Current Limiting Device for Driving a Loudspeaker
JP2025520339A5Pending Publication Date: 2026-06-03L-ACOUSTICS
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Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- L-ACOUSTICS
- Filing Date
- 2023-06-12
- Publication Date
- 2026-06-03
AI Technical Summary
Technical Problem
Existing audio power amplifiers face issues with maximum output current limits that can damage the output stage, and current limiting methods in PWM amplifiers result in unacceptable audio signal interruptions during normal operation.
Method used
A current limiting device using a state-space model predicts and limits the current drawn by a loudspeaker set, generating a replacement audio sample when the predicted current exceeds a threshold, ensuring the current remains within safe limits without interrupting the audio signal.
Benefits of technology
The device effectively limits the current drawn by loudspeakers to a maximum value, preventing damage while maintaining continuous audio output by anticipating and adjusting the signal before reaching dangerous current levels.
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Abstract
A method for use with an acoustic system (referred to as a plant in control theory) (125) including a loudspeaker set (120), the method comprising obtaining an input audio sample (r n ) and a measured current (m n-d ) drawn by the loudspeaker set, and for a current time step, using a state space model of the loudspeaker set to generate a state vector (x n ) and a model-based estimated current (y n ), generating a predicted current (y n ) for a next time step based on the state vector (x e,n+1 ), generating a replacement audio sample (u n ) based on the state vector (x L,n ) for the current time step, generating a feedback signal (f n-d ) that contributes to the generation of the state vector (x n-d ) for a next time step based on the measured current (m n+1 ) and a time-aligned model-based estimated current (y n ), and generating an output audio sample (u n ) for the current time step, wherein when the predicted current (y e,n+1 ) is higher in amplitude than a threshold (I max ), the output audio sample (u n ) is either the input audio sample (r n ) or the replacement audio sample (u L,n ) for the current time step.
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