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JP2005191925

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DESCRIPTION JP2005191925
PROBLEM TO BE SOLVED: To accommodate a sound source of the same scale in a scale model
and measure the sound emitted from the sound source to grasp the sound state of a planned
building at the stage before construction of a real object, and to make corrections. The purpose is
to study so as to realize better sound conditions. According to the present invention, a 1/50 to
1/10 scale model of a construction severe to acoustic properties such as a hall or a music room
to be constructed, a sound source position inside the model, and a frequency corresponding to
the scale An object of the present invention is achieved by an acoustic model experiment system
characterized in that the acoustic model experiment speaker according to claim 1 is combined.
[Selected figure] Figure 1
Loudspeaker for acoustic model experiment and experimental system using the same
[0001]
The present invention relates to a speaker for an acoustic model experiment used in the
examination for the purpose of improving room acoustics such as a hall or a music room in more
detail, and an experiment system using the same.
[0002]
As a method of examining the room acoustics in a conventional hall or music room (hereinafter
referred to as a hall etc.) in detail, after the construction of the hall etc. is completed, the sound
source is placed in an appropriate place (sound generation place) inside The characteristics are
considered.
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As a sound source, for example, 12 speakers are arranged on the core surface of a regular
dodecahedron with a side length of 10 cm to 14 cm, and it is used as a nondirectional speaker
system for the purpose of measuring indoor acoustic characteristics. .
[0003]
The acoustic characteristics refer to various physical quantities calculated from reverberation
time, sound pressure level distribution, echo time pattern, and impulse response. These are
measured by various methods, and based on the measurement results, it is confirmed whether or
not the completed holes, etc. meet the desired design goals, and if they do not, the causes are to
be grasped and the response is taken. Examine. ISO-3382-3, 4.2.1 Sound Source
[0004]
In the above-described conventional experiment of a hole or the like, it takes a lot of labor, cost,
and time to change (modify) the shape of wall or the like which adversely affects the
characteristics because it is performed after completion of the hole or the like. Therefore, before
constructing a real hall, etc., an acoustic model experiment has been conducted to predict
acoustic characteristics such as a planned hall using a model, but as a sound source device used
for the experiment, accuracy There has been almost nothing efficient and excellent in stability.
[0005]
According to the present invention, in order to examine indoor acoustical properties such as a
hole in more detail, an acoustic model experiment is conducted to best modify the model such as
a hole, and the hole is designed and constructed based on the data. The conventional problem
corrected after completion of the hole etc. was solved.
[0006]
In the above, for example, when using a 1/50 to 1/10 scale model, in order to simulate an
acoustic phenomenon such as an actual hole, a short wavelength sound (that is, a high frequency
sound) corresponding to the scale is used. Need to use.
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In the case of 1/10 of the scale, the phenomenon occurring at 4 kHz in the real sound field is a
phenomenon of 40 kHz in the model, that is, a phenomenon of an ultrasonic region which can
not be heard by the human ear.
[0007]
Therefore, if a speaker that can reproduce in the band of 500 Hz to 80 kHz, which is required in
1/10 model experiments, and that is substantially nondirectional at 10 kHz or less, is used in the
similar relationship to the real thing The problem was solved by acquiring the knowledge which
can raise the same accuracy as a real experiment such as.
[0008]
That is, according to the present invention, assuming a regular dodecahedron on the surface of a
sphere fixed to the upper part of a shoal, a small speaker for high-pitched sound reproduction is
fixed centering on the center of each face and a bass on the lower side of the shoal Three smallsized speakers for reproduction are fixed at an angle of 120 degrees while being inclined upward
and fixed, and the small-sized speaker for high-pitched sound reproduction is a small dome
speaker, and the bass for the high-pitched sound reproduction. The small speaker for
reproduction is a small cone speaker.
[0009]
Still another invention is a 1/50 to 1/10 scale model of a construction stricter to acoustics such
as a hall or a music room to be constructed, and a sound having a frequency corresponding to
the above scale at the sound source position inside it. An acoustic model experiment system
characterized in that it is combined with the acoustic model experiment speaker according to
claim 1 which can be reproduced.
[0010]
As described above, this speaker is configured by arranging the small dome speaker units (12
pieces) serving as the sound source of the high-pitched sound reproducing unit and the small
cone speakers (three pieces) serving as the sound source of the bass reproducing unit Therefore,
while being able to cover a high-pitched part and a low-pitched part, reproduction becomes
possible to 500 Hz-80 kHz as a scale effect, and the examination range by experiment can be
expanded.
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[0011]
Further, assuming a regular dodecahedron on the peripheral surface of the sphere and fixing the
center of each surface to the center of the speaker, the installation position becomes extremely
accurate, and the measurement accuracy can be easily improved.
[0012]
About the said system, the place where the comparative experiment was carried out about 10 or
more halls in various places, including Fukushima City Music Hall, was able to obtain the result
as expected in all.
[0013]
An advantage of the acoustic model experiment of the present invention is that it can simulate
the wave phenomenon of sound.
For example, studies are being made to incorporate wave phenomena into computer modeling,
but model experiments are actually better.
In order to simulate acoustic phenomena such as actual holes (utilization of similarity rules), it is
necessary to use sounds with short wavelengths, ie, high frequencies, corresponding to the scale.
For example, at a scale of 1/10, the phenomenon occurring at 4 kHz in the real sound field is a
phenomenon at 40 kHz in the model, that is, a phenomenon in the ultrasound region which can
not be heard by our ears.
