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JP2014122990

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DESCRIPTION JP2014122990
Abstract: The present invention provides a speaker device capable of monitoring musical
instrument performance without transmitting sound to persons other than the player without
wearing headphones. A flat speaker (13) is disposed with main surfaces outputting sound waves
facing each other, and a sound insulation member (23) is disposed on a main surface (rear
surface) opposite to the opposite main surface. Therefore, the monitor sound is output only to
the area 150 sandwiched by the flat speakers 13. The performer who is in the area 150 can
listen to the monitor sound, while almost no sound is output except in the area 150, so he does
not convey a loud performance sound to persons other than the performer. [Selected figure]
Figure 3
Performance sound monitor system
[0001]
The present invention relates to a performance sound monitor system provided with a speaker
for monitoring the performance sound of an instrument.
[0002]
In the past, there has been proposed a device capable of monitoring a performance sound while
performing muffling at the time of blowing a wind instrument such as a trumpet (see, for
example, Patent Document 1).
[0003]
11-05-2019
1
In general, a silencer as shown in Patent Document 1 is provided with a microphone for pickup.
A musical tone signal related to a performance sound collected by the pickup microphone is
amplified by an amplifier and output to a monitor speaker or headphones.
The performer can monitor the performance sound by listening to the sound output from the
speaker for monitoring and the headphones.
[0004]
JP 2007-101720 A
[0005]
However, with the monitor speaker, a certain amount of sound is transmitted to persons other
than the performer, and there is a problem in terms of sound insulation.
[0006]
In addition, because headphones have contact with the ears and head, wearing for a long time is
painful.
In addition, since headphones transmit sound directly from their ears and head, they can be
heard differently from the actual performance sounds (sounds transmitted through space and
heard).
[0007]
Therefore, it is an object of the present invention to provide a playing sound monitor system
which does not transmit a loud playing sound to persons other than the player without wearing
headphones.
[0008]
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2
The performance sound monitor system according to the present invention receives a
performance sound acquisition unit that acquires a performance sound of a musical instrument
played by a player, and a musical tone signal of the performance sound acquired by the
performance sound acquisition unit. A signal processing unit that amplifies and outputs a musical
tone signal, and a plurality of flat speakers disposed opposite to each other and to which the
musical tone signal is input from the signal processing unit are provided.
Each flat speaker is characterized in that a sound insulating material is provided on the surface
opposite to the surface facing the other flat speaker.
[0009]
The planar speaker outputs a planar sound wave having strong directivity in the normal direction
of the main surface, and the sound pressure level drops sharply as it is separated from the
normal direction.
And since the performance sound monitor system of the present invention arranges a plurality of
flat speakers facing each other, and provides a sound insulating material on the opposite side
(back side) to the facing surface, it is pinched by a plurality of flat speakers. The monitor sound is
output only to the other areas. Therefore, no loud musical sound is transmitted to persons other
than the performer.
[0010]
Moreover, it is preferable that a flat speaker outputs the sound of the frequency band
corresponding to a stringed musical instrument. For example, since the lowest frequency band of
the guitar is about 80 Hz, all sounds can be monitored if the lower limit of the frequency that can
be output by the flat speaker is about 80 Hz, and a loud sound can be given to persons other
than the performer. I can not tell you.
[0011]
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3
The flat speaker structurally does not output sound waves in the low frequency band, and the
sound waves in the low frequency band do not wrap around other than in the normal direction.
For example, when the area of the main surface of the flat speaker is 1 m <2> (equivalent to A0
size) or less, almost no sound below 80 Hz is output (it becomes less than −10 dB with respect
to the peak level). Therefore, if the area of the main surface of the flat speaker is set to 1 m <2>
or less, all the sounds can be monitored, and no loud sound is transmitted to persons other than
the performer.
[0012]
In addition, except for low-pitched stringed instruments (such as tuba and contrabass), since the
main frequency band of the performance sound is at least about 200 Hz, monitor the
performance sound sufficiently even if the area of the flat speaker is about A4 size Can. In this
case, the possibility of sound waves in the low frequency band being reduced further decreases.
Also, the smaller the flat speaker, the easier it is to carry.
[0013]
The playing sound acquisition unit may be an electronic stringed instrument or a pickup of a
stringed instrument without sonar resonance (so-called silent guitar etc.), but attached to a
silencer for an existing acoustic instrument (so-called pickup mute) It may be
[0014]
According to the present invention, it is possible to monitor a performance sound without
wearing a headphone and without transmitting a loud performance sound to persons other than
the player.
[0015]
It is the schematic of a performance sound monitor system.
It is a block diagram showing composition of a performance sound monitor system.
It is sectional drawing which showed schematic structure of the flat speaker. It is the figure
11-05-2019
4
which showed the direction dependency of the sound pressure level in the conventional cone
type speaker. It is the figure which showed the direction dependency of the sound pressure level
of a performance sound monitor system. It is the figure which showed the frequency distribution
of the frequency characteristic of a flat speaker, and the output sound of a stringed musical
instrument. It is a figure showing a modification of a plane speaker.
