JP2007096690

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DESCRIPTION JP2007096690
An object of the present invention is to make it possible to easily generate musical tones of good
sound quality. A sound diaphragm 21 is provided above the keyboard 8 and speakers 16 a and
16 b are provided below the keyboard 8. As a result, at a position close to the performer's ear,
the sound produced by the vibration of the acoustic diaphragm 21 and the sound transmitted by
the vibration being transmitted to the portion connected to the acoustic diaphragm 21 With the
musical tone, it is possible to produce a musical tone close to the vibration sound generated by
the sound board of the acoustic piano. On the other hand, at a position close to the performer's
foot, the acoustic piano is pronounced by the musical tone generated from the speaker 16 and
the musical tone generated by propagating the vibration of the speaker 16 to the portion
connected to the speaker 16. A musical tone close to the reflected sound from the floor of the
musical tone can be generated. [Selected figure] Figure 2
Tone generator
[0001]
The present invention relates to a tone generator, and is particularly suitable for vibrating a
sound diaphragm to produce a tone.
[0002]
2. Description of the Related Art Conventionally, in electronic musical instruments, musical tones
are produced using loudspeakers provided with point sound sources.
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However, when a tone is produced using this loudspeaker, a player or an audience will hear the
tone produced from a limited position. Therefore, it has been difficult to produce a tone that
mimics the tone produced by an acoustic piano using a loudspeaker. Therefore, an electronic
musical instrument has been proposed in which a sound diaphragm is provided and the sound
diaphragm is vibrated to generate musical tones.
[0003]
However, since the acoustic piano has a large and complicated structure, it is difficult to generate
a musical tone close to that of the acoustic piano only by vibrating the acoustic diaphragm. The
present invention has been made in view of such problems, and it is an object of the present
invention to make it possible to generate musical tones close to acoustic musical instruments.
[0004]
The musical tone generating apparatus according to the present invention comprises a
performance operation element operated by a performer to perform a performance, a surface
sound source speaker provided above the performance operation element and having a surface
sound source, and the performance operation element. And a point sound source speaker
provided with a point sound source, and the surface sound source speaker is attached to an
acoustic diaphragm provided above the performance operator, and the acoustic diaphragm And a
vibrating element for vibrating the acoustic diaphragm based on a musical tone signal.
[0005]
According to the present invention, the surface sound source speaker is provided above the
performance operator and the point sound source speaker is provided below the performance
operator. Therefore, the surface sound source is generated by the surface sound source near the
performer's ear. A musical tone close to the vibration sound produced by the sound board of the
acoustic musical instrument can be produced by the musical tone.
At a position close to the performer's foot, the musical tone generated by the point sound source
can produce a musical tone close to the reflection from the floor of the musical tone generated
from the acoustic musical tone. Therefore, it is possible to generate musical tones close to
acoustic instruments.
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[0006]
First Embodiment Next, a first embodiment of the present invention will be described with
reference to the drawings. In the present embodiment, the case where the tone generation device
is an electronic musical instrument will be described as an example. FIG. 1 is a block diagram
showing an example of a schematic configuration of an electronic musical instrument. In FIG. 1,
an electronic musical instrument 100 includes a central processing unit (hereinafter referred to
as a CPU) 1, a flash memory 2, a random access memory (hereinafter referred to as a RAM) 3, an
external storage medium attachment unit 4, and an external unit. The output interface unit 5, the
signal bus 6, the key scan circuit 7, the keyboard 8, the panel scan circuit 9, the operation panel
10, the musical tone generation unit 11, the waveform flash memory 12, and the signal
processing unit 13 A digital / analog converter (hereinafter referred to as a D / A converter) 14, a
power amplifier 15, a speaker 16, and a vibrating element 17.
[0007]
As shown in FIG. 1, CPU 1, flash memory 2, RAM 3, key scan circuit 7, panel scan circuit 9, tone
generation unit 11, external storage medium attachment unit 4, and external input / output
interface unit 5 respectively have signal buses. 6 and can communicate with each other.
