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JP2010099197

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DESCRIPTION JP2010099197
The present invention provides a desk that creates a zoned acoustic space, and provides a
technique capable of creating an acoustic space without impairing the convenience for the user,
as compared with the conventional. A desk 1 includes a top plate portion 11 forming a top plate
surface 11a, and a leg 12 attached to the top plate portion 11 and supporting the top plate
portion. A flat speaker 13 is provided at an outer peripheral edge portion of the top plate portion
11. The flat speaker 13 is attached so as to be embedded in the top plate portion 11 with the
upper side of the top plate surface 11 a as a sound output direction, and is installed so as not to
provide a step with the desk surface portion. The control unit of the desk 1 supplies an audio
signal input to the input terminal to the flat speaker 13 and causes the flat speaker 13 to output
the sound as sound. [Selected figure] Figure 1
机
[0001]
The present invention relates to a desk.
[0002]
In recent years, various devices have been proposed for creating an acoustic space.
For example, Patent Document 1 proposes a desk which can easily create a zoned acoustic space
without attaching an instrument or the like to the body. In the desk described in Patent
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Document 1, the speaker unit is disposed on the opposite side of the top end of the top portion
toward the user's seating position and in proximity to the top surface, and the top portion also
has the back side of the speaker unit. An acoustic pipe is provided for guiding the sound wave of
the light source to the working end of the top plate.
[0003]
JP 2003-144234 A
[0004]
However, in the technique described in Patent Document 1, since the speaker is fixed to the top
of the top plate, the speaker may be in the way to the user.
Further, the desk described in Patent Document 1 has a problem that the desk can not be
provided with a drawer because the acoustic pipe is attached to the position of the drawer at the
front of the desk, and the convenience for the user is poor. Moreover, in the technique described
in Patent Document 1, since the length of the acoustic tube is fixed, only a predetermined
frequency can be amplified. The present invention has been made in view of the above-described
background, and in a desk creating a zoned acoustic space, a technology capable of creating an
acoustic space without impairing the convenience for the user, as compared with the prior art.
Intended to provide.
[0005]
In order to solve the above problems, according to the present invention, there is provided a top
plate, a flat speaker provided at an edge portion of the top plate with a sound emission direction
above the top plate surface formed by the top plate, and an audio signal. And a signal supply
means for processing and supplying an audio signal input to the input means to the flat speaker.
[0006]
In a preferred aspect of the present invention, a plurality of the flat speakers are provided, and
selection means for selecting a flat speaker to be driven from the plurality of flat speakers is
provided, and the signal supply means is a plane selected by the selection means. The audio
signal input to the input unit may be processed and supplied to the speaker.
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[0007]
Further, in a further preferable aspect of the present invention, by the sound collecting means
provided in the vicinity of the flat speaker in association with the flat speaker, and the sound
signal outputted from the sound collecting means, the signal supply means It may comprise
processing content setting means for setting processing content of signal processing.
[0008]
Further, in a further preferred aspect of the present invention, a sensor for detecting the
presence or absence of a user is provided, and the selection means is a flat speaker to be driven
from the plurality of flat speakers according to a signal output from the sensor. You may choose.
[0009]
Further, in another preferred aspect of the present invention, there is provided an operation
means operated by a user and outputting an operation signal according to the operated content,
and the selection means is responsive to the signal outputted from the operation means.
Alternatively, a flat speaker to be driven may be selected from the plurality of flat speakers.
[0010]
According to the present invention, it is possible to create an acoustic space in a desk that creates
a zoned acoustic space without impairing the convenience for the user, as compared with the
conventional case.
[0011]
<Configuration> FIG. 1 is a side view of a desk 1 according to an embodiment of the present
invention, and FIG. 2 is a top view of the desk 1.
The desk 1 is a desk used in an environment such as an office or a classroom.
As illustrated, the desk 1 includes a top plate portion 11 that forms a top plate surface 11 a, and
a leg 12 that is attached to the top plate portion 11 and that supports the top plate portion 11.
The top plate portion 11 has a circular planar outline shape, and on the peripheral portion of the
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top plate surface 11a, the flat speakers 13a, 13b,..., The microphones 14a, 14b,. , 15b,... Are
provided.
In the following description, for convenience of explanation, when it is not necessary to
distinguish the flat speakers 13a, 13b,..., These will be referred to as “flat speakers 13”.