Therefore, it was confirmed that the band of 500 Hz to 80 kHz, which is required in 1/10 model
experiments, can be reproduced, and 10 kHz or less is almost omnidirectional. You can get the
result.
[0014]
According to the present invention, assuming a regular dodecahedron on the surface of a sphere
fixed to the upper part of a shoal, a small speaker for high-pitched sound reproduction reduced
to the same size as a model is fixed around the center of each surface. Since the small
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loudspeakers for low-pitched sound reproduction were fixed at an angle of 120 ° to the lower
part of the above-mentioned chopsticks while maintaining an angle of 120 degrees, the acoustic
characteristics for a model such as a hole were accurately measured. Can be produced.
[0015]
According to the system of the present invention, it is possible to measure the acoustic
characteristics by using the sound source of the same reduction ratio as the reduction of the hole
etc. Therefore, the improvement point of the hole etc is easily found and There is an effect that I
have made it possible to correct it.
[0016]
This invention assumes a regular dodecahedron on the surface of a sphere (for example, wooden)
fixed to the upper part of a shoal, and a small dome speaker for high-pitched sound reproduction
reduced to the same size as a model centering on the center of each surface. While being fixed,
three small cone speakers for bass reproduction, which are reduced to the same size as above,
are installed obliquely upward at an angle of 120 degrees to the base of the supporting rod to
provide a sound source for a model.
[0017]
Next, based on the design of the hole, etc., make a reduced model (the reduction ratio of the
speaker is the same) to 1/10 to 1/50 thereof, accommodate the sound source in it, and use the
hole at the specified frequency. Measure the acoustic characteristics, extract improvements and
defects and correct them.
If the design of a hole or the like is corrected based on the correction of the model, the completed
hole or the like has good acoustic characteristics and does not need to be corrected afterward.
[0018]
An embodiment of the sound source according to the present invention will be described with
reference to FIGS. 1 and 2. Assuming that a wood ball 2 (diameter 50 mm) is fixed to the upper
end of the support 1 and a regular dodecahedron circumscribing the surface of the wood ball 2 is
assumed The small dome speakers 3 are fixed at the center position.
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The direction of the small dome speakers 3 and 3 (diameter 20 mm) in this case is directed in the
direction perpendicular to the assumed regular dodecahedron.
[0019]
The base 4 is fixed to the lower end of the supporting rod 1, the support plates 5a, 5b and 5c are
fixed on the base 4 at intervals of 120 degrees, and small cone speakers 6a for bass reproduction
to the support plates 5a, 5b and 5c, The sound source 10 of the present invention was
configured by fixing 6b and 6c to the upward inclination respectively.
[0020]
Since the sound source 10 is reduced at the same scale as the model 7, the sound in the band of
500 Hz to 80 kHz can be reproduced, and it is confirmed that the sound source 10 is
substantially omnidirectional in the band of 10 kHz or less. The acoustic characteristics can be
measured with high accuracy by using in the acoustic model experiment as a scale model
speaker corresponding to the dodecahedron speaker used in the above.
[0021]
Further, assuming a regular dodecahedron on the outer surface circumscribing the tree ball and
fixing a small dome speaker for high-pitched sound reproduction to each surface, each speaker is
fixed uniformly at the correct position.
Therefore, there is an advantage that the accuracy when transmitting and receiving is improved.
[0022]
In addition, small cone speakers 6a, 6b and 6c for low-pitched sound reproduction are stable
since they are arranged at equal intervals for the lower end of the supporting rod 1, and are
stable while high-pitched sound reproduction and low-pitched sound reproduction are neatly
installed. The mutual positional relationship is accurately maintained.
[0023]
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Another embodiment of the present invention will be described based on FIG.
First, design a hole to be constructed, and then make a 1/10 scale model 7 of the hole.
On the other hand, a sound source 10 of the same scale is made, and this is set to a suitable place
in the model.
In the figure, 8 and 9 are microphones and other measurement containers.
[0024]
Next, the acoustic characteristics (eg, impulse response measurement, echo check, etc.) of each
speaker are measured, and the model is corrected based on this.
In this way, based on the scale model, it is possible to construct a hole with correct acoustic
characteristics by modifying the hole design drawing.
[0025]
FIG. 1 is a block diagram of an embodiment of a system of the invention.
Similarly the front view of a sound source. Likewise the rear view. (A) same top view, (b) same
explanatory drawing of a set in a model. (A) Frequency characteristics (VHO) of the dodecahedral
speaker for model experiments of the present invention, (b) frequency characteristics (H9O) of
the dodecahedral speaker for model experiments as well. (A) Frequency characteristics in the
same vertical direction 125 Hz to 500 Hz, (b) Frequency characteristics in the same 1000 Hz to
4000 Hz. (A) Frequency characteristics in the horizontal direction 125 Hz to 500 Hz, and (b)
frequency characteristics in the same 1000 Hz to 4000 Hz. (A) A directivity characteristic
diagram of 1 kHz to 4 kHz of a conventional dodecahedron (speaker installation), and (b) a
directivity characteristic diagram of 125 Hz to 500 Hz as well.
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Explanation of sign
[0026]
1 support 2 tree ball 3 small dome speakers 4 units 5a, 5b, 5c support plate 6a, 6b, 6c small
cone speaker 7 model 10 sound source
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