Wireless earbuds have become the preferred electronic device for listening to music and for hands-free talking. The combined radio performance of the earbud and the handset determines the quality of the established communication link and hence the quality of the user experience. This paper presents an extensive comparative study of five common Bluetooth earbuds, where the transmit performance, in terms of total radiated power (TRP), is investigated. The measurements are conducted for the right-side earbud and for the low and high ends of the Bluetooth frequency spectrum. Moreover, two scenarios are considered: (1) the earbud is placed in free space and (2) the earbud is placed in a person’s ear. For the latter case, a total of 12 volunteers are involved in the measurement campaign. Measurements show that the mean performance deterioration, due to the placement of the earbud in the person’s ear, ranges from 3 to 6 dB across the tested earbuds.

中文翻译：

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无线评估流行的入耳式蓝牙耳塞的用户身体流失

无线耳塞已成为收听音乐和免提通话的首选电子设备。耳塞和手机的综合无线电性能决定了已建立的通信链路的质量，从而决定了用户体验的质量。本文对五个常见的蓝牙耳塞进行了广泛的比较研究，研究了以总辐射功率（TRP）表示的传输性能。测量是针对右侧耳塞以及蓝牙频谱的低端和高端进行的。此外，考虑了两种情况：（1）耳塞放置在自由空间中；（2）耳塞放置在人的耳朵中。对于后一种情况，共有12名志愿者参与了评估活动。测量表明，平均性能下降了，