JP2005051324

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DESCRIPTION JP2005051324
The present invention has a front speaker attached to the lower part of a front door of a
passenger car and a speaker attached to the ceiling of a passenger compartment, and a listener
of any seat in the passenger compartment similarly senses the sound spreading. Provided is a
speaker device capable of obtaining a sense of ascent of a sound image. A front speaker FSP and
a ceiling mounted speaker HSP are disposed at positions mutually separated in the vertical
direction with respect to listeners M1 and M2 in a vehicle compartment. The time delay is
performed for the sound output from the ceiling-mounted speaker, which is the one with a
shorter distance to the listener, and when the listeners M1 and M2 listen to the sound from the
speakers FSP and HSP, the delay time is Among the arrival time differences of the sound from
each speaker in each of the listeners, it is set based on the longest arrival time difference.
Furthermore, when the delay time is set long, a sense of forward localization of the sound image
for the listener M1 is secured. [Selected figure] Figure 1
Speaker device
[0001] The present invention relates to a loudspeaker apparatus in which the auditory sensation
is corrected for a plurality of loudspeakers vertically arranged to a listener, and in particular, to a
loudspeaker directly mounted on a front loudspeaker and a ceiling plate of a vehicle. A plurality
of speakers including an on-vehicle speaker are arranged to improve the listener's sense of
expansion and to raise the sound image, and further, a speaker capable of stereo reproduction
with the auditory feeling corrected in the front or rear seat of the vehicle interior It relates to the
device. 2. Description of the Related Art Conventionally, a speaker device has been used to
perform sound reproduction of music and voice in the interior of a vehicle, for example, a
passenger car. The speaker device is embedded, for example, as a front speaker in a door for a
front seat, or is mounted on a rear tray as a rear speaker. It is usual that a speaker apparatus
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including the plurality of speakers is set, attached and arranged to correspond to at least one of
the front seat and the rear seat in terms of hearing. In the vehicle interior of the car, the left
channel speaker for stereo signals is attached to the left end of the front panel in front of the
cabin and the right channel speaker is attached to the right end thereof. It is arranged. For
example, in the driver's seat, the right speaker is closer and the left speaker is farther. In this
case, the sound wave of the right speaker reaches the driver more quickly, and on the original
stereo reproduction, the sound image is localized to the right while being localized to the front. In
order to solve this, processing for delaying the signal of the right speaker and causing it to arrive
at the same time as the signal of the left speaker is known. However, since the vehicle interior is
a sealed narrow space, reflection occurs in a short time, and the sound waves interfere with each
other, and the transfer characteristic to the listening position becomes very complicated. In
addition, since the music is listened to at an asymmetrical position with respect to the speaker
arrangement, the transfer characteristics from the left and right speakers are greatly different.
Various proposals have been made to improve the acoustic characteristics in the passenger
compartment by removing the adverse effect of such stereo reproduction in the passenger
compartment. In a stereo reproduction apparatus in which left and right front speakers and left
and right rear speakers are disposed in a vehicle compartment, a band pass filter having a low
order band cut-off characteristic and a delay processing unit are connected in series to obtain a
high order band cut-off characteristic. To be added to the band-pass filter, so that even if the
voice band signal is localized, the delay amplitude characteristic is kept flat and the sound image
of the voice band is localized to the front of the occupant in the vehicle interior where the
speaker position is biased. Has been proposed (see, for example, Patent Document 1).
Further, in the on-vehicle audio system, in addition to the speakers, microphones are provided,
and delaying means are used to make the timings of the sounds from the speakers reaching the
microphones substantially coincide with each other. In order to reduce the sense of discomfort
and improve the sound quality (for example, see Patent Document 2). Further, although the
volume, output delay time, etc. of a plurality of speakers disposed around the vehicle cabin of the
vehicle are appropriately set to form an optimum sound field in the vehicle, Can not form an
optimal sound field. Therefore, a speaker set for sound field correction consisting of four
speakers facing in four directions is arranged on a ceiling or the like in the center of the
passenger compartment, and a total of eight speakers are provided together with the
surrounding four speakers. There is known an audio system in which independent filters in
which a volume ratio and an audio output timing are adjusted are respectively connected to
output a sound (see, for example, Patent Document 3). This audio system is capable of forming
an optimal sound field for each of the four seats in the vehicle compartment. The filter of each
speaker is set in advance according to the mute mode of the four speakers arranged around, and
when the mute is detected, the filter is selected so that the sound field at other positions is not
changed . Therefore, it becomes possible to form an optimal sound field at each of a plurality of
positions in the vehicle compartment, and to listen to the audio in the optimum sound field
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individually for all persons sitting in the vehicle interior. For example, one person can listen to
the audio at the same optimal sound field whether sitting on the right side or the left side in the
rear seat. Furthermore, in order to form a better sound field having sufficient deep bass in the
vehicle interior, in addition to disposing the speaker device involved in sound reproduction in the
door for the front seat or on the rear tray, the ceiling of the vehicle interior It has been proposed
to arrange a speaker device also in a part (see, for example, Patent Document 4). In the proposed
speaker device, when the normal speaker device is mounted in the vehicle compartment, the
mounting position of the speaker device is restricted, and so the speaker device having a very
large aperture can not be used. In the above proposal, instead of the speaker device having a
large aperture, a vibration device directly attached to the ceiling plate is used to form a speaker
in which a portion of the ceiling plate is a diaphragm. ing.
