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JP2013077002

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DESCRIPTION JP2013077002
Abstract: PROBLEM TO BE SOLVED: To control and produce an effect on the sound quality of
resonance of a soundboard when a vibration excitation unit for vibrating a soundboard is
attached. In a grand piano according to an embodiment of the present invention, performance
information is output from a performance output unit (120) to a signal output unit (15) in
response to an operation of a key (2) in weak tone mode, and the signal output unit (15) is used
as performance information. The drive signal indicating the sound based on is output to the
plurality of excitation units 50H and 50L provided on the soundboard. The frequency
characteristics of the drive signal input to each of the plurality of vibration excitation units 50H
and 50L are at the time of excitation according to the vibration characteristics of the soundboard
at the connection position to the soundboard of the vibration unit included in each vibration
excitation unit. The adjustment is performed by the equalizer unit 152 so as to suppress the
resonance of the sound board. [Selected figure] Figure 7
Keyboard instrument
[0001]
The present invention relates to a technology for changing the sound of a keyboard instrument.
[0002]
In an electronic piano, it is generally performed to generate an electronic sound from a speaker.
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In order to generate not only this electronic sound but also rich bass, a soundboard may be
provided also in the electronic piano. In this case, for example, Patent Document 1 discloses a
technique of emitting a sound from a soundboard by attaching a speaker to a soundboard and
exciting the soundboard with the speaker. The application of this technology is not limited to
electronic pianos, and it is also disclosed that the technology is applicable to silent pianos
configured not to vibrate strings.
[0003]
JP, 2008-292739, A
[0004]
The sound quality of an acoustic piano is largely due to the vibration characteristics of a
soundboard that emits sound.
When a speaker is attached to a soundboard of an acoustic piano and the soundboard is vibrated,
the soundboard may resonate at a specific frequency depending on the attachment position. In
this case, due to the influence of resonance, the sound quality of the vibration sound from the
speaker may change, or the string corresponding to the resonance frequency may vibrate, which
may result in unintended sound generation. Therefore, after examining the mounting position in
detail, it was necessary to mount the speaker at a position where resonance does not occur, or to
change the design of the sound board itself to adjust the vibration characteristics. In addition,
when the number of speakers to be attached increases, it may be very difficult to select an
attachment position and to design a sound board. The present invention has been made in view
of the above-described circumstances, and it is an object to control and influence the influence of
the vibration characteristics of the soundboard on the sound quality when a vibration excitation
unit for vibrating the soundboard is attached. I assume.
[0005]
In order to solve the above-mentioned problems, the present invention relates to a key, a
sounding body provided corresponding to the key, a hammer for striking the sounding body in
response to the operation of the key, and vibration of the sounding body. An excitation unit that
has a soundboard that vibrates along with a vibration unit that vibrates according to an input
drive signal, is connected to the soundboard, and vibrates the soundboard by the vibration of the
vibration unit; A performance information output unit for outputting performance information
according to an operation, and a signal output unit for outputting the drive signal indicating a
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sound based on the performance information to the excitation unit, the drive signal being the
excitation The present invention provides a keyboard instrument characterized in that it is a
signal having a frequency characteristic according to the vibration characteristic of the
soundboard at a position where the unit is connected to the soundboard.
[0006]
Further, in a preferable aspect, the drive signal input to one of the plurality of excitation units is
provided with the plurality of excitation units connected to the soundboard at different positions
of the sound board, respectively. Is a signal having a frequency characteristic different from that
of the drive signal input to the other excitation unit different from the one excitation unit among
the plurality of excitation units.
[0007]
Further, in another preferable aspect, the drive signal is a signal having a frequency
characteristic that suppresses the resonance of the soundboard at a position where the excitation
unit is connected to the soundboard.
[0008]
In another preferable aspect, the soundboard is provided with a first piece and a second piece,
and the first plate connected to a position corresponding to the first piece of the soundboard. An
excitation unit, and a second excitation unit connected to a position corresponding to the second
piece of the soundboard may be provided.
[0009]
Further, in another preferable aspect, the vibration unit receives the drive signal, has a voice coil
disposed on a magnetic path, and measures a voltage generated at both ends of the voice coil
along with the vibration of the soundboard. A voltmeter and a frequency characteristic specifying
unit for specifying a frequency characteristic of the drive signal based on a voltage value output
from the voltmeter.
[0010]
According to the present invention, in the case where the excitation unit for exciting the
soundboard is attached, it is possible to control and generate the sound by controlling the
influence of the vibration characteristic of the soundboard on the sound quality.
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[0011]
It is a perspective view showing the appearance of the grand piano in the embodiment of the
present invention.
It is a figure explaining the internal structure of the grand piano in embodiment of this invention.
It is a figure explaining the position of the excitation part in embodiment of this invention.
It is a figure explaining the external appearance of the vibration excitation part in embodiment of
this invention.
It is sectional drawing of the vibration excitation part seen from the arrow V-V direction shown in
FIG.
It is a block diagram showing composition of a controller in an embodiment of the present
invention.
It is a block diagram which shows the function structure of the grand piano in embodiment of
this invention. It is a figure explaining the adjustment aspect of the frequency characteristic in
the equalizer part in embodiment of this invention. It is a figure for demonstrating the
mechanism in which a specific frequency characteristic specific | specification part specifies the
frequency characteristic which shows the adjustment aspect of the frequency characteristic with
respect to the drive signal which the equalizer part in embodiment of this invention performs. It
is sectional drawing of the vibration excitation part in the modification 1 of this invention. It is a
figure which shows the internal structure of the upright piano in the modification 2 of this
invention. It is a figure explaining the position of the excitation part in the modification 2 of this
invention. It is a figure explaining the state which attached the vibration excitation part in the
modification 3 of this invention to the soundboard. It is a figure explaining the position of the
excitation part in the modification 7 of this invention. It is a figure which shows the internal
structure of the upright piano in the modification 7 of this invention. It is sectional drawing of
the vibration excitation part in the modification 12 of this invention.
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[0012]
Embodiment [Overall Configuration] FIG. 1 is a perspective view showing an appearance of a
grand piano 1 according to an embodiment of the present invention. The grand piano 1 is a
keyboard instrument having a plurality of keys 2 arranged on the front side of the keys 2 whose
performance operation is performed by the player, and a keyboard 3 having a pedal 3. In
addition, the grand piano 1 has the control device 10 having the operation panel 13 in the front
part, and the touch panel 60 provided in the music stand part. The user's instruction can be input
to the control device 10 by operating the operation panel 13 and the touch panel 60.
