Speaker Distortion Band Compression for High-Power Audio
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Solution Overview
Problem
Acoustic products such as speakers and headphones experience significant nonlinear distortion when playing high-power sound, leading to impaired sound quality and potential damage to the speaker.
Innovation Solution
A method and apparatus that detect signal distortion frequency bands in sound signals by comparing transmitted and received signal spectra, performing compression processing on the target sound signal within these bands to eliminate distortion dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power sound is played through the loudspeaker, then the sound output power is improved, but nonlinear distortion increases and speaker damage risk increases
Solution Approach 1:
The patent uses a microphone to capture the actual sound output from the loudspeaker and feeds it back to a processor. The processor compares the original signal with the captured signal to detect distortion frequency bands, then dynamically adjusts the output signal to eliminate distortion. This closed-loop feedback system enables real-time distortion compensation while maintaining high power output.
Solution Approach 2:
The patent dynamically changes the gain parameter of the output signal in real-time based on detected distortion levels. When distortion is detected in specific frequency bands, the system adjusts the gain of those frequency bands to reduce distortion. This parameter adjustment occurs continuously during high-power operation, allowing the system to maintain optimal performance without distortion-related damage.
2Power
If high power sound is played through the loudspeaker, then the sound output power is improved, but speaker damage risk increases
Solution Approach 1:
The feedback mechanism continuously monitors the actual sound output and detects distortion that indicates speaker stress or damage risk. When distortion is detected, the system immediately adjusts the output signal to reduce the burden on the speaker, preventing further damage. This real-time monitoring and adjustment protect the speaker during high-power operation.
Solution Approach 2:
The system proactively detects early signs of speaker stress through distortion detection and takes preventive action by adjusting the output signal before damage occurs. The feedback loop continuously monitors for abnormal conditions and reduces power output in response, cushioning against potential speaker failure before it happens.
3Object-generated harmful factors
If dynamic compression processing is performed on the sound signal, then sound quality is improved, but processing complexity increases
Solution Approach 1:
The patent divides the frequency spectrum into multiple frequency bands and processes each band independently. The processor identifies distortion in specific frequency bands and applies compression only to those affected bands rather than the entire signal. This segmented approach reduces unnecessary processing complexity while effectively eliminating distortion where it occurs.
Solution Approach 2:
The system applies different processing characteristics to different frequency bands based on their specific distortion levels. Frequency bands with distortion receive compression processing, while clean frequency bands pass through unchanged. This localized processing approach improves sound quality where needed without adding unnecessary complexity to the overall processing system.
Data Source
AI summary
The present disclosure provides a method, an apparatus and a device for processing a sound signal, wherein the method comprises: acquiring a transmitted signal spectrum of a target sound signal sent out by a loudspeaker and a received signal spectrum of the target sound signal received by a microphone; detecting whether there is a signal distortion frequency band with signal distortion in the target sound signal according to the transmitted signal spectrum and the received signal spectrum, and when detecting that the signal distortion frequency band exists, performing compression processing on the target sound signal according to the signal distortion frequency band during a current signal processing cycle, and transmitting a compressed target sound signal through the loudspeaker.