A Study on Audio-Frequency Near-Field Electromagnetic Interference System in Wearable Audio Devices

In the rapidly growing market of wearable wireless audio devices, consumer expectations for comfort, functionality, and sound quality are rising. These demands introduce complex challenges in electromagnetic compatibility (EMC) design, primarily due to increased multifunctionality leading to more sensitive components and interference sources, diversified industrial designs complicating internal layouts, and the necessity for miniaturization which intensifies component interference. This paper presents a focused study on True Wireless Stereo (TWS) earbuds, offering a novel methodology for EMC design to mitigate current noise issues caused by electromagnetic interference, particularly from power inductors. By proposing a new symmetric magnetic field lines guidance method validated through comprehensive analysis and simulations, this study contributes an effective solution for enhancing EMC in wearable audio devices.