Loudspeaker Control via Voltage Current Non-Linearity Analysis
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Solution Overview
Problem
Existing loudspeaker control methods require knowledge of mechanical parameters and displacement limits, which can vary due to production variations and aging, leading to potential damage from exceeding displacement limits.
Innovation Solution
A method that measures voltage and current signals to perform non-linearity analysis, deriving a control scheme for loudspeaker protection and acoustic signal processing without needing manufacturer-supplied data or direct mechanical characteristic measurements, using a normalized loudspeaker model and displacement limit based on arbitrary scaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional loudspeaker control methods using manufacturer-supplied mechanical parameters are used, then displacement limits can be controlled, but the system becomes unreliable due to parameter variations from production and aging
Solution Approach 1:
The loudspeaker system performs self-diagnosis by measuring its own voltage and current signals to detect non-linearities and estimate displacement limits, eliminating the need for external mechanical parameter measurements or manufacturer-supplied data. The system serves itself by using its operational electrical signals to monitor and protect its mechanical state.
Solution Approach 2:
The patent replaces mechanical measurement systems (displacement sensors, force factor measurements, mass measurements) with electrical signal analysis. By analyzing voltage and current non-linearities, the system infers mechanical displacement limits without direct mechanical sensing, substituting electrical domain analysis for mechanical domain measurement.
2Manufacturing precision
If non-linear loudspeaker models are used for pre-compensation, then acoustic output linearity is improved, but computational demand increases significantly
Solution Approach 1:
Instead of implementing full non-linear pre-compensation models, the system performs partial action by detecting non-linearities through voltage-current analysis and applying corrective control only when and where needed. The system monitors the degree of non-linearity and applies compensation selectively, avoiding the computational overhead of complete non-linear modeling while maintaining sufficient acoustic linearity.
3Reliability
If displacement limits are strictly enforced to prevent mechanical damage, then loudspeaker protection is improved, but audible signal distortion increases
Solution Approach 1:
The system dynamically adjusts the displacement limit control based on real-time non-linearity detection. Rather than applying fixed, conservative limits that cause distortion, the system continuously monitors voltage-current relationships and adapts the control signal to allow maximum safe excursion. This dynamic approach maintains protection while minimizing audible distortion by permitting operation closer to true mechanical limits.
Data Source
AI summary
A control signal is generated for mechanical loudspeaker protection, or for other signal pre-processing functions. The procedure contains the following steps:perform a non-linearity analysis based on current and voltage measurements;use the results of the non-linearity analysis, and the voltage and current measurements to control audio processing for the loudspeaker thereby to implement loudspeaker protection and/or acoustic signal processing.