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JP2007030732

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DESCRIPTION JP2007030732
An object of the present invention is to provide an acoustic system capable of always providing
high-quality sound even when the number of occupants is different by combining a conventional
door speaker system and a seat speaker system. An audio system mounted on a vehicle, which is
a first speaker set (5) arranged in the vehicle body, which is substantially optimized for a driver's
seat, and arranged mainly for each seat for each seat The control device 1 is provided with a
second speaker set 7 substantially optimized, an occupant detection means 3 for detecting the
number or position of the occupant, and the control device 1. It is characterized in that output is
performed using any one or both or a partial combination of the first speaker set 5 and the
second speaker set 7. [Selected figure] Figure 1
Sound system
[0001]
The present invention relates to a system for always providing high-quality sound even when the
number of occupants is different in a vehicle-mounted sound system.
[0002]
Conventionally, various configurations have been proposed to provide high-quality sound as an
on-vehicle acoustic system.
In a typical on-vehicle audio system, a plurality of speakers are connected to an audio device to
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play music. The speakers have one set of speaker sets for the entire vehicle space (typically, a
door speaker system) and a speaker set for each seat so that music can be optimally listened to in
each seat There is something that can be done (seat speaker system).
[0003]
The configuration of the door speaker system is basically based on the front door speakers
provided on the left and right front doors, and further, the rear speakers provided on the left and
right rear doors, the woofer for bass reproduction, the doors and instruments arranged at the
rear of the vehicle For example, a tweeter for high-pitched sound reproduction provided in a
mentor panel can be mentioned.
[0004]
The configuration of the seat speaker system is basically based on speakers disposed at
shoulders on both upper sides of the backrest of the seat or headrest speakers disposed on both
sides of the headrest.
Furthermore, there are also cases where a low frequency speaker for bass or vibration is
provided in the backrest portion or the seat portion, and a center speaker for sound image
localization is provided in front of the seat.
[0005]
By the way, the door speaker system and the seat speaker system have their advantages and
disadvantages.
[0006]
Since the door speaker system tends to increase the number of speakers, it can provide a
pleasant feeling of wrapping.
However, in the case of a door-speaker system, when the music is played on the door-speaker, it
is usually tuned so that it sounds best at the driver's seat. For example, processing such as
frequency correction or correction of the difference in distance from each speaker to the ear is
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performed. However, if there is a passenger in the front passenger seat as well as the driver, the
reproduction sound of each speaker is processed so that it can be heard optimally in the driver's
seat. There is a problem that you can not listen to music at Also for the driver, there is a
possibility that the reflection and the frequency characteristic of the sound in the vehicle
compartment may change due to the influence of the passenger, and it is difficult to always listen
in the optimally tuned state.
[0007]
The seat speaker system suppresses noise ingress and leak noise to the surroundings by
arranging a speaker in the vicinity of the listener's (passenger's) ear, and aims to reduce
production cost and power consumption by reducing the output. It is possible. In particular, since
sound tuning can be performed on a seat-by-seat basis, music can be optimally listened to in each
seat, and it is not easily affected by passengers. Furthermore, by generating vibration of the lowpitched part on the seat, it is possible to expect an increase in presence and force. However,
when the seat speaker system is used alone, the distance between the speaker position and the
ear is short, so the sound spreads even if the audio signal processing (sound effect etc.) is added
compared to the conventional door speaker system. It may be inferior. In addition, there is a
problem that the number of speakers decreases, and the feeling of wrapping tends to decrease.
[0008]
Conventionally, a configuration has been proposed in which speakers to be output are selected or
controlled depending on the situation. JP-A-5-191342 (Patent Document 1) proposes a control
for not outputting from a door speaker during a call in a vehicle-mounted acoustic system
provided with both a door speaker and a seat speaker. According to JP 2005-88664 (Patent
Document 2), in an on-vehicle AV apparatus provided with a display on each seat, a control
circuit of a speaker is controlled to optimize reproduction sound on the seat where the display is
turned on. Has been proposed. JP-A-5-191342 JP-A-2005-88664
[0009]
The present invention provides a sound system mounted on a vehicle, which can combine the
conventional door speaker system and the seat speaker system and can always provide high
quality sound even if the number of occupants is different. The purpose is.