In the prior art, the inside of the door or the trunk room is used as an enclosure for the effect of
the deep bass possessed by the speaker device having a large aperture, and the bass resonance is
enhanced by the resonance of the enclosure. Furthermore, in other prior art, so-called digital
signal processors are used to perform signal processing so as to enhance deep bass. However, in
these conventional techniques, it is difficult to sufficiently compensate for the lack of deep bass
due to the aperture of the speaker. In addition, the distance between the speaker device
embedded in the door and the speaker device placed on the rear tray differs significantly from
the distance between the listener seated on the front seat and the rear seat, and the balance of
the sound field is balanced. There is a problem that it is broken down. Furthermore, in particular,
from the speaker device embedded in the door, the sound is emitted from the lower side of the
listening position, and there is a problem that the sound effective for the localization of the sound
image is not sufficient. Sound reproduction is impossible. Therefore, in the on-vehicle speaker
device proposed in Patent Document 4, in consideration of these problems, at least a part of a
ceiling plate of a passenger car is used as a diaphragm, and at least a bass region is reproduced.
The speaker body is mounted so that its opening faces the passenger compartment side of the
passenger car. Thus, the bass range can be reproduced, and the presence of the sound field can
be enhanced by installing the speaker device in the ceiling portion, and a better vehicle interior
sound field can be formed. As described above, when stereo reproduction is performed by a
plurality of speakers arranged in a limited space such as a vehicle interior, the acoustic
characteristics in the vehicle interior are improved, and the respective seats in the vehicle
interior are most suitable. Various measures are known that can create a sound field. [Patent
Document 1] Japanese Patent Application Laid-Open No. 6-141400 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2001-236077 [Patent Document 3] Japanese Patent
Application Laid-Open No. 2001-286000 [Patent Document 4] Japanese Utility Model
Application Publication No. 6-45865 By the way, in the stereo reproduction apparatus proposed
in Patent Document 1, when the speaker position is biased in the horizontal direction with
respect to the driver, the sound image of the voice band is driven. In the in-vehicle audio system
proposed in Patent Document 2, the frequency characteristics of the sound pressure level and
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the group delay time characteristics are obtained in accordance with the listening position to
improve the sound quality. It is said that.
Then, in the audio system proposed in Patent Document 3, eight speakers are selected including
the speaker set for sound field correction so that an optimum sound field at a plurality of
positions can be formed. In each of the speaker devices according to the proposed techniques,
the left and right front speakers are attached to the front panel portion or the like in the vehicle
compartment, and their arrangement level is close to the listener's listening position. The sound
image by the output from the left and right speakers is formed to a certain extent in front of the
listener, and it is unlikely that the sense of incongruity will be felt in relation to the position of
the sound image. On the other hand, as in the speaker device described in Patent Document 4,
when the left and right front speakers are attached to the lower side of the front door related to
the inside of the vehicle compartment, Even if the technology for forming and improving the
sound quality is applied, the left and right front speakers are located below the listening position
of the listener, so even if good stereo reproduction is possible by the left and right front speakers,
The sound image by these becomes a position below the listening position of a listener, and there
exists a problem that the realism of audio reproduction is impaired. Furthermore, in the speaker
device proposed in Patent Document 4, front speakers are attached to the lower portions of the
left and right front doors, respectively, and further, a speaker mounted directly on a ceiling for
heavy bass is mounted on the ceiling portion of the vehicle. Although provided, this speaker
device is intended to improve the sense of realism by adding a speaker for deep bass, and the
position of the sound image by the front speakers on the left and right can be listened to by the
listener from below. It does not raise to the front of the position. Further, the techniques
proposed in the respective patent documents require a complicated setting circuit, many
speakers, etc. in order to form an optimum sound field at a plurality of positions in the vehicle
cabin, which leads to an increase in cost. Do. In addition, it is necessary to set according to each
listening position, and the listener is forced to perform complicated operations, which causes a
problem of taking time and effort. Therefore, according to the present invention, a speaker device
in which a front speaker and a speaker attached to a ceiling of the room are separately divided
upward and downward to form a stereo reproduction space in a vehicle or the like. By delaying
the sound output of the speaker attached to the ceiling with respect to the sound output of the
front speaker by a predetermined time, the sense of loudness is improved and the position of the
sound image perceived by the listener is raised. It is an object of the present invention to provide
a speaker device in which the same effect can be obtained at any listening position in a room.
