Adaptive Sound Reproduction System Using Dynamic Filter Parameters
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Solution Overview
Problem
Existing 3D audio reproduction systems using loudspeaker arrays are limited by their non-adaptive nature, requiring pre-calculated filter databases and high computational loads, which restrict their operational range and flexibility, especially when listeners move within the sound field.
Innovation Solution
A sound reproduction system that employs a signal processor to dynamically adjust operational control parameters of a filter set in real-time based on the instantaneous listener position, allowing for adaptive and efficient processing without the need for pre-generated filters for each listener position, using a combination of loudspeaker-independent and dependent filters to generate targeted acoustic beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pre-calculated filter databases are used for adaptive binaural audio reproduction, then the system can adapt to different listener positions, but the operational range is limited and computational load is high
Solution Approach 1:
The system dynamically updates operational control parameters of the filter set in real-time based on the instantaneous listener position tracked by a position tracker, rather than relying on pre-calculated filter databases. This allows continuous adaptation to listener movement while reducing computational complexity through efficient parameter updates.
Solution Approach 2:
The signal processor determines updated operational control parameters of the filter set based on the instantaneous position of the listener and adaptively tails the parameters accordingly. This parameter-based approach enables flexible adaptation without requiring complete filter recalculations, reducing computational load while maintaining adaptability.
2Adaptability or versatility
If pre-calculated filter databases are used for different listener positions, then adaptive reproduction is achieved, but the system requires high computational resources and has limited operational range
Solution Approach 1:
The system uses a filter set that is configured in advance with the capability to process binaural audio material, but the operational control parameters are updated in real-time based on listener position. This preliminary configuration combined with dynamic parameter adjustment extends the operational range while maintaining processing efficiency.
Solution Approach 2:
Instead of storing and switching between multiple pre-calculated filter databases for different positions, the system uses a single filter set whose operational parameters are copied/updated based on real-time position data. This approach extends operational range without the computational burden of managing multiple filter databases.
3Speed
If listener position tracking is implemented in real-time, then responsive adaptation to listener movements is achieved, but processing load increases
Solution Approach 1:
The system extracts only the essential operational control parameters from the filter set that need to be updated based on listener position, rather than recalculating entire filter databases. This extraction approach enables real-time responsiveness while keeping processing load manageable.
Solution Approach 2:
The signal processor continuously updates operational control parameters in real-time based on instantaneous listener position data from the position tracker. This dynamic parameter adjustment achieves responsive adaptation to listener movements without the computational overhead of complete filter recalculations.
Data Source
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AI summary
A sound reproduction system and filter set comprising an array of loudspeakers, comprises a plurality of delay-gain filter elements, and further wherein the filter set comprises a plurality of loudspeaker-specific filter elements (12) which are each associated with different respective speakers of the loudspeaker array, and further comprising a plurality of loudspeaker-independent filter elements (10) which are each common to a plurality of the loudspeakers of the array.