[0008]
(Keyboard) The keyboard 8 has a plurality of keys and a plurality of key switches provided
corresponding to each of the plurality of keys.
The user of the electronic musical instrument performs a desired performance by depressing and
releasing the keys. (Key Scan Circuit) The key scan circuit 7 is for performing scan processing of
each key switch of the keyboard 8.
[0009]
(Operation Panel) The operation panel 10 has various operators and a display device. In the
electronic musical instrument of the present embodiment, for example, an LCD (Liquid Crystal
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Display) is provided as a display device. The LCD displays the selection state and setting state of
various operators. For example, a power switch for supplying power to the electronic musical
instrument, a reset switch for resetting the setting state of the electronic musical instrument to
an initial value, a dial for setting the tempo or volume, a timbre A tone color selection switch or
the like is provided to make a selection. However, it goes without saying that the operators are
not limited to these.
[0010]
(Panel Scan Circuit) The panel scan circuit 9 is for performing scan processing of various
operators provided on the operation panel 10. (CPU) The CPU 1 is to control the whole of the
electronic musical instrument according to the present embodiment, for example, while using the
RAM 3 as a work memory according to a control program stored in the flash memory 2 Do the
processing.
[0011]
The CPU 1 inputs the result scanned by the panel scan circuit 9 and identifies the operation
content of the operation panel 10. Further, the CPU 1 inputs the result scanned by the key scan
circuit 7 and identifies the operation content of the key (key depression and key release). Then,
processing of assigning performance data based on the operation content of the key (key
depression and key release) or data based on the operation content of the operation panel 10 to
the tone generation unit 11 is performed.
[0012]
The performance data includes a key on / off signal indicating whether the operation of each key
is key depression (key on) or key release (key off), a pitch as pitch data, and a velocity as volume
control data. It comprises data, tempo information indicating the absolute value of the
performance tempo (hereinafter referred to simply as tempo information as necessary), and a key
touch response signal relating to the operation speed of each key. It goes without saying that the
CPU 1 performs various processes in addition to those described above.
[0013]
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(Flash Memory) The flash memory 2 is a readable memory, and stores various data in addition to
the control program of the CPU 1.
[0014]
(RAM) The RAM 3 is a readable / writable memory, and has a storage area for temporarily
storing various necessary data in the program execution process of the CPU 1 and storing
editable parameter data.
A part or all of the RAM 3 is backed up by a battery so that necessary data can be held even
when the power of the electronic musical instrument is turned off.
[0015]
(External Storage Device Mounting Unit) The external storage medium mounting unit 4 is, for
example, a CD-RW drive. Then, the CPU 1 reads out the control program and various data stored
in the CD-ROM mounted in the CD-RW drive and performs necessary processing. Needless to say,
the external storage medium loading unit 4 is not limited to the CD-RW drive, and may be a
flexible disk (FD) device, a magneto-optical disk (MO) device, or the like.
[0016]
(External I / O Interface Unit) The external I / O interface unit 5 is for exchanging data such as
performance information with an external device. Specifically, the external input / output
interface unit 5 is, for example, MIDI (Musical Instrument Digital Interface).
[0017]
(Waveform Memory) The waveform memory 12 stores various tone waveform data
corresponding to the tone color and the tone range. In the present embodiment, the waveform
memory 12 stores tone waveform data based on sound collection data acquired (collected) above
the acoustic grand piano. (Music Tone Generation Unit) The tone generation unit 11 reads out
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necessary tone waveform data from the waveform memory 12 based on the performance data
assigned by the CPU 1 as described above and data based on the operation content of the
operation panel 10. , Generate digital tone signals. In the electronic musical instrument 100 of
this embodiment, a stereo signal is generated. Therefore, the tone generation unit 11 generates a
digital tone signal for the right channel and a digital tone signal for the left channel.
