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iBadge and Sylph Design of a Wearable Sensor Badge for Smart Kindergarten

Alessandro Costa Pereira Martin Adolph Supervisor: Dr. Waltenegus Dargie Date: 16.01.2007. iBadge and Sylph Design of a Wearable Sensor Badge for Smart Kindergarten. Motivation Concept iBadge Architecture Main Functional Units Software Focus on Speech Recognition Sylph middleware

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iBadge and Sylph Design of a Wearable Sensor Badge for Smart Kindergarten

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  1. Alessandro Costa Pereira Martin Adolph Supervisor: Dr. Waltenegus Dargie Date: 16.01.2007 iBadge and SylphDesign of a Wearable Sensor Badge for Smart Kindergarten

  2. iBadge - The Wearable Sensor Badge Motivation Concept iBadge Architecture Main Functional Units Software Focus on Speech Recognition Sylph middleware Design Overview Components Sylph Query Language Related Work and Conclusion References Outline

  3. iBadge - The Wearable Sensor Badge Motivation “Smart Kindergarten” – smart problem solving environment for early childhood education Provide parents and teachers with the abilities to comprehensively investigate students’ learning processes. Capture interaction between the kids, the teachers, common classroom objects. Collect, manage and fuse the information of sensors in logical and user-friendly manner. Project of UCLA [PaLS02]

  4. iBadge - The Wearable Sensor Badge Motivation Therefore: Wearable sensing and computing architecture. Critical design constraints: form factor, energy consumption, cost, design flexibility, various sensing functionalities. Light and small, operation time 4-6hrs/day. Wireless communication of „person to physical world“ interaction. Strong focus on speech recognition. iBadge: a light-weight power-aware sensor-instrumented badge Sylph: a sensor middleware infrastructure

  5. iBadge - The Wearable Sensor Badge Concept [PaLS02]

  6. iBadge - The Wearable Sensor Badge Concept iBadge Node Developed with COTS components DSP, Microcontroller, standard interfaces Architecture elements: Sensing Infrastructure: includes video cameras, microphones, motion detectors and iBadges. iBadges will enable higher layer services to discover and keep track of context information about the students and the toys. Network Infrastructure: allows interconnections between sensor devices to the wired backbone that runs the sensor middleware through use of several access points (e.g. Bluetooth for iBadge, analog UFH/VHF for wireless microphones). Middleware infrastructure “Sylph”: provides various services that process, store, fuse, manage and present the data that either have been collected or are being collected from Sensing Infrastructure.

  7. iBadge - The Wearable Sensor Badge iBadge - Architecture [PaLS02]

  8. iBadge - The Wearable Sensor Badge iBadge – Main Functional Units Speech Recognition Unit * DSP (120MHz & 128kB), Codec chip (16kHz Samples@16bits), Microphone, Loudspeaker Wireless Communication Unit * Bluetooth module (ARM core, flash memory and wireless transceiver). Communicates with ATMEGA through its RS232 port. Power Management/Tracking Unit Has the control of Switches Environment Sensing Unit * Sensors: Light intensity, Humidity, Air pressure and Temperature. Temperature Sensor has proprietary Dallas bus.

  9. iBadge - The Wearable Sensor Badge iBadge – Main Functional Units Localization Unit (3D) RFM Radio Orientation & Tilt Sensing Unit 2 dual-axis accelerometers and single tri-axis magnetometer Power Supply Unit 3,6 Lithium-ion battery with 800mAh. Stable output set to 3,3 V @ max. 2A.

