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JP2009045302

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DESCRIPTION JP2009045302
The present invention provides a speaker device capable of forming a more comfortable acoustic
space for each user based on the change of the position of the ear for each user sitting on a seat.
A speaker device is provided in a seat body and has a variable direction, a speaker direction
adjusting means for adjusting the direction of the speaker, and a position detection means for
detecting a position of a headrest of the seat body. And control means for controlling the speaker
orientation adjustment means based on the detection result of the position detection means.
[Selected figure] Figure 1
Speaker control device and speaker device
[0001]
The present invention relates to a speaker device that provides audio to a user seated in a seat.
[0002]
A speaker device provided in a seat such as a vehicle and providing audio to a user sitting there
is more comfortable by providing individual audio for each user or directly providing audio to the
user's ear It is a useful device that can form an acoustic space.
In Patent Document 1, the position of the speaker can be appropriately adjusted for each user
having a different height by appropriately adjusting the curvature of the arm member attached to
the headrest of the seat (see particularly FIGS. 7 and 8). . As a result, it becomes possible to
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individually provide music and the like selected by the user sitting on the seat.
[0003]
Further, Patent Document 2 discloses a technique relating to a similar speaker device and for
forming a more comfortable sound space. In this technique, a detection device for accurately
detecting the position of the head of the user is provided, and the frequency characteristics and
the like of the sound output from the speaker are corrected based on the detected position of the
head. As a result, a sound space suitable for each user is formed. Further, Patent Document 3
discloses a technique for detecting the position of the head of a user sitting in a seat. In the art,
head position detection is performed based on the seat position, the backrest angle, and the
headrest height. Further, Patent Document 4 discloses a configuration of a speaker device that
protrudes from a headrest and emits sound from the vicinity of the user's ear. JP-A-2005167378 JP-A-7-131883 JP-A-7-193900 JP-A-2002-191469
[0004]
In a conventional speaker apparatus provided in a seat, the height of the speaker is provided in
order to form a more comfortable acoustic space, considering that the head position varies with
individual differences when the user sits in the seat. Was changed according to the user's head
position. However, in the speaker apparatus provided in the seat, although the direction is
generally set so that the voice is provided to the head position of the user, it is the mainstream
that the direction is fixed.
[0005]
In such a case, even if the height of the speaker is changed according to the position of the head
of the user, the direction of the speaker, that is, the direction (sound axis direction) of the sound
output from the speaker proceeds toward the user's ear position It will not be in the Therefore,
the user can not produce an effect that can be felt by the voice given to the user's ear for a
predetermined purpose, so that the formation of a comfortable acoustic space for the user is
hindered.
[0006]
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Therefore, in view of the above problems, the present invention provides a speaker device
capable of forming a more comfortable sound space for each user, based on the change in the
position of the ear for each user who sits on a seat. With the goal.
[0007]
In the present invention, in order to solve the problems described above, the orientation of the
speaker provided on the seat is controlled according to the position of the headrest having the
function of mainly supporting the head of the user in the seat, in particular the upper and lower
position thereof. I decided.
That is, according to the present invention, by associating the position of the headrest with the
position of the head of the user, it is possible to easily find out the position of the user's ear and
reflect it on the optimal orientation of the speaker.
[0008]
Therefore, when the present invention is first grasped from the side of the speaker control device
that controls the direction of the speaker, the present invention that can solve the above
problems can detect the position of the headrest that can support the head of the user sitting in
the seat. It is a speaker control device which has a control means which controls a speaker
adjustment means which adjusts direction of a speaker provided in the seat based on a detection
result of the position detection means. As described above, by controlling the position of the
headrest where the user sits in relation to the orientation of the speaker, it is possible to provide
an optimum state of the voice from the speaker to the user's ear, thus forming a more
comfortable acoustic space. It contributes to
[0009]
Next, it is also possible to capture the present invention from the side of a speaker device that
carries an audio output. More specifically, the present invention provides a speaker provided in a
seat body and variable in direction, a speaker direction adjusting means for adjusting the
direction of the speaker, a position detecting means for detecting a position of a headrest of the
seat body, And a control unit configured to control the speaker orientation adjustment unit based
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on a detection result of the position detection unit.