[0018]
(Signal Processing Unit) The signal processing unit 13 has a function of performing processing
including delay processing, volume correction processing, frequency correction processing,
phase correction processing, and sound image processing on the digital musical tone signal
generated by the musical tone generating unit 11. Have. These processes are performed based on
the distance from the speaker 16 or the acoustic diaphragm 21 to the performer. In addition to
this, the signal processing unit 13 also has a function of performing filter processing (noise
removal processing), sound quality adjustment, signal level (gain) adjustment, and the like.
[0019]
(D / A Converter) The D / A converter 14 has a function of converting the digital tone signal
processed by the signal processing unit 13 into an analog tone signal.
[0020]
(Power Amplifier) The power amplifier 15 amplifies the analog tone signal D / A converted by
the D / A converter 14 to an appropriate level by amplification processing.
(Speaker) The speaker 16 is for generating an analog musical tone signal amplified by the power
amplifier 15 as an audible signal. The speaker 16 has a point sound source, and is specifically,
for example, a cone speaker. Further, in the present embodiment, as shown in FIG. 2, there are
two speakers, a speaker 16 a for the right channel and a speaker 16 b for the left channel, and
these two speakers 16 a and 16 b are located below the keyboard 8. In the position substantially
facing the performer.
[0021]
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(Vibrating Element) As shown in FIG. 2, the acoustic diaphragm 21 provided above the keyboard
8 at a position substantially facing the player is amplified by the power amplifier 15 as shown in
FIG. It vibrates based on the analog tone signal. Specifically, the vibrating element 17 includes a
so-called moving coil, has an inductive impedance, and vibrates the acoustic diaphragm 21 by the
action of the electromagnetic force. As described above, in the present embodiment, the speaker
of the surface sound source that generates the musical tone by the vibration of the acoustic
diaphragm 21 by the vibration element 17 is formed.
[0022]
As described above, the electronic musical instrument 100 of this embodiment generates a stereo
signal. Therefore, based on the musical tone signal for the right channel, the vibrating element
17a for vibrating the acoustic diaphragm 21 and the vibrating element for vibrating the acoustic
diaphragm 21 based on the musical tone signal for the left channel. 17 b are connected in
parallel and provided in the electronic musical instrument 100. The two vibration elements 17a
and 17b have the same configuration, and are attached to the acoustic diaphragm 21 using, for
example, an adhesive. The acoustic diaphragm 21 is formed using, for example, a spruce (wood)
plate.
[0023]
FIG. 3 shows an example of the distribution of sound pressure gradients generated by the tones
produced from the speakers 16a and 16b. FIG. 4 shows an example of the distribution of the
sound pressure gradient produced by the musical tone generated from the acoustic diaphragm
21. As shown in FIG. FIG. 5 shows an example of the distribution of sound pressure gradients
generated by musical tones generated from an acoustic grand piano. The distributions of sound
pressure gradients shown in FIGS. 3 to 5 are all created based on data measured at the same
place. Further, in FIGS. 3 to 5, the thicker the line, the larger the sound pressure, and the solid
line indicates that the sound pressure is larger than the broken line. As shown in FIGS. 3 and 4,
the distribution of sound pressure gradients generated by the musical tones generated from the
electronic musical instrument 100 of the present embodiment has two large sound pressure
gradients and is generated from the grand piano shown in FIG. It can be seen that the
distribution approximates to the distribution of sound pressure gradients generated by musical
tones.
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[0024]
As described above, in the present embodiment, the acoustic diaphragm 21 is provided above the
keyboard 8 and the speakers 16 a and 16 b are provided below the keyboard 8, so the position
close to the performer's ear In the position where the sound is transmitted to the ear of the
player without reflection, the sound produced by the vibration of the acoustic diaphragm 21 and
the vibration transmitted to the portion connected to the acoustic diaphragm 21). A musical tone
close to the vibration sound produced by the acoustic piano sound board can be produced by the
sounded tone (by the musical tone generated by the surface sound source). On the other hand, at
a position close to the performer's foot (a position where the musical tone is reflected somewhere
and then transmitted to the performer's ear), the musical tone generated from the speaker 16
and the vibration of the speaker 16 are connected to the speaker 16 A musical tone close to that
reflected from the floor of the acoustic piano can be produced by the musical tone generated by
propagation to the part (by the musical tone generated by the point sound source).