[0013]
The grand piano 1 is capable of sounding in the sounding mode according to the user's
instruction among a plurality of sounding modes. In this sound generation mode, a normal sound
generation mode in which only a string by hammer is generated in the same manner as a general
grand piano, a string by hammer is blocked, and excitation is performed using a signal from a
sound source unit such as an electronic sound source. By vibrating the soundboard by the unit, it
is made to sound with a string similar to the operation of the low sound mode and the normal
sound generation mode to make a natural sound with a smaller sound (or a loud sound) than the
normal sound from the sound board. At the same time, by using the signal of the tone color of
the piano to excite the soundboard by the exciter, there is a strong sound mode in which the
player plays with a louder sound than when striking with a hammer (normal sound generation
mode). In this strong sound mode, not only the sound volume is increased, but also the sounding
board is generated by the excitation unit using the hammer to strike a string and using the tone
signal other than the piano (including the tone similar to the piano). It can also be used as a
performance mode to obtain timbre layer effects by simultaneously performing excitation and
sounding. Note that as the sound generation mode, other sound generation modes such as a mute
mode that does not cause external sound generation by supplying the signal from the sound
source unit to the headphone terminal instead of using the signal from the sound source unit for
excitation in the configuration of low sound mode It may exist. The sound generation modes are
arranged as shown in Table 1 below.
[0014]
[0015]
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Further, in the grand piano 1, among the plurality of performance modes, operation in the
performance mode according to the instruction of the user is possible.
The performance mode includes a normal performance mode in which a user performs a
performance operation to cause a sound and an automatic performance mode in which a key is
automatically driven to generate a sound. Note that one of the performance modes may not exist.
[0016]
[Configuration of Grand Piano 1] FIG. 2 is a view for explaining the internal structure of the
grand piano 1 according to the embodiment of the present invention. In this figure, the
configuration provided corresponding to each key 2 is shown paying attention to one key 2 and
the description of the portions provided corresponding to the other keys 2 is omitted. There is.
[0017]
At the bottom of the rear end side of each key 2 (the back side of the key 2 as viewed from the
user who plays) the key driving unit 30 for driving the key 2 using a solenoid when the
performance mode is the automatic performance mode. It is provided. The key drive unit 30
drives the solenoid according to the control signal from the control device 10. The key driving
unit 30 reproduces the same state as when the user depresses the key by driving the solenoid to
raise the plunger, while the same state as when the user releases the key by lowering the
plunger. Reproduce As described above, the difference between the normal performance mode
and the automatic performance mode is whether the key 2 is operated by the user or the key
driving unit 30.
[0018]
The hammer 4 is provided corresponding to each key 2, and when the key 2 is depressed, a force
is transmitted via an action mechanism (not shown) to move and strike the strings 5
corresponding to each key 2. The damper 8 does not contact or contact the string 5 in
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accordance with the depression amount of the key 2 and the depression amount of the damper
pedal of the pedal 3 (hereinafter referred to simply as the damper pedal in the case of simply
referring to the pedal 3). . The damper 8 suppresses the vibration of the string 5 when in contact
with the string 5.
[0019]
The stopper 40 is a member that prevents the hammer 4 from striking the string 5 when the low
sound mode is set. That is, when the sound generation mode is set to the low sound mode, the
hammer shank collides with the stopper 40 to prevent the hammer 4 from striking the string 5
while the normal sound generation mode is set to the stopper 40. , To move to a position that
does not collide with the hammer shank.
[0020]
The key sensor 22 is provided below each key 2 and outputs a detection signal corresponding to
the behavior of the key 2 to the control device 10. In this example, the key sensor 22 detects the
pressing amount of the key 2 and outputs a detection signal indicating the detection result to the
control device 10. The key sensor 22 may output a detection signal indicating that the key 2 has
passed a specific pressing position, instead of outputting a detection signal corresponding to the
pressing amount of the key 2. The specific pressed position is any position in the range from the
rest position of the key 2 to the end position, and it is desirable that the specific pressed position
is a plurality of positions. Thus, the detection signal output from the key sensor 22 may be any
signal as long as the control device 10 can recognize the behavior of the key 2.
[0021]
The hammer sensor 24 is provided corresponding to each hammer 4, and outputs a detection
signal corresponding to the behavior of the hammer 4 to the control device 10. In this example,
the hammer sensor 24 detects the moving speed immediately before striking the string 5 by the
hammer 4 and outputs a detection signal indicating the detection result to the control device 10.
The detection signal may not indicate the moving speed of the hammer 4 itself, and the moving
speed may be calculated in the control device 10 as a detection signal in another mode. For
example, detection signals indicating that the hammer shank has passed may be output at two
positions where the hammer shank passes while the hammer 4 is moving, or one position may be
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passed before the other position. A detection signal may be output indicating the time until
passing through. Thus, the detection signal output from the hammer sensor 24 may be any signal
as long as the controller 10 can recognize the behavior of the hammer 4.
[0022]
The pedal sensor 23 is provided corresponding to each pedal 3, and outputs a detection signal
corresponding to the behavior of the pedal 3 to the control device 10. In this example, the
depression amount of the pedal 3 is detected, and a detection signal indicating the detection
result is output to the control device 10. The pedal sensor 23 may output a detection signal
indicating that the pedal 3 has passed a specific depression position, instead of outputting a
detection signal corresponding to the depression amount of the pedal 3. The specific stepping
position is any position in the range from the rest position of the pedal to the end position, and is
a stepping position which can distinguish between the state in which the damper 8 and the string
5 completely contact and the state in which the damper 5 does not contact. It is more desirable
to make it possible to detect the state of the half pedal by setting a plurality of locations to
specific stepping positions. Thus, the detection signal output from the pedal sensor 23 may be
any signal as long as the control device 10 can recognize the behavior of the pedal 3.
[0023]
Note that the control device 10 detects the striking timing (key-on timing) of the hammer 4 on
the string 5, the striking speed (velocity), and the string according to the detection signals output
from the key sensor 22, the pedal sensor 23 and the hammer sensor 24. If the vibration
suppression timing (key-off timing) of the damper 8 with respect to 5 can be specified according
to each key 2 (key number), the key sensor 22, the pedal sensor 23, and the hammer sensor 24
The result of detecting the behavior of the key 2, the pedal 3 and the hammer 4 may be output
as a detection signal in another mode.
[0024]
The sounding board 7 is connected to the sounding bar 75 and the piece 6 and transmits the
vibration of the sounding board 7 to each string 5 through the piece 6 and the vibration of each
string 5 to the sounding board 7 through the piece 6 Be done.
In addition, an excitation unit 50 is connected to the soundboard 7. The vibration unit 50
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includes a vibration unit 51 connected to the soundboard 7 and a yoke holding unit 52 (main
unit) supported by the support unit 55 connected to the straight support 9. A drive signal is
input to the excitation unit 50 from the control device 10. The vibration unit 51 vibrates
according to the waveform indicated by the input drive signal to excite the soundboard 7. As a
result, the piece 6 is also excited. In this example, the vibration unit 51 has a voice coil 512
arranged to be positioned in the magnetic path formed by the yokes 521 and 523 of the yoke
holding unit 52 and the magnet 522, and is input to the voice coil 512. Vibrate according to the
drive signal (see FIG. 5).
[0025]
FIG. 3 is a view for explaining the position of the excitation unit 50 in the embodiment of the
present invention. In this example, two vibrating units 50H and 50L are provided as the vibrating
unit 50. Hereinafter, when it is not necessary to distinguish the excitation units 50H and 50L
from each other in particular, they will be simply referred to as the excitation unit 50.