In order to solve the above problems, according to the present invention, a first speaker and a
second speaker mounted at mutually separated positions in the vertical direction, and the first
speaker from the first speaker The speaker device having a drive control unit for outputting one
sound and outputting the second sound from the second speaker, wherein the drive control unit
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is configured to control the first speaker or the second speaker in a direction in which the
distance to the listener is short. A predetermined time delay is performed on the first sound or
the second sound output from the speaker. And, when the first speaker or the second speaker is
positioned on the opposite side of the second speaker or the first speaker with respect to the
listener, the drive control unit may perform the second sound. Alternatively, when the time delay
for the first sound is made longer than the predetermined time delay by a predetermined length,
and the plurality of listeners listen to the first sound and the second sound, the predetermined
delay time , Of the arrival time differences of the first sound and the second sound in each of the
listeners, it is set based on the longest arrival time difference. Furthermore, each of the first
speaker and the second speaker includes a plurality of stereo-configured speakers, and the first
speaker is attached to a lower portion of each of the front doors of the vehicle room. The second
speaker is attached to a ceiling of the vehicle, or the first speaker includes a speaker attached to
a rear part in the room. Further, each of the speakers constituting the second speaker has a
vibration device to which a stereo signal is supplied, and each of the vibration devices is spaced
apart from each other by a flat portion of a ceiling plate of the ceiling portion. Directly attached,
and a part of the ceiling plate is used as a diaphragm of the speaker, and the drive control unit
relates to the first sound and the second sound corresponding to a plurality of seats in the
vehicle compartment. The arrival time difference information is held, and the predetermined
delay time is set based on the selected sound arrival time difference. Then, the drive control unit
is configured to delay the predetermined time based on the longest arrival time difference among
the arrival time differences of the first sound and the second sound corresponding to a plurality
of seats in the vehicle compartment. Is set and the second speaker outputs the second sound
delayed by the predetermined time from the second speaker, and the drive control unit further
delays the time delay with respect to the second sound by the predetermined time. Further, the
second sound set to be longer by a predetermined length and output from the second speaker is
subjected to the time delay.
BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a speaker device
according to the present invention will be described with reference to the drawings. Here, taking
the case where the speaker device of the present embodiment is applied to a cabin of a vehicle or
the like as an example, it is described that the sound image is raised by the arrangement of the
plurality of speakers. Of the speakers, a part of the speakers is a space or a room that must be
arranged below the listener's listening position in order to form a stereo reproduction space in
which the sound image is raised, and the listener In the case where it is necessary to attach
another speaker above the listening position, the speaker device of the present embodiment can
be applied without being limited to the vehicle compartment such as a vehicle. In recent
passenger cars and the like, as disclosed in Patent Document 4, the front speaker is often
attached to the lower part of the front door. And in the speaker apparatus of this embodiment,
the speaker mounted on the ceiling part is required because the speaker part is required also to
the ceiling part of the vehicle room above the front speaker located below to raise the sound
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image. However, in consideration of not being in the way, it is decided to adopt the direct ceiling
mounted speaker disclosed in Patent Document 4. The speaker device described in Patent
Document 4 will be described with reference to FIG. 4 and FIG. FIG. 4 shows a partial longitudinal
sectional view of a passenger car, showing a state in which the direct ceiling mounted speaker is
incorporated into the passenger car. A front seat 3 including a driver's seat and a rear seat 4 are
provided in a passenger compartment of the passenger car 1. A front speaker 6 is embedded in
the lower part of the front door for the front seat 3, and a rear speaker 7 is mounted on the rear
tray of the rear seat 4. The ceiling portion of the passenger car 1 is composed of an outer plate 2
and a ceiling plate 5, and a vibration device 8 described later is attached near the center of the
ceiling plate 5 to constitute a speaker device. FIG. 5 shows that the vibration device 8 is directly
attached to the ceiling plate 5 and a speaker is configured, and an enlarged cross-sectional view
of the vicinity of the attached vibration device 8 is shown. In the vibrating device 8, an external
magnet type magnetic circuit is formed by sandwiching the annular magnet 85 between the plate
84 and the base plate of the pole piece 86. A voice coil 82 is provided in the gap between the
pole piece 86 forming the magnetic circuit and the plate 14. The voice coil 82 is wound around a
bobbin 81, and a pedestal portion of the bobbin 81 is fixed to the ceiling plate 5.
