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JPH06135284

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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 JPH06135284
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker mounting structure of an audio system mounted on a vehicle, and more particularly, to
adjusting the localization of sound in the vehicle.
[0002]
2. Description of the Related Art Conventionally, there is a speaker of an audio system mounted
on a vehicle as a technique in such a field. FIG. 9 is a view showing a speaker position in a
conventional vehicle. As shown in the figure, the speakers of the audio system include, for
example, a front door speaker 2 provided in the front seat of the vehicle 1 and a rear speaker 3
provided in the rear seat. Stereo sound is reproduced on the front seat by the front door speaker
2, and is reproduced on the rear seat by the rear speaker 3.
[0003]
However, there are the following problems in the speaker arrangement of the conventional audio
system. First, since the height position of the speaker is below the position of the rider's ear of
the vehicle, there is a problem that the localization height of the sound image formed by the
reproduced sound by the speaker is lowered.
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[0004]
Second, the left and right speakers are symmetrically installed at the center of the traveling
direction of the vehicle, but the occupant is asymmetrical with respect to this center, so that
there is a problem that the sense of central localization is not clear. Third, there is a problem that
the left and right stereo balance is broken. SUMMARY OF THE INVENTION Accordingly, an object
of the present invention is to provide a room lamp integrated type speaker capable of adjusting
the localization of reproduced sound in a vehicle and improving the effect of a sound field in view
of the above problems.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention is an audio mounted on a vehicle and having a front door speaker and a rear speaker
for reproducing stereo sound on the front and rear seats of the vehicle. In the system, a room
lamp integrated speaker having a speaker integrated integrally with a room lamp attached to the
roof of a vehicle is adapted to change the localization of stereo reproduction sound formed by
the front door speaker and the rear speaker. is there.
[0006]
The room lamp integrated speaker adds a sound effect simulating an acoustic space to the stereo
reproduction sound formed by the rear speaker.
The room lamp integrated speaker is such that directivity is directed to the rear seat. The room
lamp integrated speaker is configured to add the sound effect whose directivity is in the direction
of the rear seat to the stereo reproduction sound formed by the rear speaker.
[0007]
According to the room lamp integrated type speaker of the present invention, since the position
of the room lamp integrated type speaker is higher than the positions of the front door speaker
and the rear speaker, the localization of the reproduced sound can be generally enhanced.
Become. Furthermore, since the position of the room lamp integrated speaker is in front of the
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rear speaker, it is possible to obtain the front localization at the rear seat. Furthermore, it is
possible to return to the center the deviation of the localization with respect to the left-right
asymmetry of the position of the occupant.
[0008]
The sound field effect at the rear seat can be improved by adding the sound effect simulating the
sound space to the stereo reproduction sound formed by the rear speakers. . By directing the
directivity in the direction of the rear seat, it is possible to listen to the sound in the rear seat and
not to hear the sound in the front seat. That is, it becomes possible to obtain the front localization
of the rear seat without affecting the front seat.
[0009]
The effect of the sound field can be improved by adding the sound effect whose directivity is in
the direction of the rear seat to the stereo reproduction sound formed by the rear speakers.
[0010]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall view showing a schematic configuration using a room lamp integrated type
speaker according to a first embodiment of the present invention, and FIG. 2 is an enlarged view
showing a configuration of the room lamp integrated type speaker of FIG. As shown in FIG. 1, a
front door speaker 2, a rear speaker 3 at the rear seat, and a room lamp integrated speaker 4
integrated with a room lamp at the center of the roof are provided in the front seat of the vehicle
1. ing. 2 (a) and 2 (b) are a side sectional view and a front view, respectively, of the room lamp
integrated speaker, and as shown in this figure, the room lamp integrated speaker 4 attached to
the inner lining of the roof 11 of the vehicle 1 , A speaker 41 located in the center, a grille 42
located in front of the speaker 41, and two rooms facing the front and the rear of the vehicle
with respect to the speaker 41 and located in the space formed by the cone and the lining of the
speaker 41 A lamp 43, a wall 44 positioned between the two lamps 43 and the speaker 41, a
glass plate 45 positioned in front of the room lamp 42 and made of a lens, and a switch 46 for
blinking the room lamp 43 Equipped with A hole 13 is provided in the lining 12 of the roof 11
on the back of the speaker 41 so that the sound of the back of the speaker escapes into the space
formed between the lining 12 and the outer plate 14 through the hole 13 .