[0025]
In the present embodiment, a digital musical tone signal is generated based on musical tone
waveform data based on data collected above the acoustic grand piano, and delay processing and
volume (sound pressure) are performed on the digital musical tone signal. Since processing
including correction processing, frequency correction processing, phase correction processing,
and sound image processing is performed, even if data of a reflected sound from the floor of a
musical tone generated from an acoustic grand piano is not acquired, the data is , And can be
generated based on sound collection data acquired above the acoustic grand piano. As a result, it
is possible to reduce the number of tone generator devices (tone generation units), tone
waveform data, and processing circuits.
[0026]
In the present embodiment, the vibration elements 17a and 17b have the same configuration, but
the total mass of the vibration elements 17a and 17b is substantially the same as the mass of the
acoustic diaphragm 21. If it exists, the vibrating elements 17a and 17b may not have the same
configuration. For example, the vibrating elements 17a and 17b may have different sizes and
shapes.
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[0027]
Although the case where the number of the vibrating elements 17 attached to the acoustic
diaphragm 21 is two has been described as an example, the number of the vibrating elements 17
attached to the acoustic diaphragm 21 may be any number. Good.
[0028]
Furthermore, as in the present embodiment, if the acoustic diaphragm 21 is formed using a
spruce (wood) plate made of the same material as the acoustic piano sound board, the tone closer
to the acoustic piano can be reproduced. Although it is preferable, the acoustic diaphragm 21 is
not limited to a spruce (wood) plate.
For example, the acoustic diaphragm 21 may be made of metal, casting or the like.
[0029]
Further, in the present embodiment, the acoustic diaphragm 21 is vibrated based on the musical
tone signal generated by the musical tone generation unit 11 of the electronic musical
instrument 100. However, various musical tones such as musical tone signals generated by the
CD player The acoustic diaphragm can be vibrated based on the signal.
[0030]
Further, in this embodiment, processing including delay processing, volume correction
processing, frequency correction processing, phase correction processing, and sound image
processing is performed, and a musical tone close to the reflected sound from the floor of the
musical sound produced from the acoustic grand piano. In place of or in addition to these
processes so that the sound emitting surface (i.e., the front surface) of the speakers 16a and 16b
is directed toward the floor. A musical tone close to the reflected sound from the floor of the
musical tone may be generated.
[0031]
Further, it is preferable that the mass of the acoustic diaphragm 21 and the sum of the masses of
the vibrating elements 17a and 17b be substantially equal.
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It is possible to reduce the loss when propagating the vibration from the two vibration elements
17a and 17b to the acoustic diaphragm 21, to obtain a good acoustic output in a wide frequency
band, and to obtain an acoustic grand piano It is because it can be made to have a high sound
pressure gradient in a wide range similarly.
[0032]
Second Embodiment Next, a second embodiment of the present invention will be described.
In the first embodiment described above, D / A conversion is performed after processing
including delay processing, volume correction processing, frequency correction processing,
phase correction processing, and sound image processing on digital musical tone signals. . In the
present embodiment, on the other hand, digital tone signals are subjected to D / A conversion,
and then processing including delay processing, volume correction processing, frequency
correction processing, phase correction processing, and sound image processing is performed. .
As described above, the present embodiment and the first embodiment described above only
differ in part of the signal processing. Therefore, in the following description, the same parts as
those in the first embodiment described above will be described with reference to FIG. The
detailed description will be omitted by assigning the same reference numerals as the reference
numerals given in FIG.
[0033]
FIG. 6 is a block diagram showing an example of a schematic configuration of the electronic
musical instrument. In FIG. 6, the electronic musical instrument 200 includes a CPU 1, a flash
memory 2, a RAM 3, an external storage medium mounting unit 4, an external input / output
interface unit 5, a signal bus 6, a key scan circuit 7, and a keyboard 8. , Panel scan circuit 9,
operation panel 10, tone generation unit 11, waveform flash memory 12, D / A conversion unit
61, analog signal processing unit 62, power amplifier 15, speaker 16, vibration And an element
17.