A damper 83 attached to the plate 84 is fixed to the pedestal of the bobbin 81. The ceiling plate
5 itself plays the role of a diaphragm. Therefore, when an alternating current signal is applied to
the voice coil 82, the ceiling plate 5 connected to the bobbin 81 wound with the voice coil 82 can
be vibrated to generate a sound according to the alternating current signal. The vibration device
8 may be attached between the outer plate 2 and the ceiling plate 5, but as indicated by a broken
line in FIG. Is obtained. However, the direct ceiling mounted speaker described in Patent
Document 4 is used as a loudspeaker for reproducing a high-pitched sound, since a large
diaphragm area can be secured by using the ceiling plate 5 as a diaphragm. If the two vibration
devices are attached to the ceiling plate of the vehicle at a predetermined distance from one
another and stereo signals are supplied to each of the vibration devices, the ceiling plate in the
attachment portion of the vibration device is directly driven. It has been confirmed that a stereo
speaker device can be formed. The predetermined interval is set so that a listener sitting in a seat
in the vehicle compartment can obtain a sense of stereo. In the case of a passenger car, the
distance is about 80 to 120 cm. In addition, since the vibration device is directly attached to the
ceiling plate and a part of the ceiling plate is used as a diaphragm, the direct ceiling mounted
speaker needs to be attached to the flat portion of the ceiling plate. Usually, in the ceiling plate of
a passenger car, there is a sudden change in the ceiling plate for the purpose of being
incorporated into the ceiling. Therefore, when the vibration device of the direct ceiling speaker is
attached to the ceiling plate, the attachment position is a flat portion of the ceiling plate avoiding
this sudden change portion which does not function as a diaphragm. Therefore, in the stereo
device according to the present embodiment, the rear speaker mounted on the rear portion of the
passenger compartment shown in FIG. 4 is required to be mounted at the upper position with
respect to the front speaker located below the listening position. Instead of the above, it was
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decided to adopt the above-mentioned direct ceiling mounted speaker as a rear speaker. Here,
since it is assumed that the stereo device is applied to the interior of a vehicle or the like, a direct
ceiling mounted speaker is convenient as a rear speaker, but it is in a space or room other than a
vehicle cabin or the like. In the case of application, if the ceiling plate is installed, the direct
ceiling mounted speaker can be used, but if the ceiling plate is not installed, a normal speaker
can be attached above to be a rear speaker .
Next, by attaching the direct-to-ceiling speaker to the ceiling plate of a car, it is possible to
improve the sense of loudness of the sound in the vehicle compartment and to increase the
sound image formed by the front speaker. . However, in general, in a passenger car or the like, in
addition to the driver's seat, a seat for a passenger is provided, and as shown in FIG. 4, a front
seat and a rear seat are provided. Therefore, depending on the mounting position of the direct
ceiling speaker mounted on the ceiling portion of the vehicle interior, there is a problem that the
effect of improving the sense of sound spreading and raising the sound image can not be
similarly obtained in both the front and rear seats. Therefore, this problem will be described with
reference to FIG. 6 and FIG. FIG. 6 shows the case where the mounting position of the direct
ceiling speaker is closer to the listener at the front seat, and FIG. 7 shows the case where the
mounting position of the direct ceiling speaker is closer to the listener at the rear seat . In FIG. 6,
the direct ceiling mounted speaker HSP is attached to a ceiling plate at a position near the
listener M2 at the rear seat and far from the listener M1 at the front seat. Therefore, in this case,
the effects of the improvement of the sound spread and the rise of the sound image are
emphasized in the front seat. On the other hand, for the listener M2 on the rear seat, the sound
from the ceiling-mounted speaker HSP becomes a dominant feeling. This is because the distance
b21 between the listener M2 and the direct ceiling mounted speaker HSP is too close to the
distance A2 between the front speaker FSP and the listening position of the listener M2. On the
other hand, in FIG. 7, the direct-to-ceiling speaker HSP is attached to the ceiling plate at a
position close to the listener M1 at the front seat and at a distance from the listener M2 at the
rear seat. Therefore, in this case, the effects of the improvement of the sound spread and the rise
of the sound image are emphasized in the rear seat. However, for the listener M1 on the front
seat, the sound from the ceiling-mounted speaker HSP becomes a dominant feeling. This is
because the distance b12 between the listener M1 and the direct ceiling mounted speaker HSP is
too close to the distance A1 between the front speaker FSP and the listening position of the
listener M1. Thus, depending on the mounting position of the direct ceiling mounted speaker
HSP, the audibility in the front seat or the rear seat is not the same. Furthermore, for the listener
M2 in the rear seat, in either case of FIG. 6 or FIG. 7, since the ceiling direct attachment speaker
HSP is located in front of the listener M2, the sound image by the front speaker FSP and the
ceiling direct attachment speaker HSP Is positioned in front of the listener M2, and is in a state
where a relatively satisfactory stereo feeling can be secured.
