- •Preface
- •Contents
- •1 Disability and Assistive Technology Systems
- •Learning Objectives
- •1.1 The Social Context of Disability
- •1.2 Assistive Technology Outcomes: Quality of Life
- •1.2.1 Some General Issues
- •1.2.2 Definition and Measurement of Quality of Life
- •1.2.3 Health Related Quality of Life Measurement
- •1.2.4 Assistive Technology Quality of Life Procedures
- •1.2.5 Summary and Conclusions
- •1.3 Modelling Assistive Technology Systems
- •1.3.1 Modelling Approaches: A Review
- •1.3.2 Modelling Human Activities
- •1.4 The Comprehensive Assistive Technology (CAT) Model
- •1.4.1 Justification of the Choice of Model
- •1.4.2 The Structure of the CAT Model
- •1.5 Using the Comprehensive Assistive Technology Model
- •1.5.1 Using the Activity Attribute of the CAT Model to Determine Gaps in Assistive Technology Provision
- •1.5.2 Conceptual Structure of Assistive Technology Systems
- •1.5.3 Investigating Assistive Technology Systems
- •1.5.4 Analysis of Assistive Technology Systems
- •1.5.5 Synthesis of Assistive Technology Systems
- •1.6 Chapter Summary
- •Questions
- •Projects
- •References
- •2 Perception, the Eye and Assistive Technology Issues
- •Learning Objectives
- •2.1 Perception
- •2.1.1 Introduction
- •2.1.2 Common Laws and Properties of the Different Senses
- •2.1.3 Multisensory Perception
- •2.1.4 Multisensory Perception in the Superior Colliculus
- •2.1.5 Studies of Multisensory Perception
- •2.2 The Visual System
- •2.2.1 Introduction
- •2.2.2 The Lens
- •2.2.3 The Iris and Pupil
- •2.2.4 Intraocular Pressure
- •2.2.5 Extraocular Muscles
- •2.2.6 Eyelids and Tears
- •2.3 Visual Processing in the Retina, Laternal Geniculate Nucleus and the Brain
- •2.3.1 Nerve Cells
- •2.3.2 The Retina
- •2.3.3 The Optic Nerve, Optic Tract and Optic Radiation
- •2.3.4 The Lateral Geniculate Body or Nucleus
- •2.3.5 The Primary Visual or Striate Cortex
- •2.3.6 The Extrastriate Visual Cortex and the Superior Colliculus
- •2.3.7 Visual Pathways
- •2.4 Vision in Action
- •2.4.1 Image Formation
- •2.4.2 Accommodation
- •2.4.3 Response to Light
- •2.4.4 Colour Vision
- •2.4.5 Binocular Vision and Stereopsis
- •2.5 Visual Impairment and Assistive Technology
- •2.5.1 Demographics of Visual Impairment
- •2.5.2 Illustrations of Some Types of Visual Impairment
- •2.5.3 Further Types of Visual Impairment
- •2.5.4 Colour Blindness
- •2.5.5 Corrective Lenses
- •2.6 Chapter Summary
- •Questions
- •Projects
- •References
- •3 Sight Measurement
- •Learning Objectives
- •3.1 Introduction
- •3.2 Visual Acuity
- •3.2.1 Using the Chart
- •3.2.2 Variations in Measuring Visual Acuity
- •3.3 Field of Vision Tests
- •3.3.1 The Normal Visual Field
- •3.3.2 The Tangent Screen
- •3.3.3 Kinetic Perimetry
- •3.3.4 Static Perimetry
- •3.4 Pressure Measurement
- •3.5 Biometry
- •3.6 Ocular Examination
- •3.7 Optical Coherence Tomography
- •3.7.1 Echo Delay
- •3.7.2 Low Coherence Interferometry
- •3.7.3 An OCT Scanner
- •3.8 Ocular Electrophysiology
- •3.8.1 The Electrooculogram (EOG)
- •3.8.2 The Electroretinogram (ERG)
- •3.8.3 The Pattern Electroretinogram
- •3.8.4 The Visual Evoked Cortical Potential
- •3.8.5 Multifocal Electrophysiology
- •3.9 Chapter Summary
- •Glossary
- •Questions
- •Projects
- •4 Haptics as a Substitute for Vision
- •Learning Objectives
- •4.1 Introduction
- •4.1.1 Physiological Basis
- •4.1.2 Passive Touch, Active Touch and Haptics
- •4.1.3 Exploratory Procedures
- •4.2 Vision and Haptics Compared
- •4.3 The Capacity of Bare Fingers in Real Environments
- •4.3.1 Visually Impaired People’s Use of Haptics Without any Technical Aid
- •4.3.2 Speech Perceived by Hard-of-hearing People Using Bare Hands
- •4.3.3 Natural Capacity of Touch and Evaluation of Technical Aids
- •4.4 Haptic Low-tech Aids
- •4.4.1 The Long Cane
- •4.4.2 The Guide Dog
- •4.4.3 Braille
- •4.4.4 Embossed Pictures
- •4.4.5 The Main Lesson from Low-tech Aids
- •4.5 Matrices of Point Stimuli
- •4.5.1 Aids for Orientation and Mobility
- •4.5.2 Aids for Reading Text
- •4.5.3 Aids for Reading Pictures
- •4.6 Computer-based Aids for Graphical Information
- •4.6.1 Aids for Graphical User Interfaces
- •4.6.2 Tactile Computer Mouse
- •4.7 Haptic Displays
- •4.7.1 Information Available via a Haptic Display
- •4.7.2 What Information Can Be Obtained with the Reduced Information?