[0016]
FIG. 1 is a schematic view of a performance sound monitor system according to the present
invention. The performance sound monitor system includes a musical instrument (a trumpet 100
in this example) played by a player, a silencer 11 attached to the trumpet 100, a signal
processing unit 1 connected to the silencer 11, and a signal processing unit 1 And a plurality of
(two in this example) planar speakers 13 connected to The silencer 11 is inserted into the bell of
the trumpet 100 and has a function of reducing the volume of the trumpet 100 played. Further,
the silencer 11 is attached with a pickup (a performance sound acquisition unit of the present
invention), and outputs a tone signal corresponding to the performance sound of the trumpet
100 to the signal processing unit 1. In this example, although the silencer 11 and the signal
processing unit 1 are connected wirelessly, it is of course possible to be connected in a wired
manner.
[0017]
As shown in FIG. 2, the signal processing unit 1 includes a signal processing unit 101 and a
control unit 102. In the present embodiment, the D / A converter, the A / D converter, and the
like are omitted.
[0018]
The signal processing unit 101 incorporates a DSP and an amplifier, performs signal processing
(for example, adjustment of frequency characteristics, addition of an echo, and the like) to a
musical tone signal output from the silencer 11 and amplifies it. The content of the signal
processing of the signal processing unit 101, the amplification amount, and the like are set by
the control unit 102.
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5
[0019]
The amplified musical tone signal is output to the flat speaker 13 and is output from the flat
speaker 13 as a sound. Thereby, the monitor sound according to the performer's performance is
output from the flat speaker 13.
[0020]
As shown in FIG. 1, the flat speakers 13 are flat speakers attached to a stand, and are installed
facing each other. FIG. 3 is a cross-sectional view showing a schematic configuration of the flat
speaker 13.
[0021]
The flat speaker 13 is composed of a vibration unit 131 and a sound insulation member 23. The
vibrating unit 131 is an electrostatic type speaker, and has a structure in which a sheet-like
vibrating film is sandwiched between two fixed electrode plates. The vibrating unit 131 applies a
voltage to the vibrating membrane and the fixed electrode plate and changes the voltage applied
to the fixed electrode plate to change the electrostatic force. The vibrating film is vibrated by the
change of the electrostatic force to output a sound.
[0022]
In such a vibration unit 131, since the entire vibration film vibrates, the sound wave to be output
becomes a planar sound wave. Therefore, the sound wave output from the vibration unit 131 has
strong directivity in the normal direction of the main surface (the surface of the vibration film),
and the sound pressure level drops sharply as it is separated from the normal direction. In
particular, since the vibration unit 131 can not structurally take a large amplitude, almost no
sound wave in the low frequency band is output. For example, the lower limit of the outputtable
frequency of the flat speaker 13 in the present embodiment is about 80 Hz to 200 Hz (described
later with reference to FIG. 6). Therefore, the sound wave output from the vibration unit 131
hardly wraps around except in the normal direction.
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6
[0023]
The vibration unit 131 outputs sounds in opposite phase to each of the main surfaces. However,
in the flat speaker according to the present embodiment, the sound insulating material 23 is
provided on one of the main surfaces. Therefore, the sound wave is not output to the surface side
provided with the sound insulation member 23.
[0024]
Such a flat speaker 13 is disposed so that the main surfaces that output sound waves face each
other, and the sound insulating material 23 is disposed on the main surface (rear surface)
opposite to the opposite main surface. Therefore, the monitor sound is output only to the area
150 sandwiched by the flat speakers 13. The player plays at the position of this area 150 and
listens to the monitor sound.
[0025]
FIG. 4 is a diagram showing the direction dependency of the sound pressure level in the
conventional cone-type speaker, and FIG. 5 is a diagram showing the direction dependency of the
sound pressure level of the musical performance monitor system of this embodiment. .
[0026]
In the example of FIG. 4 (A), the direct front of the conventional cone-shaped speaker 130 is 0 °,
and the position apart from the front of the cone-shaped speaker 130 by a predetermined
distance (for example, 0.25 m) is set as the reference measurement position.
And FIG. 4 (B) has shown the result of having measured the sound pressure level in the
diagonally forward (45 degrees) and just beside (90 degrees), when the sound pressure level
measured in the said reference measurement position is made into 0 dB.
[0027]
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7
As shown in FIG. 4B, with the cone type speaker 130, sounds of 250 Hz, 1 kHz, and 2 kHz are
detected at -20 dB or more even at the position just beside (90 °), and are not significantly
attenuated. Recognize. In particular, sound waves in a low frequency band of about 250 Hz reach
with little attenuation.
[0028]
On the other hand, in FIG. 5A, when the center position of the region 150 is the reference
measurement position, and the sound pressure level at the reference measurement position is 0
dB, the predetermined distance (for example, 0.25 m) Sound pressure levels are measured in
front of the position (0 °), diagonally forward (45 °), and just beside (90 °).
