Bone Conduction Heartbeat Detection Frequency Separation
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Solution Overview
Problem
Workers in loud environments, such as construction sites, face challenges in accurately detecting their physical and psychological stress levels due to the interference of noise with conventional bone conduction microphones, which struggle to effectively extract both audio and heartbeat information.
Innovation Solution
A heartbeat detection device that uses a bone conduction microphone to convert body surface displacements into signals, extracting both audio and heartbeat information components by filtering frequency components, allowing for the estimation of a user's physical and psychological state without the need for multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a bone conduction microphone is pressed against the body surface to obtain audio information, then audio information can be obtained, but heartbeat information cannot be effectively extracted due to noise interference
Solution Approach 1:
The patent segments the frequency spectrum into different bands, specifically separating audio information (lower frequencies) from heartbeat information (higher frequencies). The extractor divides the bone conduction signal into multiple frequency components and selectively processes each band to isolate heartbeat information from audio information and noise
Solution Approach 2:
The patent changes the parameter of frequency analysis by applying Fourier transform or wavelet transform to the bone conduction signal. This parameter transformation allows the system to view the signal in the frequency domain rather than time domain, making it possible to separate and extract heartbeat information at specific frequency bands that were previously indistinguishable in the time domain signal
2Measurement precision
If multiple sensors are used to detect both audio and heartbeat information, then detection accuracy improves, but device complexity and user burden increase
Solution Approach 1:
The patent makes the bone conduction microphone multi-functional by demonstrating that a single device can simultaneously capture both audio information and heartbeat information through frequency separation. The same sensor that records speech also records cardiac vibrations, eliminating the need for separate sensors and reducing device complexity while maintaining detection accuracy
Solution Approach 2:
The patent extracts the useful heartbeat information from the composite bone conduction signal by isolating specific frequency components. The extractor selectively removes or separates the heartbeat frequency band from the mixed signal containing both audio and physiological information, obtaining pure heartbeat data without requiring additional sensors
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 the accurate detection of both audio and heartbeat information in noisy environments, reducing the burden on the user and providing a reliable means to assess their stress levels by stabilizing signal levels and improving signal-to-noise ratios.
Implementation Method 1
a bone conduction microphone that converts, into a first signal, displacement on a body surface of a user in a thickness direction of a body of the user
Data Source
AI summary
A heartbeat detection device includes a bone conduction microphone that converts, into a signal, displacement on the body surface of a user in a thickness direction of the body of the user, and an extractor that extracts a first frequency component and a second frequency component which are included in the signal. The first frequency component is based on audio information of the user, and the second frequency component is based on heartbeat information of the user. The heartbeat detection device is capable of estimating the physical and psychological state of the user based on the heartbeat information by extracting both the audio information and the heartbeat information, from a signal that has been output by the bone conduction microphone.