Smartphone Audio Impulse Capture for Personalized HRTFs
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Solution Overview
Problem
Obtaining individualized Head Related Transfer Functions (HRTFs) for sound localization is difficult and burdensome, typically requiring expensive equipment and controlled environments like anechoic chambers, leading to inaccurate sound localization and limited accessibility.
Innovation Solution
Capture audio impulse responses using a handheld portable electronic device (HPED) to generate sounds proximate to a person's ears, processing these responses to derive personalized HRTFs, and convolve sounds for accurate binaural sound localization without the need for specialized facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods using anechoic chambers and specialized equipment are used to measure HRTFs, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses a dummy head with microphones positioned in the ears to copy the acoustic response of a human head. Instead of measuring a real person directly (which would require complex controlled environments), the system measures the acoustic impulse response of a dummy head that replicates the same anatomical features, thereby achieving measurement precision without the complexity of specialized facilities
Solution Approach 2:
The patent replaces expensive, complex anechoic chamber equipment with a simple portable device that uses a dummy head and basic acoustic measurement capabilities. The system achieves sufficient measurement precision using inexpensive components that can be deployed in ordinary environments rather than requiring costly specialized infrastructure
2Measurement precision
If traditional HRTF measurement methods are used, then measurement precision is improved, but ease of operation deteriorates due to specialized facility requirements
Solution Approach 1:
By using a dummy head that copies the acoustic characteristics of a human head, the system eliminates the need for controlled anechoic chamber environments. The dummy head can be measured in ordinary rooms, making the process simple and accessible to users without requiring specialized facility access or technical expertise
Solution Approach 2:
The patent enables users to perform HRTF measurements independently using a portable device with a dummy head. The system includes automated signal generation and processing capabilities that allow ordinary users to obtain accurate HRTF data without requiring professional measurement equipment or technical assistance
3Measurement precision
If individualized HRTFs are obtained through traditional methods, then sound localization accuracy is improved, but loss of time increases due to measurement complexity
Solution Approach 1:
The patent measures the acoustic impulse response of the dummy head in advance under controlled but simple conditions. This preliminary measurement captures the essential acoustic characteristics needed for sound localization, allowing the system to quickly process and apply the HRTF data without requiring time-consuming measurements during actual use scenarios
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 binaural sound localization in 3D space, enhancing applications in augmented and virtual reality, telecommunications, and other sectors by providing individualized HRTFs directly from the user's environment.
Implementation Method 1
The microphones capture the audio impulse responses
Data Source
AI summary
A smartphone includes a camera that emits infrared light onto a face of a person holding the smartphone. The smartphone determines a distance to the person from the infrared light, builds a three-dimensional model (3D) of the face of the person, and determines individualized head-related transfer functions (HRTFs) for the person.