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[0010]
In order to solve the above-mentioned problems, a typical configuration of an acoustic system
according to the present invention is an acoustic system mounted on a vehicle, which is a first
configuration substantially optimized for a driver's seat and disposed in the vehicle body. The
control device includes a speaker set, a second speaker set mainly disposed in each seat and
substantially optimized for each seat, an occupant detection means for detecting the number or
position of an occupant, and a control device. The present invention is characterized in that
output is performed using one or both or a partial combination of the first speaker set and the
second speaker set on the basis of the detection result of the occupant detection means.
In this way, different control can be performed depending on whether one is riding alone or two
or more people are riding.
[0011]
The control device outputs using the first speaker set when the number of occupants detected by
the occupant detection means is one, and the second speaker set when the number of occupants
is two or more. It is characterized by outputting using. As a result, it is possible to provide
optimally tuned music both when riding alone and when riding by two or more people.
[0012]
The second speaker set includes a low frequency speaker for bass or vibration in a backrest
portion or a seat portion, and the control device is configured to perform the first operation
when the number of occupants detected by the occupant detection unit is one. And a lowfrequency speaker included in the second speaker set. Thereby, when riding alone, it is possible
to perform more realistic music reproduction.
[0013]
When the number of occupants detected by the occupant detection unit is two or more, the
control device detects a seat on which the occupant is seated by the occupant detection unit, and
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the second control unit is provided in the unseated seat. It is characterized by not outputting
from the speaker set of. Thus, the power consumption can be reduced.
[0014]
The second speaker set is characterized by comprising switching means for switching on and off
for each seat. As a result, power consumption can be reduced.
[0015]
The first speaker set may include a door speaker disposed at the door. Further, the second
speaker set may include speakers disposed at shoulders on both upper sides of the backrest
portion of the seat or headrest speakers disposed at both sides of the headrest.
[0016]
According to the present invention, in a vehicle-mounted acoustic system, a conventional door
speaker system and a seat speaker system can be combined to always provide high-quality sound
even when the number of occupants is different.
[0017]
{First embodiment} A first embodiment of the acoustic system according to the present invention
will be described with reference to the drawings.
FIG. 1 is a schematic diagram for explaining the configuration of the system, FIG. 2 is a diagram
for explaining the arrangement of speakers, and FIG. 3 is a flowchart for explaining the operation
according to the first embodiment.
[0018]
First, the schematic configuration of the system will be described using FIG. 1 and FIG. The
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control device 1 is connected to an audio device 2 and a boarding sensor 3 as an example of an
occupant detection means. Further, the sheet can be output to the door speaker system 5 as an
example of the first speaker set via the first audio signal processing device 4, and the sheet as an
example of the second speaker set via the second audio signal processing device 6 Output to the
speaker system 7 is possible.
[0019]
The control device 1 selects a speaker and an audio signal processing device to output according
to the state in the vehicle compartment, and the operation will be described later. The audio
device 2 is a vehicle-mounted sound source device, and includes a radio, a CD player, a TV, a DVD
player, a navigation system, and the like. The boarding sensor 3 is a sensor for detecting the
number or position of the occupant, and in the present embodiment, as shown in FIG. 2, pressure
sensors are provided on the seating surfaces of the respective seats.
[0020]
As shown in FIG. 2A, the door speaker system 5 is a first speaker set that is disposed in the
vehicle body and that outputs sound to the entire cabin space 81. The speaker configuration
includes, for example, a door speaker 51 embedded in the front door, a rear speaker 52 installed
at the rear of the vehicle interior, a woofer 53 for bass reproduction, and the like.