[0034]
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(D / A Converter) The D / A converter 61 has a function of converting the digital tone signal
generated by the tone generator 11 into an analog tone signal. (Analog Signal Processing Unit)
The analog signal processing unit 62 performs delay processing, volume correction processing,
frequency correction processing, phase correction processing, and sound image processing on an
analog tone signal D / A converted by the D / A conversion unit 13. Have a function to perform
processing including These processes are performed based on the distance from the speaker 16
or the acoustic diaphragm 21 to the performer. In addition to this, the analog signal processing
unit 62 also has a function of performing filter processing (noise removal processing), sound
quality adjustment, signal level (gain) adjustment, and the like.
[0035]
As described above, even if processing including delay processing, volume correction processing,
frequency correction processing, phase correction processing, and sound image processing is
performed after D / A conversion, according to the first embodiment described above. Although
the configuration is complicated, as in the first embodiment described above, it is possible to
generate musical tones close to an acoustic piano.
[0036]
Third Embodiment Next, a third embodiment of the present invention will be described.
In the first and second embodiments described above, the speakers 16a and 16b are provided in
the speaker box in which only the portions to which the speakers 16a and 16b are attached are
open. On the other hand, in the present embodiment, the speakers 16a and 16b are provided on
the back load horn. As described above, the first and second embodiments described above are
mainly different from the first and second embodiments only in the configuration of the speaker
box that accommodates the speakers 16a and 16b. The same parts as those in FIGS. 1 to 6 are
denoted by the same reference numerals as those in FIGS.
[0037]
As shown in FIG. 7, in the electronic musical instrument 300 according to the present
embodiment, the tone emitted from the back of the speakers 16a and 16b is produced from the
front of the electronic musical instrument 300 (below the sound emitting surface of the speakers
16a and 16b). The back load horn 71 is provided. As a result, high and medium tones can be
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generated from the sound emission surface of the speakers 16a and 16b, and low tones can be
generated from the back load horn 71. Therefore, in the present embodiment, in addition to the
effects described in the first and second embodiments, delay processing and volume correction
are performed in the signal processing unit 13 shown in FIG. 1 and the analog signal processing
unit 62 shown in FIG. Even if processing, frequency correction processing, phase correction
processing, and sound image processing are not performed, it is possible to produce an effect
that it is possible to generate a musical tone close to the reflected sound from the floor of the
musical tone generated from the acoustic piano.
[0038]
However, if delay processing, volume correction processing, frequency correction processing,
phase correction processing, and sound image processing are performed by the signal processing
unit 13 or the analog signal processing unit 62 shown in FIG. 6, musical tones generated from an
acoustic piano It is needless to say that it is possible to generate a closer musical tone by the
reflection sound from the floor of.
[0039]
The number, position, and configuration of back load horns are not limited to those shown in FIG.
For example, as shown in FIG. 8, two backload horns 81a and 81b are provided at corners of an
electronic musical instrument below the keyboard 8, and the front faces of the two backload
horns 81a and 81b are The electronic musical instrument 400 may be configured to face in the
diagonal direction. In such back load horns 81a and 81b, musical tones emitted from the back of
the speakers 16a and 16b are produced from the side of the sound emitting surface of the
speakers 16a and 16b.
[0040]
Fourth Embodiment Next, a fourth embodiment of the present invention will be described. In the
third embodiment described above, the back load horns 71 and 81 are provided to cause the
musical tones output from the back of the speakers 16 a and 16 b to be emitted from the front of
the electronic musical instrument 300. On the other hand, in the present embodiment, musical
tones are generated downward from the speaker 16 in the speaker box, and the musical tones
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generated are diffused by the diffuser and generated to the side of the electronic musical
instrument. As described above, the third embodiment described above is different from the third
embodiment described above mainly in only a part of the configuration when the tone sounds are
generated from the speakers 16a and 16b. About the part same as a form, the detailed
explanation is omitted by attaching the same numerals as the numerals attached to Drawings 1-8.