Similarly, when the microphones 14a, 14b, ... do not need to be distinguished from one another,
they will be referred to as "microphones 14".
Furthermore, when it is not necessary to distinguish between the interpersonal sensors 15a,
15b,..., These are referred to as “interpersonal sensor 15”.
[0012]
A plurality of flat speakers 13 are disposed along the outer peripheral edge of the top plate
portion 11 of the desk. The flat speaker 13 is attached upward so as to be embedded in the top
plate portion 11, and is installed so as not to provide a step with the desk surface portion. The
flat speaker 13 is a speaker that outputs a sound wave of a plane wave, and outputs the sound
wave of the plane wave with the direction of arrow A in the drawing (that is, above the top
surface 11a) as the sound emission direction. The flat speaker 13 is, for example, an electrostatic
speaker. This electrostatic speaker is composed of two electrodes facing each other at an interval
and a sheet-like vibrator having conductivity inserted between the two electrodes. When a
predetermined bias voltage is applied to the vibrating body and the voltage applied to the
electrode is changed, the electrostatic force acting on the vibrating body is changed, and thereby
the vibrating body is displaced. If the applied voltage is changed according to the input acoustic
signal, the vibrator repeats displacement (i.e. vibrates) according to the change of the acoustic
signal, and a sound corresponding to the acoustic signal is generated from the speaker. In this
embodiment, an electrostatic speaker is used as the flat speaker, but the flat speaker is not
limited to the electrostatic speaker, and may be another type of speaker such as an
electromagnetic speaker.
[0013]
A plurality of chairs 2a, 2b,... Are provided around the desk 1 as shown in FIG. The user uses the
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desk 1 while sitting in any of the chairs 2a, 2b,. Note that the chairs 2a, 2b,... Can also move their
positions, and the user moves the chairs 2a, 2b,. can do. In the following description, for
convenience of explanation, when it is not necessary to distinguish the chairs 2a, 2b, ..., they will
be referred to as "chair 2".
[0014]
The microphone 14 provided in the desk 1 is a sound collecting means for collecting a sound and
outputting an audio signal representing the collected sound. The microphone 14 is provided at a
position close to the flat speaker 13 in association with the flat speaker 13. The microphone 14
plays a role of monitoring the acoustic space provided by the planar speaker 13.
[0015]
The interpersonal sensor 15 is a sensor that is provided at the outer peripheral edge of the desk
1 and detects the presence or absence of the user who uses the desk 1. Here, an infrared sensor
is used as the person-to-person sensor 15. The interpersonal sensor 15 is not limited to the
infrared sensor, but may be, for example, an optical sensor, a heat detection sensor, or a
combination of these sensors. The main point is a sensor that can detect the presence or absence
of the user using the desk 1 It may be anything if it is. A plurality of interpersonal sensors 15 are
installed around the desk 1 at predetermined intervals. The interpersonal sensor 15 detects at
which position on the desk 1 or at how long the user is sitting (in the arrangement).
[0016]
Next, the functional configuration of the desk 1 will be described with reference to FIG. FIG. 3 is a
diagram showing an example of a functional configuration of the desk 1. In the figure, voice data
representing voice is input to the input terminal 21. The input terminal 21 may be connected to,
for example, a personal computer, and audio data may be input from the personal computer. For
example, a microphone for picking up sound may be connected, and audio data may be input
from the connected microphone. The point is that any voice data may be input.
[0017]
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The control unit 22 includes a memory such as a central processing unit (CPU), a read only
memory (ROM), and a random access memory (RAM), and controls each unit of the desk 1. The
control unit 22 processes and supplies an audio signal input to the input terminal 21 to the flat
speaker 13. Here, the control unit 22 supplies the audio data input to the input terminal 21 to
the D (digital) / A (Analog) conversion unit 23. The D / A conversion unit 23 converts the audio
data in digital format supplied from the control unit 22 into an analog signal, and supplies the
analog signal to the LPF 24. The LPF 24 performs low-pass filter processing on the audio signal
converted into an analog signal by the D / A conversion unit 23 and outputs the audio signal to
the AMP 25. The AMP 25 amplifies the audio signal output from the LPF 24 and outputs the
amplified audio signal to the planar speaker 13. The flat speaker 13 emits sound at an intensity
corresponding to the audio signal output from the AMP 25. As described above, a signal
corresponding to the audio signal input to the input terminal 21 is output to the flat speaker 13
and emitted from the flat speaker 13 toward the ceiling. The user listens to the sound emitted
from the flat speaker 13 while sitting on the chair 2.