[0021]
The seat speaker system 7 is a second speaker set disposed in each seat, as shown in FIGS. 2 (a)
and 2 (b). The speaker configuration includes, for example, a shoulder-opening speaker 71
embedded in the shoulder of the seat 82, a bass embedded in the back of the seat, a woofer 72
for vibration reproduction, and the like. Headrest speakers arranged on both sides of the
headrest may be used instead of the shoulder opening speaker 71, and a center speaker may be
included to improve the front localization (the center speaker is not arranged in the target seat, It
will be placed in the instrument panel for the front seat, or behind the front seat for the back
seat).
[0022]
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In the present embodiment, the control device 1 can reproduce audio signals from all the
speakers at the same time or can reproduce them from individual speakers.
[0023]
The first and second audio signal processing devices 5 and 6 perform processing such as
frequency correction in order to add a sense of spread and a sense of reverberation.
The door speaker system 5 and the seat speaker system 7 have different speaker configurations,
such as the number of speakers and the distance from the speaker to the ear, so the content of
the signal processing is different.
[0024]
Various things can be adopted as contents of signal processing. The signal processing performed
by the first audio signal processing device 4 output from the door speaker system 5 in the
present embodiment is substantially optimized for the driver's seat. And since the distance from
the speaker on either side to a driver's seat differs, the process which delays the sound output
from the speaker by the side of a driver's seat can be considered. Further, processing is
performed to make the frequency characteristic flat.
[0025]
The signal processing performed by the second audio signal processing device 6 output from the
seat speaker system 7 is substantially optimized for each seat because each seat has a different
position in the cabin space 81. Although correction to flatten the frequency characteristic is
performed in the seat speaker system 7 as well, correction to improve the forward localization of
sound because the distance between the speaker and the ear is short, crosstalk cancellation
processing (from the left and right speakers to the opposite ear) It is possible to perform a
process of reducing an incoming sound, a reference process (a process of reproducing
reverberation in an audio room or the like, and adding a sense of sound spread).
[0026]
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FIG. 3 is a diagram for explaining the operation of the control device 1 according to the present
embodiment. When an instruction to start audio output is input from the passenger (S10), the
control device 1 first acquires information on the boarding sensor 3 (S11). The number of
passengers n ≦ 1 is determined from the obtained information (S12). When the number of
passengers n ≦ 1, it can be determined that only the driver's seat is on board (including the case
where no one is on board), so the control device 1 performs the first voice signal processing
device 4 The sound is output using the door speaker system 5 via (S13). As described above,
since the tuning of the door speaker system 5 is adjusted to be optimal at the driver's seat
position, the driver can listen to music with good sound quality.
[0027]
If it is determined in step S12 that the number of passengers n> 1, the control device 1 outputs a
sound using the seat speaker system 7 via the second audio signal processing device 6 (S14). As
described above, the tuning of the seat speaker system 7 is adjusted to be optimal for the driver's
seat and the seats of other passengers, so that all the passengers can listen to the music with
good sound quality. Also, it is possible to adjust the sound quality according to each individual's
preference without affecting other seats.
[0028]
Then, it is judged whether or not the audio output has ended (S15), and if the audio output has
ended, the routine is ended. Unless the process is ended, the process returns to step S11 to
perform loop processing for acquiring information on the boarding sensor 3. Therefore, when the
number of occupants changes during audio output, the speaker system to output can be changed
accordingly. At this time, if a sudden switching is performed, there is a possibility that the
passenger may feel a sense of incongruity, so it is preferable to fade out a system that does not
output and to switch while fading in.
[0029]
In the present embodiment, the boarding sensor 3 is described as a pressure sensor installed on
the seat surface of each seat. However, in the above configuration, there may be cases in which it
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responds to the load placed on the seat. Therefore, it is preferable to provide an ON / OFF switch
for each seat as an example of switching means for switching ON / OFF for each seat, or to
enable ON / OFF of each seat on the operation panel of the audio device. . Further, as a method of
acquiring the number of passengers, a mechanism for detecting the lock of the seat belt may be
used, or only the setting from the operation panel may be used. Such a method may be used.