[0026]
The excitation unit 50 is connected between a plurality of sound rods 75 among the soundboards
7. The excitation unit 50H is provided at a position corresponding to the piece 6H among the two
pieces 6 (pieces 6H (long pieces) and 6L (short pieces)). On the other hand, the excitation unit
50L is provided at a position corresponding to the piece 6L. That is, the soundboard 7 is
sandwiched between the excitation unit 50H and the piece 6H, and is sandwiched between the
excitation unit 50L and the piece 6L. The number of the excitation units 50 provided in the
soundboard 7 is not limited to two, and may be more, or only one may be provided. In the case
where the number of the excitation units 50 is one while the number of the pieces 6 is two, it is
desirable that the excitation unit 50 be provided on the long piece 6H.
[0027]
The piece 6H is a piece supporting the high-pitched string 5 and the piece 6L is a piece
supporting the low-pitched string 5. Hereinafter, when it is not necessary to distinguish the
pieces 6H and 6L from each other in particular, they are simply referred to as the pieces 6.
Further, as described above, the excitation unit 50 is supported by the support 55 connected to
the straight support 9. Subsequently, the configuration of the excitation unit 50 will be described.
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[0028]
[Configuration of Excitation Unit 50] FIG. 4 is a view for explaining the appearance of the
excitation unit 50 in the embodiment of the present invention. In this figure, in order to make the
main structure of the yoke holding part 52 legible, description is abbreviate | omitted about the
housing | casing 524 (refer FIG. 5) of the yoke holding part 52, and the inside of the housing 524
is shown in figure. The vibrating portion 51 has a cylindrical connection member 511 and a
voice coil 512 whose upper surface connected to the soundboard 7 is closed. The connection
member 511 is formed of a light material such as a resin such as polyimide or a metal such as an
aluminum material, and a cap such as a resin is attached to the upper surface portion. The yoke
holding portion 52 has a magnet 522 and yokes 521 and 523 sandwiching the magnet 522. The
yokes 521 and 523 are made of, for example, a soft magnetic material such as soft iron, and are
very heavy compared to the connection member 511. In addition, the vibrating portion 51 and
the yoke holding portion 52 are separated by a space.
[0029]
FIG. 5 is a horizontal cross-sectional view of a cross section obtained by cutting the excitation
unit 50 shown in FIG. 4 along a vertical plane passing through the center of the connection
member 511. In FIG. 5, a case 524 whose description is omitted in FIG. 4 is also described.
Moreover, in FIG. 5, in order to show the positional relationship of the excitation part 50, the
soundboard 7, and the piece 6, the position of the soundboard 7 and the piece 6 is shown with
the broken line. The vibrating unit 51 has a connection member 511 and a voice coil 512. Voice
coil 512 is disposed on the magnetic path passing through the space formed between yoke 521
and yoke 523 among the magnetic paths (broken line arrows) formed by yokes 521 and 523 and
magnet 522. ing. The drive signal input to the vibration unit 50 is input to the voice coil 512. In
response to the magnetic force in the magnetic path formed as described above, the voice coil
512 generates a driving force so that the connecting member 511 vibrates in the vertical
direction in the figure according to the waveform indicated by the input drive signal. . At this
time, since the yoke holding portion 52 is supported by the support portion 55 and its position is
fixed, most of the driving force generated by the voice coil 512 is used as a thrust for the
vibration of the connection member 511. Be
[0030]
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The upper surface of the connecting member 511 and the sounding board 7 are adhered by an
adhesive, a double-sided tape (not shown) or the like, and the connecting member 511 is fixed to
the sounding board 7. The upper surface of the connection member 511 and the sounding plate
7 are not limited to being connected to each other by adhesion, and may be connected by
screwing or the like. Thereby, the sounding board 7 is pushed upward when the connection
member 511 moves upward, and when the connection member 511 moves downward, the
connection member 511 does not separate, but is moved downward by the connection member
511. It will be pulled by. Thus, the vibration in the connecting member 511 is applied to the
piece 6 through the soundboard 7 and further transmitted to the string 5.
[0031]
Also, the housing 524 accommodates the yokes 521 and 523 and the magnet 522. In addition,
the housing 524 is supported by the support portion 55. At this time, the yoke holding portion
52 constituted by the yokes 521 and 523, the magnet 522 and the housing 524 is supported by
the supporting portion 55 at a position separated from the vibrating portion 51 by a space and
not in contact with the soundboard 7. Be supported. As shown in FIG. 5, in this example, the
support portion 55 supports the yoke holding portion 52 from the lower surface side of the
housing 524. Further, since the vibrating portion 51 (connection member 511) is separated from
the yoke holding portion 52 by a space, the vibrating portion 51 (connection member 511) is
supported by the sounding board 7 by being connected to the sounding board 7.
[0032]
The fact that the vibrating portion 51 and the yoke holding portion 52 are separated by a space
means that they are not in contact with each other in the illustrated configuration, and some of
the portions connected to the vibrating portion 51. A configuration (for example, wiring to the
voice coil 512) may be in contact with the yoke holder 52. At this time, it is desirable that the
load of the yoke holding portion 52 is not applied to the vibrating portion 51 due to the
configuration of the part.
[0033]
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By supporting the yoke holding portion 52 of the vibrating portion 50 by the support portion 55
in this manner, no load other than the vibrating portion 51 of the vibrating portion 50 is applied
to the soundboard 7. There is. In addition, about the aspect which the support part 55 supports
the yoke holding | maintenance part 52, if load other than the vibration part 51 among the
excitation parts 50 does not load with respect to the sound board 7, what kind of aspect is May
be
[0034]
Here, the connecting member 511 is formed of a lighter material such as resin than each
member constituting the yoke holding portion 52. In addition, the entire vibration unit 51
including the voice coil 512 is also very light in comparison with the yoke holding unit 52. Since
the load of the yoke holding portion 52 is applied to the straight support 9 by the support
portion 55, most of the load of the excitation portion 50 is not applied to the soundboard 7.
Although the load on the vibrating portion 51 is applied to the sound board 7, since only a slight
load is applied, the influence on the vibration characteristics of the sound board 7 can be
extremely reduced. The above is the description of the excitation unit 50. Subsequently, the
configuration of the control device 10 will be described.
[0035]
[Configuration of Control Device 10] FIG. 6 is a block diagram showing a configuration of the
control device 10 in the embodiment of the present invention. The control device 10 includes a
control unit 11, a storage unit 12, an operation panel 13, a communication unit 14, a signal
output unit 15, and an interface 16. Each of these configurations is connected via a bus. The
control unit 11 includes an arithmetic device such as a central processing unit (CPU), a storage
device such as a read only memory (ROM), and a random access memory (RAM). The control unit
11 controls each component connected to each part of the control device 10 and the interface 16
based on a control program stored in the recording device. In this example, the control unit 11
causes the control device 10 and a part of the configuration connected to the control device 10
to function as the keyboard instrument of the present invention by executing the control
program.
[0036]
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The storage unit 12 stores setting information indicating various setting contents used when the
control program is being executed. The setting information is, for example, information for
determining the content of the drive signal output from the signal output unit 15 based on
detection signals output from the key sensor 22, the pedal sensor 23, and the hammer sensor 24.