[0010]
Further, according to the present invention, a seat main body, a speaker provided on the seat
main body and capable of changing the direction, a headrest provided on the seat main body
capable of supporting the head of a user, and the direction of the speaker are adjusted. The
speaker apparatus may be provided with a speaker orientation adjustment unit, a position
detection unit that detects the position of the headrest, and a control unit that controls the
speaker orientation adjustment unit based on the detection result of the position detection unit.
[0011]
The speaker which comprises the speaker apparatus which concerns on this invention is
provided in the main body of a seat, and the direction is variable so that an audio | voice may be
delivered to a user's ear.
As the installation position of the speaker, a position near the shoulder of the seat body, which is
one of the positions closest to the user's ear position, may be mentioned, but it is needless to say
that other installation positions may be used. The user can receive various sound effects by
directly receiving the sound emitted from the speaker by the ear, that is, by directly receiving the
sound instead of the reflected sound by the ear.
[0012]
Here, the direction of the speaker can be adjusted by the speaker direction adjusting means.
Thereby, the direction is adjusted such that the speaker is directed to the user's ear tip. The
control means controls the adjustment of the direction of the speaker. The control means
controls the direction of the speaker via the speaker orientation adjustment means based on the
position of the headrest of the seat detected by the position detection means. This is because the
position of the headrest is a parameter having a close relationship with the head position of the
user, which makes it possible to detect the user's ear position easily and accurately. Therefore,
the control means can set the orientation of the speaker relative to the position of the user's ear
based on the position of the headrest.
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[0013]
As described above, in the speaker device according to the present invention, since the
adjustment of the direction of the speaker is controlled according to the position of the ear of
each user, a suitable sound is always provided to the user from the speaker. As a result, the user
can enjoy various sound effects by the sound from the speaker in an optimal state.
[0014]
Here, in the above speaker device, the control means may mechanically control the direction of
the speaker such that the speaker is directed to the user's ear position in accordance with the
change in the position of the headrest. . That is, by mechanically interlocking the position of the
headrest and the direction of the speaker, it is possible to control the adjustment of the direction
of the speaker more simply.
[0015]
Further, the above-mentioned speaker device further comprises position estimation means for
estimating the position of the user's ear based on the position of the head rest detected by the
position detection means, and the control means comprises the position estimation means. The
direction of the speaker may be controlled via the speaker direction adjusting means so that the
speaker faces the user's ear tip position estimated by the above. That is, the position estimation
means actively estimates the position of the user's ear from the position of the headrest detected
by the position detection means, and the control means controls the orientation adjustment of
the speaker based on the estimation result. For example, a mode in which the vertical position of
the headrest is detected by a sensor and the direction of the speaker is changed by a motor or
the like based on the detection result corresponds to the speaker device according to the present
invention.
[0016]
Here, when the direction of the speaker is controlled by the speaker direction control means in
the above-described speaker device, when the direction of the speaker is controlled by the
control means, the distance between the speaker and the user's ear position Based on the sound
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pressure adjustment means for adjusting the output sound pressure of the speaker may be
further provided. As described above, the feature of the speaker device according to the present
invention is that the direction of the speaker is changed according to the position of the headrest.
At this time, when the orientation of the speaker is changed, the distance between the speaker
and the position of the user's ear may fluctuate, which may possibly have a significant effect on
the formation of the user's acoustic space. And one of the parameters forming the acoustic space
is the volume of the output voice. Therefore, in the speaker device according to the present
invention, the sound pressure adjusting means adjusts the output sound pressure of the speaker
based on the distance between the speaker and the user's ear position, in other words, based on
the direction of the speaker. This makes it possible to more suitably maintain the acoustic space
provided to the user.
[0017]
Also, in order to make the sound effect by the sound emitted from the speaker more preferable,
the sound signal related to the distance between the speaker and the user's ear position may be
appropriately corrected. That is, in the speaker devices described above, when the direction of
the speaker is controlled by the control means, of the audio signals supplied to the speaker, a
predetermined audio signal related to the distance between the speaker and the user's ear
position The audio signal correction unit may further include an audio signal correction unit that
corrects the distance based on the distance between the speaker and the position of the user's
ear.
