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JP2000341780

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2000341780
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound reproducing apparatus, and more particularly to a sound reproducing apparatus useful as
a vehicle.
[0002]
2. Description of the Related Art Generally, in-vehicle speaker devices are often installed on a
front door or the like, and have a speaker layout configuration in which it is difficult to localize a
sound image in front of the central portion. For this reason, conventionally, a center speaker
device for reproducing only a midrange is installed at the center or in front of the center of the
speaker apparatus for the left channel such as the center of the vehicle dashboard and the
speaker apparatus for the right channel. Efforts are being made to position in front of the
department. Hereinafter, a conventional center speaker device installed in the center or in front
of the center of the left channel speaker device and the right channel speaker device will be
described. FIG. 17 is an exploded perspective view of a conventional center speaker device. In
FIG. 17, reference numeral 1701 denotes a speaker unit. A front baffle plate 1702 fixes the
speaker unit 1701. A cabinet 1703 seals the rear acoustic output of the speaker unit 1701 in
combination with the front baffle plate 1702. Reference numeral 1704 denotes a voltage
amplifier that mixes the left channel sound input signal and the right channel sound input signal
and extracts only the midrange signal by a band pass filter. A power amplifier 1705 amplifies the
power of the acoustic signal of the voltage amplifier 1704 and drives the speaker unit 1701. A
power supply unit 1706 supplies power to the voltage amplifier 1704 and the power amplifier
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1705, and a heat sink 1707 dissipates heat generated by the power amplifier 1705 into space.
[0003]
FIG. 18 is a block diagram in the case where the conventional center speaker device is used for
on-vehicle use. In FIG. 18, reference numeral 1801 denotes a left-channel speaker device
attached to the front door of the front passenger seat. Reference numeral 1802 denotes a
speaker device for the right channel attached to the front door on the driver's seat side.
Reference numeral 1803 denotes a conventional center speaker device installed at the center or
in front of the center of the left channel speaker device 1801 and the right channel speaker
device 1802 and reproducing only the midrange. A sound source device 1804 includes a
program source unit such as a CD player or an FM / AM tuner, and a power amplifier unit for
driving the left channel speaker device 1801 and the right channel speaker device 1802.
[0004]
FIG. 19 is a speaker layout diagram when the conventional center speaker device is used for onvehicle use. In FIG. 19, reference numeral 1801 denotes a left channel speaker device attached to
the front door of the front passenger seat. Reference numeral 1802 denotes a speaker device for
the right channel attached to the front door on the driver's seat side. Reference numeral 1803
denotes a conventional center speaker device installed at the center or in front of the center of
the left channel speaker device 1801 and the right channel speaker device 1802 and
reproducing only the midrange. A sound source device 1804 includes a program source unit
such as a CD player or an FM / AM tuner, and a power amplifier unit for driving the left channel
speaker device 1801 and the right channel speaker device 1802.
[0005]
The operation of the conventional center speaker device configured as described above will be
described below.
[0006]
As shown in FIG. 18, the sound source device 1804 comprises a program source unit such as a
CD player or an FM / AM tuner, a speaker device 1801 for the left channel, and a power
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2
amplification unit for driving the speaker device 1802 for the right channel. Sound reproduction
is performed from the left channel speaker device 1801 and the right channel speaker device
1802 connected to the sound source device 1804.
The sound output signal of the program source unit of the sound source device 1804 is also
supplied to the conventional center speaker device 1803, and as shown in FIG. 17, the sound
signal output from the program source unit of the sound source device 1804 is a voltage
amplifier A left channel sound signal and a right channel sound signal are mixed and converted
into a monaural signal, and a band pass filter outputs only a midrange sound signal centered on a
vocal band. The acoustic signal output from the voltage amplifier 1704 is input to the power
amplifier 1705 and power amplified, and then drives the speaker unit 1701. Sound is reproduced
from the speaker unit 1701. The front baffle plate 1702 is for fixing the speaker unit 1701, and
the cabinet 1703 is combined with the front baffle plate 1702 to seal the rear acoustic output of
the speaker unit 1701. Further, the power supply device 1706 supplies power to the voltage
amplifier 1704 and the power amplifier 1705, and the radiator 1707 dissipates the heat of the
power amplifier 1705 into the space. Although FIG. 19 shows the arrangement of the
conventional center speaker device 1803 in the vehicle interior, the left channel speaker device
1801 attached to the front passenger seat front door and the right channel speaker attached to
the vehicle driver's seat front door It is installed in the central part of the vehicle dashboard in
front of the central part of the device 1802. By reproducing the mid-range from the conventional
center speaker device 1803 around the vocal band, the sound image can be centered without
losing the sense of stereo. It can be localized naturally ahead.