The setting information also includes information indicating a sound generation mode, a
performance mode, and the like set by the user.
[0037]
The operation panel 13 has an operation button or the like for receiving an operation of the user.
When the user's operation is accepted by the operation button, an operation signal
corresponding to the operation is output to the control unit 11. The touch panel 60 connected to
the interface 16 has a display screen such as a liquid crystal display, and a touch sensor that
receives a user's operation is provided on the surface portion of the display screen. On this
display screen, a setting change screen for changing the contents of setting information stored in
the storage unit 12 under the control of the control unit 11 via the interface 16, a setting screen
for setting various modes, a score, etc. Various information is displayed. Also, when the user's
operation is accepted by the touch sensor, an operation signal corresponding to the operation is
output to the control unit 11 via the interface 16. An instruction from the user to the control
device 10 is input by an operation accepted by the operation panel 13 and the touch panel 60.
[0038]
The communication unit 14 is an interface that communicates with another device by wireless,
wired, or the like. This interface may be connected to a disk drive that reads various data
recorded on a recording medium such as a DVD (Digital Versatile Disk) or a CD (Compact Disk)
and outputs the read data. The data input to the control device 10 via the communication unit 14
is, for example, music data used for automatic performance.
[0039]
The signal output unit 15 includes a sound source unit 151 that outputs an acoustic signal, an
equalizer unit 152 that adjusts the frequency characteristic of the acoustic signal, and an
amplification unit 153 that amplifies the acoustic signal (see FIG. 7). The signal output unit 15
outputs an acoustic signal whose frequency characteristic has been adjusted and amplified as a
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drive signal.
[0040]
The interface 16 is an interface that connects the control device 10 to each external
configuration. The components connected to the interface 16 are, in this example, a key sensor
22, a pedal sensor 23, a hammer sensor 24, a key drive unit 30, a stopper 40, an excitation unit
50, and a touch panel 60. The interface 16 outputs the key sensor 22, the pedal sensor 23, a
detection signal output from the hammer sensor 24, and an operation signal output from the
touch panel 60 to the control unit 11. Further, the interface 16 outputs the control signal output
from the control unit 11 to the key driving unit 30, and outputs the drive signal output from the
signal output unit 15 to the vibration unit 50. Subsequently, a configuration that functions by
executing the control program by the control unit 11 will be described.
[0041]
[Functional Configuration of Grand Piano 1] FIG. 7 is a block diagram showing a functional
configuration of the grand piano 1 according to the embodiment of the present invention. As
shown in FIG. 7, when the key 2 is operated, the hammer 4 strikes the string 5 and the string 5
vibrates. This vibration is transmitted to the soundboard 7 via the piece 6. Further, the damper 8
is operated by the operation of the key 2 and the operation of the pedal 3. The operation of the
damper 8 changes the suppression state of the vibration of the string 5.
[0042]
The setting unit 110 is realized by the touch panel 60 and the control unit 11 as a configuration
having the following functions. First, the touch panel 60 receives an operation of the user who
sets the sound generation mode. The control unit 11 changes the setting information according
to the performance mode and the sound generation mode set by the user, and the sound
generation mode selected for the performance information output unit 120 and the blocking
control unit 130 according to these modes. It outputs the control signal shown.
[0043]
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Further, the touch panel 60 receives an operation of the user for setting various control
parameters in the signal output unit 15. The various control parameters are parameters for
determining the timbre of the musical tone indicated by the sound signal output from the sound
source unit 151, the amplification factor in the amplification unit 153, and the like. The
adjustment mode of the frequency characteristic in the equalizer unit 152 is determined in
advance. The adjustment aspect of the frequency characteristic determined in advance will be
described later.
[0044]
A configuration may be adopted in which the user individually sets each control parameter, or
the user selects one preset data from among a plurality of preset data in which the values of each
control parameter stored in advance in storage unit 12 are determined. A configuration may be
employed to set control parameters. The control unit 11 changes the setting information
according to various control parameters set by the user, and controls the drive signal output
from the signal output unit 15 by these control parameters. The amplification unit 153 may use
a configuration in which only the parameters set in advance are used and the parameter change
by the control unit 11 is not performed.
[0045]
The performance information output unit 120 is realized by the control unit 11, the key sensor
22, the pedal sensor 23, and the hammer sensor 24 as a configuration having the following
functions. The behavior of the key 2, the pedal 3 and the hammer 4 is detected by the key sensor
22, the pedal sensor 23 and the hammer sensor 24 respectively, and the control unit 11 detects
the behavior of the string 5 by the hammer 4. The sound source section includes the impact
timing (key on timing), the key 2 number (key number) corresponding to the struck string 5, the
impact speed (velocity), and the vibration suppression timing (key off timing) of the damper 8
with respect to the string 5 It specifies as information (performance information) used in 151. In
this example, the control unit 11 identifies the striking timing and the key 2 number from the
behavior of the key 2, identifies the striking speed from the behavior of the hammer 4, and the
vibration suppression timing includes the key 2 and the pedal 3. Identify from the behavior of
The hitting timing may be specified from the behavior of the hammer 4 or the hitting speed may
be specified from the behavior of the key 2. The performance information may be indicated by,
for example, a control parameter of MIDI (Musical Instrument Digital Interface) format.
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[0046]
The control unit 11 outputs, to the sound source unit 151, performance information indicating
the key number, the velocity, and the key on at the specified key on timing. Further, the control
unit 11 outputs, to the sound source unit 151, performance information indicating the key
number and the key off at the key off timing. The control unit 11 realizes the above function
when the sound generation mode set by the user is the low sound mode or the high sound mode,
while the sound source of the performance information in this example when the normal sound
generation mode is performed. No output to the unit 151 is performed. In the normal sound
generation mode, the drive signal may not be output from the signal output unit 15. Therefore,
even if the configuration is such that the performance information is output, the drive signal
from the signal output unit 15 may be output. The control unit 11 may control so as not to
output.
[0047]
The blocking control unit 130 is realized by the control unit 11 as a configuration having the
following functions. When the tone generation mode set by the user is the low tone mode, the
control unit 11 moves the stopper 40 to a position at which the hammer 4 does not hit the string
5 while the normal tone mode or the high tone mode is set. If it is, the stopper 40 is moved to a
position where it does not block the hammer 4 hitting the string 5.
[0048]
The sound source unit 151 outputs an acoustic signal based on the performance information
output from the performance information output unit 120 (control unit 11). For example, the
sound source unit 151 outputs an acoustic signal such that the volume corresponds to the pitch
corresponding to the key number and the velocity. In this example, the sound source unit 151
receives an acoustic signal (hereinafter, referred to as an acoustic signal H) used for a drive
signal (hereinafter, referred to as a drive signal H) input to the excitation unit 50H and receives
an input to the excitation unit 50L. And an acoustic signal (hereinafter, referred to as an acoustic
signal L) used for a drive signal (hereinafter, referred to as a drive signal L). The acoustic signal H
and the acoustic signal L may be the same signal or different signals. For example, the acoustic
signal H and the acoustic signal L may have different frequency bands. For example, the acoustic
signal H may have a frequency band higher than that of the acoustic signal L. In addition, one
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channel among a plurality of channels for Lch and Rch may be allocated.
