Speaker Displacement Prediction for Excessive Amplitude Control
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Solution Overview
Problem
Existing sound processing technologies fail to effectively suppress excessive amplitude in speakers, leading to inter modulation distortion and a loss of high-frequency signals, which reduces sound quality and can cause physical damage to the speaker.
Innovation Solution
A sound processing device that calculates a prediction value of speaker displacement using an equivalent model and performs amplitude control on the input signal when the prediction value exceeds a threshold, incorporating parameters like mechanical system compliance and direct current resistance, and includes temperature control to prevent voice coil overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the speaker operates at high amplitude to improve sound output, then the sound quality deteriorates due to inter modulation distortion and high frequency loss
Solution Approach 1:
The system performs preliminary action by calculating the prediction value of speaker displacement before the actual displacement occurs. The prediction value calculation unit computes the expected displacement based on the input signal and speaker equivalent model, allowing the system to take preventive amplitude control action before inter modulation distortion actually occurs, thereby maintaining sound quality while allowing high power operation
Solution Approach 2:
The system implements feedback by continuously monitoring the prediction value of speaker displacement and comparing it against threshold values. The amplitude control unit adjusts the input signal amplitude based on this feedback loop, reducing amplitude when the prediction value exceeds the first threshold to prevent distortion, thus maintaining reliable sound quality during high power operation
2Power
If the speaker operates at high amplitude to improve sound output, then physical damage to the speaker occurs
Solution Approach 1:
The system takes preliminary protective action by calculating the prediction value of speaker displacement before excessive amplitude occurs. When the prediction value exceeds the first threshold, the amplitude control unit proactively reduces the input signal amplitude, preventing the speaker from reaching displacement levels that would cause physical damage while still allowing high power operation within safe limits
Solution Approach 2:
The system provides beforehand cushioning by establishing a protective mechanism that activates before damage occurs. The prediction value calculation and threshold comparison create a cushioning effect that gradually reduces amplitude when approaching dangerous levels, rather than allowing sudden excessive displacement that would cause immediate physical damage to the speaker
3Reliability
If amplitude control is performed to suppress excessive amplitude, then sound quality improves, but high frequency signals are lost
Solution Approach 1:
The system applies dynamics by using different threshold values for different operating conditions. The first threshold (higher value) is used for normal operation to allow high frequency signals, while the second threshold (lower value) is used when excessive amplitude is detected to prevent distortion. This dynamic threshold adjustment maintains sound quality by suppressing excessive amplitude only when necessary, preserving high frequency signals during normal operation
Solution Approach 2:
The system changes parameters by switching between different threshold values based on operating conditions. When the prediction value exceeds the first threshold, the system transitions to using the second threshold for amplitude control, thereby adapting the control parameters to maintain sound quality while minimizing loss of high frequency information
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach accurately suppresses excessive amplitude, reduces inter modulation distortion, and enhances sound quality while preventing physical damage to the speaker, ensuring higher fidelity and reliability in sound reproduction systems.
Implementation Method 1
calculates a prediction value of a displacement of a speaker according to an input signal supplied to the speaker on the basis of an equivalent model of the speaker
Implementation Method 2
an amplitude control unit that performs amplitude control on the input signal in a case in which the prediction value is greater than a predetermined threshold value
Implementation Method 3
a temperature control unit that performs temperature control for suppressing a temperature increase of the voice coil with respect to the input signal according to the temperature of the voice coil
Data Source
AI summary
The present technology relates to a sound processing device, a method, and a program capable of suppressing an excessive amplitude and obtaining higher quality of sound. A sound processing device includes: a prediction value calculation unit that calculates a prediction value of a displacement of a speaker according to an input signal supplied to the speaker on the basis of an equivalent model of the speaker; and an amplitude control unit that performs amplitude control on the input signal in a case in which the prediction value is greater than a predetermined threshold value. The present technology can be applied to a sound reproduction system.