[0018]
The sound wave output from the flat speaker 13 is reflected by the ceiling. The microphone 14
picks up the sound reflected by the ceiling and the ambient sound, and outputs an audio signal
representing the picked-up sound. The AMP 26 amplifies the audio signal output from the
microphone 14 and outputs the amplified audio signal to the LPF 27. The LPF 27 performs lowpass filter processing on the audio signal output from the AMP 26 and outputs the result to the S
/ H unit 28. The S / H unit 28 performs sampling and holding processing on the signal output
from the LPF 27 and supplies the signal to the A / D conversion unit 29. The A / D conversion
unit 29 converts the analog signal output from the S / H unit 28 into digital audio data, and
outputs the audio data to the control unit 22.
[0019]
The control unit 22 mixes the audio data (hereinafter referred to as “first audio data”) input to
the input terminal 21 and the audio data (hereinafter referred to as “second audio data”)
supplied from the A / D conversion unit 29. The difference between the two is detected by
comparison, and the first audio data is corrected according to the detection result. The control
unit 22 supplies the corrected sound data to the D / A conversion unit 23 and causes the flat
speaker 13 to output the sound as sound. As described above, in the present embodiment, the
control unit 22 compares the first audio data and the second audio data, and corrects the first
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audio data according to the difference between the two, thereby allowing the user to listen to the
sound. Adjust the acoustic characteristics at the position and automatically adjust to the optimal
sound field.
[0020]
The interpersonal sensor 15 detects the presence or absence of the user, and outputs a signal
indicating the detection result to the AMP 30. The AMP 30 amplifies the signal from the personal
sensor 15 and outputs the amplified signal to the LPF 31. The LPF 31 performs low-pass filter
processing on the signal from the AMP 30 and outputs the signal to the S / H unit 32. The S / H
unit 32 performs sampling and holding processing on the signal output from the LPF 31 and
outputs the signal to the A / D conversion unit 33. The A / D conversion unit 33 performs A / D
conversion on the supplied signal and outputs the signal to the control unit 22.
[0021]
The control unit 22 analyzes the signal supplied from the A / D conversion unit 33, and selects
the flat speaker 13 to be driven from among the plurality of flat speakers 13 according to the
analysis result. That is, the control unit 22 selects the flat speaker 13 to be driven from among
the plurality of flat speakers 13 according to the detection result of the personal sensor 15. Here,
a table indicating the correspondence between the sensor 15 and the one or more flat speakers
13 provided in proximity to the sensor 15 is stored in advance in the memory of the control unit
22, and the control unit 22 The flat speaker 13 corresponding to the person-to-person sensor 15
whose user is detected to be present is selected with reference to the table stored in the memory.
The control unit 22 supplies the audio signal input to the input terminal 21 to the selected flat
speaker 13. By doing this, the flat speaker 13 selected by the control unit 22 emits an audio
according to the supplied audio signal.
[0022]
<Operation> Next, the operation of this embodiment will be described with reference to FIG. 4
and FIG. The user S sits on a chair 2 installed around the desk 1. When the user S is seated on the
chair 2, as shown in FIG. 4, the interpersonal sensor 15 of the desk 1 detects the user S and
outputs a signal indicating the detection result. The control unit 22 receives a signal output from
the person-to-person sensor 15 via the AMP 30, the LPF 31, and the like, and selects the flat
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speaker 13 to be driven from among the plurality of flat speakers 13 according to the received
signal. Here, the control unit 22 refers to the table stored in the memory to select the flat speaker
13 to be driven. In the memory, as described above, the user is detected because one or a
plurality of flat speakers 13 provided close to the individual sensor 15 are stored in association
with each of the individual sensor 15. The flat speaker 13 provided close to the person sensor 15
is selected. Specifically, for example, in the example shown in FIG. 1, when the person-to-person
sensor 15a detects a user, the flat speaker 13a provided in the vicinity of the person-to-person
sensor 15a is selected.
[0023]
The control unit 22 supplies the audio signal input to the input terminal to the selected planar
speaker 13 via the D / A conversion unit 23, the LPF 24, and the like. As a result, the flat speaker
13 selected by the control unit 22 emits an audio according to the supplied audio signal. Since
the flat speaker 13 provided on the desk 1 emits a plane wave, the sound emitted from the flat
speaker 13 may leak to other than the position of the flat speaker 13 (that is, the position at
which the user is seated). Few. Therefore, the zoned sound space can be created without
providing a partition or the like.