- •4.7.3 Haptic Displays as Aids for the Visually Impaired
- •4.8 Chapter Summary
- •4.9 Concluding Remarks
- •Questions
- •Projects
- •References
- •5 Mobility: An Overview
- •Learning Objectives
- •5.1 Introduction
- •5.2 The Travel Activity
- •5.2.1 Understanding Mobility
- •5.2.2 Assistive Technology Systems for the Travel Process
- •5.3 The Historical Development of Travel Aids for Visually Impaired and Blind People
- •5.4 Obstacle Avoidance AT: Guide Dogs and Robotic Guide Walkers
- •5.4.1 Guide Dogs
- •5.4.2 Robotic Guides and Walkers
- •5.5 Obstacle Avoidance AT: Canes
- •5.5.1 Long Canes
- •5.5.2 Technology Canes
- •5.6 Other Mobility Assistive Technology Approaches
- •5.6.1 Clear-path Indicators
- •5.6.2 Obstacle and Object Location Detectors
- •5.6.3 The vOICe System
- •5.7 Orientation Assistive Technology Systems
- •5.7.1 Global Positioning System Orientation Technology
- •5.7.2 Other Technology Options for Orientation Systems
- •5.8 Accessible Environments
- •5.9 Chapter Summary
- •Questions
- •Projects
- •References
- •6 Mobility AT: The Batcane (UltraCane)
- •Learning Objectives
- •6.1 Mobility Background and Introduction
- •6.2 Principles of Ultrasonics
- •6.2.1 Ultrasonic Waves
- •6.2.2 Attenuation and Reflection Interactions
- •6.2.3 Transducer Geometry
- •6.3 Bats and Signal Processing
- •6.3.1 Principles of Bat Sonar
- •6.3.2 Echolocation Call Structures
- •6.3.3 Signal Processing Capabilities
- •6.3.4 Applicability of Bat Echolocation to Sonar System Design
- •6.4 Design and Construction Issues
- •6.4.1 Outline Requirement Specification
- •6.4.2 Ultrasonic Spatial Sensor Subsystem
- •6.4.3 Trial Prototype Spatial Sensor Arrangement
- •6.4.4 Tactile User Interface Subsystem
- •6.4.5 Cognitive Mapping
- •6.4.6 Embedded Processing Control Requirements
- •6.5 Concept Phase and Engineering Prototype Phase Trials
- •6.6 Case Study in Commercialisation
- •6.7 Chapter Summary
- •Questions
- •Projects
- •References
- •7 Navigation AT: Context-aware Computing
- •Learning objectives
- •7.1 Defining the Orientation/Navigation Problem
- •7.1.1 Orientation, Mobility and Navigation
- •7.1.2 Traditional Mobility Aids
- •7.1.3 Limitations of Traditional Aids
- •7.2 Cognitive Maps
- •7.2.1 Learning and Acquiring Spatial Information
- •7.2.2 Factors that Influence How Knowledge Is Acquired
- •7.2.3 The Structure and Form of Cognitive Maps
- •7.3 Overview of Existing Technologies
- •7.3.1 Technologies for Distant Navigation
- •7.3.2 User Interface Output Technologies
- •7.4 Principles of Mobile Context-aware Computing
- •7.4.1 Adding Context to User-computer Interaction
- •7.4.2 Acquiring Useful Contextual Information
- •7.4.3 Capabilities of Context-awareness
- •7.4.4 Application of Context-aware Principles
- •7.4.5 Technological Challenges and Unresolved Usability Issues
- •7.5 Test Procedures
- •7.5.1 Human Computer Interaction (HCI)
- •7.5.2 Cognitive Mapping
- •7.5.3 Overall Approach
- •7.6 Future Positioning Technologies
- •7.7 Chapter Summary
- •7.7.1 Conclusions
- •Questions
- •Projects
- •References
- •Learning Objectives
- •8.1 Defining the Navigation Problem
- •8.1.1 What is the Importance of Location Information?