[0049]
The equalizer unit 152 adjusts the frequency characteristics of each of the acoustic signal H and
the acoustic signal L and outputs the adjusted signal. The adjustment mode of the frequency
characteristic with respect to the acoustic signal H corresponds to the frequency described later
according to the vibration characteristic of the soundboard 7 at the connection position
(hereinafter referred to as connection position H) of the vibration unit 51 of the excitation unit
50H to the soundboard 7 It is specified by the characteristic specifying unit 155. The adjustment
of the frequency characteristics of the sound signal L is also performed according to the
vibration characteristics of the soundboard 7 at the connection position (hereinafter referred to
as connection position L) of the vibration unit 51 of the vibration excitation unit 50L to the
soundboard 7. It is identified by the frequency characteristic identification unit 155 described
later. An example of the adjustment aspect of these frequency characteristics will be described
with reference to FIG.
[0050]
FIG. 8 is a diagram for explaining how to adjust the frequency characteristic in the equalizer unit
152 in the embodiment of the present invention. FIG. 8A shows an adjustment mode (hereinafter
referred to as frequency characteristic H) of the frequency characteristic with respect to the
acoustic signal H in the equalizer unit 152, and FIG. 8B shows adjustment of the frequency
characteristic with respect to the acoustic signal L in the equalizer unit 152. An aspect
(hereinafter referred to as frequency characteristic L) is shown.
[0051]
The frequency characteristic H suppresses the resonance in the vibration characteristic of the
soundboard 7 at the connection position of the vibration unit 51 of the vibration unit 50H to the
soundboard 7 and suppresses the reduction of the sound at the dip frequency. It has been
decided. In this example, the frequency of dips D1 and D2 in the frequency characteristic H
corresponds to the frequency of the resonance peak. Also, the frequency of the peak P1
corresponds to the frequency of the dip. Note that either such dip or peak may not be present in
the frequency characteristic H. Furthermore, in the frequency characteristic H in this example, in
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response to the influence of the inductance of the voice coil 512, the high frequency
characteristic of the excitation in the excitation unit 50 is degraded, the gain of the high region of
the frequency characteristic H is An increased area S1 is set. Note that the increased region S1
may not exist. The acoustic signal H has a state in which the output level at the resonance peak
frequency is suppressed by the presence of the dips D1 and D2, and a state in which the output
level is reduced at the dip frequency by the presence of the peak P1; Due to the presence of the
amplification region S1, the signal is amplified by the amplification unit 153 in a state in which
the influence of the inductance of the voice coil 512 is suppressed, and is input to the excitation
unit 50H as the drive signal H. Thus, the drive signal H is a signal having a frequency
characteristic set so as to suppress the influence of the resonance peak and dip of the
soundboard 7 at the connection position H. Further, even if the output of the high frequency
band is reduced due to the influence of the inductance of the voice coil 512, the reduction can be
corrected.
[0052]
On the other hand, the frequency characteristic L suppresses the resonance in the vibration
characteristic of the soundboard 7 at the connection position of the vibration unit 51 of the
excitation unit 50L to the soundboard 7 and suppresses the reduction of the sound at the dip
frequency. It is decided to In this example, the frequency of the dip D3 in the frequency
characteristic L corresponds to the frequency of the resonance peak. Also, the frequencies of the
peaks P2 and P3 correspond to the dip frequency. Note that any such dip or peak may not exist
in the frequency characteristic L. Furthermore, in the frequency characteristic L in this example,
similarly to the frequency characteristic H, the frequency characteristic corresponds to the fall of
the high frequency characteristic of the excitation in the excitation unit 50 due to the influence
of the inductance of the voice coil 512. An increase region S2 is set in which the gain of the L
high frequency band is increased. The increase region S2 may not exist. The acoustic signal L has
a state in which the output level at the resonance peak frequency is suppressed by the presence
of the dip D3, and a state in which the output level is reduced at the dip frequency by the
presence of the peaks P2 and P3. Further, due to the presence of the amplification region S2, the
signal is amplified by the amplification unit 153 in a state in which the influence of the
inductance of the voice coil 512 is suppressed, and is input to the excitation unit 50L as the drive
signal L. Thus, the drive signal L is a signal having a frequency characteristic set so as to
suppress the influence of the resonance peak and dip of the soundboard 7 at the connection
position L. Further, even if the output of the high frequency band is reduced due to the influence
of the inductance of the voice coil 512, the reduction can be corrected. The amplification unit
153 may amplify each of the acoustic signals H and L at the same amplification factor, or may
have different amplification factors.
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[0053]
As described above, the vibration units 50H and 50L vibrate in response to the input drive
signals H and L, and vibrate the piece 6 via the soundboard 7. Thereby, the vibration applied to
the piece 6 is also transmitted to the string 5.
[0054]
The frequency characteristic specifying unit 155 specifies a frequency characteristic H and a
frequency characteristic L indicating an adjustment mode of the frequency characteristic with
respect to the drive signal H and the drive signal L performed by the equalizer unit 152. FIG. 9 is
a diagram for explaining a mechanism of the frequency characteristic specifying unit 155
specifying the frequency characteristic H and the frequency characteristic L.
[0055]
For example, when the adjustment worker performs a predetermined operation of supporting the
specification processing of the frequency characteristic on the touch panel 60 before the grand
piano 1 is shipped, the signal output unit 15 outputs an impulse signal as a drive signal to the
excitation unit 50H. . The voice coil 512 of the excitation unit 50 H is strongly driven for a very
short time by the drive signal input from the signal output unit 15, and excites the sounding
board 7 via the connection member 511. After receiving this excitation, the soundboard 7 is hard
at the arrangement position of the excitation unit 50H and vibrates in the same manner as in the
case of one impact.
[0056]
When the soundboard 7 vibrates, the voice coil 512 also vibrates according to the vibration.
When the voice coil 512 disposed on the magnetic path formed by the yoke holding portion 52
vibrates, an electromotive force is generated between both ends of the voice coil 512. A
voltmeter 160 is connected across the voice coil 512 to measure a voltage value generated by
the electromotive force. The voltmeter 160 outputs the voltage value between both ends of the
boil coil 512 generated along with the vibration of the soundboard 7 to the frequency
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characteristic specifying unit 155.
[0057]
The frequency characteristic specifying unit 155 records the voltage values sequentially input
from the voltmeter 160, and the frequency characteristic of the waveform (waveform according
to the vibration of the soundboard 7) indicated by the time-series change of the recorded voltage
value is Identify by known methods. The frequency characteristics specified in this manner
indicate the vibration characteristics at the position (connection position H) where the excitation
unit 50H of the soundboard 7 is connected. The frequency characteristic specifying unit 155 is,
for example, an equalizer so as to raise a component of a frequency band indicating dip and
suppress a component of a frequency band indicating peak according to the frequency
characteristic at the connection position H of the soundboard 7 specified in this way. The section
152 specifies the frequency characteristic H for adjusting the drive signal output to the excitation
section 50H.