[0024]
By the way, as described above, the sound wave output from the flat speaker 13 is reflected by
the ceiling. As shown in FIG. 5, the microphone 14 picks up the sound reflected by the ceiling T
and the ambient sound, and outputs an audio signal representing the picked up sound. The
control unit 22 receives voice data (second voice data) representing voice collected by the
microphone 14 through the AMP 26, the LPF 27, etc., and the voice data (first voice data) input
to the input terminal 21. Processing content of the signal processing is set according to the
difference between the second audio data and the second audio data, and the first audio data is
signal-processed with the set processing content and output to the D / A converter 23. The audio
data (that is, the audio data subjected to the signal processing by the control unit 22) output to
the D / A conversion unit 23 is output as a sound from the flat speaker 13 via the LPF 24 and the
AMP 25. As described above, the control unit 22 corrects the first voice data to adjust the
acoustic characteristics at the listening position of the user.
[0025]
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Next, the case where a plurality of users use the desk 1 will be described. When the desk 1 is
used by a plurality of users, the interpersonal sensor 15 provided at each position of the plurality
of users detects the users and outputs a signal indicating the detection result. The control unit 22
is a flat speaker provided at a position corresponding to the position of each of a plurality of
users (a position adjacent to the position of the user or the position of the user) based on the
signal output from the personal sensor 15 Choose 13. The control unit 22 supplies an audio
signal to the selected flat speaker 13. Specifically, for example, in the example shown in FIG. 2,
when the three interpersonal sensors of the interpersonal sensors 15a, 15d, 15f detect the user,
flat speakers corresponding to the respective interpersonal sensors 15a, 15d, 15f 13a, 13d and
13f are selected and emitted from the selected flat speakers 13a, 13d and 13f. At this time, the
selected flat speakers 13 respectively output a plane wave having directivity to the upper side, so
there is little sound leakage to the surroundings. Therefore, according to the present
embodiment, a comfortable acoustic space can be simultaneously provided to a plurality of users
in an open space that does not use partitions such as partitions.
[0026]
Further, in the present embodiment, the flat speaker 13 is mounted so as to be embedded in the
top plate portion 11 of the desk 1 and is installed so as not to provide a step with the desk
surface portion. There is no risk of getting lost. In addition, since it is not necessary to attach an
acoustic pipe to the desk 1 in order to use a flat speaker, it is possible to take various shapes,
such as providing a drawer on the front, and to provide a desk convenient for the user. Can.
Further, in the present embodiment, since it is not necessary to attach an acoustic tube, the
frequency of the sound wave is not limited.
[0027]
As described above, according to the present embodiment, it is possible to provide a comfortable
acoustic space in an open space that does not use a partition such as a partition, without giving a
load that a user wears a speaker or a microphone. .
[0028]
Moreover, in the present embodiment, since the flat speaker 13 faces upward, generation of a
standing wave can be considered between the ceiling and the top plate portion 11. However, the
microphone 14 is disposed, so that the difference in audio signal is generated. The sound
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characteristics at the listening position can be automatically adjusted by
By doing this, it is possible to reduce the sound leakage even though there is no partition such as
a partition.
[0029]
Although the embodiments of the present invention have been described above, the present
invention is not limited to the above-described embodiments, and can be implemented in various
other modes. An example is shown below. In addition, you may combine the following each
aspect suitably. (1) In the above-described embodiment, the desk 1 having a circular top surface
contour shape is used, but the shape of the desk is not limited to a circular shape, and may be,
for example, a rectangular shape. It may be Moreover, although the above-mentioned
embodiment demonstrated the desk 1 which comprises one leg 12, the number of legs may be
plural.
[0030]
Moreover, in the above-mentioned embodiment, although the planar speaker 13, the microphone
14, and the person-to-person sensor 15 illustrated the desk 1 respectively provided with two or
more, the number of the planar speaker 13, the microphone 14, and the person-to-person sensor
15 was illustrated. The number is not limited to plural but may be one. The point is that the desk
1 may be provided with one or more of the flat speaker 13, the microphone 14 and the personto-person sensor 15.
