Earphone Sound Reproduction Correction Filter for Resonance Suppression
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Solution Overview
Problem
When using earphones, unnecessary resonance characteristics of the external auditory canal are acquired, leading to a loss of the original necessary resonance, resulting in compromised sound quality, which existing sound reproduction systems fail to adequately address.
Innovation Solution
A sound reproduction apparatus that generates a correction filter to convolve with the sound reproduction signal, adjusting the acoustic characteristics to match those of non-earphone usage, thereby suppressing unwanted resonance and enhancing sound quality by outputting the corrected signal to a loudspeaker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If earphones are used for sound reproduction, then sound can be delivered directly to the listener's ear, but unnecessary resonance characteristics of the external auditory canal are acquired and original necessary resonance characteristics are lost
Solution Approach 1:
The patent applies parameter changes by modifying the acoustic characteristics of the earphone system through equalization filters. The system measures the actual resonance characteristics of the listener's external auditory canal and adjusts frequency response parameters to suppress unnecessary resonances while enhancing necessary ones, thereby transforming the harmful resonance profile into a beneficial one.
Solution Approach 2:
The patent implements feedback by using a microphone to capture the actual sound output in the listener's ear canal and comparing it with the desired sound profile. This feedback loop enables real-time measurement and correction of resonance characteristics, allowing the system to adaptively adjust the sound reproduction to match the listener's specific anatomical features.
2Adaptability or versatility
If different earphones are used by the listener, then various earphone types can be utilized, but the sound quality varies due to different resonance characteristics
Solution Approach 1:
The patent applies dynamics by making the sound reproduction system adaptive rather than static. The system dynamically adjusts its equalization parameters based on real-time measurements of the listener's ear canal characteristics and the specific earphone being used. This dynamic adaptation allows the system to maintain consistent sound quality across different earphone types by continuously optimizing the frequency response for each configuration.
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 apparatus effectively improves sound quality by aligning it with natural sound reproduction characteristics, regardless of the earphone type used, by generating a correction filter that adjusts acoustic resonance, ensuring consistent quality across different earphones.
Implementation Method 1
unnecessary resonance characteristic of external auditory canal is acquired by echo from the earphone (reflector), and original necessary resonance characteristic of external auditory canal is lost
Data Source
AI summary
According to one embodiment, a loudspeaker is provided in a case of an earphone. The case closes an external auditory canal extended from a tympanum of a listener. The earphone has an opening toward the external auditory canal. In an apparatus for generating a sound reproduction to the loudspeaker, a storage unit stores a correction filter in which a maximum of a gain at a frequency band lower than or equal to 10 kHz is larger than a maximum of a gain at a frequency band higher than 10 kHz. An acquisition unit acquires a first sound reproduction signal. A correction unit generates a second sound reproduction signal by convoluting the correction filter with the first sound reproduction signal. An output unit outputs the second sound reproduction signal to the loudspeaker.