Loudspeaker Array Transducer Protection via Signal Compensation
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Solution Overview
Problem
Loudspeaker arrays with multiple transducers face inaccuracies and distortions in tone and spatial response due to transducers operating outside prescribed tolerances, leading to potential damage from intense driving signals.
Innovation Solution
An audio receiver system that monitors transducer performance and adjusts driving signals to maintain tone and spatial response by reducing amplitude, frequency, or altering phase for underperforming transducers, while compensating with neighboring transducers to prevent further deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving signals are intensified to maintain tone and spatial response, then sound quality is improved, but transducer damage risk increases
Solution Approach 1:
The system performs preliminary monitoring of transducer performance parameters (impedance, current, temperature) before damage occurs. By detecting deviations from normal operating ranges in advance, the system can reduce driving signal intensity proactively, preventing transducer damage while maintaining sound quality through compensatory adjustments to other transducers.
Solution Approach 2:
The system continuously monitors transducer performance and uses this feedback to dynamically adjust driving signals. When a transducer shows signs of deterioration or operates outside tolerance ranges, the system reduces its driving signal intensity and compensates by adjusting signals to neighboring transducers, thereby protecting the transducer while maintaining overall sound quality.
2Reliability
If driving signals are reduced to protect underperforming transducers, then transducer safety is improved, but sound quality deteriorates
Solution Approach 1:
The system combines the output of multiple transducers to compensate for reduced signal intensity to protected transducers. By coordinating signals across neighboring transducers and using beamforming techniques, the system maintains the desired tone and spatial response characteristics even when individual transducers operate at reduced power levels.
Solution Approach 2:
The system dynamically changes operating parameters of transducers based on their performance status. For underperforming transducers, the system adjusts parameters such as driving signal amplitude, frequency content, and phase to operate within safe tolerance ranges while compensating through parameter adjustments of other transducers to maintain overall sound quality.
3Power
If all transducers operate at full capacity, then sound output is maximized, but transducer lifespan is reduced
Solution Approach 1:
The system dynamically adjusts the operating capacity of each transducer based on real-time performance monitoring. Rather than operating all transducers at fixed maximum capacity, the system continuously adapts driving signal levels to match actual transducer conditions, allowing transducers to operate at optimal rather than maximum capacity, thereby extending lifespan while maintaining acceptable sound output through coordinated operation of multiple transducers.
Data Source
AI summary
A protection management unit is described that detects one or more poor performing transducers in a loudspeaker array. Upon detection of one or more poor performing transducers, the protection management unit adjusts driving signals for neighboring transducers to compensate for the reduced capabilities of the poor performing transducers. By adjusting driving signals to neighboring transducers, the protection management unit ensures that a desired tone and spatial response for sound emitted by the loudspeaker array is maintained despite one or more poor performing transducers. Other embodiments are also described.