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JP2002084592

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DESCRIPTION JP2002084592
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system including a bass reflex type speaker unit.
[0002]
2. Description of the Related Art In a speaker system, it is important to reproduce low frequency
signals well. However, in order to enable sufficient low-frequency reproduction with a single
speaker, an increase in size of the cabinet is inevitable.
[0003]
Japanese Patent Laid-Open No. 11-266490 discloses a bass reproduction speaker apparatus
comprising a plurality of speaker units as a method for performing low-pass reproduction
without increasing the size of the speaker cabinet. In this speaker device, a speaker cabinet is
configured by a set of speaker units having a plurality of spaces having different volumes from
one another to improve the frequency characteristics and the overall sound pressure level in the
low frequency region.
[0004]
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However, in this speaker system, it is difficult to design the frequency characteristics of the entire
speaker system by a plurality of speaker units.
[0005]
The present invention has been made in view of the above points, and it is an object of the
present invention to provide a speaker unit having an excellent bass reproduction capability,
which is easy to design frequency characteristics etc. using a plurality of speaker units. I assume.
[0006]
SUMMARY OF THE INVENTION According to the present invention, in a speaker system
configured by combining a plurality of bass reflex type speaker units, a speaker system
combining the use bands of each bass reflex type speaker unit The entire frequency
characteristic is designed, and the use band of each speaker unit is a frequency band between the
speaker resonance frequency and the bass reflex port resonance frequency.
Thereby, stable frequency characteristics can be easily obtained.
[0007]
According to a second aspect of the present invention, in the speaker system configured by
combining a plurality of bass reflex type speaker units, the frequency characteristic of the entire
loudspeaker system is designed by combining the use bands of the bass reflex type speaker units.
The present invention is characterized in that frequency characteristics of adjacent speaker units
cross each other at a level within -6 dB from each resonance point in frequency characteristics.
Thereby, the connection point of the frequency characteristic can be smoothed.
[0008]
According to a third aspect of the present invention, in the speaker system configured by
combining a plurality of bass reflex type speaker units, the frequency characteristics of the entire
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loudspeaker system are designed by combining the use bands of the bass reflex type speaker
units. The impedance in the working band of each speaker unit is in the range of 2 Ω to 32 Ω.
This stabilizes the characteristics in the used band.
[0009]
According to a fourth aspect of the present invention, in the speaker system configured by
combining a plurality of bass reflex type speaker units, the frequency characteristics of the entire
loudspeaker system are designed by combining the use bands of the bass reflex type speaker
units. The use band of each speaker unit is a frequency band between the speaker resonance
frequency and the bass reflex port resonance frequency, and the frequency characteristics of the
adjacent speaker units in the frequency characteristic are mutually within a level of -6 dB from
each resonance point It is characterized by crossing. As a result, stable frequency characteristics
can be easily obtained, and connection points of the frequency characteristics can be smoothed.
[0010]
According to a fifth aspect of the present invention, in the speaker system configured by
combining a plurality of bass reflex type speaker units, the frequency characteristic of the entire
loudspeaker system is designed by combining the use bands of the bass reflex type speaker units.
The use band of each speaker unit is a frequency band between the speaker resonance frequency
and the bass reflex port resonance frequency, and the impedance in the use band of each speaker
unit is in the range of 2 Ω to 32 Ω. Thus, stable frequency characteristics can be easily obtained,
and the characteristics in the used band are stabilized.
[0011]
According to the sixth aspect of the present invention, in the speaker system configured by
combining a plurality of bass reflex type speaker units, the frequency characteristics of the entire
loudspeaker system are designed by combining the use bands of the bass reflex type speaker
units. The frequency characteristics of adjacent speaker units in the frequency characteristics
cross each other at a point within -6 dB from each resonance point, and the impedance in the
working band of each speaker unit is in the range of 2 Ω to 32 Ω I assume. Thus, the connection
point of the frequency characteristic can be smoothed and the characteristic in the used band is
stabilized.
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[0012]
According to the seventh aspect of the present invention, in the speaker system configured by
combining a plurality of bass reflex type speaker units, the frequency characteristics of the entire
loudspeaker system are designed by combining the use bands of the bass reflex type speaker
units. The use band of each speaker unit is a frequency band between the speaker resonance
frequency and the bass reflex port resonance frequency, and the frequency characteristics of the
adjacent speaker units in the frequency characteristic are mutually within a level of -6 dB from
each resonance point , And the impedance in the use band of each speaker unit is in the range of
2 Ω to 32 Ω. Thereby, while being able to obtain a stable frequency characteristic easily by this,
the connection point of a frequency characteristic can be made smooth, and also the
characteristic in a use zone is stabilized.
