Thd design and distortion study of flat panel loudspeaker

• Main Authors: Ching-Po Chao, 趙慶博
• Other Authors: Tai-Yan Kam
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/46295223652903625064

碩士 === 國立交通大學 === 機械工程系所 === 95 === An innovative design of flat panel loudspeaker is proposed, which adopts no spider and uses structural supports instead of conventional suspension. Different reinforced composite sandwich panels are fabricated and used to make a rectangular flat panel loudspeaker with frequency response range from 120Hz to 20kHz. Harmonic distortions of the flat-panel speakers are measured to study the cause of the distortions. The influences of the nonlinearity of motor force and suspension stiffness on low frequency distortion are investigated and the relation between the mid-frequency-dip and mode shape and the cause of distortion in mid-frequency range are also studied. The displacement distortion recorded from LDV(Laser Doppler Velocimeter) and the sound pressure distortion measured by microphone are used to study the sources of measurement inaccuracy.