Spatial Audio Decoder Using Segmentation for Directional Accuracy
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Solution Overview
Problem
Active and passive spatial audio signal decoders lack universality, often blurring directional audio sources or imparting directionality to nondirectional signals, failing to preserve spatial characteristics during decoding.
Innovation Solution
An audio signal decoder that determines the number and direction of arrival of directional audio sources and decomposes input signals into active and passive components, allowing for accurate decoding into respective output formats that preserve spatial characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive signal decoding is used, then decoding operations are simple and based only on input/output formats, but directional audio sources are blurred and spatial characteristics are not preserved
Solution Approach 1:
The patent segments the input spatial audio signal into multiple components: directional audio sources, diffuse audio sources, and ambient sound. Each component is processed separately through dedicated decoding paths, allowing directional sources to be preserved with accurate spatial characteristics while diffuse and ambient components are handled appropriately, thus resolving the contradiction between simple decoding operations and directional accuracy preservation
Solution Approach 2:
The patent implements dynamic decoding where the decoding operations adapt based on the detected spatial characteristics of the input signal. The system dynamically identifies directional sources and adjusts decoding parameters to preserve their spatial characteristics, making the decoding process both simple (when no directional sources are present) and accurate (when directional sources are detected), thereby resolving the contradiction
2Measurement precision
If active signal decoding is used, then spatial characteristics are adapted to input signal characteristics, but diffuse sources are focused incorrectly and nondirectional signals are imparted with directionality
Solution Approach 1:
The patent segments the audio signal into directional and diffuse components, applying different decoding strategies to each. Directional sources undergo active decoding to preserve their spatial characteristics, while diffuse sources and ambient sound are processed through separate paths that prevent incorrect focusing, thus maintaining both spatial characteristics preservation and fidelity
Solution Approach 2:
The patent applies different decoding qualities to different parts of the audio signal. Directional sources receive precise active decoding with full spatial characteristic adaptation, while diffuse and ambient components receive processing that maintains their nondirectional nature. This local differentiation ensures that each component is decoded with appropriate quality, resolving the contradiction between spatial characteristics preservation and fidelity
3Adaptability or versatility
If universal decoder is designed to handle all spatial audio formats, then adaptability increases, but decoding accuracy for specific spatial characteristics decreases
Solution Approach 1:
The patent creates a universal decoder architecture that can handle multiple spatial audio formats and signal types. The system incorporates multiple decoding paths (passive, active, and hybrid) that can be selected based on the input signal characteristics, making the decoder adaptable to various formats while maintaining accuracy through intelligent path selection
Solution Approach 2:
The patent implements dynamic format detection and decoding path selection. The system automatically detects the input spatial audio format and spatial characteristics, then dynamically adjusts the decoding strategy to match the specific requirements of that format, ensuring both universal compatibility and decoding accuracy for each specific case
Data Source
AI summary
A method to decode audio signals is provided that includes: receiving an input spatial audio signal; determining directions of arrival of directional audio sources represented in the received input spatial audio signal; determining one of an active input spatial audio signal component and a passive spatial audio signal input component, based upon the determined directions of arrival; determining the other of the active input spatial audio signal component and the passive input spatial audio signal component based upon the determined one of the active input spatial audio signal component and the passive input spatial audio signal component; decoding the active input spatial audio signal component to a first output format; and decoding the passive input spatial audio signal component to a second output format.