to provide several interfaces that every sensor can register or communicate with each other and platform (environment). To understand the operation of the platform, sensor nodes simulated by the Blackfin processor and PCs are used. This report presents the performance of the DSN based on an experiment in which different sensor nodes are connected to the platform, send/get data to/from platform and also can communication with each other. The results of this study demonstrate the principles and implementation of distributed sensor networks which can be extended to a complete and operational sensor management environment.

Auto-Read Photoelectric Autocollimator Based on DSP and Area Array Imaging Sensors

Abstract: The paper explains an auto-read photoelectric autocollimator based on DSP and area array imaging sensors. The working principles, hardware and software of the design is interpreted. This equipment is able to conduct precise two-dimensional measurement. The embedded core Blackfin DSP BF549 is used in the device to acquire consecutive video, help store them and process the image datas. TFT screen is adopted to display the processed video results at real time. Auto-read tracking algorithm is a combined method of image interframe difference and background difference. Thus the moving target is detected in the static background. Then according to the position of the moving measuring mark calculate the angular displacement.

An embedded image processing and feedback compensation for the vibration-resistance system using white light interferometer

Abstract: The active interferometer has been approved as an effective architecture to increase the precision of surface profile measurement by detecting the environmental vibration and then stabilized by a piezoelectric transducer. The performance of such system can improve the accuracy within nano-meters. Most of the active interferometers have being implemented on the PC based platform because it is easy to be setup and modulized, However, the latency of image grabbing processing, mathematic algorithm and I/O trigger delay is around 10~15ms. Moreover, the latency is varying if different PCs are used. In this study, an embedded real-time controller based on the ADI Blackfin BF561 DSP microprocessor was developed to improve the performance of a vibration-resistance system using white-light interferometer. The purpose of this embedded control system is to detect the vibration and compensate it for White Light Interferometer when processing stepping photograph grabbing for surface profile measurement. A customized embedded control system with a 600 MHz high performance microprocessor, Camera Link interface, DAC circuit and UART command port has been developed. A complete command set has also been defined to communicate with PC based interferometer user interface for close-loop control. The latency has been reduced from tens of millimeters to 250 μs as tested for all the procedures from CCD trigger, image processing, to PZT control signal output. It has been proved to be useful of fixing the latency between phase detecting and compensation output. With this advantage, the response of the interferometer can accelerated so that the vibration-resistance is improved and the overall accuracy can be in the range of a few nano-meters.