Earpiece Heartbeat Sensing for Low-Power On-Ear Detection
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Solution Overview
Problem
Existing earphone systems require additional components for on-ear detection, increasing cost and complexity, and consume power when detecting ambient sounds without user speech, which is inefficient.
Innovation Solution
Utilize at least one sensor on the earpiece, such as an accelerometer, contact microphone, optical sensor, or audio transducer, to detect a heartbeat, determining earpiece wear by detecting vibrations or sounds indicative of a heartbeat, and use adaptive filters to minimize external noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acoustic on-ear detection using two microphones is implemented, then on-ear detection capability is achieved, but power consumption increases due to continuous operation of loudspeaker driver amplifier
Solution Approach 1:
The patent extracts the heart rate detection function from the audio processing system and implements it using existing sensors (accelerometer, contact microphone, optical sensor, or inertial measurement unit) that can detect physiological signals independently of the loudspeaker amplifier, thereby eliminating the need for continuous amplifier operation while maintaining detection capability
Solution Approach 2:
The patent makes existing sensors multi-functional by using them for both their primary functions and heart rate detection. For example, the accelerometer used for motion detection is also utilized to detect heartbeat vibrations, eliminating the need for dedicated heart rate detection components and reducing overall power consumption
2Measurement precision
If additional components are added to the earphone for on-ear detection, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent reuses existing sensors (accelerometer, contact microphone, optical sensor, or inertial measurement unit) already present in modern earphones for the additional function of heart rate detection, eliminating the need for dedicated on-ear detection components and maintaining detection accuracy without increasing device complexity
Solution Approach 2:
The patent enables existing sensors to serve dual purposes: their original functions plus heart rate detection. The accelerometer simultaneously tracks user movement and detects heartbeat vibrations; the contact microphone simultaneously captures ambient sound and detects heartbeat sounds, making the system self-sufficient without additional components
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 detection of earpiece wear without additional components and reduces power consumption by not requiring powered loudspeaker amplifiers for ambient sound detection, while providing a method for biometric authentication using heartbeat properties.
Implementation Method 1
using an accelerometer on the earpiece to detect vibrations indicative of a heartbeat
Implementation Method 2
using a contact microphone on the earpiece to detect vibrations indicative of a heartbeat
Implementation Method 3
using an optical sensor to obtain a photoplethysmogram
Implementation Method 4
using at least one audio transducer to obtain a signal representing sound in the vicinity of the earpiece
Data Source
AI summary
A sensor on an earpiece is used to attempt to detect a signal corresponding to a heartbeat. If a heartbeat is detected, it can be determined that the earpiece is being worn by a user. The sensor may be an acoustic transducer on a surface of the earpiece that is located within the wearer's ear canal, while the earpiece is being worn normally.