Ultrasonic Ranging for Mobile Devices Using Time-of-Flight
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Solution Overview
Problem
Current mobile devices lack an efficient method to facilitate communication and data sharing between proximate devices, especially in environments where traditional communication methods are limited.
Innovation Solution
Implementing ultrasonic ranging technology in mobile devices, which includes an ultrasound transmitter and receiver to calculate the distance between devices using time lapse measurements, and optionally combining with radio frequency signals for enhanced accuracy and data transfer, while mitigating interference with audio signals through filtering mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional communication methods are used between mobile devices, then devices can communicate over long distances, but communication efficiency and speed are reduced when devices are in close proximity
Solution Approach 1:
The system dynamically switches between ultrasound and RF communication modes based on the distance and environmental conditions. When devices are in close proximity, ultrasound communication is activated for high-speed data transfer, while RF communication is used for longer distances or when ultrasound interference is detected, creating an adaptive communication system that optimizes performance based on real-time conditions
Solution Approach 2:
The system changes the communication parameter (mode) based on operating conditions. By monitoring signal strength, distance estimates, and environmental factors, the system transitions between different communication parameters (ultrasound vs. RF modes) to optimize both speed and adaptability across various environments
2Speed
If ultrasound signals are used for ranging and communication, then communication speed between proximate devices is improved, but signal interference with audio signals occurs
Solution Approach 1:
The audio output spectrum is segmented into different frequency bands. The ultrasound communication signals are transmitted in the ultrasonic frequency range (above human hearing), while the audio output is confined to the audible range. This frequency segmentation allows both functions to operate simultaneously without mutual interference, as the ultrasound signals and audio signals occupy distinct frequency segments of the spectrum
Solution Approach 2:
A frequency-selective filter acts as an intermediary between the audio output and the air medium. The filter allows ultrasound frequencies to pass through while blocking audible audio frequencies, enabling ultrasound communication signals to be transmitted without interfering with audio playback and vice versa
3Reliability
If multiple frequency bands are used for ultrasound transmission, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The system dynamically selects which frequency bands to use based on real-time conditions such as signal quality, interference levels, and environmental factors. Rather than continuously operating all frequency bands, the system activates only the necessary bands, reducing processing complexity while maintaining reliability through adaptive multi-band operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This technology allows for versatile and effective communication and data sharing between mobile devices in various environments, increasing their versatility and precision in determining proximity and orientation, while minimizing signal interference.
Implementation Method 1
an ultrasound transmitter capable of emitting an ultrasound signal for detection by a proximate device
Implementation Method 2
The mobile device can then use a time lapse associated with one or both of these ultrasound signals to find a range to the proximate device
Implementation Method 3
an ultrasound receiver capable of receiving an ultrasound signal from the proximate device
Implementation Method 4
mitigating interference with audio signals through filtering mechanisms
Data Source
AI summary
Ultrasonic ranging for mobile devices is disclosed. A mobile device using ultrasonic ranging can include an ultrasound transmitter capable of emitting an ultrasound signal for detection by a proximate device and an ultrasound receiver capable of receiving an ultrasound signal from the proximate device. The mobile device can then use a time lapse associated with one or both of these ultrasound signals to find a range to the proximate device.