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JP2007013264

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007013264
The present invention provides an acoustic system capable of providing a constant acoustic
environment regardless of the number of seated listeners and the operating state of an ON / OFF
operation switch. SOLUTION: A sound system 1 according to the present invention includes a
low-range sound speaker 8 embedded in the lower part of a backrest toward the front of a seat 2,
a sensor 12 for detecting the presence or absence of a listener A seated on the seat 2. Lowpitched sound to the listener A regardless of the output selection means 11 capable of operating
ON / OFF of the acoustic output of the low-range sound speaker 8 and the seating state of the
listener A on the seat 2 And an acoustic output means 10 for outputting an acoustic signal. The
sound output means 10 changes the signal level of the sound signal to be output to the auxiliary
speaker 9 in accordance with the presence or absence of the listener A and the ON / OFF state of
the sound output. [Selected figure] Figure 1
Sound system
[0001]
The present invention is a low-frequency sound speaker embedded under the backrest of the seat
in a state capable of outputting an acoustic signal toward the front of the seat, and an acoustic
output means for outputting the acoustic signal to the low-frequency speaker And an acoustic
system.
[0002]
Today's acoustic systems are in increasing demand for improvement of the acoustic environment
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1
as compared to the prior art, and this tendency is particularly strong in in-vehicle acoustic
systems.
Therefore, we improved the sense of reality by providing a speaker for high frequency sound in
the upper part of the backrest of the seat as well as the vehicle door as before, or by installing a
low frequency sound speaker in the lower part of the backrest. Sound systems and the like have
been proposed (for example, Japanese Patent Application No. 2005-96433).
[0003]
When a low-frequency sound speaker is installed at the lower part of the backrest, the acoustic
signal is transmitted as vibration through the listener's body, so the sense of reality can be
enhanced and the sound can be felt by the body. is there.
[0004]
However, when the low-frequency sound speaker is installed at the lower part of the backrest,
the output sound of the low-frequency sound speaker is blocked when the listener is seated on
the seat, so the signal level transmitted to the ear as sound decreases. There was a problem that.
[0005]
In addition, since the output level of the acoustic signal output as sound from the low-range
sound speaker changes in accordance with the number of listeners who are seated on each invehicle seat, the acoustic effect of the entire cabin space is made constant. It was difficult to keep.
[0006]
Furthermore, when a high frequency sound speaker (or a mid to high frequency sound speaker)
is installed at the upper part of the backrest of the seat, the output sound from the high
frequency sound speaker is hardly affected by the seated listener, but low Since the output level
from the range sound speaker changes according to the number of seated listeners, it has been
difficult to maintain the acoustic balance between the low range sound and the high range sound.
[0007]
Further, the same problem occurs even when the seat is provided with the on / off switch for the
low frequency range speaker.
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2
[0008]
The present invention has been made in view of the above problems, and provides an acoustic
system capable of providing a constant acoustic environment regardless of the number of seated
listeners and the operating state of the ON / OFF operation switch. To be an issue.
[0009]
In order to solve the above problems, an acoustic system according to the present invention
includes a low-frequency sound speaker embedded under the backrest of a seat in a state capable
of outputting an acoustic signal toward the front of the seat, and seated on the seat A sensor for
detecting the presence or absence of a listener, an auxiliary speaker capable of transmitting an
acoustic signal of at least a low frequency sound to the listener regardless of the seating
condition of the listener on the seat, the low frequency A sound speaker and sound output means
for outputting a sound signal to the auxiliary speaker, the sound output means outputting to the
auxiliary speaker according to the presence or absence of the listener detected by the sensor The
signal level of the acoustic signal is changed.
[0010]
In addition, at least two or more sheets provided with the low-range sound speaker are disposed
adjacent to each other, and the sound output means is configured to increase the number of the
listeners seated on each sheet. May be increased.
[0011]
Furthermore, according to the sound system of the present invention, the low frequency sound
speaker embedded in the lower portion of the backrest of the seat in a state capable of
outputting the sound signal toward the front of the seat, and the sound output of the low
frequency sound speaker It is possible to transmit at least low-range sound signals to the listener
regardless of the seating condition of the listener on the seat and the output selection means
capable of operating the seat on / off at the seat. An auxiliary speaker, and an audio output
means for outputting an audio signal to the low band speaker and the auxiliary speaker, wherein
the audio output means turns on the audio output operated by the output selection means. The
signal level of the acoustic signal to be output to the auxiliary speaker is changed according to
the / OFF state.
[0012]
In addition, at least two or more sheets provided with the low-range sound speaker are disposed
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adjacent to each other, and the sound output unit is configured to increase the number of sheets
whose sound output is set to ON by the output selection unit. The signal level of the acoustic
signal may be increased.