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On the other hand, for the listener M1, in either of FIG. 6 or FIG. 7, the attachment position of the
direct ceiling mounted speaker HSP is behind the listener M1, so the front speaker FSP and the
direct ceiling mounted speaker HSP The sound image is localized above the listener M1, and even
if the sound spread is obtained, it is not possible to secure a sound field satisfying the stereo
feeling. Therefore, in order for both the listener M 1 and the listener M 2 to obtain the same
effect on all of the sense of sound spread, sense of rise of the sound image, and forward
localization of the sound image, When the speaker FSP is attached to the lower part of the front
door, the direct ceiling speaker HSP needs to be attached to the ceiling above the front speaker
FSP. However, the ceiling of a normal passenger car only covers at least the upper part of the
front seat and the rear seat, and when the ceiling direct attachment speaker HSP is to be
attached, the ceiling direct attachment is required due to the setting of the sunroof, etc. There is
originally no ceiling to which the attached speaker HSP should be attached. In addition,
depending on the structure of the passenger car, this ceiling board may extend forward from the
front seat, but even if the ceiling-mounted speaker HSP is attached here, the sound image is from
the rear seat It will be far away and the listeners of the rear seats will feel less powerful. In this
case, the listener on the rear seat loses the meaning of being attached with the ceiling mounted
speaker HSP. Therefore, the range in which the direct ceiling mounted speaker HSP is attached to
the ceiling of the passenger car is limited, and when the direct ceiling mounted speaker HSP is
attached to the ceiling, as shown in FIGS. 6 and 7, In the front speaker FSP attached to the lower
part of the front door and the ceiling direct mount speaker HSP, the sense of loudness, the sense
of rise of the sound image, and the front of the sound image for both the listener M1 and the
listener M2. It is difficult to obtain the same effect for all of the localization. Therefore, in the
speaker apparatus according to the present embodiment, when performing stereo reproduction
by the front speaker FSP attached to the lower part of the front door and the ceiling mounted
speaker HSP, listening to the front seat using the hearth effect By adjusting the time of arrival of
the sound between the person M1 and the listener M2 in the rear seat, even if the situation is as
described above, the sense of loudness, the feeling of rising of the sound image, and both The
same effect was obtained for all forward localization of the sound image.
Therefore, by adjusting the arrival time of the sound to the listener, the front seat and the rear
seat both have the same sense of sound spreading, sound image rising, and forward localization
of the sound image. The principle of auditory sense correction in which the effect of (1) is
obtained will be described with reference to FIG. The front speaker FSP is located below the front
door and is located below the listener M1, and the ceiling mounted speaker HSP is attached to
the central part of the ceiling of a passenger car, which is an optimum location for mounting. It
shall be. The hearth effect (preceding sound effect) is that when a plurality of sound sources
exist, when the same sound from each sound source reaches the listener's ear, the sound image is
localized in the direction of the sound that first reached that ear It is said that this phenomenon
occurs when the time difference of the arrival sound from each sound source is 1 to 30 ms. In
the present embodiment, when the speakers and the listener are arranged as shown in FIG. 1, the
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sound output of the ceiling mounted speaker HSP is compared with the sound output from the
front speaker FSP by using the hearth effect. The delay time for the predetermined time is used
to adjust the arrival time of the sound to the listener. For example, when looking at the listener M
1, since the ceiling direct attachment speaker HSP is positioned behind the front speaker FSP, a
sense of sound spread and a sense of rise of the sound image can be obtained. Since the sense of
forward localization for the listener M1 is lost, the sound output of the ceiling-mounted speaker
HSP is delayed for a predetermined time with respect to the sound output from the front speaker
FSP. Then, for the listener M1, the same effect is obtained as the apparent position of the direct
ceiling mounted speaker HSP becomes farther than the position of the front speaker FSP.