[0018]
The predetermined audio signal is an audio signal related to the distance between the speaker
and the position of the user's ear, that is, an audio signal preferably corrected to a more
appropriate state when the distance changes. In this way, by adjusting the direction of the
speaker, it is possible to deliver the sound from the speaker to the user's ear position in a more
preferable state, and the delivered sound corresponds to the speaker and the user's ear position.
The sound space provided to the user is more suitable because it is based on the sound signal
corrected according to the distance.
[0019]
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Here, the above-mentioned predetermined sound signal is mentioned in more detail. First, an
audio signal for removing at least a part of a reflected sound generated by an output audio from
another speaker different from the speaker as the predetermined audio signal, the speaker
provided in the seat main body; A reflection removed sound signal formed by a head related
transfer function according to the distance to the user's ear tip position can be mentioned. This
reflection removal sound signal is a signal for forming a removal sound whose phase is
substantially reversed to the reflection sound that reaches the user in order to cancel the
reflection sound, and it corresponds to the distance between the speaker and the user's ear
position It is determined by the head related transfer function. The reflection removal sound by
the reflection removal sound signal is directly delivered to the user's ear, so that unnecessary
reflection sound is effectively removed. Therefore, when the predetermined sound signal is a
reflection removed sound signal, the sound signal correction means resets the head related
transfer function based on the distance between the speaker provided on the seat body and the
position of the user's ear. Thus, it is possible to provide the speaker with sound for more
appropriate reflected sound removal to the user's ear.
[0020]
Secondly, as the predetermined audio signal, the predetermined audio signal may be a sound
effect signal for applying an effect sound to an output sound from another speaker different from
the speaker. The sound effect signal is, for example, a signal for applying an acoustic effect
according to the user's preference, and important elements for generating the acoustic effect are
portions relating to the phase and sound pressure of the sound effect signal. In particular, when
the sound effect is applied to the main sound output from the speaker different from the speaker,
the timing at which the main sound and the sound effect reach the user's ear position, and the
sound effect at that time The strength of the is important. Therefore, when the predetermined
sound signal is a sound effect signal, the sound signal correction means relates to the phase and
sound pressure of the sound effect signal based on the distance between the speaker provided on
the seat body and the user's ear position. At least one of the parts may be adjusted. By doing this,
it is possible to provide a sound for a more appropriate sound effect from the speaker to the
user's ear.
[0021]
Here, in the above-described speaker apparatus, when the position of the headrest is at the
uppermost position, the control means determines that the direction of the speaker is a
predetermined top which is the ear tip position of the user when the height of the user is 178
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cm. The direction of the speaker may be controlled to be directed to the ear tip position. In
addition, when the position of the headrest is at the lowermost position, the control means causes
the direction of the speaker to be directed to a predetermined lowermost ear position which is a
position near the user's ear when the height of the user is 144 cm. The orientation of the speaker
may be controlled.
[0022]
The height of 178 cm in the former is the upper limit of its 2σ in the normal distribution of
height of Japanese men. Therefore, by setting 2σ of the normal distribution of the height of the
Japanese male at the top position of the headrest, it is possible to properly direct the speaker to
at least about 95% of the positions of the ears of the Japanese male. It should be noted that, since
women are statistically shorter in height than men, setting the position of the headrest in this
way may allow the speaker to be properly oriented for a greater proportion of women.
[0023]
Also, the height of 144 cm in the latter is the lower limit value of 2σ in the normal distribution
of heights of Japanese women. Therefore, by setting 2σ of the normal distribution of heights of
Japanese women to the lowest position of the headrest, it is possible to properly direct the
speaker to at least about 95% of the positions of the ears of Japanese women. . In addition, since
men are statistically taller than women, setting the position of the headrest in this way will allow
the speakers to be properly oriented for more men.
[0024]
Furthermore, in the speaker device according to the present invention, depending on the area
and country in which it is used, according to the normal distribution of the height of the user
who uses the speaker device, the top position or the bottom of the headrest as described above
The position may be determined. In general, since men are statistically taller than women, it is
preferable to determine the top position according to the normal distribution of heights of male
users and the bottom position according to the normal distribution of heights of female users.