[0013]
Furthermore, the audio system according to the present invention detects the low-range sound
speaker embedded under the backrest of the seat and capable of outputting an audio signal
forward of the seat, and detects the presence or absence of the listener seated on the seat Sensor,
an output selection means capable of operating on / off of the sound output of the low-frequency
sound speaker on the sheet, and the listener regardless of the seating state of the listener on the
seat Sound output means for outputting an acoustic signal to the low frequency speaker and the
auxiliary speaker, the auxiliary speaker capable of transmitting at least a low frequency sound
signal; Is output to the auxiliary speaker according to the presence or absence of the listener
detected by the sensor and the ON / OFF state of the sound output operated by the output
selection means. And changes the signal level of the acoustic signal to be.
[0014]
In addition, at least two or more sheets provided with the low-range sound speaker are disposed
adjacent to each other, and the sound output means is configured to increase the number of the
listeners seated on each sheet. The signal level of the acoustic signal may be increased according
to the increase in the number of sheets in which the acoustic output is set to the ON state by the
output selection unit.
[0015]
Furthermore, a first speaker for outputting an L channel signal of the acoustic signal and an R
channel signal of the acoustic signal are provided at an upper portion of a backrest of the seat
and in the vicinity of a head of a listener seated on the seat. A second speaker may be provided,
and the first speaker and the second speaker may output an audio signal in a higher range than
the low range speaker.
[0016]
According to the sound system according to the present invention, the signal level of the sound
signal output from the auxiliary speaker can be changed based on the number of listeners sitting
and the ON / OFF state of the output selection means. Regardless of the number of people and
the ON / OFF state of the output selection means, it is possible to always maintain a constant
acoustic state.
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[0017]
Further, since the low frequency output sound subjected to the signal level adjustment of the
sound signal is outputted from the auxiliary speaker, the low frequency sound can be transmitted
to the listener in a stable state, and the first speaker and the second speaker It is possible to
maintain the balance with the high frequency range sound output from the speaker and to
prevent the deterioration of the sound quality.
[0018]
Hereinafter, an acoustic system according to the present invention will be described using the
drawings.
[0019]
FIG. 1 is a schematic configuration view showing an acoustic system 1 installed in a vehicle
compartment.
An in-vehicle seat (seat) 2 is installed in the passenger compartment, and the in-vehicle seat 2 is
configured of a seat portion 3, a backrest 4 and a headrest 5, as shown in FIG.
[0020]
The sound system 1 includes a pair of first and second speakers 6 and 7 installed above the
backrest 4 of the in-vehicle seat 2, and a woofer unit (speaker for low frequency sound) 8
installed below the backrest 4. A center speaker (auxiliary speaker) 9 installed in front of the
vehicle seat 2, and an acoustic signal output unit (acoustic output means) 10 for outputting an
acoustic signal to each of the speakers 6, 7, 8 and 9; doing.
In addition, in the in-vehicle seat 2, an output selection switch (output selection means) 11
capable of turning on / off the acoustic output from the speakers 6, 7, 8 installed in the in-vehicle
seat 2 is provided. A crew detection sensor (sensor) 12 is provided which detects whether the
listener A is seated on the in-vehicle seat 2 and is provided.
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[0021]
The seat portion 3 is structured to be filled with a highly cushioned urethane material and to
support the listener A from below by a spring material so that the listener A who is seated can
relax.
Further, a slide rail 13 is provided on the bottom surface of the seat portion 3 so that the onvehicle seat 2 can be moved back and forth manually or electrically in the vehicle cabin.
[0022]
The operation switch unit of the output selection switch 11 is installed on the side surface of the
seat portion 3. By operating this operation switch unit, the sound output from the first speaker 6,
the second speaker 7, and the woofer unit 8 is obtained. It is possible to operate ON / OFF of.
[0023]
Furthermore, the seat surface 3 is provided with a crew detection sensor 12 that detects the
presence or absence of the listener A who is seated in the seat by the weight applied to the
seating surface.
The crew detection sensor 12 is a sensor that is generally used in a passenger seat seat belt
warning lamp or the like, and the detailed description thereof is omitted here.
[0024]
The backrest 4 is mounted so as to be able to be raised and lowered with respect to the seat
portion 3, and the angle of the backrest 4 can be adjusted to the favorite angle of the listener A.
[0025]
An upper end portion of the backrest 4 extends above the seat as compared to a general vehicle
seat 2.
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The first speaker 6 and the second speaker 7 are the left and right shoulder opening portions of
the backrest portion 4 and a portion where the surface of the backrest portion 4 is not likely to
be covered by the shoulders of the listener A when the listener A sits down. , And the upper part
of the left and right shoulders of the backrest 4 near the height of the ear of the listener A (near
the ear position).
[0026]
The 1st speaker 6 and the 2nd speaker 7 are BOX enclosure type, and are constituted by a full
range speaker about 50 mm in diameter.
