system for the blind development of a wearable guide · development of a wearable guide system for...
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Development of a Wearable GuideSystem for the Blind
Byung-Seop Song, PhD., Chang-Gul Kim,
Eun-Yeong Choi, PhD., Woon-Hwan Na, PhD.,
and Kun-Min Rhee, PhD.
Dept. of Rehabilitation Science & Technology,
School of Rehabilitation Science,
Daegu University, Daegu, Korea
E-mail: [email protected]
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Assistive Devices for the Blind’s Walking
1) Whitecane
2) Guidedog
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3) ETA (Electronic Travel Aid)
- Laser cane
- Mowat sensor
- SonicGuide & SonicVision
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4) Guide Robot
- Meldog - GuideCane
- NavBelt
- Guiding robot
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Use of the Assistive Device in Korea
- Hardly use the Electronic Devices
No information
Too expensive
Inconvenience
Very hard to be accustomed
Can’t hear the environmental sound
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Requirements of the Walking Assistive Device
Convenience
Suitable cost
Easy to be accustomed
Can hear the other sound
Cosmetic appearance
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Propose a Wearable Guide System
Ultrasonic Sensors: emitting: receiving
GPS module
Bone stimulator
Maincontroller
GPS Module
PDA
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System Composition
PDA
Bone conductionheadphoneUltrasonic obstacle
detection & GPS
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System Block diagram
Microprocessor PDA & TTSBluetooth Bluetooth
UltrasonicSensors
ControlSwitch GPS
Bone conductionHeadset
WirelessCommunication
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Features of the Wearable Guide System
Voice recognition & synthesis
Bone conduction stimulation
Ultrasonic obstacle detecting
Beep sound warning & voice guide
Hide the all components in the garment
GPS
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Stereo Bone Conduction Stimulation
Stimulate the skull with bone vibratorRemain the auditory canal openCan hear both the alarm signal and the environmental sound
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Ultrasonic Obstacle Detecting
Area5 down
Area4 down
Area3 down
Area2 down
Area1 down
Area5up
Area4up
Area3up
Area2up
Area1up
230cm
100cm
105cm105cm
300cm
650cm
105cm105cm
User can control the detecting areaIn case of indoor, only Area 3 is detected
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Beep Sound Modulation
• Stimulation interval by height
Height < 1m : 0.5sec
Height > 1m : 0.2sec
• Stimulation frequency by distance
distance > 1.5m : 0.5 kHz
distance < 1.5m : 1 kHz
left : 0 dB
right : 50 dB
left : 45 dB
right : 50 dB
left : 50 dB
right : 50 dB
left : 50 dB
right : 45 dB
left : 50 dB
right : 0 dB
Bone conduction stimulation
2020452020Angle(˚)
Area5Area4Area3Area2Area1Sector
• Stimulation intensity by direction (streo bone conduction sound)
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Guide Using GPS (under developing)
• Current Status- Completed the campus map- Confirmation of location and direction
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Implementation of a Vast Type Wearable Guide System
Bone conduction headset
Rechargeable battery
PDA
Ultrasonic sensors147 HourContinuoususing time
7.9Ah, 12V (Enin Universal Lithium
Battery, LG)battery
65mACurrent
consumption
1.57kg (including a 800g vest)
Total weight
60°Elevation
angle
125°azimuth
angle
300cmDistance
Detecting Range
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Obstacle Detecting Experiment
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Road Test
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Conclusion
Propose a Wearable Walking Guide System
- Convenient due to voice ordering and guide
- Easy to be accustomed
- Can hear both the alarm and environmentalsound
- Can hide the system in the garment
- Guide using GPS
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Development of a Wearable GuideSystem for the Blind
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