Spatial Audio Rendering with Metadata Interpolation
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Solution Overview
Problem
Conventional spatial audio capture techniques, such as linear and parametric methods, struggle to provide accurate 6-degree-of-freedom (6DoF) rendering, especially when the listener moves significantly from the microphone array position, due to unreliable distance estimation and noise in complex audio scenes, leading to spatial errors and artefacts.
Innovation Solution
The method involves obtaining and processing multiple audio signal sets from microphone arrays at different positions, interpolating spatial metadata to predict audio signals at the listener's position, and generating a spatial audio output based on these predictions, eliminating the need for distance estimation and improving robustness in complex audio environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If linear spatial audio capture is used with a high-end microphone array, then spatial audio rendering quality is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses parametric spatial audio capture to create a simplified copy of the spatial audio experience. Instead of requiring complex high-end microphone arrays, the system captures audio with simpler microphones and uses parametric processing to synthesize spatial characteristics, effectively copying the benefits of complex arrays without the complexity
Solution Approach 2:
The patent transforms the approach by changing from direct linear spatial capture to parametric representation. It extracts perceptually relevant parameters (such as direction, distance, and spatial characteristics) from the audio signals and uses these parameters to synthesize spatial audio, thereby achieving high-quality rendering with simpler hardware
2Manufacturing precision
If parametric spatial audio capture is used with compact microphone arrangements, then spatial audio perception is improved, but accuracy deteriorates in complex audio scenes
Solution Approach 1:
The patent segments the audio signal into multiple frequency bands and processes each band separately to extract spatial parameters. This segmentation allows the system to handle complex audio scenes more effectively by analyzing different frequency components independently and combining their spatial characteristics
Solution Approach 2:
The system employs feedback mechanisms to continuously refine spatial parameter estimation. By monitoring the extracted parameters and adjusting the processing accordingly, the system maintains reliability in complex audio scenes where initial estimates may be inaccurate
3Manufacturing precision
If linear spatial audio capture is used, then spatial separation is improved, but microphone spacing requirements create practical limitations
Solution Approach 1:
The patent copies the spatial separation effect achieved by physically spaced microphones through parametric synthesis. Instead of requiring physically separated microphones, the system uses parametric processing to simulate the spatial separation that would result from such arrangements, making implementation much easier
4Manufacturing precision
If distance estimation is used in parametric spatial audio capture, then spatial positioning is improved, but errors increase when listener moves from microphone position
Solution Approach 1:
The patent transitions from position-based spatial audio (tied to microphone location) to parameter-based spatial audio. By representing spatial characteristics in terms of perceptual parameters rather than physical positions, the system enables accurate spatial rendering at any listening position without being constrained by the original microphone placement
Data Source
AI summary
An apparatus comprising means configured to: obtain two or more audio signal sets, wherein each audio signal set is associated with a position; obtain at least one parameter value for at least two of the audio signal sets; obtain the positions associated with at least the at least two of the audio signal sets; obtain a listener position; generate at least one audio signal based on at least one audio signal from at least one of the two or more audio signal sets based on the positions associated with the at least the at least two of the audio signal sets and the listener position; generate at least one modified parameter value based on the obtained at least one parameter value for the at least two of the audio signal sets, the positions associated with the at least two of the audio signal sets and the listener position; and process the at least one audio signal based on the at least one modified parameter value to generate a spatial audio output.