Wearable Hearing Accessory With Compliant Sound Guide and Attachment Sensing
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Solution Overview
Problem
Extra-aural speakers on wearable devices suffer from performance tradeoffs in sound quality, loudness, and user privacy compared to in-ear headphones.
Innovation Solution
A hearing accessory that includes a compliant guide portion, such as a tube or wire, to direct sound waves from extra-aural speakers directly into the ear, with optional active noise cancellation functionality, and a sensor to detect the accessory's attachment for mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If extra-aural speakers are mounted on wearable devices near the ear, then the device can output sound to the ambient environment, but sound quality, loudness, and user privacy deteriorate compared to in-ear headphones
Solution Approach 1:
The system dynamically switches between two operational modes: open-air mode where the speaker emits sound to the ambient environment, and private mode where a tube connects the speaker to the ear canal for direct sound transmission. This dynamic reconfiguration allows the device to adapt to different usage scenarios, providing both ambient sound output capability and high-quality private listening when needed
Solution Approach 2:
A flexible tube serves as an intermediary element that bridges the extra-aural speaker and the user's ear canal. The tube directs sound waves from the speaker directly into the ear, creating a private acoustic pathway that maintains sound quality and privacy while allowing the speaker to remain positioned away from the ear in the wearable device
2Device complexity
If extra-aural speakers are mounted on wearable devices, then user privacy deteriorates as sound is emitted to ambient environment, but device simplicity is maintained
Solution Approach 1:
The flexible tube acts as a privacy-preserving intermediary that can be selectively deployed. When connected, it creates a private acoustic channel that prevents sound leakage to the ambient environment while maintaining the simple extra-aural speaker mounting. The tube is easily attachable and detachable, preserving device simplicity while enabling privacy protection when required
3Manufacturing precision
If a tube is added to connect speaker to ear for private mode, then sound quality and privacy improve, but device complexity increases
Solution Approach 1:
The tube is constructed from flexible material that allows it to conform to the user's ear anatomy and accommodate movement. This flexibility simplifies the connection process and reduces the need for rigid mounting structures, minimizing the increase in device complexity while still achieving direct sound transmission to the ear canal for improved sound quality and privacy
4Extent of automation
If the tube length is preconfigured, then frequency response compensation can be automated, but adaptability to different users deteriorates
Solution Approach 1:
The system automatically adjusts acoustic parameters including frequency response compensation based on the preconfigured tube length. The wearable device detects tube attachment and applies predetermined acoustic corrections optimized for that tube length, automating the tuning process while maintaining good adaptability through the flexibility of the tube material that allows user-specific positioning and fit
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
Enhances sound quality and privacy by directly delivering audio to the ear, with adjustable sound tuning and noise cancellation, improving the overall audio experience.
Implementation Method 1
a compliant guide portion configured to extend from the attachment portion to an ear of a user and transmit a sound wave to the ear
Implementation Method 2
a sensor operable to detect a coupling or decoupling of the attachment portion to the extra-aural audio unit
Data Source
AI summary
A wearable device hearing accessory comprising: an attachment portion configured to attach to an output port of an extra-aural audio unit of a wearable device; a compliant guide portion configured to extend from the attachment portion to an ear of a user and transmit a sound wave to the ear; and a sensor operable to detect a coupling or decoupling of the attachment portion to the extra-aural audio unit.