[0007]
As described above, even when the speaker apparatus is installed at the front door etc. and it is
difficult to localize the sound image in front of the central part in a car application or the like, the
center of the left channel speaker apparatus and the right channel speaker apparatus By
arranging the conventional center speaker device in front of the central portion or the central
portion to reproduce the midrange, the sound image can be localized in front of the central
portion without losing the sense of stereo, and a natural sound field feeling can be obtained.
[0008]
However, in the conventional center speaker device, even when the speaker device is installed on
the front door or the like in a car-mounted application or the like and the speaker layout in which
it is difficult to localize the sound image in front of the central portion is performed. As described
above, it is possible to obtain a natural sound field feeling by localizing the sound image in front
of the central part and obtaining a natural sound field feeling, but in addition to the speaker
device portion constituted by the speaker unit, the front baffle plate and the cabinet, the left
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channel To a voltage amplifier 1704 which mixes an acoustic input signal and a right channel
acoustic input signal and takes out only a mid band signal with a band pass filter, a power
amplifier 1705 which amplifies the power of the acoustic signal to drive a speaker unit, these
voltage amplifiers Power supply 1706 to supply power, heat generated by the power amplifier
Such as the radiator 1707 is required, there is a problem that miniaturization and weight
reduction is difficult when integrated.
[0009]
The present invention solves the problems in the above-described conventional center speaker
device, and aims to reduce the size and weight of the center speaker device by a simple
configuration that does not require a voltage amplifier, a power amplifier, a power supply device,
or a radiator. I assume.
[0010]
SUMMARY OF THE INVENTION In order to solve this problem, a sound reproducing apparatus
according to the present invention comprises a left channel speaker apparatus to which an audio
output signal from a left channel of a sound source apparatus is connected; A speaker apparatus
for the right channel to which the sound output signal from the channel is connected, a voice coil
for the left channel connected by branching the sound output signal of the left channel, and a
sound output signal of the right channel are branched and connected Voice coil for the right
channel, a voice coil bobbin on which these two voice coils are coaxially mounted, a diaphragm
coupled to the voice coil bobbin, a suspension unit for mechanically supporting the diaphragm
and the voice coil bobbin, and the above two A magnetic circuit unit for applying a magnetic flux
to a voice coil, the suspension unit and the magnetic circuit unit are provided. An audio
reproduction apparatus comprising a frame for attaching a left channel and a speaker apparatus
for the left channel and a center speaker apparatus installed in the center or in front of the
center of the speaker apparatus for the right channel. An acoustic output signal connected to the
device is branched and connected to a speaker unit having a voice coil for two channels on the
left and right, and the center speaker device is constituted only by the speaker unit, the front
baffle plate, and the cabinet. It is.
[0011]
According to the present invention, an audio output signal to be connected from the sound
source device to the left and right two-channel speaker device is branched and connected to the
speaker unit having a voice coil for the two left and right channels. Thus, the center speaker
device can be reduced in size and weight by a simple configuration that eliminates the need for a
voltage amplifier, a power amplifier, a power supply device, and a radiator.