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[0011]
Such a room lamp integrated type speaker narrows the space in the vehicle interior by using the
thin type speaker in consideration of the design as an integrated type speaker by being combined
with the room lamp 43 in an acoustically convenient position, It can be realized without giving a
sense of discomfort. In the present embodiment, as a particularly important point, (1) the speaker
unit 41 is a thin 8-10 cm diameter full range type (nondirectional unit), and a reproduction
frequency band of about 200 to 16 KHz is required. (2) The grille 42 is preferably punched metal
having good sound permeability. (3) The diameter of the hole 13 provided on the back surface of
the speaker unit 41 is 6 to 8 cm. The reason for providing such a hole is that the necessary
amount (about 1 liter) of back speaker of the speaker 41 can not be obtained. In this manner, the
back pressure of the speaker is drawn out to the space formed by the lining 12 and the outer
plate 14 of the roof 11 so that the low frequency reproduction ability and the overall sound
pressure, the sound quality etc. Can be improved.
[0012]
It is also conceivable to sound the speaker in a closed state without providing the hole 13 in the
back of the speaker instead of this embodiment. Although this is a measure in the case where it is
not desirable to make a hole for reasons such as commonization with various grades of the roof
11, naturally, the sound quality and sound pressure can not be reduced. According to the present
embodiment, since the room lamp integrated speaker 4 is provided at a position higher than the
front door speaker 2 and the rear speaker 3, the localization of the reproduction sound formed
by the front door speaker 2 and the rear speaker 3 is increased. Become able to.
[0013]
In the rear seat, the room lamp integrated speaker 4 is located in front, so that the localization of
the reproduction sound formed by the front door speaker 2 and the rear speaker 3 can be made
forward. Furthermore, since the room lamp integrated speaker 4 is located at the center position
on the left and right with respect to the traveling direction of the vehicle, the localization of the
reproduction sound formed by the left and right front speakers 2 can be centered at each front
seat. In the rear seat, the localization of the reproduced sound formed by the left and right rear
speakers 3 can be centered.
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[0014]
FIG. 3 is a view showing formation of a signal to the room lamp integrated speaker of FIG. 1 in
order to exert a sound field effect. As shown in the figure, the front door speaker 2 receives an FL
(front left) signal and an FR (front right) signal from the head unit (not shown) via the power
amplifier 100, and the rear speaker 3 receives the signal from the head unit. The RL (rear left)
and RR (rear right) signals are input through the power amplifier 100, but the FL (front left)
signal and the FR (front (left) signal are provided in front of the power amplifier 100 of the room
lamp integrated speaker 4. Right) A combining unit 101 which adds the signals or takes their
difference, and a delay circuit 102 which delays the combined signal by a predetermined time,
for example, 30 msec, are provided. In this way, by adding a sound effect simulating the acoustic
space, the room lamp integrated speaker 4 can raise the sound field in the vehicle interior and
can give a feeling of expansion.
[0015]
FIG. 4 is an overall view showing a schematic configuration using a room lamp integrated type
speaker according to a second embodiment of the present invention, and FIG. 5 is an enlarged
view showing a configuration of the room lamp integrated type speaker of FIG. As shown in FIG.
4, the front door speaker 2 and the front center speaker 6 in the front seat of the vehicle 1, the
rear speaker 3 in the rear seat, directivity in the rear seat integrated with the room lamp in the
roof A room lamp integrated speaker 7 is provided. 5A and 5B are a side sectional view and a
front view of the room lamp integrated speaker, respectively, and the components different from
the room lamp integrated speaker 4 of FIG. 2 in the room lamp integrated speaker 7 shown in
this figure Is an observation speaker 47 provided instead of the speaker 41. As shown in FIG. 5A,
the inclination of the cone is made gentle in the rear in order to give directivity to the rear seat.
