Speaker Signal Processing with Low-Frequency Amplitude Feedback
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Solution Overview
Problem
Audio signals with different frequencies cause intermodulation distortion due to nonlinear parameters in speakers, leading to rough and low-purity sound output.
Innovation Solution
A signal processing method that divides audio signals into high-frequency and low-frequency components, determines an estimated amplitude based on the low-frequency signal, and adjusts the high-frequency signal gain to offset changes in nonlinear parameters, thereby suppressing intermodulation distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio signals with multiple frequencies are input to the speaker, then the speaker can reproduce rich audio content, but intermodulation distortion occurs due to nonlinear parameter changes
Solution Approach 1:
The input audio signal is divided into high-frequency and low-frequency signals through frequency division. This segmentation allows independent processing of each frequency component, enabling the system to apply different gain adjustments to high-frequency and low-frequency signals to suppress intermodulation distortion while maintaining audio reproduction capability
Solution Approach 2:
The system dynamically adjusts the gain of the high-frequency signal based on the amplitude of the low-frequency signal. By changing the gain parameter in real-time according to the low-frequency amplitude, the system compensates for nonlinear parameter changes in the speaker, thereby suppressing intermodulation distortion
2Force
If the low-frequency signal amplitude is large, then the speaker displacement is large providing strong bass output, but the nonlinear parameter changes cause greater distortion in the high-frequency signal
Solution Approach 1:
The system uses the low-frequency signal amplitude as feedback to dynamically adjust the high-frequency signal gain. The gain adjustment module monitors the low-frequency amplitude and automatically modifies the high-frequency gain accordingly, creating a feedback mechanism that compensates for nonlinear effects and maintains high-frequency signal purity even during large speaker displacement
Solution Approach 2:
The system applies preliminary gain adjustment to the high-frequency signal before it is combined with the low-frequency signal. By pre-adjusting the high-frequency gain based on the low-frequency amplitude, the system proactively counteracts the nonlinear parameter changes that would otherwise cause distortion, rather than correcting the distortion after it occurs
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
The method stabilizes the Ampere driving force of high-frequency signals, reducing intermodulation distortion and improving the purity of the audio output.
Implementation Method 1
the low-frequency signal in the audio signal will push the speaker to undergo a large displacement movement, causing the nonlinear parameters of the speaker, such as the electromechanical coefficient BL(x), inductance Le(x) and other parameters to change accordingly
Implementation Method 2
the Ampere driving force of the high-frequency signal changes, causing the high-frequency signal to fluctuate with the same period as the low-frequency signal
Data Source
AI summary
A signal processing method, a signal processing apparatus, a signal processing device and a computer-readable storage medium are provided. The method includes: obtaining an input audio signal input to a speaker, and dividing the input audio signal into a high-frequency signal and a low-frequency signal according to a preset frequency; determining an estimated amplitude generated by the speaker based on the low-frequency signal, and determining a signal gain of the high-frequency signal based on the estimated amplitude, a gain value of the signal gain being positively correlated with the estimated amplitude; and processing, via the signal gain, a signal voltage of the high-frequency signal to obtain a processed high-frequency signal, and superimposing the processed high-frequency signal and the low-frequency signal to obtain an audio signal with suppressed intermodulation distortion.