| 摘要 |
PURPOSE:To faithfully execute the action of a vibrator by means of the action of an electric signal by detecting the position of the vibrator with respect to the housing of a speaker, computing a difference between the position at prescribed time and the position of the vibrator, which corresponds to the electric signal at that time and correcting the subsequent electric signal by means of the difference. CONSTITUTION:A sensor probe 9 is fitted to a housing 7 in a position confronting a reflector 8, and it is judged to become '0' when a source input signal is '0'. Output signals obtained from three places are average in an encoder processor 10, and the average value is furthermore digitized, whereby position measurement data can be obtained. On the other hand, the electric signal as sound information is transmitted to a sound pressure adjuster 13, where the signal is adjusted, and the signal is inputted to a position control processor 11. It computes the difference between real position data of the vibrator at the prescribed time and the position of the vibrator, which is to correspond to the electric signal at that time, corrects the subsequent electric signal and transmits it to a voice coil 2. |
