Speaker Displacement Protection via Real-Time Transfer Function Gain Control
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Solution Overview
Problem
The accuracy of speaker displacement protection is low, and there is a significant loss in sound loudness due to the formation of a displacement protection model with a single speaker, leading to potential damage from excessive diaphragm displacement.
Innovation Solution
A method that creates a target transfer function based on the real-time amplitude of the speaker and fusion voltage, determines target gains according to this function and a predetermined displacement threshold, and performs gain processing on the original audio signal to provide displacement protection, thereby improving accuracy and reducing audio distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a displacement protection model with a single speaker is used, then the speaker is protected from excessive displacement, but over-compression occurs resulting in significant loss of sound loudness
Solution Approach 1:
The protection model dynamically adjusts compression based on real-time amplitude feedback from the speaker. The system continuously monitors speaker displacement and adapts the compression level accordingly, applying stronger compression only when displacement approaches thresholds, thereby protecting the speaker while minimizing unnecessary loudness loss during normal operation.
Solution Approach 2:
The system implements a feedback mechanism where the real-time amplitude of the speaker is monitored and fed back to adjust the compression level. This closed-loop control allows the system to respond to actual speaker conditions rather than applying fixed compression, preventing over-compression and preserving sound quality while still providing protection.
2Loss of energy
If no displacement protection is provided, then sound loudness is maintained, but the speaker may be damaged due to excessive diaphragm displacement under large signals
Solution Approach 1:
The system applies preliminary compression before the speaker reaches dangerous displacement levels. By anticipating potential damage based on the transfer function model and real-time amplitude monitoring, the system proactively reduces gain to prevent excessive displacement, thereby protecting the speaker while maintaining acceptable sound output.
Solution Approach 2:
The protection mechanism is activated in advance based on predicted displacement from the transfer function model. Rather than waiting for damage to occur, the system preemptively adjusts compression levels when indicators suggest approaching dangerous thresholds, ensuring speaker protection before actual damage can happen.
3Reliability
If traditional displacement protection is applied, then speaker damage is prevented, but accuracy of displacement protection is low causing abnormal sound and audio distortion
Solution Approach 1:
The system uses a transfer function model that relates input voltage to speaker displacement through calibrated parameters including electromechanical coupling coefficients and mechanical resonance characteristics. By accurately modeling these parameters, the system achieves precise displacement estimation and protection with minimal audio distortion.
Solution Approach 2:
The patent replaces direct mechanical displacement sensing with an electrical measurement approach using the transfer function model. Instead of physically measuring diaphragm position, the system calculates displacement from electrical signals through the modeled relationship between voltage and mechanical response, achieving accurate protection without mechanical sensors that could introduce distortion.
Data Source
AI summary
A speaker displacement protection method, a speaker displacement protection device, and a computer-readable storage medium are provided. The speaker displacement protection method includes creating a target transfer function based on a real-time amplitude of the speaker and a fusion voltage relative to the combination device, determining target gains according to the target transfer function and a predetermined displacement threshold, and performing gain processing on an original audio signal input to the combination device based on the target gains, so as to provide displacement protection for the speaker. As such, accuracy of the speaker displacement protection is improved while audio distortion is reduced.