Speaker Distortion Correction With Amplifier Output Threshold Switching
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Solution Overview
Problem
Existing speaker systems suffer from nonlinear distortion, which can lead to abnormal noise, clipping, and damage due to excessive amplifier output, particularly at high displacement levels.
Innovation Solution
A speaker distortion correction device that includes an amplifier and a distortion corrector with a nonlinear distortion controller, a maximum value calculating section, and a selector to manage amplifier output within safe thresholds, ensuring appropriate distortion correction without causing speaker abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nonlinear distortion correction is applied to the input signal, then nonlinear distortion of the speaker is suppressed, but the amplifier output may exceed safe limits causing speaker abnormalities
Solution Approach 1:
The maximum value calculating section calculates the maximum output value of the amplifier in advance based on the corrected signal generated by the nonlinear distortion controller. The selector then compares this maximum output value with a predetermined threshold and selects either the corrected signal or the original input signal accordingly, preventing the amplifier output from exceeding safe limits before the distortion correction is applied
Solution Approach 2:
The distortion corrector dynamically switches between two operating modes: when the maximum output value is within the safe threshold, the corrected signal is output to suppress nonlinear distortion; when the maximum output value exceeds the threshold, the original input signal is output to prevent speaker abnormalities. This dynamic selection adapts to different signal conditions in real-time
2Reliability
If the corrected signal is always output to suppress distortion, then speaker distortion is reduced, but speaker abnormalities such as clipping and damage may occur
Solution Approach 1:
The system uses feedback by calculating the maximum output value of the amplifier based on the corrected signal and comparing it with a predetermined threshold. This feedback mechanism allows the selector to determine whether the corrected signal can be safely output or whether the original signal should be used to protect the speaker from damage
Solution Approach 2:
The maximum value calculating section performs beforehand cushioning by calculating the maximum output value in advance and comparing it with the safe threshold before the corrected signal is output to the amplifier. This preventive measure ensures that the speaker is protected from abnormalities before they can occur
Data Source
AI summary
A speaker distortion correction device includes an amplifier configured to drive a speaker; and a distortion corrector. An input signal is input to the distortion corrector, and an output of the distortion corrector is input to the amplifier. The distortion corrector includes a nonlinear distortion controller configured to generate a corrected signal obtained by performing a nonlinear distortion correction process on the input signal so that nonlinear distortion of the speaker is suppressed when the corrected signal is input to the amplifier; a maximum value calculating section configured to calculate a maximum output value of the amplifier to be obtained when the corrected signal is input to the amplifier, based on at least the input signal; and a selector configured to select the corrected signal when the maximum output value does not exceed a predetermined threshold and select the input signal when the maximum output value exceeds the predetermined threshold.