Here, when the listener A is seated, a speaker installed on the left side as viewed from the listener
A is a first speaker 6, and a speaker installed on the right side is a second speaker 7.
In this case, the first speaker 6 outputs an L channel signal of an acoustic signal, and the second
speaker 7 outputs an R channel signal of an acoustic signal.
Note that the first speaker and the second speaker 7 may be installed in reverse, in which case,
the second speaker 7 outputs an L channel signal of an acoustic signal, and the first speaker 6
outputs an acoustic signal. The R channel signal of the signal is output.
[0027]
Both the first speaker 6 and the second speaker 7 are installed such that the sound output
portion (speaker front portion) faces the front of the in-vehicle seat 2.
Each of the speakers 6 and 7 is disposed at a position at which the center position of each of the
speakers 6 and 7 is laterally separated by about 15 cm from the center of the in-vehicle seat 2.
The distances to the left and right ears of the listener A are designed to be equal.
[0028]
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The woofer unit 8 is located in the lower part of the backrest 4, specifically in the vicinity of the
lumbar support and where the bass vibration can be directly applied to the waist of the listener
A. It is buried as if to face.
A woofer speaker with a diameter of about 170 mm is used for the woofer unit 8, and it is
possible to perform audio output in a lower range than the first speaker 6 and the second
speaker 7.
A soft filler that does not impede the transmission of sound and transmission of vibration
between the sound output portion of the woofer unit 8 and the front outer surface of the
backrest portion 4 in order to ensure comfort when the listener A is seated Is provided.
In addition, around the woofer unit is filled with a filling material which is formed in a urethane
and macaroni shape and is excellent in sound and vibration transmission.
[0029]
The headrest 5 is detachably provided on the top of the backrest 4 and is installed to support the
head of the listener A from behind.
[0030]
The center speaker 9 has an intermediate range between the sound signal of the same frequency
as the woofer unit 8 and the sound signal output from the first speaker 6 and the second speaker
7 and the low frequency sound output from the woofer unit 8 (see FIG. It is possible to output an
acoustic signal of mid-range sound).
[0031]
The center speaker 9 is embedded in the center of the instrument panel in the vehicle
compartment, and even when the listener A is seated on the in-vehicle seat 2, an acoustic signal
of middle to low frequency to the listener A is It is installed to be able to communicate.
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The center speaker 9 does not necessarily have to be installed in the instrument panel, and even
when the listener A is seated on the in-vehicle seat 2, the center speaker 9 transmits an acoustic
signal of middle to low range sound to the listener A If possible, it may be embedded in the
ceiling of the cabin or may be installed near the room lamp.
Furthermore, it may be configured to be installed at the left and right front pillar positions
instead of the center position of the instrument panel, or the listener A may arbitrarily change
the installation position.
[0032]
The acoustic signal output unit 10 is installed in an instrument panel.
The sound signal output unit 10 is provided with a level determination unit 16 and a level setting
unit 17.
As shown in FIG. 3, the level determination unit 16 is installed in each vehicle-mounted seat (the
woofer units 8 (8 a to 8 d) and the power amplifiers 18 (18 a to 18 d) are installed on each seat)
The ON / OFF information of the output selection switches 11 (11a to 11d) and the presence /
absence information of the listener of each of the on-vehicle seats 2 detected by the crew
detection sensors 12 (12a to 12d) are transmitted.
The level determination unit 16 determines the signal level of the acoustic signal to be output to
the center speaker 9 according to the acquired ON / OFF information of the output selection
switch 11 and the number of listeners A, and the information of the determined signal level is
determined. It is transmitted to the level setting unit 17.
[0033]
The level setting unit 17 converts the signal level of the acoustic signal to be output to the center
speaker 9 according to the transmitted signal level, and outputs the acoustic signal from the
center speaker 9 via the power amplifier 18 e.
[0034]
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When it is determined from the signal from the crew detection sensor 12 that the listener A is
not seated on the in-vehicle seat 2, reproduction is performed from the speakers 6, 7 and the
woofer unit 8 of the in-vehicle seat 2. Also, the output selection switch 11 of each in-vehicle seat
2 is effective only when the listener A is seated on the in-vehicle seat 2.
[0035]
In the sound system 1 according to the present embodiment, the speakers 6 and 7 are disposed
in the vicinity of the listening position (ear) of the listener A, and the high frequency sound
source outputted from the speakers 6 and 7 is the listener A's Because it is close to the ear, it can
transmit sound at a sufficient level compared to the sound output from the speakers of the other
sheets, and is less susceptible to the output sound from the other speakers.
Therefore, in the sound system 1, the signal level of the low frequency sound of the woofer unit 8
relatively distant from the listening position (ear) of the listener A is corrected using the center
speaker 9.
Hereinafter, a specific example of level correction will be described with reference to FIGS. 4 and
5.
