Wireless Earbud Positioning Using a Case-Based Antenna Array
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Solution Overview
Problem
Bluetooth-enabled devices, particularly small electronic devices like earphones, can measure distance but struggle to determine the direction of another device due to limitations in cost, power consumption, and mounting space, making it difficult to perform accurate positioning.
Innovation Solution
A wireless audio device comprising multiple antennas and processors that work together to measure the angle of arrival and distance between devices, utilizing a case to fix the distance between antennas, allowing for precise direction determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas are used to measure angle of arrival, then positioning precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple wireless audio devices (first wireless audio device and second wireless audio device) to form a collaborative antenna array system. Each device contributes its antenna measurements, and the master device integrates this data to calculate angle of arrival. This merging approach achieves precise positioning without requiring each individual device to have multiple antennas, thus reducing device complexity while improving measurement precision.
Solution Approach 2:
The wireless audio devices serve dual functions: they act as both audio output devices and positioning measurement nodes. The same antenna used for Bluetooth communication also serves for angle of arrival measurement. This multi-functionality eliminates the need for dedicated positioning hardware, reducing device complexity while maintaining measurement precision.
2Measurement precision
If multiple antennas are deployed in small devices, then positioning capability is improved, but mounting space requirements increase
Solution Approach 1:
The patent merges the positioning functionality across multiple separate wireless audio devices rather than concentrating multiple antennas in a single device. Each device maintains its compact form factor with a single antenna, while the collective system achieves the positioning capability that would require multiple antennas in one device. This resolves the space constraint for small portable devices.
3Measurement precision
If multiple antennas are used for positioning, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent reuses the existing Bluetooth communication antenna and radio frequency circuitry for dual purposes: both audio data transmission and positioning signal measurement. This eliminates the need for separate dedicated positioning hardware that would consume additional power. The same wireless infrastructure serves both audio and positioning functions, maintaining low power consumption while achieving precise direction measurement.
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
Enables accurate measurement of the angle of arrival and departure between Bluetooth devices, overcoming the limitations of single-antenna devices by using multiple antennas as an array to provide precise positioning without additional hardware.
Implementation Method 1
a first communication circuit connected to the first antenna... obtain first positioning information by receiving a positioning signal from an external electronic device
Data Source
AI summary
An example wireless audio electronic device includes a first antenna, a communication circuit, and a processor. The processor may be configured to receive a positioning signal from an external electronic device through the first antenna so as to obtain first positioning information; obtain, from a different audio device located in a case together with the wireless audio electronic device, second positioning information for the positioning signal received by the different wireless audio electronic device; determine an angle of arrival of the positioning signal based on the first positioning information, the second positioning information, and the distance between the wireless audio electronic device and the different wireless audio electronic device; and transmit a response signal including information of the angle of arrival to the external electronic device.