Abstract
Stimulated by market demand and technological progress, the audio industry is booming. Many high-fidelity earphones are no longer satisfactory with simply providing customers with products but tend to provide customers with more opportunities to adjust their own tuning, one of which is to add the earphones with different acoustic silencer foam. This study begins by introducing the different types of earphones and their development history. After that, the specific research content is raised by questioning the prevailing perception of acoustic silencer foam in earphones. By comparing and analyzing the differences reflected by the frequency response curves of headphones equipped with different types of acoustic silencer foam, it is concluded that the smaller the cells of acoustic silencer foam and the presence of membrane will increase its ability to reduce the loudness at high frequency. This study reveals two significant characteristics which affect the performance of acoustic silencer foam and provides a reliable theoretical basis for the tuning technology of foam.
Highlights
A headset is a conversion device that receives electric signals from a media player and converts signals into sound waves through a speaker close to the ear
The traditional dynamic driver cannot put the entire unit in the ear [2], while the balanced armature can be readily put into the ear canal due to the tiny driver
With Room EQ Wizard software, the frequency response curves of Sony IER-M7 earphones equipped with different kinds of silencer foam were measured
Summary
A headset is a conversion device that receives electric signals from a media player and converts signals into sound waves through a speaker close to the ear. In terms of the sound process, the dynamic driver and balanced armature driver are alike. Both rely on the vibration of the diaphragm in a permanent magnetic field to produce sound [1]. Inside the balanced armature driver, the electronic signal vibrates a miniature reed balanced between two magnets. This reed drives the diaphragm to produce sound due to magnetic force. The traditional dynamic driver cannot put the entire unit in the ear [2], while the balanced armature can be readily put into the ear canal due to the tiny driver. Because of its higher sensitivity, the balanced armature has a better transient response and details
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