For example, for the United States, the top position is 188 cm and the bottom position is 147 cm.
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[0025]
It is possible to provide a speaker device capable of forming a more comfortable acoustic space
for each user, based on the change in the position of the ear for each user who sits on a seat.
[0026]
Here, an embodiment of a speaker device according to the present invention will be described
based on the drawings.
[0027]
FIG. 1 is a view showing a schematic configuration of a speaker device according to the present
invention provided in a seat 1 on which a user can sit.
The seat 1 mainly includes a seat body 3 and a headrest 2, and the user can sit on the seat body
3 and support the head by the headrest 2.
The headrest 2 is disposed at the upper position of the seat body 3 via the two mounting feet 2a,
and can move up and down relative to the seat body 3. This is mainly to allow the user sitting in
the seat 1 to adjust the position of the headrest 2 suitable for supporting his / her head. In
addition, as this seat 1, the seat of vehicles, such as a vehicle and a train, and the seat installed in
buildings, such as a theater, can be illustrated, and a seat of other uses may be sufficient.
[0028]
The seat speakers 4 constituting the speaker device according to the present invention are
respectively provided on the left and right sides of the shoulder portion of the seat body 3, and
the seat speaker 4 outputs an audio signal supplied from the audio reproduction device 20 as
audio. Therefore, when the user sits on the seat 1, it is possible to hear the sound emitted from
the seat speaker 4. Further, the seat speaker 4 is adjusted in direction so that the sound axis is
directed toward the ear of the user sitting on the seat 1 (see FIG. 2). Details will be described
later). As a result, the user can directly hear the sound emitted from the seat speaker 4.
Moreover, although the audio | voice signal supplied from the audio | voice reproduction
apparatus 20 is converted into an audio | voice, and the speaker provided to a user is provided
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also other than the seat speaker 4, it is not shown in figure. For example, although not shown, a
speaker or the like capable of providing the user sitting on the seat 1 with audio from the front
may be further provided.
[0029]
Here, the direction adjustment of the seat speaker 4 will be described in detail. The sound
emitted from the speaker 4 is particularly preferable to be delivered directly to the user's ear. For
example, as the voice, unnecessary reflected sound generated by a voice emitted from a speaker
(not shown) other than the seat speaker 4 (for example, in the case where the seat 1 is a seat
provided in the vehicle, Reflection-removed sound for removing unnecessary reflected sound and
the like generated by the reflection of sound, and sound effects for producing an acoustic effect
according to the preference of the user. Such voices can be delivered directly to the user's ear, so
that their original effects can be exhibited.
[0030]
Therefore, when the sound axis direction of the seat speaker 4 deviates from the ear position of
the user sitting on the seat 1, the directivity of the seat speaker 4 is affected, and it becomes
difficult for the user to fully enjoy the above effect. Therefore, in the speaker device according to
the present invention, the direction adjustment of the seat speaker 4 is performed according to
the position of the user's ear. The mechanism for adjusting the direction will be further described
based on FIG.
[0031]
The seat speaker 4 is rotatably installed in the seat body 3. Then, the rotation is performed
around the rotation axis 8 in such a direction that the face (usually, the front face) from which
the sound of the seat speaker 4 is output can follow the position of the user's ear. The rotary
shaft 8 connects the left and right seat speakers 4 and a power transmission unit 7 having a
speed reduction function is provided in the middle of the rotary shaft 8, and is connected to the
motor 5 as a driving device through the power transmission unit 7. Be done. Accordingly, the
orientation adjustment of the seat speaker 4 is performed by driving the motor 5. The motor 5,
the power transmission unit 7, and the rotating shaft 8 are provided in the seat body 3.
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[0032]
Further, a position sensor 6 for detecting the relative vertical position of the headrest 2 with
respect to the seat body 3 is provided in the seat body 3. The position sensor 6 is a sensor
composed of, for example, a linear scale, and detects the position of the mounting foot 2a to
detect how much the headrest 2 moves vertically with respect to the seat body 3 It is possible.