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[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the
present invention is a speaker apparatus for left channel to which an audio output signal from a
left channel of a sound source apparatus is connected, and an audio output from a right channel
of the sound source apparatus. A speaker apparatus for the right channel to which signals are
connected, a voice coil for the left channel connected by branching the sound output signal of the
left channel, and a voice for the right channel connected by branching the sound output signal of
the right channel A coil, a voice coil bobbin coaxially mounted with these two voice coils, a
diaphragm coupled to the voice coil bobbin, a suspension unit for mechanically supporting the
diaphragm and the voice coil bobbin, and magnetic flux to the two voice coils A magnetic circuit
unit to be provided, a frame for mounting the suspension unit and the magnetic circuit unit; A
sound reproducing apparatus comprising a left channel speaker device and a center speaker
device installed in the center or in front of the center of the right channel speaker device,
wherein the sound source device is connected to the left and right two channel speaker devices
Audio output signals can be branched and connected to a speaker unit having voice coils for left
and right two channels, and the speaker unit, the front baffle plate, and the cabinet can constitute
a center speaker device to perform sound reproduction. , A voltage amplifier, a power amplifier, a
power supply device, and a radiator can be made into a simple structure unnecessary, and it has
the effect | action which carries out size reduction of the center speaker apparatus, and weight
reduction.
[0013]
The invention according to claim 2 relates to the signal path from the branch point of the sound
output signal of the left channel to the voice coil for the left channel and the branch point from
the branch point of the sound output signal of the right channel to the right channel. Band pass
filters are connected to the signal path to the voice coil for each, and only the midrange centering
on the vocal band that determines the sound image localization can be reproduced efficiently,
without losing the sense of stereo The left channel speaker device and the right channel speaker
device have the function of localizing the sound image in the center or in front of the center.
[0014]
The invention according to claim 3 is characterized in that in the invention according to claim 1,
the band pass filter is constituted by a combination of a low pass filter and a high pass filter, and
a mid range centered on a vocal band where the effect of sound image localization is large. It is
possible to reproduce only the sound efficiently, and it has the effect of localizing a stable sound
image in the center part or in front of the center part of the speaker apparatus for the left
channel and the speaker apparatus for the right channel without losing stereo feeling.
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[0015]
The invention according to claim 4 relates to the signal path from the branch point of the sound
output signal of the left channel to the voice coil for the left channel and the branch point from
the branch point of the sound output signal of the right channel to the right channel. A high pass
filter is connected to each of the signal paths to the voice coil and a reflection plate having a high
cut filter function is installed in front of the diaphragm of the center speaker device, and the high
cut effect by the mechanical reflection plate Even if the low-pass filter is unnecessary by using
the second embodiment, it is possible to efficiently reproduce only the middle range centered on
the vocal band where the effect of sound image localization is large, and therefore the left
channel speaker device A stable sound image is localized at the center or in front of the center of
the right channel speaker device It has the effect that.
[0016]
The invention according to claim 5 relates to the signal path from the branch point of the sound
output signal of the left channel to the voice coil for the left channel and the branch point from
the branch point of the sound output signal of the right channel to the right channel. The low
pass filter is connected to each of the signal paths to the voice coil and the mechanical low cut
filter function is provided to move the lowest resonance frequency of the center speaker device
to the high frequency side, which is mechanical Even if the high-pass filter is unnecessary by
using the low-cut effect, it is possible to efficiently reproduce only the mid-range centered on the
vocal band where the effect of sound image localization is large, so for the left channel A stable
sound image in the center or in front of the center of the speaker device and the speaker device
for the right channel It has the effect of position.
[0017]
According to a sixth aspect of the present invention, in the first aspect, a reflector having a high
cut filter function is installed in front of the diaphragm of the center speaker device, and the
lowest resonance frequency of the center speaker device is set to the high frequency side. It is
configured to have a mechanical low-cut filter function to be moved, and by using the high-cut
effect by the mechanical reflector and the mechanical low-cut effect in combination, even if a low
pass filter or a high pass filter is not necessary. Since it is possible to efficiently reproduce only
the mid-tone range centered on the vocal band where the effect of sound image localization is
large, the left-channel speaker device and the right-channel speaker device at the center or in
front of the center without losing stereo feeling. Function to localize a stable sound image.
[0018]
Hereinafter, embodiments of the present invention will be described using FIGS. 1 to 16.
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[0019]
(First Embodiment) FIG. 1 shows an exploded perspective view of a center speaker device in the
sound reproduction apparatus of the first embodiment, and 101 in FIG. 1 is a voice coil for the
left channel.
Reference numeral 102 denotes a right channel voice coil.