[0058]
Subsequently, the signal output unit 15 outputs an impulse signal as a drive signal to the
excitation unit 50L. Thereafter, processing similar to that described above for the excitation unit
50H is performed for the excitation unit 50L. As a result, the frequency characteristic
identification unit 155 identifies the frequency characteristic L for adjusting the drive signal
output from the equalizer unit 152 to the excitation unit 50L. The above is the description of the
functional configuration of the grand piano 1.
[0059]
[Operation Example] Subsequently, an operation example of the grand piano 1 according to the
embodiment of the present invention will be described. First, the user operates the touch panel
60 to set the performance mode as the normal performance mode and set the sound generation
mode as the low sound mode. In this state, when the user operates the key 2 to play, the hammer
40 prevents the hammer 5 from hitting the string 5 while the exciter 50 excites the soundboard
7 and the sound is emitted from the soundboard 7. Be done. Further, by vibrating the piece 6
through the soundboard 7, the string 5 whose vibration is not suppressed by the damper 8 also
vibrates, and sound generation similar to that of the acoustic piano is performed. At this time,
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since the impact of the string 5 by the hammer 4 is blocked by the stopper 40, there is no sound
generation by the string. Therefore, by adjusting the amplitude of the vibration of the excitation
unit 50, the sound effect by the vibration of the soundboard 7 and the resonance of the strings is
made at a volume (or a large volume) smaller than the sound production by striking a string and
like the acoustic piano. It will be possible to use the pronunciation.
[0060]
At this time, the excitation unit 50H excites the soundboard 7 using the drive signal H having a
frequency characteristic set to suppress the influence of the resonance peak and dip of the
soundboard 7 at the connection position H. In addition, the excitation unit 50L excites the
soundboard 7 using the drive signal L having a frequency characteristic set to suppress the
influence of the resonance peak and dip of the soundboard 7 at the connection position L.
Therefore, when the excitation unit 50 is attached to the soundboard, the influence exerted on
the sound quality of the resonance of the soundboard 7 can be controlled so that the sound is not
generated with an unintended sound quality. In addition, since sound can be produced with a
relatively flat frequency characteristic over the entire audible band, it is not necessary to use a
normal speaker that drives and generates a cone paper. As a result, since sound generation is
possible only by vibrating the soundboard 7, it is possible to obtain a natural sound effect
utilizing the sound generation mechanism of the acoustic piano.
[0061]
When the user operates the touch panel 60 to set the sound generation mode as the normal
sound generation mode, the vibration by the vibration unit 50 is not performed, and the hammer
4 does not block the strike of the string 5. Therefore, the sound generation by the stringing is
performed, and the vibration of the string 5 is transmitted to the soundboard 7 through the piece
6. The soundboard 7 emits a sound according to the vibration transmitted from the string 5. At
this time, since only the load of the very light portion of the vibrating portion 50 of the vibrating
portion 50 is applied to the sounding board 7, the vibrating portion 50 almost affects the
vibration characteristics of the sounding board 7 itself. However, the player can play without
losing the acoustic performance of the original acoustic piano.
[0062]
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When the user operates the touch panel 60 to set the sound generation mode as the strong
sound mode, the excitation to the soundboard 7 by the excitation unit 50 and the impact on the
string 5 by the hammer 4 are simultaneously performed. It will be. Therefore, the soundboard 7
radiates a sound by the vibration to which the vibration of the string 5 by the string sent via the
piece 6 and the vibration by the vibration from the vibration unit 50 are added. In addition, the
string 5 struck by the hammer 4 radiates sound by vibration, and the string 5 whose vibration is
not suppressed by the damper 8 vibrates according to the vibration of the soundboard 7 through
the piece 6 to generate resonance sound. It emits. Therefore, the player can play with the sound
naturally mixed with the sound of the original acoustic piano and the sound indicated by the
sound signal output from the sound source unit 151.
[0063]
Although the embodiments of the present invention have been described above, the present
invention can be implemented in various modes as follows. [Modification 1] In the embodiment
described above, the vibrating portion 51 (connection member 511) is separated from the yoke
holding portion 52 by a space, but is indirectly connected to the yoke holding portion 52
(housing 524). May be
[0064]
FIG. 10 is a cross-sectional view of the vibration excitation unit 50A according to the first
modification of the present invention. The excitation unit 50 </ b> B in this example includes a
damper unit 53 that connects the connection member 511 and the housing 524. The damper 53
follows the vertical vibration of the connecting member 511 from the standard position where
the voice coil 512 is not driven by the drive signal and the connecting member 511 does not
apply a force to the sound board 7. In this example, with the connection member 511 not yet
connected to the soundboard 7 and supported by only the damper portion 53, the height at
which the upper surface of the connection member 511 at the standard position just contacts the
lower surface of the soundboard 7 The height of attachment of the excitation unit 50 with
respect to the support 55 is adjusted. Then, the upper surface of the connection member 511
and the lower surface of the soundboard 7 are connected in this state. Therefore, the weight of
the vibration unit 50 does not fall on the soundboard 7 at the standard position. Further,
although the damper portion 53 can support the lightweight vibration portion 51, since the
damper portion 53 has high extensibility, the weight of the yoke holding portion 52 can be
applied to the vibration portion 51 via the damper portion 53 when the soundboard 7 vibrates.
There is almost no transmission, and almost no influence on the vibration characteristics of the
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soundboard 7. Further, since the positional relationship between the vibration unit 51 and the
yoke holding unit 52 is maintained by the presence of the damper unit 53, the operation when
connecting the excitation unit 50A to the soundboard 7 is facilitated.
[0065]
[Modification 2] In the embodiment described above, an example using the grand piano 1 as a
keyboard instrument has been described, but an upright piano may be used.
[0066]
FIG. 11 is a view showing an internal structure of the upright piano 1B in the second
modification of the present invention.
In FIG. 11, to each component of the upright piano 1B, a symbol obtained by adding “B” to a
symbol corresponding to each component of the grand piano 1 in the embodiment is attached.
Also in the case of the upright piano 1B, the vibrating portion 51B in the vibrating portion 50B is
connected to the soundboard 7B, and the yoke holding portion 52 is supported by the support
portion 55B connected to the straight support 9B.
[0067]
FIG. 12 is a diagram for explaining the position of the excitation unit 50B in the second
modification of the present invention. Also in this example, as in the embodiment, the excitation
units 50B (50B1 and 50B2) are connected between the sound rods 75B among the sound boards
7B. Further, the excitation unit 50B is provided at a position corresponding to the piece 6B (in
other words, the back surface of the position at which the piece 6B of the soundboard 7B is
attached). Moreover, in the example shown in FIG. 12, although the support part 55B is
connected to several straight support | pillar 9B, you may be connected to one straight support |
pillar 9B. Although the position where the excitation unit 50B is provided is the position
corresponding to the long piece among the pieces 6B, it may be the position corresponding to the
short piece (not shown). In addition, it may be provided at a position corresponding to each of
the long piece and the short piece. With this configuration, it is possible to drive both pieces
efficiently with desired vibration. Furthermore, one or more excitation units 50B may be installed
at each of the long piece and the short piece, and vibration may be applied to both pieces.