Since the upper and lower positions of the headrest 2 correspond to the head position of the
user, the head position is a parameter for easily estimating the ear position of the user via the
head position of the user from the upper and lower positions. The position sensor 6 is electrically
connected to the microcomputer 10, and the microcomputer 10 acquires the detected upper and
lower positions.
[0033]
The microcomputer 10 is also electrically connected to the motor 5, and when the drive
command is issued to the motor 5, the direction adjustment of the seat speaker 4 is performed.
Here, based on FIG. 2, an outline of the adjustment of the direction of the seat speaker 4 will be
described. In FIG. 2, the state of the seat 1 when the two-in-one users A and B sit on the seat 1
and the orientation of the seat speaker 4 are shown in a compared state. Note that, since the
height of the user A is smaller than that of the user B, a state in which the head position is lower
than the user B is shown in FIG.
[0034]
As described above, when the head position when sitting on the seat 1 is different due to the
difference in height, the user adjusts the vertical position of the headrest 2 so that his / her head
is sufficiently supported. In the state shown in FIG. 2, since the head position is different between
the user A and the user B, the vertical position of the headrest 2 is adjusted so that the user B is
higher by Δh. At this time, the microcomputer 10 detects the vertical position of the headrest 2
through the position sensor 6 to estimate the head position of the user and further the ear
position so that the sound axis of the seat speaker 4 faces the ear position. Then, a drive
command is issued to the motor 5. As a result, the direction of the seat speaker 4 corresponding
to the user B is turned upward by Δθ from the direction of the seat speaker 4 corresponding to
the user A.
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[0035]
The flow of the process of adjusting the direction of the seat speaker 4 by the microcomputer 10
will be described in detail with reference to FIG. The speaker orientation adjustment process
shown in FIG. 3 is a routine repeatedly executed by the microcomputer 10 in a predetermined
cycle.
[0036]
First, in S101, the vertical position of the headrest 2 is detected. This is done via the position
sensor 6 as described above. When the process of S101 ends, the process proceeds to S102. In
S102, based on the vertical position of the headrest 2 detected in S101, the user's ear position is
estimated. Specifically, the microcomputer 10 has a control map in which the upper and lower
positions are associated with the user's ear position, and the user's ear position is estimated by
referring to the control map according to the upper and lower positions of the headrest 2 Be
done. In addition, in estimation of a user's ear tip position, not only the up-and-down position of
headrest 2 but other parameters may be considered. For example, the estimated ear position may
be corrected in consideration of information on the gender of the user separately input from the
user, the inclination of the seat body 3 detected by a sensor provided separately, and the like.
When the process of S102 ends, the process proceeds to S103.
[0037]
In S103, support for rotational drive is output to the motor 5 such that the sound axis of the seat
speaker 4 is directed to the user's ear tip position estimated in S102. As a result, the seat speaker
4 is rotationally driven about the rotation axis 8, and the direction is set with respect to the user's
ear position. As a result, as shown in FIG. 2, different directions are set for the user A and the
user B, respectively. When the process of S103 ends, the process proceeds to S104.
[0038]
At S104, at the present time, an audio signal is provided from the audio reproduction device 20
to the seat speaker 4, and it is determined whether or not the audio is reproduced there. That is,
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it is determined whether the user is provided with the sound through the seat speaker 4 or not. If
it is determined that the sound is reproduced, the process proceeds to S105, and if it is
determined that the sound is not reproduced, the speaker orientation adjustment process is
ended.
[0039]
Here, each process of S105 to S107 is a process related to correction / adjustment of an audio
signal for forming an audio provided to the user from the seat speaker 4. These processes are
performed in consideration of the fact that the distance between the seat speaker 4 and the
user's ear position (hereinafter referred to as “predetermined distance”) is changed by
adjusting the direction of the seat speaker 4. It is a process to be done. That is, the sound emitted
from the seat speaker 4 is delivered to the user's ear directly and the effect by the sound appears
most efficiently, and when the predetermined distance is changed, the sound emitted from the
seat speaker 4 is Since the time to reach the user and the sound pressure of the voice change,
these processes are performed to avoid the reduction of the effect. Specifically, control signals for
these processes are sent from the microcomputer 10 to the audio reproduction device 20.
