AES E-Library

Electret Receiver for In-Ear Earphone

This paper presents an electret receiver developed for in-ear earphone. The electret diaphragm is fabricated by nano-porous fluoropolymer and charged by the corona method at room temperature. The electret diaphragm is driven to vibrate as a piston motion and sound by the electrostatic force while the audio signal is applied. The influence factors, such as electrostatic charge quantities of electret diaphragm and distance between the electrode plate and diaphragm, are investigated to promote the output sound pressure level of the in-ear earphone. An enclosure with resonator is also design to improve the efficient performance of the in-ear earphone. Consequently, the output sound pressure inside the 2cc coupler can be lifted to exceed 105dB at 1 kHz with the driving voltage of sound signal Vpp=?}3V and remarkably enlarge the output sound pressure level response at low frequency.

Authors: Lin, Shu-Ru; Chiang, Dar-Ming; Lee, I-Chen; Chen, Yan-Ren
Affiliation: Industrial Technology Research Institute
AES Convention:123 (October 2007) Paper Number:7284 Import into BibTeX
Subject:Applications in Audio

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD 123Papers)   /123/7284.pdf

Start a discussion about this paper!