11-05-2019
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[0068]
[Modification 3] In the embodiment described above, the vibration portion 50 is supported by the
support portion 55, so that no load other than the vibration portion 51 is applied to the
soundboard 7, but the vibration portion A load other than 51 may be applied. For example, the
excitation unit 50 may be supported with the support 55 connected to the soundboard 7.
Moreover, the support part 55 may not exist and the vibration excitation part may be directly
attached to the soundboard 7. An example where the support portion 55 is not present will be
described with reference to FIG.
[0069]
FIG. 13 is a view for explaining a state in which the vibration excitation unit 50C according to the
third modification of the present invention is attached to the soundboard 7. The vibration unit
50C has a vibration unit 51C and a connection unit 54C. The vibrating portion 51C is connected
to the soundboard 7 by a connecting portion 54C such as a screw. The vibrating portion 51C has
a weight inside, vibrates the weight according to the input drive signal, and vibrates the
soundboard 7 by the reaction.
[0070]
At this time, since the load of the entire excitation unit 50C is applied to the soundboard 7, the
vibration characteristics of the soundboard 7 may change as it is, but according to the present
invention, the frequency characteristics of the drive signal By setting the frequency characteristic
according to the changed vibration characteristic, the inconvenience is reduced. Further, even
when the sound generation mode is the normal sound generation mode, when the sound quality
changes due to the change of the vibration characteristic as compared with the case where the
vibration excitation unit 50C is not attached, the change of the vibration characteristic is It may
correct | amend by the vibration of 50 C of vibration excitation parts according to. Also, the
configuration may be such that there is no normal sound generation mode.
[0071]
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[Modification 4] In the above-described embodiment, the drive signal is a signal whose frequency
characteristic has been adjusted by the equalizer unit 152. However, the drive signal may not be
a signal adjusted using the equalizer unit 152. . In this case, the sound source unit 151 may
output an acoustic signal H (acoustic signal L) having a frequency characteristic corresponding to
the drive signal H (drive signal L). Then, the acoustic signal H (acoustic signal L) may be
amplified by the amplification unit 153 and output as the drive signal H (drive signal L).
[0072]
[Modification 5] In the embodiment described above, the drive signal H (drive signal L) has dips
and peaks at the resonance peak and dip frequencies of the soundboard 7 at the connection
position H (connection position L). Although the signal has the frequency characteristic set to, it
may be a signal having the frequency characteristic set such that dips and peaks exist at other
frequencies. The presence of the dip and the peak other than the frequency of the resonance
peak makes it possible to produce sounds with various tones. About the frequency characteristic
which combined such dip and peak, the data which show the pattern of these combination are
stored beforehand in storage part 12, and the user operates touch panel 60 etc. and sets it as the
frequency characteristic of a drive signal. It may be configured to be able to select a desired
pattern. Also, the pattern of the combination of dip and peak may be determined by the user and
stored in the storage unit 12 as a new template. The frequency characteristics of the drive signal
H and the frequency characteristics of the drive signal L may have different patterns of
combinations of dips and peaks.
[0073]
Further, the drive signal is not limited to the case where the resonance of the soundboard 7 is
suppressed, and may be a signal having a frequency characteristic set so as to strongly generate
the resonance. In this case, the drive signal does not have to be dip at the frequency of the
resonance peak of the soundboard 7, but may be a signal having a frequency characteristic set so
that the peak exists. Further, the drive signal may be a signal having a frequency characteristic
set so that a dip does not exist, but a peak exists at the dip frequency in the soundboard 7. The
frequency characteristic of the drive signal H is set to have a dip at the frequency of the
resonance peak as in the embodiment, and the frequency characteristic of the drive signal L is set
to have a peak at the frequency of the resonance peak. It may be
[0074]
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Thus, the drive signal input to each of the plurality of excitation units 50 corresponds to the
vibration characteristic of the soundboard 7 at the position where the vibration unit 51 of the
excitation unit 50 to which the drive signal is input is connected. Any signal may be used as long
as it has a frequency characteristic.
[0075]
[Modification 6] In the embodiment described above, the frequency characteristics of the drive
signal H (drive signal L) have dips and peaks at the resonance peak and dip frequency of the
soundboard 7 at the connection position H (connection position L). Although it was previously
set to exist, when the attachment position of the excitation unit 50H (the excitation unit 50L) is
changed, the frequency and the magnitude (hereinafter referred to as setting parameters) of this
dip and peak can be changed. May be
The setting parameter may be set by the user operating the touch panel 60 or the like to specify
the setting parameter. In addition, the user operates the touch panel 60 or the like to designate
the attachment position (such as the coordinates on the soundboard 7) of the excitation unit 50,
whereby the control unit 11 represents the vibration characteristics of the soundboard 7 set in
advance. The setting parameter to be set may be calculated based on the information (for
example, an arithmetic expression indicating the relationship between the coordinates of the
soundboard 7 and the vibration characteristic).
[0076]
[Modification 7] In the above-described embodiment and its modification, the excitation unit is
provided at a position corresponding to the piece in the soundboard, but may be a position apart
from the piece.
[0077]
FIG. 14 is a diagram showing an example in which the upright piano 1B according to the second
modification shown in FIG. 11 is modified, and the excitation unit 50B is disposed at a position
away from the piece 6B of the soundboard 7B.
In the example shown in FIG. 14, the two excitation units 50B are disposed at positions (back
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side of the sounding board 7B in FIG. 14) opposite to the sounding bar 75B with the sounding
board 7B interposed therebetween.
[0078]
FIG. 15 is a view showing how the excitation unit 50B shown in FIG. 14 is supported by the
support unit 55B. As the cross section is shown in FIG. 15, the supporting portion 55B of this
modification is made by bending a plate made of stainless steel or the like at two different
longitudinal directions along the lines perpendicular to the longitudinal direction by 90 degrees
in opposite directions. It has a shape. The flat portion constituting one end of the support portion
55B is attached to the back surface of the shelf plate 90 of the upright piano 1B by screwing or
the like. The yoke holding part 52B of the vibration excitation part 50B is attached to the plane
part which comprises one end part of the support part 55B. The yoke holding portion 52B is
disposed at a position facing the sounding rod 75B with the sounding plate 7B interposed
therebetween, and accommodates the vibrating portion 51B connected to the sounding plate 7B
at that position.
[0079]
Even in the configuration in which the excitation unit is connected to the soundboard at the
position corresponding to the live bar instead of the piece as in the above example, the excitation
by the exciter is efficiently transmitted to the entire soundboard by the live rod. The desired
sound may be emitted by the soundboard.
[0080]
Also, attach a vibrating rod, which is a rod-like member different from the sounding rod, on the
surface of the soundboard opposite to the sounding rod, for example, and place the vibrating
portion at a position opposite to the vibrating rod with the sounding plate interposed.
Arrangements for deployment may be employed.