[0041]
As shown in FIG. 9, in the electronic musical instrument 500 of this embodiment, the speakers
16a and 16b mounted in the speaker box 91 with the sound emitting surface (i.e., the front
surface) facing downward and the sound emission of the speakers 16a and 16b. It has diffusers
92a and 92b attached at positions facing the surface. The diffusers 92a and 92b are formed of,
for example, iron, wood, plastic, or the like in the shape of a triangular pyramid. The musical
tones generated from the speakers 16a and 16b are diffused by the spreaders 92a and 92b. The
musical tones diffused by the diffusers 92a and 92b propagate to the opening portions formed
on the front and back surfaces of the speaker box 91, and are emitted from the openings toward
the outside.
[0042]
As described above, in the present embodiment, the tone is generated downward from the
speaker 16 in the speaker box, and the generated tone is diffused by the spreader 92 and
generated to the side of the electronic musical instrument 500. In addition to the effects
described in the first to third embodiments, musical tones close to the reflected sound from the
floor of musical tones generated from an acoustic piano can be used by an audience other than
the player (for example, on the back side of the electronic musical instrument 500). The effect is
that you can listen to the
[0043]
Fifth Embodiment Next, a fifth embodiment of the present invention will be described.
In the first to fourth embodiments described above, the tone generation is performed such that
the vibration of the sound emitting surface of the speaker 16 is transmitted to the air as it is. On
the other hand, in the present embodiment, the vibration of the sound emitting surface of the
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speaker 16 is transmitted to the plate material, and the vibration of the plate material is
transmitted to the air to emit the musical tone. As described above, since the present
embodiment and the above-described first to fourth embodiments mainly differ only in part of
the configuration when the musical tone is generated from the speaker 16, the above-described
first to fourth embodiments are described. About the part same as embodiment, the detailed
description is abbreviate ¦ omitted by attaching the code ¦ symbol same as the code ¦ symbol
attached ¦ subjected to FIGS.
[0044]
As shown in FIG. 10, in the electronic musical instrument 600 of the present embodiment, the
speaker 16 is mounted so that the sound emission surface faces the front of the speaker box
103, and the electronic musical instrument 600 is attached to the opening of the front of the
speaker box 103 The lower front plate 102, the sound emitting surface of the speaker 16, and
the vibration propagation parts 101a to 101j attached between the lower front plate 102.
[0045]
The lower front plate 102 is for generating a musical tone by the vibration propagated from the
speaker 16 via the vibration propagation parts 101a to 101j.
The lower front plate 102 is made of a wood plate such as synthetic wood or spruce. As
described above, in the present embodiment, the speaker of the surface sound source that
generates the musical tone by the vibration of the lower front plate 102 is formed. The vibration
propagation units 101 a to 101 j are for propagating the vibration generated on the sound
emission surface of the speaker 16 in the surface direction of the lower front plate 102. The
vibration propagation unit 101a is made of, for example, a hollow cylindrical iron. The size of the
hollow cylindrical iron constituting the vibration propagation part 101 a is appropriately
determined in accordance with the size of the sound emitting surface of the speaker 16. On the
other hand, the vibration propagation parts 101b to 101j are made of rectangular solid iron. The
length of the rectangular parallelepiped shaped iron which comprises vibration propagation
parts 101b-101j is suitably determined according to the size of lower front board 102. As shown
in FIG.
[0046]
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As described above, since the iron vibration propagating portions 101a to 101j are provided
between the sound emitting surface of the speaker 16 and the lower front plate 102, the
vibration generated on the sound emitting surface of the speaker 16 can be as close as possible.