Reference numeral 103 denotes a voice coil bobbin on which the voice coil 101 and the voice
coil 102 are coaxially mounted.
Reference numeral 104 denotes a diaphragm which is coupled to the voice coil bobbin 103 and
performs sound reproduction by its driving force.
A suspension unit 105 mechanically supports the diaphragm 104 and the voice coil bobbin 103.
A magnetic circuit unit 106 applies a magnetic flux to the voice coil 101 and the voice coil 102.
Reference numeral 107 denotes a frame on which the suspension unit 105 and the magnetic
circuit unit 106 are attached to form a speaker unit.
Reference numeral 108 denotes a front baffle plate to which the speaker unit is attached.
Reference numeral 109 denotes a cabinet which is combined with the front baffle plate 108 to
seal the rear acoustic output of the speaker unit.
[0020]
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7
FIG. 2 shows a block diagram of the case where the sound reproducing apparatus of the first
embodiment is used for on-vehicle use, and in FIG.
Reference numeral 202 denotes a speaker device for the right channel attached to the front door
on the driver's seat side.
Reference numeral 203 denotes a center speaker device installed at the center or in front of the
center of the left channel speaker device 201 and the right channel speaker device 202.
A sound source device 204 includes a program source unit such as a CD player or an FM / AM
tuner, and a power amplifier unit for driving the speaker device 201 for the left channel and the
speaker device 202 for the right channel.
The sound input signal of the center speaker device 203 is obtained from the branch point of the
sound output signal from the sound source device 204 to the left channel speaker device and the
right channel speaker device.
[0021]
FIG. 3 is a speaker layout diagram when the sound reproducing apparatus of the first
embodiment is used for on-vehicle use. In FIG. 3, reference numeral 201 denotes a speaker
device for the left channel attached to the front door on the front passenger seat side of the
vehicle. Reference numeral 202 denotes a speaker device for the right channel attached to the
front door on the driver's seat side. Reference numeral 203 denotes a center speaker device
installed at the center or in front of the center of the left channel speaker device 201 and the
right channel speaker device 202. A sound source device 204 includes a program source unit
such as a CD player or an FM / AM tuner, and a power amplifier unit for driving the speaker
device 201 for the left channel and the speaker device 202 for the right channel.
[0022]
FIG. 4 shows a block diagram of a modification of the sound reproducing apparatus of the first
embodiment for use in a car, and in FIG. 4, 201 is a speaker apparatus for the left channel
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attached to the front door of the vehicle passenger side . Reference numeral 202 denotes a
speaker device for the right channel attached to the front door on the driver's seat side.
Reference numeral 203 denotes a center speaker device installed at the center or in front of the
center of the left channel speaker device 201 and the right channel speaker device 202. A sound
source device 204 includes a program source unit such as a CD player or an FM / AM tuner, and
a power amplifier unit for driving the speaker device 201 for the left channel and the speaker
device 202 for the right channel. A band pass filter 401 is connected to a signal path from the
branch point of the sound output signal from the sound source device 204 to the speaker device
for the left channel and the speaker device for the right channel to the center speaker device
203. It extracts only the midrange range.
[0023]
FIG. 5 shows the output sound pressure frequency characteristics of the center speaker device
203 of the modification of the sound reproduction device of the first embodiment, and in FIG. 5,
501 is the output sound pressure frequency characteristics of the center speaker device 203.
[0024]
FIG. 6 shows a block diagram of a modification of the sound reproducing apparatus of the first
embodiment for use in a car, and in FIG. 6, 201 is a speaker apparatus for the left channel
attached to the front door of the vehicle passenger side. .
Reference numeral 202 denotes a speaker device for the right channel attached to the front door
on the driver's seat side. Reference numeral 203 denotes a center speaker device installed at the
center or in front of the center of the left channel speaker device 201 and the right channel
speaker device 202. A sound source device 204 includes a program source unit such as a CD
player or an FM / AM tuner, and a power amplifier unit for driving the speaker device 201 for
the left channel and the speaker device 202 for the right channel. A low-pass filter 601 is
connected to a signal path from the branch point of the sound output signal from the sound
source device 204 to the speaker device for the left channel and the speaker device for the right
channel to the center speaker device 203. A high pass filter 602 is connected to a signal path
from the branch point of the sound output signal from the sound source device 204 to the
speaker device for the left channel and the speaker device for the right channel to the center
speaker device 203. The combination of the low pass filter 601 and the high pass filter 602
constitutes a band pass filter.
