Wi-Fi RADAR Head Tracking for Multi-Listener Audio Beamforming

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Solution Overview

Problem

Existing spatialized audio systems struggle to accurately determine the location and orientation of a listener's head in open spaces, leading to challenges in delivering precise spatial audio reproduction, especially when multiple listeners are present, due to variations in head-related transfer functions (HRTFs) and environmental reflections.

Innovation Solution

A Wi-Fi-based RADAR system is used to estimate the position and orientation of a listener's head by analyzing radio frequency reflections, incorporating heartbeats and respiration patterns to infer ear locations, and applying user-specific or generalized HRTFs for personalized spatial audio delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If visual cameras are used to determine listener position and orientation, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improvelistener position and orientation detection accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces visual camera-based tracking systems with Wi-Fi radio frequency-based RADAR. The Wi-Fi system uses electromagnetic wave reflections to detect head position and orientation, eliminating the need for cameras and visual processing while achieving comparable or superior measurement precision through phase and amplitude analysis of reflected RF signals.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The Wi-Fi system serves multiple functions simultaneously: it provides both spatial audio beamforming and RADAR-based head tracking using the same infrastructure. The existing Wi-Fi transceivers are repurposed to detect head position and orientation through reflected signal analysis, eliminating the need for separate dedicated tracking hardware.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple listeners are present in the environment, then adaptability is improved, but measurement precision deteriorates due to variations in HRTFs and environmental reflections

Engineering Contradiction:

Improvemulti-listener supportVSAvoidhead location and orientation accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies beamforming techniques to spatially separate and individually track multiple listeners. By directing focused audio beams toward detected head positions and analyzing reflections from specific directions, the system can distinguish between multiple listeners and accurately determine each one's position and orientation independently, even in the presence of varying HRTFs and environmental reflections.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If Wi-Fi-based RADAR is used to determine head position, then device complexity is reduced, but measurement precision may deteriorate compared to dedicated tracking systems

Engineering Contradiction:

Improvesystem simplicityVSAvoidposition and orientation detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent enhances the precision of Wi-Fi-based detection by analyzing multiple signal parameters including phase, amplitude, time of flight, and frequency shifts of reflected Wi-Fi signals. By processing these parameters through sophisticated algorithms and combining measurements from multiple transceivers, the system achieves high measurement precision comparable to dedicated tracking systems while maintaining the simplicity of using existing Wi-Fi infrastructure.

Inventive Principle:

Principle #35Parameter changes

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 approach enables precise spatial audio reproduction by accurately determining listener positions and orientations, enhancing audio fidelity and adaptability in diverse environments, even with multiple listeners, while reducing the need for visual cameras.

Implementation Method 1

A Wi-Fi-based RADAR system is used to estimate the position and orientation of a listener's head by analyzing radio frequency reflections

Methodology Applied

Scientific EffectRadio frequency reflection: Reflection

Implementation Method 2

incorporating heartbeats and respiration patterns to infer ear locations

Methodology Applied

Scientific EffectHeartbeat detection:

Implementation Method 3

A pair of HRTFs for two ears can be used to synthesize a binaural sound that seems to come from a particular point in space

Methodology Applied

Scientific EffectHead-related transfer function:

Data Source

PatentUS20250220383A1ComSense™: A Wi-Fi-Based RADAR and Audio Beamforming System

Publication Date: 2025.07.03 SATLOFF JAMES

AI summary

A system and method of targeting spatialized audio to ears of a listener, comprising sensing characteristics of an environment comprising at least one human by receiving radio frequency signals with a radio receiver; using the sensed characteristics in at least one automated processor to analyze at least one human dynamic physiological pattern of each human and estimate a body pose and head position within the environment of each human based on the sensed characteristics and the at least one human dynamic physiological pattern; and using an estimated position of the ears of each human in conjunction with a head-related transfer function in a spatial audio system to generate spatialized audio.