Speaker device and acoustic system

Patent metadata

Field	Value
Publication number	US-12477275-B2
Application number	US-202318192637-A
Country	US
Kind code	B2
Filing date	Mar 29, 2023
Priority date	Mar 30, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A speaker device includes: a limiting unit that limits a signal band of a sound source signal that has been input; a speaker unit that includes a diaphragm; a housing that houses the speaker unit; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency band including a peak frequency of frequency characteristics of an amplitude of the speaker unit in accordance with a shape of the speaker unit and a shape of the housing.

First claim

What is claimed is:

1 . A speaker device comprising:
a limiting unit that limits a signal band of a sound source signal that has been input; a speaker unit that includes a diaphragm; a housing that houses the speaker unit and includes a resonant structure; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency band that includes a peak frequency of frequency characteristics of an amplitude of the speaker unit in accordance with a shape of the speaker unit and a shape of the housing; the housing is a base reflex type enclosure; and the resonant structure is a duct.

2 . A speaker device comprising:
a limiting unit that limits a signal band of a sound source signal that has been input; a speaker unit that includes a diaphragm; a housing that houses the speaker unit; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency band that includes a peak frequency of frequency characteristics of an amplitude of the speaker unit in accordance with a shape of the speaker unit and a shape of the housing; the limiting unit limits a low frequency side of the frequency band; the housing includes a resonant structure; and the resonant structure has a resonance frequency that adjusts a system resonance frequency corresponding to an upper limit of the frequency band to be limited.

3 . A speaker device comprising:
a limiting unit that limits a signal band of a sound source signal that has been input; a speaker unit that includes a diaphragm; a housing that houses the speaker unit; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency band that includes a peak frequency of frequency characteristics of an amplitude of the speaker unit in accordance with a shape of the speaker unit and a shape of the housing, and a clearance between parts of the speaker unit is based on a maximum amplitude of the speaker unit.

4 . The speaker device according to claim 3 , wherein:
the speaker unit further comprises a damper, a voice coil, a yoke, and a plate; and the speaker unit is configured such that a clearance between the damper and the diaphragm, a clearance between the voice coil and the yoke, and a clearance between the damper and the plate are based on the maximum amplitude of the speaker unit.

5 . The speaker device according to claim 3 , wherein the speaker unit is configured such that a clearance between the speaker unit and parts arranged in the speaker device is based on the maximum amplitude of the speaker unit.

6 . A speaker device comprising:
a limiting unit that limits a signal band of a sound source signal that has been input; a speaker unit that includes a diaphragm; a housing that houses the speaker unit; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency band that includes a peak frequency of frequency characteristics of an amplitude of the speaker unit in accordance with a shape of the speaker unit and a shape of the housing, and the speaker unit is a counter drive type speaker unit.

Assignees

• Foster Electric Co Ltd

Inventors

• Yamamoto Takeshi

Classifications

• H04R9/06

  Loudspeakers · CPC title

• H04R2430/01

  Aspects of volume control, not necessarily automatic, in sound systems · CPC title

• H04R9/043 Primary

  Inner suspension or damper, e.g. spider (outer suspension or surround H04R7/16) · CPC title

• H04R9/025

  Magnetic circuit · CPC title

• H04R1/2826

  for loudspeaker transducers · CPC title