Therefore, for the listener M1, the sound from the front speaker FSP comes first, and the sound
from the direct ceiling speaker HSP arrives first, so that a sense of forward localization can be
secured. Further, in order to obtain the same effect for both the front seat listener M1 and the
rear seat listener M2, the arrival conditions of the sound for the listener M1 and the listener M2
are the same. It needs to be there. As shown in FIG. 1, the distances between the front speaker
FSP of the listener M1 and the ceiling mounted speaker HSP are A1 and B1, and the distances
between the front speaker FSP of the listener M2 and the ceiling mounted speaker HSP are A2
and B2. Then, to make the arrival condition of the sound to the listener M1 and the listener M2
the same, if it is to be realized by the arrangement of each speaker, the relationship of (A1-B1) =
(A2-B2) is satisfied. It means to let it go.
However, the arrangement of speakers satisfying this relationship is often difficult as described
above. Therefore, as described above, by delaying the sound output from the speaker with
respect to the sound output from the other speakers, utilizing the fact that it is equivalent to
changing the apparent distance, the listener M1 and It is sufficient to set the delay time for the
sound output of the direct ceiling mounted speaker HSP to the sound output of the front speaker
FSP so that the arrival time difference of the sound with the listener M2 is the same. Thus, not
only the same effect can be obtained for both the listener M1 and the listener M2 by the delay
adjustment of the sound output, but even in the case of the arrangement of the loudspeakers
shown in FIG. When determining the mounting position of the direct ceiling speaker, it is possible
to select the optimum location in consideration of the speaker characteristics in the ceiling of the
passenger car regardless of the listener's sense of sight. Since the on-hook speaker HSP is
relatively close to the position, a powerful feeling of sound can be obtained. Next, a schematic
block configuration of the speaker device of the present embodiment according to the speaker
arrangement shown in FIG. 1 is shown in FIG. The configuration of the speaker device shown in
the figure is an example of a small passenger car. As a speaker device incorporated in the small
passenger car, left and right front speakers FSP-L and FSP-R provided at the lower part of the left
and right front doors of the passenger car are attached to the ceiling and two as rear speakers
Direct ceiling mounted speakers HSP-L and HSP-R are connected. A sound source unit 11, a
signal processing control unit 12, an output unit 14, an operation unit 16, and a display 16 are
provided as speaker devices for driving these speakers. The sound source unit 11 includes a tape
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cassette player, a CD or MD reproduction player, a DVD reproduction player, etc. The sound
source unit 11 supplies a music signal or an audio signal from the sound source selected by the
signal processing control unit 12 Do. The operation unit 15 selects a sound source in the sound
source unit 11 and sets reproduction conditions of the sound, and further selects or sets an
acoustic environment in the vehicle compartment such as an output state related to each speaker
be able to. The signal processing control unit 12 controls the entire speaker device, and performs
processing such as demodulation on the music signal or the audio signal transmitted from the
sound source unit 11 in accordance with the conditions input from the operation unit 15.
Execute and output sound from each speaker through the output unit 14 and share with the
other images, for example, the type of sound source, the output state of each speaker, the
audibility state concerning each seat in the vehicle compartment, etc. To display.
Furthermore, the signal processing control unit 12 includes the delay unit 13 therein, and the
ceiling is directly attached to the music signal or the audio signal supplied from the sound source
unit 11 according to the selected acoustic environment in the vehicle compartment. The sound
output to the speakers HSP-L and HSP-R is given a predetermined time delay. The amount of
delay time may be set in advance as an optimum value for each car model of a passenger car, and
the operation unit 15 may be configured to allow the user to select on / off of the time delay.
Also, the delay amount may be selected according to the type of sound source or may be variable
according to the preference of the user. Although the configuration example of the speaker
device shown in FIG. 2 is a case of a small passenger car, a rear speaker may be used when the
compartment is wider than a small passenger car, such as a sedan type passenger car or a onebox car. In addition to direct ceiling mounted speakers, speakers can also be placed on the rear
door. Even in this case, by giving a time delay to the sound output of the ceiling mounted
speaker, the same effect can be obtained over the entire seat in the vehicle compartment. Next, in
the speaker apparatus of the present embodiment having the configuration shown in FIG. 2, a
time delay is added to the sound output of the ceiling-mounted speakers HSP-L and HSP-R, as
shown in FIG. It explains, referring to. In FIG. 3, the illustration is simplified and schematically
shown so that the positional relationship between each speaker and the listener is clear, and
therefore, they do not match the actual dimensions. In FIG. 3, the listener M1 is the driver of the
small passenger car and sits in the driver's seat of the front seat, and the listener M2 is on the
right side of the rear seat, ie, just behind the driver's seat Each sitting position is shown by a
black circle. In the figure, the state as viewed from one side is shown, and the front speaker FSR
and the ceiling mounted speaker HSP are shown as FSP-R and HSP-R on the right side, but in fact,
FSP- on the left side is shown. Although L and HSP-L are provided, when viewed from one side,
since they overlap, display of FSP-L and HSP-L on the left is omitted to simplify the illustration.
