MFB speaker system with controllable speaker vibration characteristic
AssigneeMitsubishi Electric Engineering Company Limited
InventorNoboru Kyono
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Abstract
An acoustic signal is input to a first voice coil of a speaker unit. A vibration information detecting unit comprised of a vibrational displacement detecting unit, a vibrational velocity detecting unit, a vibrational acceleration detecting unit, amplifiers, and an adder adds a signal indicating the vibrational displacement x, a signal indicating the vibrational velocity v and a signal indicating the vibrational acceleration α. A power amplifier inputs the sum signal to a second voice coil of the speaker unit using a positive feedback or negative feedback.
Claims26
A motional feedback (MFB) speaker system, comprising:
- a speaker having a diaphragm, a first voice coil and a second voice coil, said first voice coil receiving an electrical sound signal representing audible sound information and causing said diaphragm to vibrate in response to said electric signal to reproduce said audible sound information;
- a vibrational detector for detecting a vibrational parameter of said diaphragm, and developing an electrical vibration signal corresponding to said detected vibrational parameter;
- and
- an amplifier for receiving said electrical vibration signal, amplifying said electrical vibration signal only, and outputting the amplified electrical vibration signal to said second voice coil with one of either a positive or a negative polarity with respect to said electrical sound signal, the primary speaker driving function being separated from said amplifier.
Dependencies are inferred from the claim text.