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[0025]
FIG. 7 shows the output sound pressure frequency characteristic of the center speaker device
203 of the modification of the sound reproduction device of the first embodiment. In FIG. 7, 701
is the output sound pressure frequency characteristic of the center speaker device 203.
[0026]
FIG. 8 shows an exploded perspective view of a center speaker device in a modification of the
sound reproduction device of the first embodiment, and 101 in FIG. 8 is a voice coil for the left
channel.
Reference numeral 102 denotes a right channel voice coil. Reference numeral 103 denotes a
voice coil bobbin on which the voice coil 101 and the voice coil 102 are coaxially mounted.
Reference numeral 104 denotes a diaphragm which is coupled to the voice coil bobbin 103 and
performs sound reproduction by its driving force. A suspension unit 105 mechanically supports
the diaphragm 104 and the voice coil bobbin 103. A magnetic circuit unit 106 applies a
magnetic flux to the voice coil 101 and the voice coil 102. Reference numeral 107 denotes a
frame on which the suspension unit 105 and the magnetic circuit unit 106 are attached to form a
speaker unit. Reference numeral 108 denotes a front baffle plate to which the speaker unit is
attached. Reference numeral 109 denotes a cabinet which is combined with the front baffle plate
108 to seal the rear acoustic output of the speaker unit. Reference numeral 801 denotes a
reflector having a high cut function for attenuating the high range of the sound reproduction
output radiated from the diaphragm 104.
[0027]
FIG. 9 shows a block diagram of a modification of the sound reproducing apparatus of the first
embodiment for use in a car, and in FIG. 9, 201 is a speaker apparatus for the left channel
attached to the front door on the passenger side of the vehicle. . Reference numeral 202 denotes
a speaker device for the right channel attached to the front door on the driver's seat side.
Reference numeral 203 denotes a center speaker device installed at the center or in front of the
center of the left channel speaker device 201 and the right channel speaker device 202. A sound
source device 204 includes a program source unit such as a CD player or an FM / AM tuner, and
a power amplifier unit for driving the speaker device 201 for the left channel and the speaker
device 202 for the right channel. A high pass filter 602 is connected to a signal path from the
branch point of the sound output signal from the sound source device 204 to the speaker device
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for the left channel and the speaker device for the right channel to the center speaker device
203. Here, a band pass filter is configured by a combination of the high cut function reflector
801 configured in the center speaker device 203 and the high pass filter 602.
[0028]
FIG. 10 shows the output sound pressure frequency characteristic of the center speaker device
203 of the modification of the sound reproduction device of the first embodiment. In FIG. 10,
1001 is the output sound pressure frequency characteristic of the center speaker device 203.
[0029]
FIG. 11 shows an exploded perspective view of a center speaker device in a modification of the
sound reproduction device of the first embodiment, and 101 in FIG. 11 is a voice coil for the left
channel.
Reference numeral 102 denotes a right channel voice coil. Reference numeral 103 denotes a
voice coil bobbin on which the voice coil 101 and the voice coil 102 are coaxially mounted.
Reference numeral 104 denotes a diaphragm which is coupled to the voice coil bobbin 103 and
performs sound reproduction by its driving force. A suspension unit 105 mechanically supports
the diaphragm 104 and the voice coil bobbin 103. A magnetic circuit unit 106 applies a
magnetic flux to the voice coil 101 and the voice coil 102. Reference numeral 107 denotes a
frame on which the suspension unit 105 and the magnetic circuit unit 106 are attached to form a
speaker unit. Reference numeral 108 denotes a front baffle plate to which the speaker unit is
attached. 109 is a cabinet which is combined with the front baffle plate 108 to seal the rear
acoustic output of the speaker unit, and has an internal volume to have a mechanical low cut
filter function to move the lowest resonance frequency of the center speaker device 203 to the
high frequency side It is less. Reference numeral 1101 denotes a sound absorbing material that
reduces the volume of the cabinet 109 and suppresses the increase in the quality factor that
occurs when the lowest resonance frequency of the center speaker device 203 is moved to the
high frequency side.