- •8.1.2 What Mobility Tools and Traditional Maps are Available for the Blind?
- •8.2 Principles of Global Positioning Systems
- •8.2.1 What is the Global Positioning System?
- •8.2.2 Accuracy of GPS: Some General Issues
- •8.2.3 Accuracy of GPS: Some Technical Issues
- •8.2.4 Frequency Spectrum of GPS, Present and Future
- •8.2.5 Other GPS Systems
- •8.3 Application of GPS Principles
- •8.4 Design Issues
- •8.5 Development Issues
- •8.5.1 Choosing an Appropriate Platform
- •8.5.2 Choosing the GPS Receiver
- •8.5.3 Creating a Packaged System
- •8.5.4 Integration vs Stand-alone
- •8.6 User Interface Design Issues
- •8.6.1 How to Present the Information
- •8.6.2 When to Present the Information
- •8.6.3 What Information to Present
- •8.7 Test Procedures and Results
- •8.8 Case Study in Commercialisation
- •8.8.1 Understanding the Value of the Technology
- •8.8.2 Limitations of the Technology
- •8.8.3 Ongoing Development
- •8.9 Chapter Summary
- •Questions
- •Projects
- •References
- •9 Electronic Travel Aids: An Assessment
- •Learning Objectives
- •9.1 Introduction
- •9.2 Why Do an Assessment?
- •9.3 Methodologies for Assessments of Electronic Travel Aids
- •9.3.1 Eliciting User Requirements
- •9.3.2 Developing a User Requirements Specification and Heuristic Evaluation
- •9.3.3 Hands-on Assessments
- •9.3.4 Methodology Used for Assessments in this Chapter
- •9.4 Modern-day Electronic Travel Aids
- •9.4.1 The Distinction Between Mobility and Navigation Aids
- •9.4.2 The Distinction Between Primary and Secondary Aids
- •9.4.3 User Requirements: Mobility and Navigation Aids
- •9.4.4 Mobility Aids
- •9.4.5 Mobility Aids: Have They Solved the Mobility Challenge?
- •9.4.6 Navigation Aids
- •9.4.7 Navigation Aids: Have They Solved the Navigation Challenge?
- •9.5 Training
- •9.6 Chapter Summary and Conclusions
- •Questions
- •Projects
- •References
- •10 Accessible Environments
- •Learning Objectives
- •10.1 Introduction
- •10.1.1 Legislative and Regulatory Framework
- •10.1.2 Accessible Environments: An Overview
- •10.1.3 Principles for the Design of Accessible Environments
- •10.2 Physical Environments: The Streetscape
- •10.2.1 Pavements and Pathways
- •10.2.2 Road Crossings
- •10.2.3 Bollards and Street Furniture
- •10.3 Physical Environments: Buildings
- •10.3.1 General Exterior Issues
- •10.3.2 General Interior Issues
- •10.3.4 Signs and Notices
- •10.3.5 Interior Building Services
- •10.4 Environmental Information and Navigation Technologies
- •10.4.1 Audio Information System: General Issues
- •10.4.2 Some Technologies for Environmental Information Systems
- •10.5 Accessible Public Transport
- •10.5.1 Accessible Public Transportation: Design Issues
- •10.6 Chapter Summary
- •Questions
- •Projects
- •References
- •11 Accessible Bus System: A Bluetooth Application
- •Learning Objectives
- •11.1 Introduction
- •11.2 Bluetooth Fundamentals
- •11.2.1 Brief History of Bluetooth
- •11.2.2 Bluetooth Power Class
- •11.2.3 Protocol Stack
- •11.2.4 Bluetooth Profile
- •11.2.5 Piconet
- •11.3 Design Issues
- •11.3.1 System Architecture
- •11.3.2 Hardware Requirements
- •11.3.3 Software Requirements
- •11.4 Developmental Issues
- •11.4.1 Bluetooth Server
- •11.4.2 Bluetooth Client (Mobile Device)
- •11.4.3 User Interface
- •11.5 Commercialisation Issues
- •11.6 Chapter Summary
- •Questions
- •Projects
- •References
- •12 Accessible Information: An Overview
- •Learning Objectives
- •12.1 Introduction
- •12.2 Low Vision Aids
- •12.2.1 Basic Principles
- •12.3 Low Vision Assistive Technology Systems
- •12.3.1 Large Print
