Speaker system having a processing circuitry
AssigneesFujitsu Ten Limited, Timedomain Corporation
InventorsKatsuhiko Tsumori, Akira Nishikawa, Hiroshi Kowaki, Hiroyuki Yoshii
Life of this patent
Estimating the term…
Abstract
A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects to the front side from the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.
Claims3
An acoustic signal output apparatus comprising:
- a speaker unit including a main converter having a first movable portion capable of moving along a predetermined axial line, for converting an electrical signal into mechanical vibration, a vibration plate attached to the first movable portion, for emitting sound waves to a front side of the main converter, and a frame fixed to the main converter, for vibratably supporting the vibration plate from the rear side thereof;
- a compensation converter for converting an electrical signal to mechanical vibration, the compensation converter being fixed to a rear side of the main converter and having a second movable portion capable of moving along the predetermined axial line;
- a compensation mass body attached to the second movable portion, for serving as a load of mechanical vibration of the compensation converter;
- a signal source for generating an electrical signal corresponding to an acoustic signal to be outputted;
- and
- a signal processing circuit for receiving an output of the signal source, amplifying or attenuating the output, and supplying the main converter and the compensation converter with respective electrical signals having such phases that the first movable portion and the second movable portion move in opposite directions.
Dependencies are inferred from the claim text.