[0030]
FIG. 12 shows a block diagram of a modification of the sound reproducing apparatus of the first
embodiment for use in a car, and in FIG. 12, 201 is a speaker apparatus for the left channel
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attached to the front door on the passenger side of the vehicle. . Reference numeral 202 denotes
a speaker device for the right channel attached to the front door on the driver's seat side.
Reference numeral 203 denotes a center speaker device installed at the center or in front of the
center of the left channel speaker device 201 and the right channel speaker device 202. A sound
source device 204 includes a program source unit such as a CD player or an FM / AM tuner, and
a power amplifier unit for driving the speaker device 201 for the left channel and the speaker
device 202 for the right channel. A low-pass filter 601 is connected to a signal path from the
branch point of the sound output signal from the sound source device 204 to the speaker device
for the left channel and the speaker device for the right channel to the center speaker device
203. Here, a band pass filter is configured by a combination of the mechanical low cut filter
function configured in the center speaker device 203 and the low pass filter 601.
[0031]
FIG. 13 shows the output sound pressure frequency characteristics of the center speaker device
203 of the modification of the sound reproduction device of the first embodiment. In FIG. 13,
1301 is the output sound pressure frequency characteristics of the center speaker device 203.
[0032]
FIG. 14 shows an exploded perspective view of the center speaker device in a modification of the
sound reproduction device of the first embodiment. In FIG. 14, 101 is a voice coil for the left
channel.
Reference numeral 102 denotes a right channel voice coil. Reference numeral 103 denotes a
voice coil bobbin on which the voice coil 101 and the voice coil 102 are coaxially mounted.
Reference numeral 104 denotes a diaphragm which is coupled to the voice coil bobbin 103 and
performs sound reproduction by its driving force. A suspension unit 105 mechanically supports
the diaphragm 104 and the voice coil bobbin 103. A magnetic circuit unit 106 applies a
magnetic flux to the voice coil 101 and the voice coil 102. Reference numeral 107 denotes a
frame on which the suspension unit 105 and the magnetic circuit unit 106 are attached to form a
speaker unit. Reference numeral 108 denotes a front baffle plate to which the speaker unit is
attached. Reference numeral 109 denotes a cabinet which is combined with the front baffle plate
108 to seal the back sound output of the speaker unit, and has a volume to mechanically have a
low-cut filter function by moving the lowest resonance frequency of the center speaker device
203 toward the high frequency Less Reference numeral 801 denotes a reflector having a high
cut function for attenuating the high range of the sound reproduction output radiated from the
diaphragm 104. Reference numeral 1101 denotes a sound absorbing material that reduces the
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volume of the cabinet 109 and suppresses the increase in the quality factor that occurs when the
lowest resonance frequency of the center speaker device 203 is moved to the high frequency
side.
[0033]
FIG. 15 shows a block diagram of the case where the sound reproducing apparatus of the first
embodiment is used for on-vehicle use, and in FIG. 15, reference numeral 201 denotes a speaker
apparatus for the left channel attached to the front door on the passenger side. Reference
numeral 202 denotes a speaker device for the right channel attached to the front door on the
driver's seat side. Reference numeral 203 denotes a center speaker device installed at the center
or in front of the center of the left channel speaker device 201 and the right channel speaker
device 202. A sound source device 204 includes a program source unit such as a CD player or an
FM / AM tuner, and a power amplifier unit for driving the speaker device 201 for the left channel
and the speaker device 202 for the right channel. The sound input signal of the center speaker
device 203 is obtained from the branch point of the sound output signal from the sound source
device 204 to the left channel speaker device and the right channel speaker device. Here, a band
pass filter is configured by a combination of a reflective plate 801 having a high cut function and
a mechanical low cut filter function configured in the center speaker device.
[0034]
FIG. 16 shows the output sound pressure frequency characteristic of the center speaker device
203 of the modification of the sound reproduction device of the first embodiment. In FIG. 16,
1601 is the output sound pressure frequency characteristic of the center speaker device 203.