In this case, since the exciter can be designed separately from the existing bridge and the
sounding bar, the exciter may be designed so that the sound of desired acoustic characteristics is
emitted from the soundboard according to the excitation of the exciter. It is desirable that the
shape, size, arrangement position, etc. of the
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[0081]
Furthermore, as long as the desired sound is emitted, a configuration may be adopted in which
the excitation unit is disposed at a position not corresponding to any of the bridge, the live bar,
and the exciter bar of the soundboard.
[0082]
[Modification 8] In the above-described embodiment, the yoke holding unit 52 generates the
magnetic force using the magnet 522, but the configuration does not vibrate the vibrating unit
51 using a configuration such as an electromagnet that can control the presence or absence of
the magnetic force. When the sound generation mode is the normal sound generation mode, for
example, the generation of the magnetic force may be stopped.
[0083]
[Modification 9] In the above-described embodiment, the excitation unit 50 includes the vibration
unit 51 and the yoke holding unit 52, and is realized by a configuration close to a dynamic type
speaker using a voice coil, It may be realized by the configuration of
For example, the vibrating portion 51 is formed of a sheet-like magnetic material and is attached
to the soundboard 7.
On the other hand, the configuration corresponding to the yoke holding portion 52 supported by
the support portion 55 may be configured to have an electromagnet that controls the strength
and polarity of the magnetic force based on the drive signal. The vibrating portion 51 may excite
the sounding board 7 by the attractive force and the repulsive force generated by the change of
the magnetic force.
[0084]
[Modification 10] In the embodiment described above, the support 55 supports the vibration
excitation unit 50 in the state of being connected to the straight support 9, but in the state of
being connected to a place other than the straight support 9. It may be. For example, the support
portion 55 may support the excitation portion 50 in a state of being connected to a side plate, a
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leg or the like of the grand piano 1. In addition, even if the support portion 55 is connected to a
portion different from the grand piano 1, for example, a structure (floor, wall, etc.) of a room in
which the grand piano 1 is installed, the support portion 55 may support the vibration excitation
portion 50. Good.
[0085]
[Modification 11] The control program in the embodiment described above is a computer
readable recording medium such as a magnetic recording medium (magnetic tape, magnetic disk,
etc.), an optical recording medium (optical disc, etc.), a magneto-optical recording medium, a
semiconductor memory, etc. It can be provided in a stored state. Also, the grand piano 1 may
download the control program via the network.
[0086]
[Modification 12] In the embodiment described above, a cylindrical shape having a diameter
substantially the same as the diameter of the voice coil 512 is adopted as the shape of the
connection member 511, but the shape of the connection member 511 is limited to this. Absent.
FIG. 16 is a view showing an example of an excitation unit according to the present invention
having a connecting member 511 having a non-cylindrical shape. The connection member 511
of the excitation unit 50 shown in FIG. 16 has a hollow cylindrical main body 5111 whose upper
surface is closed and whose lower surface is open, and the lower surface of the main body 5111
extends upward from the center of the upper surface. It has a cylindrical support rod 5112
attached to the top surface of the portion 5111. The upper surface of the support rod 5112 is
connected to the lower surface of the soundboard 7, and the upper surface of the support rod
5112 excites the soundboard 7.
[0087]
According to the excitation unit 50 having the connecting member 511 having the shape shown
in FIG. 16, for example, the sounding rod 75 is disposed near a desired position (for example, a
position according to the piece 6) on the soundboard 7 where the excitation unit 50 is to be
arranged. Even if the shape of the connecting member 511 according to the above-described
embodiment interferes with the sounding rod 75, the connection to the sounding plate 7 as long
as the support rod 5112 does not interfere with the sounding rod 75. The connection of the
members 511 can be made.
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29
[0088]
[Modification 13] In the embodiment described above, in order to specify the frequency
characteristic H and the frequency characteristic L that indicate the adjustment mode of the drive
signal performed by the equalizer unit 152, the signal output unit 15 includes the excitation unit
50H and the excitation. A configuration is employed in which an impulse signal is output as a
drive signal to the unit 50L, and the excitation unit 50H and the excitation unit 50L perform
excitation on the soundboard 7 according to the impulse signal.
The drive signal that the signal output unit 15 outputs to the excitation unit 50H and the
excitation unit 50L is not limited to the impulse signal, and outputs another waveform signal
such as a TSP (Time Streched Pulse, Sweep Sine) signal as a drive signal, for example.
Configurations may be employed.
[0089]
However, when a signal such as a TSP signal is output to the excitation unit 50H and the
excitation unit 50L for a long time as compared to an impulse signal, the soundboard 7 vibrates
due to the excitation according to the leading portion of the signal. The subsequent portion of the
signal will cause an excitation. In that case, it is sufficient to remove the influence component due
to the excitation to the waveform according to the vibration of the soundboard 7 by processing
such as subtracting the waveform indicated by the drive signal from the waveform indicated by
the voltage value.
[0090]
Also, in order to specify the frequency characteristic H and the frequency characteristic L
indicating the adjustment mode of the drive signal performed by the equalizer unit 152, the
excitation to the soundboard 7 according to the impulse signal etc. by the excitation unit 50H
and the excitation unit 50L. Instead, for example, an adjustment worker or the like strikes the
sounding board 7 at the connection position H and the connection position L using a hammer or
the like (a tool that does not damage the sounding board 7 by impact), and the resulting vibration
of the sounding board 7 A configuration may be employed in which the frequency characteristic
identification unit 155 processes the corresponding voltage value.
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[0091]
Modified Example 14 In the embodiment and the modified example described above, a piano is
adopted as an example of a keyboard percussion instrument.
The present invention can also be applied to, for example, keyboard percussions other than
pianos such as a celesta having a sound board made of metal as a sounding body instead of a
string.
[0092]
DESCRIPTION OF SYMBOLS 1 ... Grand piano, 1B ... Upright piano, 2, 2B ... Key, 3, 3B ... Pedal, 4,
4B ... Hammer, 5, 5B ... String, 6, 6B, 6H, 6L ... piece, 7, 7B ... sound Board, 8, 8B: Damper, 9:
Direct support, 9B: Direct support, 10: Control device, 11: Control unit, 12: Storage unit, 13:
Operation panel, 14: Communication unit, 15: Signal output unit, 16 ... interface 22, 22 B ... key
sensor 23, 23 B ... pedal sensor 24, 24 B ... hammer sensor 30, 30 B ... key drive unit 40, 40 B ...
stopper, 50, 50 A, 50 B, 50 C, 50 H, 50 L ... Vibrating part, 51, 51B, 51C ... Vibrating part, 511 ...
Connecting member, 512 ... Voice coil, 52, 52B ... Yoke holding part, 521, 523 ... Yoke, 522 ...
Magnet, 524 ... Housing, 53 ... Damper part , 54 ... connection portion 55 55 B support portion
60 touch panel 75 sounding bar 110 setting portion 120 performance information output
portion 130 blocking control portion 151 sound source portion 152 equalizer portion 153:
amplification part, 155: frequency characteristic identification part, 160: voltmeter
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