[0030]
With the above-described configuration, in the sound system according to the present
embodiment, an appropriate speaker set can be automatically selected according to the situation
even if the number of occupants is different, and high-quality sound can always be obtained. Can
be provided. That is, when only the driver is on board, the door speaker system is used for
output, and a comfortable sound with a rich spatial spread can be provided. In addition, when
there is a passenger, it is possible to output using a seat speaker system to provide each person
with an optimally adjusted sound.
[0031]
{Second embodiment} A second embodiment of the acoustic system according to the present
invention will be described. FIG. 4 is a flow chart for explaining the operation according to the
second embodiment. The same reference numerals as in the first embodiment denote the same
parts as those in the first embodiment, and a description thereof will be omitted.
[0032]
In the first embodiment, the door speaker system 5 and the seat speaker system 7 are switched
to reproduce music. However, the door speaker system 5 and the seat speaker system 7 are not
completely distinguished from each other and are not mutually exclusive, and a further acoustic
effect can be obtained by partially combining them.
[0033]
Therefore, in the present embodiment, the speaker selection is performed as follows, instead of
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switching all the speaker systems. As shown in FIG. 4, when it is determined in step S12 that the
number of passengers n = 1, the control device 1 is connected not only to the door speaker
system 5 but also to the woofer 72 provided on the back of the seat of the seat speaker system 7.
And output using these (S20).
[0034]
Thereby, together with the spatial spread feeling using the door speaker system 5, it is possible
to obtain a realism by the bass and vibration of the seat speaker.
[0035]
{Third Embodiment} A third embodiment of the acoustic system according to the present
invention will be described.
FIG. 5 is a flow chart for explaining the operation according to the third embodiment. The same
reference numerals as in the first embodiment denote the same parts as in the first embodiment,
and a description thereof will be omitted.
[0036]
In the first embodiment, the speaker system is switched according to the number of passengers
to play music. However, it is also preferable to control not only the number of passengers but
also the position according to the riding position using the riding sensor 3. For example, even if
there are only one passenger, it may be possible to sit only in the front passenger seat and stop,
and even when two people are in the front passenger seat and in the rear seat, the sound
conditions may be different. It is because there is.
[0037]
Therefore, as shown in FIG. 5, when the information from the boarding sensor 3 is acquired in
step S11, it is determined whether the boarding sensor 3 for only the driver's seat is ON (S30),
and in the case of YES the door Audio is output from the speaker system 5 (S13). In other cases,
the control device 1 is connected to the seat speaker system 7 and outputs only from the seat for
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which the boarding sensor 3 is ON (S31). For example, when only the driver's seat and the front
passenger seat are on, the seat speaker system for the driver's seat and the front passenger seat
is enabled, and the seat speaker system for the rear seat is disabled. Further, for example, when
only the driver's seat and the rear seat left are on, the seat speaker system for the driver's seat
and the rear seat left is enabled, and the passenger seat and the seat speaker system for the rear
seat right are disabled.
[0038]
As described above, when a plurality of people are on board, power consumption can be reduced
by enabling only the seat speaker system at the boarding position.
[0039]
The present invention can be used as an acoustic system mounted on a vehicle.
[0040]
It is a schematic diagram explaining composition of a system.
It is a figure explaining arrangement of a speaker.
It is a flowchart explaining the operation | movement which concerns on 1st Example. It is a
flowchart explaining the operation | movement which concerns on 2nd Example. It is a flowchart
explaining the operation | movement which concerns on 3rd Example.
Explanation of sign
[0041]
DESCRIPTION OF SYMBOLS 1 ... Control device 2 ... Audio device 3 ... Ride sensor 4 ... 1st voice
signal processing device 5 ... Door speaker system 6 ... 2nd voice signal processing device 7 ...
Seat speaker system 51 ... Door speaker 52 ... Rear speaker 53 ... Woofer 71 ... Speaker speaker
72 ... Woofer 81 ... Cabin space 82 ... Seat
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