- •12.3.2 Closed Circuit Television Systems
- •12.3.3 Video Magnifiers
- •12.3.4 Telescopic Assistive Systems
- •12.4 Audio-transcription of Printed Information
- •12.4.1 Stand-alone Reading Systems
- •12.4.2 Read IT Project
- •12.5 Tactile Access to Information
- •12.5.1 Braille
- •12.5.2 Moon
- •12.5.3 Braille Devices
- •12.6 Accessible Computer Systems
- •12.6.1 Input Devices
- •12.6.2 Output Devices
- •12.6.3 Computer-based Reading Systems
- •12.6.4 Accessible Portable Computers
- •12.7 Accessible Internet
- •12.7.1 World Wide Web Guidelines
- •12.7.2 Guidelines for Web Authoring Tools
- •12.7.3 Accessible Adobe Portable Document Format (PDF) Documents
- •12.7.4 Bobby Approval
- •12.8 Telecommunications
- •12.8.1 Voice Dialling General Principles
- •12.8.2 Talking Caller ID
- •12.8.3 Mobile Telephones
- •12.9 Chapter Summary
- •Questions
- •Projects
- •References
- •13 Screen Readers and Screen Magnifiers
- •Learning Objectives
- •13.1 Introduction
- •13.2 Overview of Chapter
- •13.3 Interacting with a Graphical User Interface
- •13.4 Screen Magnifiers
- •13.4.1 Overview
- •13.4.2 Magnification Modes
- •13.4.3 Other Interface Considerations
- •13.4.4 The Architecture and Implementation of Screen Magnifiers
- •13.5 Screen Readers
- •13.5.1 Overview
- •13.5.2 The Architecture and Implementation of a Screen Reader
- •13.5.3 Using a Braille Display
- •13.5.4 User Interface Issues
- •13.6 Hybrid Screen Reader Magnifiers
- •13.7 Self-magnifying Applications
- •13.8 Self-voicing Applications
- •13.9 Application Adaptors
- •13.10 Chapter Summary
- •Questions
- •Projects
- •References
- •14 Speech, Text and Braille Conversion Technology
- •Learning Objectives
- •14.1 Introduction
- •14.1.1 Introducing Mode Conversion
- •14.1.2 Outline of the Chapter
- •14.2 Prerequisites for Speech and Text Conversion Technology
- •14.2.1 The Spectral Structure of Speech
- •14.2.2 The Hierarchical Structure of Spoken Language
- •14.2.3 Prosody
- •14.3 Speech-to-text Conversion
- •14.3.1 Principles of Pattern Recognition
- •14.3.2 Principles of Speech Recognition
- •14.3.3 Equipment and Applications
- •14.4 Text-to-speech Conversion
- •14.4.1 Principles of Speech Production
- •14.4.2 Principles of Acoustical Synthesis
- •14.4.3 Equipment and Applications
- •14.5 Braille Conversion
- •14.5.1 Introduction
- •14.5.2 Text-to-Braille Conversion
- •14.5.3 Braille-to-text Conversion
- •14.6 Commercial Equipment and Applications
- •14.6.1 Speech vs Braille
- •14.6.2 Speech Output in Devices for Daily Life
- •14.6.3 Portable Text-based Devices
- •14.6.4 Access to Computers
- •14.6.5 Reading Machines
- •14.6.6 Access to Telecommunication Devices
- •14.7 Discussion and the Future Outlook
- •14.7.1 End-user Studies
- •14.7.2 Discussion and Issues Arising
- •14.7.3 Future Developments
- •Questions
- •Projects
- •References
- •15 Accessing Books and Documents
- •Learning Objectives
- •15.1 Introduction: The Challenge of Accessing the Printed Page
- •15.2 Basics of Optical Character Recognition Technology
- •15.2.1 Details of Optical Character Recognition Technology
- •15.2.2 Practical Issues with Optical Character Recognition Technology
- •15.3 Reading Systems
- •15.4 DAISY Technology
- •15.4.1 DAISY Full Audio Books
- •15.4.2 DAISY Full Text Books
- •15.4.3 DAISY and Other Formats
- •15.5 Players
- •15.6 Accessing Textbooks
- •15.7 Accessing Newspapers
- •15.8 Future Technology Developments
- •15.9 Chapter Summary and Conclusion
- •15.9.1 Chapter Summary
- •15.9.2 Conclusion
- •Questions
- •Projects
- •References
