Analysis of harmonic distortion due to uneven magnetic field in a microspeaker used for mobile phones

Author

Hwang, Gun-Yong ; Kim, Han-gyoo ; Hwang, Sang-Moon ; Kang, Beom-Soo

Author_Institution

Sch. of Inf. & Commun. Eng., Youngsan Univ., Kyongnam, South Korea

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2376

Lastpage

2378

Abstract

With the advent of 2.5-G mobile phone, Internet service is to be realized for multimedia data communication. For an acoustic part, a smaller and lighter microspeaker is also soon to be realized as an MP3 song player and a speakerphone. Harmonic distortion due to uneven magnetic field in the microspeaker is becoming more important in mobile phones in order to generate high-quality sound. In this paper, analysis of sound pressure level and harmonic distortion is presented by considering mechanical and magnetic coupling effects. Experimental verification is also followed for inner and outer permanent magnet (PM)-type microspeakers. Results show that the outer PM-type microspeaker shows better sound pressure characteristics with reduced harmonic distortion.

Keywords

harmonic distortion; loudspeakers; magnetic fields; mobile radio; telephone sets; 2.5G mobile phone; Internet service; MP3 song player; acoustic component; harmonic distortion; magnetic coupling; magnetic field; mechanical coupling; microspeaker; multimedia data communication; permanent magnet; sound pressure level; speakerphone; Couplings; Data communication; Digital audio players; Harmonic analysis; Harmonic distortion; Magnetic analysis; Magnetic fields; Mobile handsets; Multimedia communication; Web and internet services;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.803579

Filename

1042193