[0013]
The invention according to claim 8 is characterized in that, in the speaker unit according to any
one of claims 1 to 7, the resonance frequency of each bass reflex type speaker unit is determined
by the volume of the speaker unit. Thus, an appropriate resonant frequency can be designed for
each speaker unit.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present
invention will be described below with reference to the drawings.
[0015]
FIG. 1 shows a schematic configuration of a speaker system 10 according to an embodiment of
the present invention.
The speaker system 10 includes a plurality of bass reflex type speaker units 1a, 1b, 1c,. . Are
connected in a row. Each speaker unit 1 is configured by attaching a speaker 2 and a bass reflex
port 3 to a cabinet 4. Each speaker unit 1a, 1b, 1c,. Speakers 2 have corresponding band pass
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filters (BPFs) 5a, 5b, 5c,. It is connected to the. Each band pass filter 5a, 5b, 5c,. Are included in
the network 5. The audio signal to be reproduced is amplified to an appropriate level by the
amplifier 6, and the band pass filters 5a, 5b, 5c,. Supplied to Each band pass filter 5a, 5b, 5c,.
Extracts only the corresponding frequency band components from the input audio signal, and the
speaker units 1a, 1b, 1c,. It supplies to the speaker 2 in the inside.
[0016]
Each of the plurality of bass reflex type speaker units 1 has a loudspeaker resonant frequency fs
and a bass reflex port resonant frequency fp. In the present invention, for each speaker unit 1, a
frequency band between the speaker resonance frequency fs and the bass reflex port resonance
frequency fp is used as a use band. Then, a plurality of speaker units 1 having different use
bands are connected to achieve a wide band in the low frequency band.
[0017]
FIG. 2 shows an example of impedance characteristics and frequency characteristics of each of
the speaker units 1a to 1c. In each of the speaker units 1a to 1c, by appropriately designing the
volume of each cabinet 4, impedance characteristics and frequency characteristics as shown in
FIG. 2 are realized. For each speaker unit, a frequency band between the speaker resonance
frequency fs (fsa to fsc) and the bass reflex port resonance frequency fp (fpa to fpc) is used to
obtain a flat frequency characteristic as a whole.
[0018]
Further, as shown in FIG. 3, the frequency characteristics of each of the speaker units 1a to 1c
are designed to intersect at a point within -6 dB from the resonance point of the characteristics
adjacent to each other. This makes it possible to obtain a smooth characteristic at the connection
portion in the frequency characteristic.
[0019]
Furthermore, it is known that the characteristics in the use band are stabilized by setting the
impedance in each use band to 2 Ω or more and 32 Ω or less in each speaker unit 1.
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[0020]
As described above, the speaker system according to the present invention is composed of a
plurality of bass reflex type loudspeaker units, and based on the loudspeaker resonance
frequency of each loudspeaker unit and the bass reflex port resonance frequency, a plurality of
frequency bands therebetween are used as a usage band. Since the speaker units are connected,
it is easy to design the frequency characteristic.
Further, since the frequency characteristics are designed such that the frequency characteristics
of each speaker unit intersect within -6 dB, it is possible to obtain flat frequency characteristics
over a wide band.
[0021]
According to the speaker system of the present invention, since the speaker system of the
present invention is composed of a plurality of bass reflex type speaker units, wide band can be
realized particularly in the low frequency range, and the output sound pressure level as a whole
is also increased be able to. Further, the entire speaker system can be miniaturized as compared
with the case where the same characteristic is obtained by a single speaker unit. Furthermore, by
inputting a signal to each of the plurality of speaker units, it is possible to increase the input of
the signal.
[0022]
Brief description of the drawings
[0023]
1 is a diagram showing a schematic configuration of a speaker system according to the present
invention.
[0024]
2 is a diagram showing the characteristics of each speaker unit.
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[0025]
3 is a diagram showing a design example of the frequency characteristics by the plurality of
speaker units.
[0026]
Explanation of sign
[0027]
1…スピーカユニット2…スピーカ3…バスレフポート4…キャビネット10…スピーカシステ
ム
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