Multi-order Ambisonics Encoding with Order-Specific Weighting
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Solution Overview
Problem
Ambisonics decoders are typically optimized for a single order, which limits their ability to produce high-quality soundfield reproduction when dealing with multi-order Ambisonics mixes commonly used in games and other applications.
Innovation Solution
An apparatus and method that involve receiving mono audio sources with direction and target Ambisonics order, weighting each soundfield before mixing, and then mixing the soundfields to produce a high-quality Ambisonics reproduction for playback on multiple speakers or as binaural signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Ambisonics decoders are optimized for a single order, then soundfield reproduction quality for that specific order is maximized, but the ability to reproduce multi-order Ambisonics mixes is limited
Solution Approach 1:
The patent divides the multi-order Ambisonics signal into separate order components (0th order, 1st order, 2nd order, etc.), processes each order independently through dedicated decoding paths optimized for that specific order, and then combines the results. This segmentation allows each decoder to be optimized for its specific order while maintaining overall multi-order compatibility.
Solution Approach 2:
The patent implements dynamic order selection and weighting where the system can adaptively determine which Ambisonics orders are present in the input signal and adjust the decoding process accordingly. This allows the decoder to optimize performance for the specific multi-order mix being processed rather than being fixed for a single order.
2Adaptability or versatility
If multiple Ambisonics orders are mixed into a single high-order mix, then the system can handle diverse audio sources, but soundfield reproduction quality deteriorates due to order-truncation artifacts
Solution Approach 1:
The patent applies preliminary processing to separate and identify different Ambisonics orders in the mixed signal before decoding. By performing order separation and individual optimization in advance, the system prevents order-truncation artifacts from degrading the final soundfield reproduction quality while maintaining the benefits of multi-order mixing.
3Device complexity
If a single decoder is used for all Ambisonics orders, then device complexity is reduced, but reproduction fidelity across multiple orders is compromised
Solution Approach 1:
The patent designs a universal decoding framework that can handle multiple Ambisonics orders through a standardized processing architecture. While multiple order-specific processing paths are implemented, they follow a unified structure that maintains manageable complexity while achieving high reproduction fidelity for each order type.
Data Source
AI summary
A technique for encoding Ambisonics audio includes inputting audio to multiple Ambisonics encoders producing respective Ambisonics soundfields. Prior to mixing the soundfields, each soundfield is weighted to mitigate artifacts from order-truncation. After weighting, the soundfields are mixed to produce Ambisonics audio.