Here, the distances from the listening position of the listener M1 to the front speaker FSP-R and
the ceiling mounted speaker HSP-R are respectively A1 and B11, and from the listening position
of the listener M2 to the front speaker FSP-R Assuming that the distances to the ceiling-mounted
speaker HSP-R are A2 and B21, respectively, in the small passenger car, the actual measurement
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distances thereof are as follows.
<img class = "EMIRef" id = "198897329-000003" /> By the way, as described above, the
mounting position of the ceiling mounted speaker which can obtain the same effect between the
front seat and the rear seat is as described above. The relationship (A1-B1) = (A2-B2) should be
satisfied. That is, assuming that a directly mounted ceiling speaker mounted at an ideal position
is VSP-R, the position is as shown by a broken line in FIG. According to this position, the
relationship of (A1-B10) = (A2-B20) is satisfied. In practice, however, since the direct ceiling
mounted speaker HSP-R can not be attached to the position of the broken line, the distance X
from the ideal direct ceiling mounted speaker VSP-R at the ceiling of the passenger car The
ceiling direct mount speaker HSP-R will be attached at the shifted position. In the case of the
small-sized passenger car, in order to secure the force between the rear seats, the position was
set as the optimum position with a distance X = 200 (mm). At this time, the head of the listener
M1 is near the middle point of the distance X, and the actual measurement distances thereof are
as follows. <img class = "EMIRef" id = "198897329-00004" /> According to the ideal position
shown by the broken line in FIG. 3, A1-B10 = 645 (mm) A2-B20 = 645 (mm) However, due to the
distance X, according to the measured distance, A1-B11 = 625 (mm) A2-B21 = 870 (mm) In the
ceiling-mounted speaker HSP-R mounting position, the front seat and the rear are attached It
turns out that the same effect can not be obtained with the seat. Therefore, when measuring the
impulse rise time of the sound output from the front speakers FSP-L and FSP-R and the ceiling
mounted speakers HSP-L and HSP-R at each listening position of the listeners M1 and M2, The
following is true for the listener M1, <img class = "EMIRef" id = "198897329-000005" /> The
following is true for the listener M2. <img class = "EMIRef" id = "198897329-000006" /> Based
on these measurement results, the arrival time difference of sound between the front speaker
FSP and the ceiling mounted speaker HSP at the listener's listening position is determined And
<img class = "EMIRef" id = "198897329-00007" /> for the right channel and the left channel for
the listener M1, and <img class = for the right channel and the left channel for the listener M1. It
becomes "EMIRef" id = "198897329-00008" />.
Therefore, for example, considering the hearing by the freon for the listener M1, the speaker
FSP-R, and the ceiling mounted speaker HSP-R, the sound of the ceiling mounted speaker HSP-R
can be obtained by referring to the above time difference. By delaying the output with respect to
the sound output of the front speaker FSP-R by 1.81 ms, at the listening position of the listener
M1, the sound of the sound by the freon, the speaker FSP-R and the ceiling direct mount speaker
HSP-R It is possible to obtain a sense of spread and a sense of rise in the sound image. However,
even if the delay time of the sound output of the ceiling-mounted speakers HSP-R and HSP-L is
set to 1.81 ms, the listening positions of all the seats can be understood as seen from the time
difference result described above. In the above, it is not possible to obtain the same sense of
expansion and the sense of elevation of the sound image. Therefore, in order to obtain the same
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sense of expansion and the sense of elevation of the sound image at the listening positions of all
the seats, the arrival time difference of the sound determined above, (right FSP)-(right HSP) =
1.81. , (Left FSP)-(left HSP) = 1.56, (right FSP)-(right HSP) = 2.87, (left FSP)-(left HSP) = 2.71 all
times the ceiling The delay time of the sound output of the directly attached speakers HSP-R and
HSP-L may be set. For example, it can be 3 ms. As described above, assuming that the delay time
of the sound output of the ceiling mounted speakers HSP-R and HSP-L is set to 3 ms for the delay
unit 13 provided in the signal processing control unit 12, The same effect, that is, the sound
spreading and the sound image rising can be obtained at the listening positions of all the seats in
the vehicle compartment. However, when the delay time of 3 ms is set, for the listener sitting in
the front seat, the ceiling mounted speaker HSP-L or HSP-R will be positioned behind, so the
front seat At the listening position, although the sense of sound spread and the sense of rise of
the sound image can be obtained, the sense of front localization of the sound is lacking.
