Audio Navigation for Visually Impaired Using Acoustic Beacons
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Solution Overview
Problem
Current audio navigation systems for the visually impaired are either costly, cumbersome, or difficult to use, as they rely on complex algorithms, expensive infrastructure, or require additional devices that can be cumbersome for individuals with limited dexterity.
Innovation Solution
An audio navigation system utilizing Bluetooth low energy beacons that communicate with a mobile device to provide location-based information and turn-by-turn directions, allowing users to navigate through spaces independently by leveraging existing mobile technology and accessible interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID technology with frequency sensors buried in pavement is used, then navigation capability is provided, but device complexity and installation cost increase significantly
Solution Approach 1:
The patent replaces the mechanical RFID sensor embedding system with acoustic signal processing. Instead of burying frequency sensors in pavement, the system uses the mobile device's existing microphone to detect acoustic signals from navigation markers, converting a mechanical embedding problem into an acoustic detection solution that leverages existing hardware.
Solution Approach 2:
The mobile device's microphone, already present for phone calls and media playback, is repurposed for navigation signal detection. This self-service approach eliminates the need for separate dedicated sensors, reducing overall system complexity while maintaining navigation functionality.
2Loss of information
If infrared audible signs are used, then navigation information is provided, but installation cost and device burden increase
Solution Approach 1:
The mobile device's microphone serves multiple functions: phone calls, media playback, and navigation signal detection. By making the detection component universal rather than dedicated, the system eliminates the need for separate infrared receivers or specialized hardware, significantly reducing installation costs and device burden.
Solution Approach 2:
Instead of using expensive infrared transmission systems, the patent employs acoustic signal copying that can be detected by existing microphones. The navigation markers emit acoustic signals that are free copies of the navigation information, accessible to any device with a microphone, eliminating the need for costly infrared infrastructure.
3Loss of information
If hand held infrared devices are used, then navigation signals are received, but ease of operation deteriorates for visually impaired users
Solution Approach 1:
The mobile device's microphone automatically detects navigation signals without requiring the user to manually point or orient the device. The system continuously listens for acoustic signals from all directions, providing hands-free operation that is particularly convenient for visually impaired users who need to use their hands for other tasks.
Solution Approach 2:
Instead of requiring the user to actively point the device at the navigation source (as with infrared systems), the system inverts the approach by having the microphone passively receive acoustic signals from any direction. This inversion transforms an active pointing task into a passive reception process, greatly improving ease of operation.
Data Source
AI summary
A navigation system featuring audio prompts including: a database including a plurality of beacon identifiers corresponding to physical beacons that are members of quadrants including one or more beacons, the database including navigation instructions between beacons in a quadrant and between beacons and adjacent quadrants; a controller adapted to: provide a first beacon and a destination beacon, determine a route from the first beacon to the destination beacon in a destination quadrant, provide, via the user interface, navigation instructions from the first beacon to a first quadrant of the route, for each quadrant along the route: receive, a newly encountered beacon identifier; and provide navigation instructions for the user to navigate from the newly encountered beacon to the next quadrant in the ordered list, and upon receiving a beacon identifier of a detected beacon in the destination quadrant, provide navigation instructions to navigate from the detected beacon to the destination beacon.