Position-Aware Acoustic Crosstalk Cancellation for Head Movement
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Solution Overview
Problem
Conventional audio playback systems struggle with crosstalk between left and right audio channels, particularly when users move or rotate their heads, leading to inadequate crosstalk cancellation performance in three-dimensional spaces.
Innovation Solution
An audio processing system determines a user's position and orientation within an environment, uses a dimensional map to identify transfer functions, and applies these functions to generate crosstalk cancellation filters for speakers to minimize or eliminate crosstalk by modifying audio signals based on the user's location and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional crosstalk cancellation techniques are used, then crosstalk cancellation performance is improved at a specific point, but the system breaks down when the user moves or rotates their head
Solution Approach 1:
The system dynamically adapts crosstalk cancellation filters based on real-time user position and orientation changes. Instead of using static filters designed for a fixed listening position, the system continuously updates the transfer functions and corresponding cancellation filters to match the user's current head position and orientation, thereby maintaining effective crosstalk cancellation throughout three-dimensional space
Solution Approach 2:
The patent extends crosstalk cancellation from a single-point solution to a three-dimensional spatial solution by incorporating user position coordinates (x, y, z) and orientation angles (azimuth, elevation) into the filter design. This dimensional expansion allows the system to select appropriate transfer functions based on the user's location in space, transforming the problem from two-dimensional (frequency domain only) to five-dimensional (spatial position and orientation plus frequency)
2Area of stationary object
If parametric models are used to characterize three-dimensional space, then coverage area is improved, but crosstalk cancellation performance deteriorates
Solution Approach 1:
Instead of using a single parametric model to approximate the entire three-dimensional space, the system pre-calculates and stores specific transfer functions for multiple discrete positions and orientations throughout the space. When the user is at a particular location, the system selects the transfer function specifically corresponding to that local position, ensuring high accuracy for the user's current location rather than relying on a coarse global approximation
3Measurement precision
If crosstalk cancellation is optimized for a specific location, then cancellation accuracy is improved, but the system becomes invalid when the user moves
Solution Approach 1:
The system performs preliminary calculations and measurements to determine transfer functions for multiple pre-defined positions and orientations before actual audio playback. These pre-computed transfer functions are stored in a lookup table or database, allowing the system to quickly retrieve and apply the appropriate cancellation filters when the user moves to different positions during playback, rather than calculating new filters in real-time
Data Source
AI summary
Various embodiments disclose a computer-implemented method comprising determining a first position and a first orientation of a user in an environment, identifying a first point based on the first position and the first orientation of the user in a dimensional map, the dimensional map associating a plurality of transfer functions with a corresponding plurality of points corresponding to positions and orientations in a multi-dimensional space, determining at least one crosstalk cancellation filter based on the plurality of transfer functions, generating a plurality of audio signals for a plurality of loudspeakers based on the at least one crosstalk cancelation filter, and transmitting the plurality of audio signals to the plurality of loudspeakers for output.