  10. iBadge - The Wearable Sensor Badge iBadge – Main Functional Units [PaLS02]

  11. iBadge - The Wearable Sensor Badge iBadge – Software Connects to the middleware. Different applications can have different requirements for delivering the same sensor information. Same software structure runs on ATMEGA and DSP (through hardware abstract layer). Same code could run on both processors. [Loch02]

  12. iBadge - The Wearable Sensor Badge iBadge – Software ATMEGA Tasks Both tables: [Loch02] DSP Tasks

  13. iBadge - The Wearable Sensor Badge iBadge – Software Loop execution of tasks [Loch02]

  14. iBadge - The Wearable Sensor Badge iBadge – Signal Path Exemplary signal path [Loch02]

  15. iBadge - The Wearable Sensor Badge iBadge – Speech Recognition Two speech-processing scenarios are implemented on iBadge: codec software compresses the speech signal and iBadge sends it over the Bluetooth interface to the wired network infrastructure at a bit rate of 64kBit/s. The server can use the information to replay speech or it can run speech recognition on the signal. the entire Front-End Processing for distributed speech recognition takes place on iBadge. The process includes segmentation of speech into overlapping frames utilized as a basis for the computation of the so-called speech feature vectors. Computation-intensive.

  16. iBadge - The Wearable Sensor Badge iBadge – Speech Recognition [Loch02]

  17. iBadge - The Wearable Sensor Badge iBadge – Speech Recognition Test results [Loch02]

  18. iBadge - The Wearable Sensor Badge Sylph Middleware, lightweight, extensible proxy service for handling service discovery and mediating access. Designed to provide common framework for wide variety of devices using strong abstraction layers. Sensor developer should remain unaware of high-level interfaces. Application should simply enlist sensors and submit queries.

  19. iBadge - The Wearable Sensor Badge Sylph - Components Sensor module Initializes and accesses sensor devices including iBadge When loading a sensor: proxy core reads in an XML configuration file, passes a set of parameters to the module User can configure a sensor module by modifying simple attribute-value pairs in the configuration file common interface for receiving directives from the proxy core and returning data consists completely of commands to SET and GET attributes

  20. iBadge - The Wearable Sensor Badge Sylph - Components Service discovery module Allows Sylph to advertise the presence of managed devices to sets of client applications Sensor modules first register their sensors by providing information in a standard format, including available attributes, data types, and other built-in characteristics advertises presence of new sensors through a standard discovery mechanism allows application to send text-based queries to the middleware and receive data values in response uses Sun’s Jini discovery service

  21. iBadge - The Wearable Sensor Badge Sylph - Components Proxy core module forms the heart of Sylph middleware, tying together sensor modules and service discovery modules while managing system resources updates data structures to track sensor devices and user applications parses incoming requests to form query plans and processing trees provides an extensible framework for the addition of specialized features (as mobility support, dynamic query optimization, quality-of-service control) when sensor module registers a device, proxy core assigns it a unique sensor identifier when client issues a query, proxy core provides a unique request identifier

  22. iBadge - The Wearable Sensor Badge Sylph Query Language From the application’s point of view, Sylph acts as a flexible data retrieval system READ <data tuple>[WHERE <predicate clause>][EVERY <time interval>][FOR <duration>] READ temperature, pressureEVERY 1 minute FOR 1 hour READ x, y, zWHERE volume > 70FOR 30 samples

  23. iBadge - The Wearable Sensor Badge Related Work Xerox Parc: Active Badge Project – IR sensors to locate badge's wearer in office environment RIT Stockholm: Smart-Badge system – IR UC Berkeley: Smart dust - tiny sensors with micro-electro-mechanical systems constantly evaluate and react to changes in the environment

  24. iBadge - The Wearable Sensor Badge Conclusion iBadge combines Speech processing capability; Location sensing; Environment sensing; Wireless radio; Power monitoring/tracking unit; Has the size of a small pager that can be worn by pre-school children. Sylph middleware infrastructure provides An abstraction layer for initializing and accessing raw physical sensors while employing means of advertising the available sensor services to the higher layers.

  25. iBadge - The Wearable Sensor Badge References [Loch02] Locher, I. R.: Design and Implementation of iBadge and its Distributed Speech Processing Capability. Master Thesis, University of California, Los Angeles, 2002. [PaLS02] Park, S.; Locher, I.R.; Srivastava, M.: Design of a Wearable Sensor Badge for Smart Kindergarten. 6th International Symposium on Wearable Computers (ISWC2002), Seattle, WA, October 7-10, 2002. iBadge Website: http://nesl.ee.ucla.edu/projects/ibadge/default.htm

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