[0036]
FIG. 4 is a diagram showing the relationship between the number of in-vehicle seats to which an
acoustic signal is output from the woofer unit 8 and the signal level of low-frequency sound
transmitted to the vehicle interior by the output sound of the woofer unit 8 .
When the low frequency sound output is performed by the woofer unit 8, the signal level
transmitted to the vehicle interior increases according to the number of vehicle-mounted seats to
which the sound output is performed (see the graph without seating in FIG. 4). Actually, since the
output sound is blocked by the presence of the listener A seated on the seat, the signal level
transmitted to the vehicle interior decreases (see the graph with seating in FIG. 4).
Here, assuming that the desired signal level to be transmitted to the entire vehicle interior is a, as
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shown in FIG. 4, only the signal level lower than the signal level a is transmitted to the vehicle
interior at the signal level with seating. I will.
Therefore, the level determination unit 16 corrects the signal level of the acoustic signal output
from the center speaker 9 based on the number of seats of the on-vehicle seat 2 that is actually
outputting the acoustic signal.
[0037]
FIG. 5 is a graph showing the relationship between the signal level of the output sound output
from the center speaker 9 and the number of in-vehicle seats for which the output selection
switch 11 is set to ON.
[0038]
The low frequency sound output from the woofer unit 8 is reproduced only when the listener A is
seated on the in-vehicle seat 2 and the output selection switch 11 is set to ON, and the output
selection switch 11 is set to ON. In this case, it is considered that the sound signal output from
the woofer unit 8 is always blocked by the listener A.
For this reason, in the graph shown in FIG. 4, the difference between the signal level in the
presence of seating and the signal level a, which changes in accordance with the number of
sheets subjected to acoustic output, is the correction value in the center speaker 9. The level
determination unit 16 changes the signal level of the center speaker 9 according to the number
of seats in the ON state as shown in FIG. 5 so that the signal level of the output sound
transmitted into the vehicle compartment satisfies the signal level a. Make settings as follows.
[0039]
As described above, the level determination unit 16 changes the signal level of the acoustic signal
based on the number of the listener A who is seated and the ON / OFF state of the output
selection switch 11, whereby the number of seats of the listener A can be output. Regardless of
the on / off state of the selection switch 11, it is possible to always maintain a constant acoustic
state.
[0040]
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Furthermore, since the signal level adjustment of the acoustic signal is performed from the center
speaker 9 and the output sound of the medium to low range sound is output, the low range
sound can be transmitted to the listener A in a stable state. It is possible to maintain the balance
with the high frequency range sound output from the speaker 6 and the second speaker 7, and to
prevent the deterioration of the sound quality.
[0041]
As mentioned above, although the acoustic system 1 which concerns on this invention was
demonstrated using drawing, the acoustic system 1 which concerns on this invention is not
limited to embodiment mentioned above, If it is an expert, it will be in a claim It is obvious that
within the scope described, it is obvious that various changes or modifications can be envisaged,
which are of course also understood to fall within the technical scope of the present invention.
[0042]
For example, in the above embodiment, as shown in FIG. 4, the level setting unit 17 changes the
signal level of the acoustic signal based on the number of the listener A who is seated and the ON
/ OFF state of the output selection switch 11. Although it is configured, it is not necessary to
change the signal level taking into consideration both the number of the listener A who is seated
and the ON / OFF state of the output selection switch 11, and the application and use
environment of the acoustic system according to the present invention The signal level may be
changed based on only one of the number of listeners A who are seated or the ON / OFF state of
the output selection switch 11 depending on the user.
[0043]
It is the figure which showed schematic structure of the acoustic system shown in embodiment.
It is a schematic block diagram of the vehicle-mounted seat shown in embodiment, (a) is a front
view, (b) has shown the side view.
It is the figure which showed schematic structure of the acoustic signal output unit.
It is the graph which showed the relationship between the number of the vehicle-mounted seats
in which an acoustic signal is output from a woofer unit, and the signal level of the low-pass
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sound transmitted to a vehicle interior by the output sound of the woofer unit.
It is the graph which showed the relationship between the signal level of the output sound output
from a center speaker, and the number of vehicle-mounted seats in which the output selection
switch was set to ON.
Explanation of sign
[0044]
A ... listener 1 ... sound system 2 ... vehicle seat (seat) 3 ... seat surface 4 ... backrest 5 ... headrest
6 ... first speaker 7 ... second speaker 8, 8a to 8d ... woofer unit (for low-range sound Speakers 9
... Center speakers (auxiliary speakers) 10 ... Sound signal output units (sound signal output
means) 11, 11a to 11d ... Output selection switches (output selection means) 12, 12a to 12d ...
Crew detection sensor (sensors) 13 ... Slide rail 16 ... Level judgment unit 17 ... Level setting unit
18, 18 a to 18 d ... Power amplifier
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