Resonant Audio Filtering with Harmonic Compensation for Housing Resonance
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Solution Overview
Problem
Conventional techniques for reducing housing resonance in signal processing devices are ineffective when frequency components causing resonance rapidly vary, leading to lagged detection and correction, resulting in chattering or discomfort in sound.
Innovation Solution
A signal processing device comprising a resonant band-pass filter to extract frequency components causing resonance, a harmonic generating unit to generate harmonic signals, an adding unit to combine these signals with input signal components, and a resonant band-stop filter to remove resonant frequencies, thereby reducing housing resonance and sound impairment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a band-stop filter is used to remove frequency components causing housing resonance, then housing resonance is reduced, but sound quality is impaired when frequency components rapidly vary
Solution Approach 1:
A harmonic signal is generated as an intermediary to compensate for the removed fundamental frequency components. The harmonic generating unit creates harmonic signals based on the detected resonant frequency components, and these harmonic signals are added back to the audio signal after band-stop filtering, thereby maintaining sound quality while eliminating housing resonance.
Solution Approach 2:
The system dynamically changes the parameters of the band-stop filter based on the detected resonant frequency components. When resonant frequency components are detected, the band-stop filter parameters are adjusted to target those specific frequencies, allowing adaptive removal of resonance-causing frequencies while preserving other audio components.
2Object-affected harmful factors
If the level of attenuation by the band-stop filter is increased to reduce housing resonance, then resonance is reduced, but sound quality is impaired
Solution Approach 1:
The attenuation is applied locally only to the specific frequency components that cause housing resonance, rather than uniformly across the entire audio spectrum. The band-stop filter is configured to target only the detected resonant frequencies, allowing high attenuation at problematic frequencies while maintaining original signal quality at other frequencies.
3Object-affected harmful factors
If correction of band-stop filter characteristics is performed rapidly to track varying frequency components, then housing resonance is reduced, but chattering and discomfort in sound occur
Solution Approach 1:
Harmonic signals are generated in advance based on the detected resonant frequency components, before the band-stop filter removes the fundamental frequencies. This preliminary generation of harmonic content cushions against the potential sound quality degradation and chattering that would occur from rapid filter characteristic changes.
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 solution effectively reduces housing resonance and minimizes sound impairment by dynamically adjusting filter characteristics to compensate for rapidly varying frequency components, ensuring improved sound quality.
Implementation Method 1
a resonant band-pass filter that extracts a frequency component which causes resonance of the housing from an input signal
Implementation Method 2
a harmonic generating unit that generates a harmonic signal for an output signal of the resonant band-pass filter
Implementation Method 3
a resonant band-stop filter that removes the frequency component which causes the resonance of the housing from an output signal of the adding unit
Data Source
AI summary
A signal processing device includes: a resonant band-pass filter which extracts a frequency component which causes resonance of a housing from an input signal; a harmonic generating unit configured to generate a harmonic signal for an output signal of the resonant band-pass filter; an adding unit configured to add an output signal of the harmonic generating unit and at least a portion of a frequency component of the input signal; and a resonant band-stop filter which removes the frequency component which causes the resonance of the housing from an output signal of the adding unit.