| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker device capable of controlling a vibration characteristic corresponding to the type, etc., of a sound source, etc., by realizing the combination of respective systems of an MFB (motional feed back) without making a speaker large and without making a structure complicated. SOLUTION: This speaker device is provided with one amplitude detector 12 for detecting voltage that is proportional to the movement of a vibration system of a speaker 11 and two feedback members or more among an amplitude type feedback circuit 14A for feedbacks feedback voltage that is proportional to the amplitude of the vibration system of the speaker 11 to a driving amplifier 15 on the basis of the detected voltage from the amplitude detector 12, a speed type feedback circuit 14B for feedbacking feedback voltage that is proportional to the speed of the vibration system of the speaker 11 to the driving amplifier 15 on the basis of the detected voltage and an acceleration type feedback circuit 14C for feedbacking feedback voltage that is proportional to the acceleration of the vibration system of the speaker 11 to the driving amplifier 15 on the basis of the detected voltage. COPYRIGHT: (C)2005,JPO&NCIPI |