Therefore, the delay time of the sound output of the ceiling mounted speakers HSP-R and HSP-L,
for example, the arrival time of the sound from the front speaker FSP-L located farthest from the
listening position of the listener M1 As a reference, if it is set to 6 ms, which is a double of 3 ms,
the sense of sound spread and sound image increase in all seats can be obtained, and for
listeners in the front seat, the sense of forward localization of sound can be ensured. . In this
case, for listeners in the rear seat, since the ceiling-mounted speakers HSP-L and HSP-R are
located close to each other, the powerful feeling of sound remains secured.
In the above embodiment, the case of the distance X = 200 (ms) is shown, but the size of the
distance X is not necessarily fixed to this, and an appropriate distance to the ceiling is The sound
output from the direct ceiling speaker may be delayed based on the arrival time difference
obtained by measuring the impulse rise time from each speaker at the listening position in a
plurality of seats according to the mounting position. In the above embodiment, among the
arrival time differences determined corresponding to the listening positions of a plurality of
seats, the longest arrival time difference is set as the predetermined time delay in the delay unit
of the signal processing control unit. However, a plurality of arrival time differences determined
corresponding to the plurality of seats are held in the control unit as sound arrival time
difference information, and the arrival time differences are selected as necessary, and set as a
predetermined time delay. You can also In the above-described embodiment, the present
invention is applied to a vehicle such as a passenger car, and since it is mounted in a vehicle
interior with a vertical relationship, a direct ceiling mounted speaker is adopted as a rear
speaker. Not limited to, a normal flat speaker etc. can also be used. In the above, the speaker
device of the present embodiment has been described focusing on a vehicle such as a passenger
car. However, the speaker device of the present embodiment is not limited to the vehicle interior
of the vehicle, and a plurality of speakers are ideal. It is also applicable to a room that can not be
attached by arrangement, and a time delay is added to the sound output from the selected
speaker, and the arrival time at the listening position is adjusted, so that the sound spreads and
the sound image rises The feeling and the forward localization of the sound can be secured. By
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changing the amount of time delay to be applied, it is possible to adjust the feeling of forward
localization. As described above, according to the present invention, in the speaker apparatus
having a plurality of speakers mounted at positions separated from each other in the vertical
direction, the speaker output from the speaker having a shorter distance to the listener For a
predetermined time delay, and when the speaker is located on the opposite side of the other
speaker to the listener, a time delay for the sound from the oppositely located speaker Since the
delay time is made longer by the predetermined length than the predetermined time delay, the
sense of the sound spreading, the feeling of rising of the sound image, and the sense of forward
localization of the sound image are secured for the listener. In addition, when a plurality of
listeners listens to sounds from a plurality of speakers, the predetermined delay time is the
longest reaching time among arrival time differences of sounds from the respective speakers in
each of the listeners. Since the setting is made based on the time difference, the sense of sound
spread, the sense of rise of the sound image, and the sense of forward localization of the sound
image are secured similarly in any of the plurality of listeners.
<Brief Explanation of Drawings> <Figure 1> It is the figure which explains the auditory sense
revision principle in the on-vehicle speaker device of this invention. FIG. 2 is a diagram for
explaining a schematic block configuration relating to an on-vehicle stereo speaker device of the
present invention. FIG. 3 is a view for explaining a state in which auditory sense correction is
performed to obtain the same effect in front and rear seats in the on-vehicle stereo speaker
device of the present invention. FIG. 4 is a view for explaining a state in which a conventional invehicle speaker device is attached to a ceiling interior plate of a vehicle. FIG. 5 is a view showing
a longitudinal section of a conventional in-vehicle speaker device. FIG. 6 is a view for explaining a
state in which a direct ceiling mounted speaker is disposed on the front seat side. FIG. 7 is a view
for explaining a state in which a direct ceiling mounted speaker is disposed on the rear seat side.
[Description of the code] 1 vehicle 2 outer plate 3 front seat 4 rear seat 5 ceiling plate 6 front
speaker 7 rear speaker 8 8L, 8R vibration device 11 sound source unit 12 signal processing
control Part 13 ... delay part 14 ... output part 15 ... operation part 16 ... indicator 81 ... bobbin 82
... voice coil 83 ... damper 84 ... plate 85 ... annular magnet 86 ... pole piece FSP ... front speaker
HSP ... ceiling direct mounted speaker M1 ... Front seat listener M2 ... Rear seat listener
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