Audio Signal Processing for Housing Resonance Without Sound Impairment
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Solution Overview
Problem
Conventional signal processing techniques fail to effectively reduce housing resonance caused by rapidly varying frequency components in audio signals, leading to chattering and sound impairment.
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 the input signal, and a resonant band-stop filter to remove the 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
Solution Approach 1:
The invention generates harmonic components from the resonant frequency components that are then added back to the audio signal. This converts the harmful resonance into a beneficial effect where the harmonics compensate for the removed fundamental frequencies, maintaining sound quality while eliminating housing resonance through the band-stop filter.
Solution Approach 2:
The invention changes the frequency domain parameters by generating harmonic components at multiples of the resonant frequency. These harmonic components are then combined with the original signal, effectively transforming the spectral composition to maintain perceptual sound quality after resonance frequency removal.
2Object-affected harmful factors
If the characteristics of the band-stop filter are rapidly corrected to track varying resonant frequencies, then resonance reduction is improved, but chattering and discomfort occur
Solution Approach 1:
The invention performs preliminary action by generating harmonic components from the detected resonant frequencies before the band-stop filter removes them. This preliminary harmonic generation ensures that when the resonant frequencies are removed, the harmonic components are already in place to compensate, preventing the chattering and discomfort that would otherwise 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 using psychoacoustic phenomena to compensate for removed frequency components, ensuring improved sound quality.
Implementation Method 1
a resonant band-pass filter which extracts a frequency component which causes resonance of the housing from an input signal
Implementation Method 2
a harmonic generating unit which generates a harmonic signal for an output signal of the resonant band-pass filter
Implementation Method 3
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
Data Source
AI summary
A signal processing device includes: a resonant band-pass filter which extracts frequency components which cause resonance of a housing from an input signal; a harmonic generating unit which generates a harmonic signal for an output signal of the resonant band-pass filter; an adding unit which adds an output signal of the harmonic generating unit and at least a portion of frequency components of the input signal; and a resonant band-stop filter which removes the frequency components which cause the resonance of the housing from an output signal of the adding unit.