[0029]
As shown in FIG. 5B, in the performance sound monitor system according to the present
embodiment, from the flat speaker 13 at any of the front (0 °), diagonal front (45 °), and just
beside (90 °) positions. It can be seen that the output sound is hardly reached (less than -20 dB).
In particular, as shown in FIG. 5B, even sound waves in a low frequency band of about 250 Hz or
125 Hz are attenuated to less than −20 dB. Of course, sound waves of about 1 kHz and 2 kHz
are also attenuated to less than -30 dB.
[0030]
Therefore, in the performance sound monitor system according to the present embodiment, the
player in the area 150 can listen to the monitor sound at a certain sound pressure level, while
almost no sound is output except the area 150. , It does not convey a loud playing sound to
persons other than the performer. That is, even if the performer monitors the performance sound
at a certain sound pressure level without wearing the headphones, it does not transmit a loud
performance sound to persons other than the performer.
[0031]
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8
In addition, the flat speaker 13 in the performance sound monitoring system of the present
embodiment is configured to output a sound in a frequency band corresponding to a stringed
instrument. That is, the main surface of the flat speaker 13 has an area corresponding to the
frequency of the stringed instrument. FIG. 6 is a diagram showing the frequency characteristics
of the flat speaker and the frequency distribution of the output sound of the stringed instrument.
FIG. 6A shows the frequency characteristics of a flat loudspeaker having an area of 1 m <2>
(equivalent to A0 size) of the main surface of the diaphragm, and FIG. 6B shows that the area of
the main surface of the diaphragm is A4. It is a frequency characteristic of the flat speaker which
is equivalent to size. FIG. 6C is a diagram showing the frequency distribution of the output sound
of the stringed instrument.
[0032]
As shown in FIG. 6A, in the case of a flat speaker in which the area of the main surface of the
diaphragm is 1 m <2> (corresponding to A0 size), the sound pressure level drops sharply below
100 Hz. Specifically, the frequency indicating -10 dB (80 dB) with respect to the peak level 90 dB
is about 80 Hz. That is, sound waves less than 80 Hz are hardly output. Then, as shown in FIG.
6C, the output sound of the stringed instrument is about 80 Hz even if the guitar emits the
lowest frequency. Therefore, the player can monitor the sound in the main playing range of the
playing sound, except for the low-pitched stringed instrument (such as tuba and contrabass). In
addition, if the area of the main surface of the flat speaker is 1 m <2> or less, the possibility that
sound waves in a low frequency band (sound waves less than 80 Hz) wrap around is low, and no
loud sound is transmitted to persons other than performers. .
[0033]
On the other hand, as shown in FIG. 6B, in the case of a flat speaker in which the area of the main
surface of the diaphragm is equivalent to A4 size, the frequency indicating -10 dB with respect to
the peak level is about 250 Hz. As shown in FIG. 6 (C), most of the stringed instruments have the
lowest frequency of 150 Hz to 250 Hz or more, and the main frequency band with large power is
about 200 to 400 Hz even for a guitar. That is, even if the area of the main surface of the
vibrating membrane is a flat speaker equivalent to A4 size, the player can sufficiently monitor the
playing sound of the above-mentioned orchestral instrument.
[0034]
11-05-2019
9
If the area of the main surface of the vibrating membrane is reduced, the possibility that the
sound wave in the low frequency band (in this case, a sound wave less than 250 Hz) will fall is
reduced and it becomes easy to carry. Therefore, the stringed instrument can be played
comfortably anytime and anywhere without disturbing other people.
[0035]
In the present embodiment, an example (so-called pickup mute) in which a pickup is attached to
the silencer of the trumpet 100 is shown, but a performance obtained by picking up an electronic
stringed instrument or a stringed instrument without sonar resonance (so-called silent guitar etc.)
A tone signal relating to a sound may be input to the signal processing unit 1.
[0036]
In addition, the structure and installation aspect of a flat speaker are not restricted to the
example shown to FIG. 1 and FIG.
For example, as shown to FIG. 7 (A), it is also possible to use the planar speaker 13A in which the
shape of the main surface is circular. Moreover, as shown to FIG. 7 (B), the aspect which connects
several planar speaker 13A in arch shape, and suspends with a stand is also possible.
[0037]
Furthermore, as shown to FIG. 7C, the aspect hung from the back of a chair is also possible. In
this case, the player can sit in a chair and monitor the playing sound. Moreover, as shown to FIG
7 (D), the aspect suspended from a ceiling is also possible.
[0038]
DESCRIPTION OF SYMBOLS 1 ... Signal processing unit 11 ... Silencer 13 ... Flat speaker 23 ...
Sound insulation material 100 ... Trumpet 101 ... Signal processing part 102 ... Control part 131
... Vibration unit 150 ... Area | region
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