Personalized HRTF and ITDF Estimation via Self-Service Audio
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Solution Overview
Problem
Current 3D sound technology in virtual reality lacks personalized head-related transfer functions (HRTF) and interaural time difference functions (ITDF), leading to inaccurate sound localization, particularly in distinguishing front from back, due to the use of generalized settings that do not account for individual differences in ear anatomy.
Innovation Solution
A computer program and method to estimate personalized HRTF and ITDF using a simple test arrangement at home, without requiring specialized equipment, by capturing audio and orientation data from a user, which are then processed to provide accurate directional cues for a more immersive 3D audio experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If generalized HRTF and ITDF are used to work for a wide audience, then the device complexity and cost are reduced, but the measurement precision and reliability of sound localization deteriorate
Solution Approach 1:
The system enables users to measure their own personalized HRTF and ITDF using simple equipment (headphones, microphone, and software) without requiring complex measurement infrastructure. The user performs self-measurement by listening to test signals and providing feedback, eliminating the need for professional anechoic chambers and expert operators while achieving high measurement precision
Solution Approach 2:
The patent replaces complex mechanical measurement systems (anechoic chambers, precision positioning equipment, multiple microphones) with an acoustic-based self-measurement system using headphones and software. The mechanical complexity is substituted by computational methods and acoustic feedback loops that guide users through the measurement process
2Measurement precision
If traditional HRTF measurement methods using anechoic chambers are used, then the measurement precision is improved, but the ease of operation and accessibility deteriorate
Solution Approach 1:
Users can perform their own HRTF and ITDF measurements at home using consumer-grade equipment and software. The system provides step-by-step guidance and automated processing, making the previously expert-only measurement process accessible to ordinary users without requiring travel to specialized facilities
Solution Approach 2:
The patent extracts the essential measurement function from complex institutional infrastructure (anechoic chambers) and implements it in a simplified home environment. By separating the core acoustic measurement task from the surrounding complex infrastructure, the system makes high-precision measurement accessible anywhere with basic audio equipment
3Reliability
If personalized HRTF and ITDF are determined for each user, then the reliability of sound localization is improved, but the productivity and scalability of the system deteriorate
Solution Approach 1:
The measurement process uses periodic presentation of test signals at different frequencies and time delays, allowing automated collection of measurement data through repeated trials. This periodic structure enables systematic gathering of HRTF and ITDF information across the audible spectrum without requiring manual intervention for each measurement point
Solution Approach 2:
The patent replaces time-consuming manual measurement and processing with automated computational methods. Software algorithms automatically analyze the user's responses to test signals, compute personalized HRTF and ITDF, and generate the final audio profile, dramatically increasing productivity while maintaining measurement precision
Data Source
AI summary
A method of estimating an individualized head-related transfer function (HRTF) and an individualized interaural time difference function (ITDF) of a particular person, comprising the steps of: a) obtaining a plurality of data sets (Li, Ri, Oi), each comprising a left and a right audio sample (Li, Ri) from a pair of in-ear microphones, and orientation information (Oi) from an orientation unit, measured in a test-arrangement whereby an acoustic test signal is rendered via a loudspeaker; b) storing the data sets in a memory; c) estimating the directions of the loudspeaker relative to the person based on the orientation data and the audio data; d) estimating the ITDF based on the data sets and on the estimated relative position/orientation; e) estimating the HRTF, based on the data sets and based on the estimated relative position/orientation.