[0035]
The operation of the sound reproduction device of the first embodiment configured as described
above and its modification will be described below.
[0036]
The sound reproduction apparatus according to the first embodiment shown in FIGS. 1, 2 and 3
will be described.
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13
As shown in FIG. 2, the sound source device 204 is composed of a program source unit such as a
CD player or FM / AM tuner, a speaker device 201 for the left channel, and a power amplifier for
driving the speaker device 202 for the right channel. Sound reproduction is performed from the
left channel speaker device 201 and the right channel speaker device 202 connected to the
sound source device 204.
Further, the sound input signal to the center speaker device 203 is supplied from a branch point
of the sound output signal from the sound source device 204 to the speaker device for the left
channel and the speaker device for the right channel, as shown in FIG. An acoustic signal
obtained from the branch point of the channel speaker device 201 is input to the voice coil 101,
and similarly, an acoustic signal obtained from the branch point of the right channel speaker
device 202 is input to the voice coil 102, via the voice coil bobbin 103. Although the diaphragm
104 is driven to perform sound reproduction, the current directions of the left channel sound
signal and the right channel sound signal are configured to be the same, so the sound signals of
the left and right channels are mixed equivalently. The sound can be reproduced with the
monaural signal.
[0037]
The suspension unit 105 mechanically supports the diaphragm 104 and the voice coil bobbin
103, and the magnetic circuit unit 106 applies a magnetic flux so that a driving force is
generated when current flows through the voice coil 101 and the voice coil 102. There is. The
frame 107 is for attaching the suspension unit 105 and the magnetic circuit unit 106 to form a
speaker unit, and the front baffle plate 108 attaches and fixes the speaker unit and, at the same
time, combines with the cabinet 109 to output the back sound output of the speaker unit. Sealed
to prevent interference with the front sound output of the speaker unit.
[0038]
Although FIG. 3 shows the arrangement of the center speaker device 203 in the vehicle interior,
the left channel speaker device 201 attached to the front passenger seat side front door and the
right channel speaker device 202 attached to the vehicle driver side front door The sound image
can be naturally localized in front of the central portion by reproducing the monaural signal
obtained by mixing both the left and right channels from the center speaker device 203. .
[0039]
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14
A modification of the sound reproduction device of the first embodiment shown in FIGS. 4 and 5
will be described.
As shown in FIG. 4, the sound source device 204 is composed of a program source unit such as a
CD player or an FM / AM tuner, a left channel speaker device 201, and a power amplification
unit for driving the right channel speaker device 202. Sound reproduction is performed from the
left channel speaker device 201 and the right channel speaker device 202 connected to the
sound source device 204. Further, the band pass filter 401 is connected to the signal path from
the branch point of the sound output signal from the sound source device 204 to the speaker
device for the left channel and the speaker device for the right channel to the center speaker
device 203. By reproducing only the middle range centered on the vocal band, it is possible to
naturally localize the sound image in front of the central portion without losing the sense of
stereo.
[0040]
FIG. 5 shows the output sound pressure frequency characteristic 501 of the center speaker
device 203 of the modification of the sound reproduction device of the first embodiment, but
only the midrange centered on the vocal band related to sound image localization without
impairing the stereo feeling. Can be played.
[0041]
A modification of the sound reproduction device of the first embodiment shown in FIGS. 6 and 7
will be described.
As shown in FIG. 6, the sound source device 204 is composed of a program source unit such as a
CD player or FM / AM tuner, a power amplification unit for driving the left channel speaker
device 201 and the right channel speaker device 202. Sound reproduction is performed from the
left channel speaker device 201 and the right channel speaker device 202 connected to the
sound source device 204. Also, a low pass filter 601 and a high pass filter 602 are connected to
the signal path from the branch point of the sound output signal from the sound source device
204 to the left channel speaker device and the right channel speaker device to the center speaker
device 203, respectively. By reproducing only the middle range centered on the vocal band from
the speaker device 203, the sound image can be naturally localized in front of the central portion
without losing the sense of stereo.
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15
[0042]
FIG. 7 shows the output sound pressure frequency characteristic 701 of the center speaker
device 203 of the modification of the sound reproduction device of the first embodiment, but
only the midrange centered on the vocal band related to sound image localization without
impairing the stereo feeling. Can be played.
