HOA Sound Source Rendering with Dynamic Coordinate Standards
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Solution Overview
Problem
In multi-point higher order ambisonic (MP-HOA) environments, the distortion of sound fields due to computational delay occurs when listeners move suddenly or change their head direction, as existing methods struggle to effectively adjust head-related transfer function (HRTF) rendering angles in real-time.
Innovation Solution
A method is introduced that identifies a playback area for HOA sound sources and determines a coordinate calculation standard based on the positional relationship between the playback area and the listener, calculating and applying the HRTF rendering angle accordingly to ensure stable sound field playback regardless of listener movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HRTF rendering angle is continuously corrected based on global coordinate system in MP-HOA environment, then sound field accuracy is improved, but computational delay increases causing distortion when listener moves suddenly
Solution Approach 1:
The system dynamically switches between two coordinate calculation standards (global coordinate system and listener-based coordinate system) depending on the listener's position relative to the playback area. When the listener is within the playback area, the listener-based coordinate system is used to reduce computational delay. When outside, the global coordinate system is used to maintain sound field accuracy. This dynamic adaptation resolves the contradiction between accuracy and delay.
Solution Approach 2:
The invention changes the parameter of coordinate calculation standard based on the listener's positional relationship with the playback area. By identifying whether the listener is inside or outside the playback area and switching the calculation standard accordingly, the system optimizes both sound field accuracy and computational efficiency, eliminating distortion caused by fixed coordinate system usage.
2Adaptability or versatility
If multiple HOA signals are played in MP-HOA environment to provide greater immersion, then listener immersion is improved, but distortion occurs due to computational delay when listener moves
Solution Approach 1:
The system dynamically adjusts the coordinate calculation standard based on the listener's position relative to the playback area of each HOA sound source. This dynamic approach allows multiple HOA signals to be played simultaneously with proper spatial positioning, maintaining both immersion and sound field stability without the distortion that would result from a fixed coordinate system.
Data Source
AI summary
A method of playing a sound source is provided. The method includes identifying a playback area for at least one higher order ambisonic (HOA) sound source existing in a target space, determining a coordinate calculation standard for playing the HOA sound source based on a positional relationship between the playback area of the HOA sound source and a listener existing in the target space, and calculating a head related transfer function (HRTF) rendering angle of the HOA sound source according to the determined coordinate calculation standard and playing the HOA sound source.