Acoustic Authentication Headset Using Ear Pinna Signature
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Solution Overview
Problem
Current biometric authentication methods for headsets, such as voiceprint matching, are inferior in accuracy and require significant computational resources or specialized sensors, making them unsuitable for low-power devices like headsets, and existing acoustic ear canal authentication methods are uncomfortable and prone to errors due to inadequate sealing.
Innovation Solution
A headset system utilizing two microphones to capture acoustic signals influenced by the user's ear, particularly the pinna, to generate a unique acoustic signature for authentication, which is compared to a predefined signature for secure user verification without the need for persistent internet connections or specialized sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voiceprint matching or other biometric authentication methods are used, then authentication capability is provided, but computational resources required increase significantly
Solution Approach 1:
The patent replaces complex computational authentication systems with an acoustic-based authentication method. Instead of using intensive voiceprint matching algorithms or specialized sensors, the system uses the natural acoustic properties of the user's ear canal and pinna to create a unique acoustic signature. This substitutes mechanical/computational processing with acoustic physics, dramatically reducing computational resource requirements while maintaining authentication reliability.
Solution Approach 2:
The authentication system utilizes the user's own ear canal and pinna structure as the authentication mechanism. The ear's natural geometry automatically creates a unique acoustic fingerprint when exposed to sound waves, eliminating the need for external specialized sensors or complex processing systems. The body itself serves as the authentication device, reducing both computational and hardware requirements.
2Measurement precision
If ear canal sealing is used for acoustic authentication, then authentication accuracy is improved, but user comfort deteriorates and errors increase due to inadequate sealing
Solution Approach 1:
The patent extracts the authentication function from the ear canal interior and relocates it to the external ear structures (pinna and ear canal opening). By using microphones positioned outside the ear canal to capture acoustic signatures reflected from or transmitted through the ear structures, the system eliminates the need for uncomfortable ear canal sealing while maintaining authentication accuracy. The essential acoustic characteristics are obtained from external measurements rather than internal sealing.
3Reliability
If specialized sensors or intensive computing are used for authentication, then authentication security is improved, but device complexity increases
Solution Approach 1:
The patent makes the headset's existing microphones and acoustic processing capabilities serve dual functions: both audio processing and biometric authentication. The same microphones used for capturing speech or ambient sound are also used to capture the acoustic signature for authentication. This multi-functionality eliminates the need for specialized authentication sensors or separate authentication hardware, reducing device complexity while maintaining security.
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 method provides a secure and accurate user authentication mechanism with a low crossover error rate, compatible with low-power devices, and does not require uncomfortable ear canal sealing, enhancing overall authentication accuracy beyond 99% when combined with other identification techniques.
Implementation Method 1
a first acoustic signal received by the first microphone is influenced by the ear of the user
Implementation Method 2
a controllable filter, configured to receive the first input signal and the second input signal and to determine at least one filter transfer function from the received first input signal and the received second input signal
Data Source
AI summary
A headset for acoustic authentication of a user is provided, the headset comprising at least a first microphone, a second microphone, a controllable filter, and an authenticator. The first microphone is arranged to obtain a first input signal. The second microphone is arranged to obtain a second input signal. The controllable filter is configured to receive the first input signal and the second input signal and to determine at least one filter transfer function from the received first input signal and the second input signal. The authenticator is configured to determine a current user acoustic signature from the at least one filter transfer function and to compare the current user acoustic signature with a predefined user acoustic signature and to authenticate the user based on the comparison of the current user acoustic signature with the predefined user acoustic signature.