[0043]
A modification of the sound reproduction device of the first embodiment shown in FIGS. 8, 9 and
10 will be described.
As shown in FIG. 9, the sound source device 204 comprises a program source unit such as a CD
player or an FM / AM tuner, a power channel for driving the left channel speaker device 201 and
the right channel speaker device 202. Sound reproduction is performed from the left channel
speaker device 201 and the right channel speaker device 202 connected to the sound source
device 204. Also, a high-pass filter 602 is connected to the signal path from the branch point of
the sound output signal from the sound source device 204 to the speaker device for the left
channel and the speaker device for the right channel to the center speaker device 203 at the
same time. The high frequency range of the sound reproduction output radiated from the
diaphragm 104 is attenuated by the reflection plate 801 having the high cut function. FIG. 10
shows the output sound pressure frequency characteristic 1001 of the center speaker device
203 of the modification of the sound reproduction device of the first embodiment, but only the
midrange centered on the vocal band related to sound image localization without impairing the
stereo feeling. Can be played.
[0044]
A modification of the sound reproduction device of the first embodiment shown in FIGS. 11, 12
and 13 will be described. As shown in FIG. 12, the sound source device 204 is composed of a
program source unit such as a CD player or FM / AM tuner, a power amplification unit for
driving the left channel speaker device 201 and the right channel speaker device 202. Sound
reproduction is performed from the left channel speaker device 201 and the right channel
speaker device 202 connected to the sound source device 204. Also, low-pass filter 601 is
connected to the signal path from the branch point of the sound output signal from the sound
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16
source device 204 to the speaker device for the left channel and the speaker device for the right
channel to the center speaker device 203 at the same time. Similarly, the cabinet 109 has a lowcut filter function mechanically by setting the internal volume small and moving the lowest
resonance frequency of the center speaker device 203 toward the high frequency side, but the
internal volume of the cabinet 109 is small Then, the quality factor of the center speaker device
203 also rises, and this is suppressed by the sound absorbing material 1101. FIG. 13 shows the
output sound pressure frequency characteristic 1201 of the center speaker device 203 of the
modification of the sound reproduction device of the first embodiment, but only the midrange
centered on the vocal band related to sound image localization without impairing the stereo
feeling. Can be played.
[0045]
A modification of the sound reproduction device of the first embodiment shown in FIGS. 14, 15,
and 16 will be described. As shown in FIG. 15, the sound source device 204 is composed of a
program source unit such as a CD player or FM / AM tuner, a power amplification unit for
driving the left channel speaker device 201 and the right channel speaker device 202. Sound
reproduction is performed from the left channel speaker device 201 and the right channel
speaker device 202 connected to the sound source device 204. Further, an acoustic input signal
to the center speaker device 203 is supplied from a branch point of an acoustic output signal
from the sound source device 204 to the left channel speaker device and the right channel
speaker device. At the same time, as shown in FIG. 14, the high range of the sound reproduction
output radiated from the diaphragm 104 is attenuated by the reflection plate 801 having a high
cut function. In addition, the cabinet 109 is configured to mechanically have a low-cut function
by setting the internal volume small and moving the lowest resonance frequency of the center
speaker device 203 toward the high frequency side, but if the internal volume of the cabinet 109
is reduced Since the quality factor of the center speaker device 203 also increases, this is
suppressed by the sound absorbing material 1101. FIG. 16 shows the output sound pressure
frequency characteristics 1201 of the center speaker device 203 of the modification of the sound
reproduction device of the first embodiment, but only the midrange centered on the vocal band
related to sound image localization without impairing the stereo feeling. Can be played.
[0046]
As described above, according to the present invention, the audio output signal connected from
the sound source device to the left and right two-channel speaker device is branched and
connected to the speaker unit having the voice coil for the two left and right channels, Since the
center speaker device is configured by only the speaker unit, the front baffle plate, and the
cabinet to perform sound reproduction, the center speaker device can be miniaturized by a
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17
simple configuration that does not require a voltage amplifier, a power amplifier, a power supply
device, or a radiator. It is possible to reduce the weight.
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