[0016]
FIG. 6 is a view showing a schematic shape of the oblique speaker, and FIG. 7 is a view showing
directivity of the oblique speaker. The back of the oblique speaker 47 is shown in FIG. 6 (a), and
its side is shown in FIG. 6 (b). FIG. 7A shows a comparison between the central axis of the sound
of the speaker 41 shown in FIG. 2 and the central axis of the sound of the object speaker 47
shown in FIG. FIG. 7 (b) shows directivity patterns of frequencies 6 KHz, 10 KHz and 14 KHz. In
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this manner, the oblique speaker 47 can decenter the cone, which is a diaphragm, and tilt the
central axis of the sound (the direction of the sound).
[0017]
According to the present embodiment, the localization of the reproduced sound can be enhanced
as in the first embodiment, and the assistance in forming the sound field of the forward
localization on the rear seat or adjusting the right and left balance of the sound field Not only can
it be used as a speaker, but it will also be possible to make the back seat listen to the sound but
not all the seats to hear the sound. That is, it becomes possible to obtain the front localization of
the rear seat without affecting the front seat. If it is attempted to make only the rear seat listen to
the sound with the conventional speaker 41 and make the front seat not hear the sound, the
room lamp integrated speaker 4, ie, the room, has directivity in the rear. It is necessary to shift
the lamp to the rear close to the rear seat. As a result, the overall height of the roof from the roof
to the inside increases and the amount of pop-out increases. This is not preferable in terms of
safety such as hitting the head as well as narrowing the interior space of the vehicle as
projections, and also in terms of design. For this reason, in the present embodiment, an oblique
speaker capable of reducing the overall height for the same acoustic performance is adopted.
[0018]
FIG. 8 is a view showing the formation of signals to the room lamp integrated speaker and the
front center speaker of FIG. 4 in order to exert the sound field effect. As shown in the figure, the
front door speaker 2 receives an FL (front left) signal and an FR (front right) signal from the head
unit (not shown) via the power amplifier 100, and the rear speaker 3 receives the signal from the
head unit. The RL (rear left) and RR (rear right) signals are input through the power amplifier
100, but the FL (front left) signal and the FR (front right) are provided in front of the power
amplifier 100 of the front center speaker 6 A signal is added, or a combining unit 103 for
obtaining the difference between them, and a delay circuit 104 for delaying the combined signal
by a fixed time τ1 are provided, and the front stage of the power amplifier 100 of the room
lamp integrated speaker 7 is RL (rear left And the combining unit 105 which adds the signal and
the RR (rear right) signal or takes their difference, and delays the combined signal by a fixed time
τ 2 A ray circuit 106 is provided. In this way, the front center speaker 6 and the room lamp
integrated speaker 7 by the object cone simultaneously add sound effects simulating the acoustic
space at both the front and rear seats simultaneously, and perform left-right balance correction
of the forward localization sound field and sound field become able to.
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[0019]
As described above, according to the present invention, since the position of the room lamp
integrated speaker is higher than the positions of the front door speaker and the rear speaker,
the localization of the reproduced sound can be generally enhanced. Furthermore, since the
position of the room lamp integrated speaker is located in front of the rear speaker, it is possible
to obtain the front localization at the rear seat, and furthermore, the localization shift for the left
and right asymmetry of the occupant position is It is possible to restore the sound field effect at
the rear seat by adding sound effects simulating the acoustic space to the stereo reproduction
sound, and it is possible to improve the directivity of the rear seat. It is possible to listen to the
sound in the rear seat and turn the front seat away from the sound by directing it in the direction
so that the front seat of the rear seat can be obtained without affecting the front seat. about It
becomes possible way.
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