| 摘要 |
PURPOSE:To provide the MFB system which obtains the degree of improvement due to stable and sufficient MFB and does not bring about a lack of low-pitched sounds and richly reroduces them by a speaker to which MFB is applied. CONSTITUTION:In a speaker reproducing device, an input signal is amplified by a power amplifier 2 and is supplied to a speaker 3 and is reproduced. The signal corresponding to the speed of the vibration part of the speaker is detected by a bridge circuit 7, and a speed MFB part 4 which applies heavy speed MFB based on this detection signal is provided, and an equalizer 5 which compansates for a lack of low-pitched sounds generated due to much speed MFB by the speed MFB part 4 is provided. MFB is much and stably applied to the speaker 3 by speed MFB alone, and sufficient improvement like distortion reduction is attained, and simultaneously, lowpitched sounds can be richly reproduced by the speaker 3 to which a heavy speed MFB is applied because the equalizer 5 compensates for a lack of low-pitched sounds, and lowpitched sounds are reproduced with good damping. |
