Audio Spatialization via Camera Head Tracking
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Solution Overview
Problem
Existing audio technologies struggle to accurately recreate three-dimensional sound, as they do not account for the user's position and orientation in space relative to the sound system, leading to a lack of immersive audio experience, especially when using headphones.
Innovation Solution
Incorporating a camera input on processor-based devices to track the user's position and orientation, allowing for real-time adjustment of audio latency and amplitude to create a more immersive three-dimensional audio experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional stereo audio systems are used, then device complexity is low, but audio spatialization accuracy deteriorates
Solution Approach 1:
The patent introduces camera-based head tracking as an intermediary system that captures user orientation and position data, which then informs audio rendering decisions. This mediator bridge between physical head movement and digital audio output enables accurate spatialization without requiring complex multi-speaker hardware configurations.
Solution Approach 2:
The patent replaces traditional mechanical audio spatialization systems (multiple speakers, acoustic mirrors, or binaural microphones) with a computational approach using camera tracking and software-based audio rendering. This substitution of mechanical/acoustic systems with optical sensing and digital signal processing achieves superior spatial accuracy with simpler hardware.
2Measurement precision
If camera tracking is added to track user position and orientation, then audio spatialization improves, but device complexity increases
Solution Approach 1:
The patent leverages the camera system's existing functionality for visual content and repurposes it for audio spatialization tracking. By making the camera multi-functional—serving both visual display purposes and head orientation detection—the system achieves accurate spatial tracking without adding dedicated sensing hardware.
Solution Approach 2:
The system uses the device's own existing camera and processing capabilities to enable audio spatialization, rather than requiring external or specialized tracking equipment. The device serves itself by utilizing its built-in optical sensors and computational resources for both visual and auditory spatial awareness.
3Adaptability or versatility
If real-time audio adjustment based on head movement is implemented, then immersive audio experience improves, but processing requirements increase
Solution Approach 1:
The patent implements periodic sampling of head position and orientation at optimized intervals rather than continuous tracking. This periodic action allows the system to update audio spatialization parameters at sufficient rates for immersion while avoiding the excessive processing demands of truly continuous real-time adjustment.
Solution Approach 2:
The system pre-calculates and stores transfer functions and audio rendering parameters for various head orientations and positions. When the camera detects head movement, it simply retrieves pre-computed spatialization data rather than performing complex real-time audio processing, reducing instantaneous processing requirements while maintaining adaptability.
Data Source
AI summary
An apparatus includes at least one memory, instructions, and processor circuitry to execute the instructions to track movement of a head of a user wearing earphones, the earphones to move with the movement of the head of the user, the earphones to be communicatively coupled to a computing device. The processor circuitry is to obtain media content, the media content including first audio data for a first channel and second audio data for a second channel. The processor circuitry is to adjust, based on the movement of the head of the user, the first audio data for the first channel and the second audio data for the second channel. The processor circuitry is to cause the adjusted first audio data and the adjusted second audio data to be played by the earphones.