It is possible to rapidly propagate the entire surface of the lower front plate 102 and to generate
musical tones based on metal vibrations similar to musical tones based on vibrations of an
acoustic piano frame. Therefore, it is possible to easily generate a musical tone close to the
reflected sound from the floor of the musical tone generated from the acoustic piano.
[0047]
In addition, although the case where the number of the speakers 16 is one was mentioned as an
example and demonstrated in this embodiment, the number of the speakers 16 is not limited to
one, Any number may be sufficient. Further, the number of vibration propagation units 101 is
not limited to ten, and may be any number. Furthermore, if the vibration propagating portion
101 is made of iron, the vibration generated on the sound emitting surface of the speaker 16 can
be propagated to the entire surface of the lower front plate 102 as quickly as possible, and the
musical tone based on the metal vibration is Although it is preferable because it can be
generated, the vibration propagation unit 101 may not be made of iron. For example, the
vibration propagation unit 101 may be made of spruce. Also, the lower front plate 102 is not
limited to wood. In the present embodiment, since the vibration generated by the sound emitting
surface of the speaker 16 can be sufficiently transmitted to the lower front plate 102 by the
vibration propagation unit 101, the expensive wood such as spruce is not used. Even if
inexpensive wood such as Lauan wood is used, musical tones can be generated without
significantly reducing the sound quality.
[0048]
The embodiments described above are merely examples of the implementation of the present
invention, and the technical scope of the present invention should not be interpreted in a limited
manner by these. That is, the present invention can be implemented in various forms without
departing from the technical idea or the main features thereof.
[0049]
FIG. 1 is a block diagram showing a first embodiment of the present invention and showing an
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example of a schematic configuration of an electronic musical instrument. FIG. 2A is a front view
of the electronic musical instrument according to the first embodiment of the present invention,
and FIG. 2B is a cross-sectional view taken along the line A-A ′ of FIG. It is the sectional view
seen from. FIG. 2 is a diagram showing a first embodiment of the present invention and showing
an example of a distribution of sound pressure gradients generated by musical tones generated
from a speaker. FIG. 2 is a view showing a first embodiment of the present invention and
showing an example of a distribution of sound pressure gradients generated by musical tones
generated from a sound diaphragm. FIG. 1 is a diagram showing a first embodiment of the
present invention and showing an example of a distribution of sound pressure gradients
generated by musical tones generated from an acoustic grand piano. FIG. 8 is a block diagram
showing a second embodiment of the present invention and illustrating an example of a
schematic configuration of an electronic musical instrument. The 3rd Embodiment of this
invention is shown and it is the figure which showed an example of schematic structure of an
electronic musical instrument, FIG. 7 (a) is a front view, FIG.7 (b) is B-B 'of FIG. 7 (a). It is the
sectional view seen from. FIG. 8 shows the third embodiment of the present invention and shows
another example of the schematic structure of the electronic musical instrument, and FIG. 8 (a) is
a front view, and FIG. 8 (b) is a C-- FIG. It is sectional drawing seen from C '. FIG. 9 shows the
fourth embodiment of the present invention and shows another example of the schematic
structure of the electronic musical instrument, and FIG. 9 (a) is a front view, and FIG. 9 (b) is a Dof FIG. 9 (a). It is sectional drawing seen from D '. FIG. 10 shows the fifth embodiment of the
present invention and shows another example of the schematic structure of the electronic
musical instrument, and FIG. 10 (a) is a front view, and FIG. 10 (b) is an E-- FIG. It is sectional
drawing seen from E '.
Explanation of sign
[0050]
DESCRIPTION OF SYMBOLS 1 CPU 2 flash memory 3 RAM 4 External storage medium mounting
part 5 External I / O interface part 6 Signal bus 7 Key scan circuit 8 Keyboard 9 Panel scan
circuit 10 Operation panel 11 Tone generation part 12 Waveform memory 13 Signal processing
part 14, 61 D / A conversion unit 15 power amplifier 16 speaker 17 vibration element 21
acoustic diaphragm 62 analog signal processing unit 71, 81 back load horn 92 diffuser 101
vibration propagation unit 102 lower front plate
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