- •Learning Objectives
- •16.1 Introduction
- •16.1.1 Print Impairments
- •16.1.2 Music Notation
- •16.2 Overview of Accessible Music
- •16.2.1 Formats
- •16.2.2 Technical Aspects
- •16.3 Some Recent Initiatives and Projects
- •16.3.2 Play 2
- •16.3.3 Dancing Dots
- •16.3.4 Toccata
- •16.4 Problems to Be Overcome
- •16.4.1 A Content Processing Layer
- •16.4.2 Standardization of Accessible Music Technology
- •16.5 Unifying Accessible Design, Technology and Musical Content
- •16.5.1 Braille Music
- •16.5.2 Talking Music
- •16.6 Conclusions
- •16.6.1 Design for All or Accessibility from Scratch
- •16.6.2 Applying Design for All in Emerging Standards
- •16.6.3 Accessibility in Emerging Technology
- •Questions
- •Projects
- •References
- •17 Assistive Technology for Daily Living
- •Learning Objectives
- •17.1 Introduction
- •17.2 Personal Care
- •17.2.1 Labelling Systems
- •17.2.2 Healthcare Monitoring
- •17.3 Time-keeping, Alarms and Alerting
- •17.3.1 Time-keeping
- •17.3.2 Alarms and Alerting
- •17.4 Food Preparation and Consumption
- •17.4.1 Talking Kitchen Scales
- •17.4.2 Talking Measuring Jug
- •17.4.3 Liquid Level Indicator
- •17.4.4 Talking Microwave Oven
- •17.4.5 Talking Kitchen and Remote Thermometers
- •17.4.6 Braille Salt and Pepper Set
- •17.5 Environmental Control and Use of Appliances
- •17.5.1 Light Probes
- •17.5.2 Colour Probes
- •17.5.3 Talking and Tactile Thermometers and Barometers
- •17.5.4 Using Appliances
- •17.6 Money, Finance and Shopping
- •17.6.1 Mechanical Money Indicators
- •17.6.2 Electronic Money Identifiers
- •17.6.3 Electronic Purse
- •17.6.4 Automatic Teller Machines (ATMs)
- •17.7 Communications and Access to Information: Other Technologies
- •17.7.1 Information Kiosks and Other Self-service Systems
- •17.7.2 Using Smart Cards
- •17.7.3 EZ Access®
- •17.8 Chapter Summary
- •Questions
- •Projects
- •References
- •Learning Objectives
- •18.1 Introduction
- •18.2 Education: Learning and Teaching
- •18.2.1 Accessing Educational Processes and Approaches
- •18.2.2 Educational Technologies, Devices and Tools
- •18.3 Employment
- •18.3.1 Professional and Person-centred
- •18.3.2 Scientific and Technical
- •18.3.3 Administrative and Secretarial
- •18.3.4 Skilled and Non-skilled (Manual) Trades
- •18.3.5 Working Outside
- •18.4 Recreational Activities
- •18.4.1 Accessing the Visual, Audio and Performing Arts
- •18.4.2 Games, Puzzles, Toys and Collecting
- •18.4.3 Holidays and Visits: Museums, Galleries and Heritage Sites
- •18.4.4 Sports and Outdoor Activities
- •18.4.5 DIY, Art and Craft Activities
- •18.5 Chapter Summary
- •Questions
- •Projects
- •References
- •Biographical Sketches of the Contributors
- •Index
481 Disability and Assistive Technology Systems
1.A profoundly deaf person
2.A severely visually impaired person who has tunnel vision and can read
(b)Use the CAT model components to compare and contrast what the model reveals about appropriate provision of an obstacle avoidance technology for a blind and mobile person in a country in Western Europe and a country in Sub-Saharan Africa.
(c)Use the CAT model:
1.To specify an accessible lift technology which can be used by a blind wheelchair user.
2.To investigate the provision of accessible computers for a sighted profoundly deaf person whose first language is a sign language. The accessible computer is to be sited and used in a public library facility which provides access to the Internet and general computing facilities, including word processing and spreadsheets.
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