[0031]
(2) In the embodiment described above, the control unit 22 selects the flat speaker 13 to be
driven with reference to the table stored in the memory, but the selection process is not limited
to this. Information indicating the position of the sensor 15 and information indicating the
position of each flat speaker 13 are stored in the memory of the control unit 22 in advance, and
the control unit 22 detects that the user is present. By referring to the position information, one
or more flat speakers 13 provided at a position close to the sensor 15 may be selected.
[0032]
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In the above embodiment, the user in the seat is detected by the person-to-person sensor 15, and
the control unit 22 selects one or more flat speakers 13 to be used according to the detection
result. The selection mode of 13 is not limited to this, and for example, an operation unit
operated by the user may be provided, and the control unit 22 may select a flat speaker to be
driven according to a signal output from the operation unit. May be
In this case, the desk 1 is configured to be provided with an operation unit such as a button or a
switch that is operated by the user and outputs a signal according to the operated content. When
the user operates the operation unit, the control unit 22 selects the planar speaker 13 according
to the signal output from the operation unit.
[0033]
Further, in the above embodiment, the selection process of the flat speaker 13 to be driven may
not be performed. In this case, the configuration may be such that the interpersonal sensor 15 is
not provided. In this case, the control unit 22 supplies an audio signal to the flat speaker 13
provided on the desk 1 without performing the selection process of the flat speaker 13 to be
driven. For example, in the case of using a desk provided with one flat speaker 13 instead of
plural ones, the control unit 22 does not need to perform selection processing. Further, for a
desk provided with a plurality of flat speakers 13, the control unit 22 may supply an audio signal
to all of the plurality of flat speakers 13 provided on the desk.
[0034]
(3) The input terminal 21 in the embodiment described above may be provided, for example, on
the top plate portion 11 a of the desk 1, or may be provided, for example, on the leg 12 of the
desk 1. Further, in the above-described embodiment, the plurality of input terminals 21 may be
provided on the desk 1. In this case, a plurality of users can listen to their own desired music and
voice. Further, in this case, the correspondence between the input terminal 21 and the flat
speaker 13 is stored in advance in a memory or the like, and the voice signal input to the input
terminal 21 is converted to the flat speaker 13 corresponding to the input terminal 21. It may be
output to
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[0035]
Further, in the above embodiment, as illustrated in FIG. 2, the flat speaker 13 is disposed so as to
cover the outer peripheral edge portion of the desk 1, but the arrangement of the flat speaker 13
is not limited thereto. Two flat speakers 13 may be allocated as Rch and Lch for each seat, and
various flat speakers 13 may be used. The point is that the flat speaker 13 may be mounted so as
to be embedded in the top plate portion 11 of the desk 1.
[0036]
(4) In the above embodiment, the flat speaker 13 and the microphone 14 are provided in
association with each other. The number of flat speakers 13 and the number of microphones 14
may be the same or different. The point is that the microphone 14 may be provided in
association with the flat speaker 13.
[0037]
Further, in the above-described embodiment, the telephone call function for performing a voice
call may be provided, and the microphone 14 provided on the desk 1 and the planar speaker 13
may be used when making a voice call. Further, an ID authentication function may be added to
the interpersonal sensor so that personal information can be specified. In this case, if an
interpreter is necessary based on personal information, the language is specified, and a language
is automatically selected by providing a voice interpretation function in the control unit 22, and
voice communication is performed in the translated language. Good.
[0038]
Further, in the above embodiment, the microphone 14 may not be provided. In this case, the desk
1 outputs a sound wave from the flat speaker 13 and does not perform the sound collection by
the microphone 14 and the adjustment process of the acoustic characteristics by the control unit
22, but even in this case, it is the same as the above embodiment. In addition, it is possible to
provide individual sound space to the user in an open space that does not use partitions or other
partitions.
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[0039]
It is a side view showing an example of a desk. It is a top view which shows an example of a desk.
It is a figure which shows an example of a functional structure of a desk. It is a figure for
demonstrating the operation | movement of this embodiment. It is a figure for demonstrating the
operation | movement of this embodiment.
Explanation of sign
[0040]
DESCRIPTION OF SYMBOLS 1 ... desk 2, 2 chair, 11 ... top plate part, 12 ... leg, 13 ... plane
speaker, 14 ... microphone, 15 ... antiperson sensor, 21 ... input terminal, 22 ... control part, 23 ...
D / A conversion part, 24, 27, 31 ... LPF, 25, 26, 30 ... AMP, 28, 32 ... S / H unit, 29, 33 ... A / D
conversion unit.
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