[0040]
First, in S105, the sound pressure of the entire output sound output from the seat speaker 4 is
adjusted in accordance with the predetermined distance. Specifically, the predetermined distance
is estimated based on the orientation of the seat speaker 4 related to the predetermined distance,
and the sound pressure of the output sound is adjusted according to the predetermined distance.
For example, in the state shown in FIG. 2, since the direction of the seat speaker 4 corresponding
to the user B points upward than the direction of the seat speaker 4 corresponding to the user A,
the predetermined distance Lb related to the user B relates to the user A It can be seen that the
distance is longer than the predetermined distance La. Therefore, in S105, the sound pressure of
the output sound is adjusted to be proportional to each of the predetermined distances Lb and
La. When the process of S105 ends, the process proceeds to S106.
[0041]
In S106, correction of the reflection removal sound signal for forming the reflection removal
sound emitted from the seat speaker 4 is performed. Since this reflection removal sound signal is
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formed according to the head transfer function to the seat speaker 4 and the user's ear position,
the head is determined based on the predetermined distance estimated according to the
adjustment of the direction of the seat speaker 4 The partial transfer function is reset and
correction of the reflection removed sound signal is performed based thereon. When the process
of S106 ends, the process proceeds to S107.
[0042]
In S107, correction of the sound effect signal for forming the above-mentioned sound effect
output from the seat speaker 4 is performed. When this sound effect is a sound effect imparted
to the main sound emitted from a speaker other than the seat speaker 4, the timing at which the
main sound and the sound sound reach the user's ear becomes important. That is, since there is a
possibility that the user may feel discomfort if the timing is shifted, the phase of the sound effect
signal is adjusted to be more appropriate timing, and the sound effect of the sound effect given to
the user is appropriate. The sound pressure of the sound effect is adjusted to achieve the state.
After the process of S107, the present control is ended.
[0043]
According to the processing described above, since the direction adjustment of the seat speaker 4
is performed according to the head position of the user, the user can be provided with a voice
that is less susceptible to the directivity of the seat speaker 4. This makes it possible to form a
more comfortable acoustic space for each user regardless of the user's head position.
[0044]
The uppermost position of the vertical movement of the headrest 2 of the seat 1 shown in FIG. 1
corresponds to the height of 178 cm of the user, and the lowermost position corresponds to the
height of 144 cm of the user. This is derived from 2σ of the normal distribution of heights of
Japanese people. The vertical movement range of the headrest may be appropriately set from the
normal distribution of the heights of users belonging to the area or country where the speaker
device according to the present invention is used.
[0045]
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<Modification> In the above embodiment, the direction of the seat speaker 4 is controlled by the
motor 5. However, instead of this, the vertical position of the headrest 2 and the direction of the
seat speaker 4 are mechanically interlocked Good. That is, by connecting the rotary shaft 8 for
rotating the seat speaker 4 as shown in FIG. 1 and the mounting foot 2a of the headrest 2 with a
mechanical element such as a worm gear or a pinion, the vertical position of the headrest 2 and
The orientation of the seat speaker 4 is uniquely associated. In this case, the speed reduction
ratio or the like of the mechanical element is sufficiently considered so that the seat speaker 4 is
directed to the user's ear position corresponding to the vertical position of the headrest 2.
Moreover, when adjusting the direction of the seat speaker 4 non-linearly, a cam or the like may
be used.
[0046]
It is a figure which shows schematic structure of the speaker apparatus based on the Example of
this invention. It is a figure which shows the state in which the direction of the seat speaker was
changed in the speaker apparatus based on the Example of this invention. It is the flow which
showed the flow of the speaker direction adjustment processing performed in the speaker
apparatus concerning the example of the present invention.
Explanation of sign
[0047]
1 · · · Seat 2 · · · Headrest 3 · · · Seat body 4 · · · Seat speaker 5 · · · Motor 6 · · · Position sensor 10 ·
· · Microcomputer 20 · · · Voice playback device
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