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JPH10341493

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH10341493
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
broad directivity characteristic loudspeaker used for HiFi audio and speakers for acoustic
measurement, and in particular, a plurality of loudspeakers are arranged on the periphery of a
polyhedron or sphere to obtain good quality from various directions. The present invention
relates to a wide directional characteristic loud-speaking apparatus that can hear the sound of
[0002]
2. Description of the Related Art Heretofore, as this type of thing, there is one as disclosed in
Japanese Utility Model Application Publication No. 59-31105.
[0003]
In this case, unimorph oscillators and a diaphragm are disposed on each surface of a regular
dodecahedron which is a polyhedron so that sounds can be heard from various directions around
the polyhedron.
[0004]
However, it has been known in the prior art that high-frequency attenuation is caused in the
speaker other than the frontal characteristics on the axis, and unimorph oscillators and
vibrations are applied to each surface of the polyhedron as in the above-mentioned prior art. In
the arrangement of the plates, the unimorph oscillators and the like are inevitably disposed at
mutually inclined positions, not on the same plane, and in view of the axes of the unimorph
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oscillators and the like. It was difficult to hear good quality sound from low frequency to high
frequency at all positions in the whole circumference of the device because high frequency
attenuation was caused except at the front of the line.
[0005]
In Hi-Fi speakers, etc., frequency flatness is required to keep the sound pressure constant even if
the frequency changes, and in the case of speakers dedicated to acoustic measurement,
frequency flatness and non-directivity are required. However, no measures have been taken
against high-frequency attenuation due to such an arrangement of the speakers.
[0006]
Then, this invention makes it a subject to provide the wide directivity characteristic loudspeaking apparatus which can obtain an equal sound pressure from a low frequency to a high
frequency in the perimeter of an apparatus.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the invention
as set forth in claim 1, a plurality of loudspeakers are disposed on the peripheral surface of a
polyhedron or sphere loudspeaker system, and the adjacent loudspeakers are provided. The axis
line of the speaker has a predetermined angle, and a correction filter is connected to each of the
speakers, and the correction value of the correction filter is set so that flatness of sound pressure
can be obtained at each position around the main body of the loudspeaker system. It is
characterized in that it is a wide directional characteristic loud speaker.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below.
[0009]
1 to 8 show an embodiment of the present invention.
[0010]
The configuration will be described first. Reference numeral 1 in FIG. 2 denotes a wide
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directional characteristic loud speaker. The wide directional loud speaker 1 has a regular
dodecahedron loud speaker main body 2 as a "polyhedron". A total of twelve coil speakers 3 as
"speakers" are disposed on the surface portion.
In each of the speakers 3, as shown in FIG. 3, the axis P passes through the center O of the
loudspeaker apparatus body 2 and the angle θ between the axes P of the adjacent coil speakers
3 is 63 ° in this embodiment. It has become.
[0011]
As shown in FIG. 1, four of the coil speakers 3 are connected in series, and these are connected in
parallel in three columns.
A correction filter 4 composed of resistors R1 and R2 and capacitors C1 and C2 is connected
between the speakers 3 and an amplifier (not shown).
[0012]
The correction filter 4 is set such that the values (correction values) of the resistances R1 and R2
and the condensers C1 and C2 can obtain flatness in sound pressure at each position around the
main body 2 of the loudspeaker.
That is, as shown in FIG. 3, the measurement position S1 spaced about 50 cm from the apex
between the adjacent coil speakers 3 is the position having the maximum inclination
characteristic, and when the correction filter 4 is not provided, As shown in FIG. 5, the
characteristic curve P1 between the frequency and the sound pressure attenuates the sound
pressure as the frequency becomes higher.
Therefore, as shown in FIG. 6, by using the correction filter 4 in which the sound pressure
becomes higher as the frequency becomes higher, as shown in FIG. 4, the characteristic curve P2
in the slope characteristic can maintain flatness. It is set.
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3
[0013]
The attenuation factor here is determined by the angle θ formed by the axis lines P of the
adjacent coil speakers 3 and the characteristics of the coil speaker 3, so the correction value of
the correction filter 4 is appropriately set according to the attenuation factor. .
[0014]
In this way, even at oblique positions of the coil speaker 3, a flat characteristic curve P2 can be
obtained, and good sound quality can be obtained at all positions around the device.
[0015]
Further, as shown in FIG. 7, at the measurement position (S 2) on the axis line P of the coil
speaker 3, the coil speaker 3 is set so as to maintain flatness without the correction filter 4 being
interposed. However, when the correction filter 4 is interposed, there is a concern that the sound
pressure can not maintain flatness at a high frequency.
However, even on the axis P, flatness can be maintained for the following reasons.
[0016]
That is, as shown in FIG. 7, the waveform T1 of the sound from the center speaker 3 at a high
frequency (here, around 2.4 kHz) at the measurement position S2 on the axis P of the coil
speaker 3 is shown in FIG. It becomes as shown to a), and the waveform T2 of the sound from the
speaker 3 of the both sides becomes as shown to (b) of FIG.
As shown in FIG. 7, since the centers of the coil speakers 3 at the center and the both sides are
separated by about 75 mm from the measuring device S2, as shown in FIG. A wavelength shift
occurs, and here, the phase shift by 180 ° causes interference with each other.
As a result, the high-frequency rise due to the correction filter 4 is suppressed, and substantially
evenness is maintained in the frontal characteristics.
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However, this interference frequency differs depending on the individual frequency
characteristics of the coil speaker 3.
[0017]
By providing the correction filter 4 in this way, even if the frequency changes, the flatness of the
sound pressure level can be maintained in the slope characteristic, so that the sound can be
brought closer to the real sound all around the wide directional characteristic loud speaker 1 .
[0018]
Therefore, by using the broad directivity characteristic loudspeaker 1 as a HiFi audio and
acoustic measurement, and other loudspeakers, it is possible to widely provide market users such
as industrial speakers with excellent acoustic reproduction and accurate acoustic stages. it can.
[0019]
That is, according to the broad directivity characteristic loud-sounding device 1 of the present
invention, the same sound fidelity can be obtained anywhere in the room reproduction sound
field, and as a result, a good stereo image enlargement area is formed. You get the sound fidelity
you can, and it relieves the listener from having to sit at only one "listening point".
This is the result of the uniform 360 ° horizontal and vertical dispersion of the broad directivity
loudspeaker system 1 of the present invention, which gives the complete effective listening range
of the listening area with minimal early reflection of the floor and ceiling. .
[0020]
Further, the broad directivity characteristic loud-sounding device 1 of the present invention
develops the correct total echo field in the room both spatially and spectrally, so that the back
side characteristic is deteriorated as in the conventional directional front emission type speaker.
It is possible to obtain an effect of making the generation of incidental sound by the room itself a
minimum listening feeling without accompanied by the accompanying bad sound deterioration.
[0021]
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Furthermore, it is only necessary to use the correction filter 4 with an extremely simple
configuration consisting of the resistors R1 and R2 and the capacitors C1 and C2 at one place.
Further, since the correction filter 4 is provided in the main unit 2 of the loudspeaker system, it
does not require a special filter or preamplifier outside, and the handling can be simplified.
[0022]
In addition, although the coil speaker 3 was used as a speaker in the said embodiment, not only
this but a capacitor speaker etc. can also be used.
Further, the "correction filter" of the present invention is not limited to that of the above
embodiment, and the number of capacitors and resistors is different depending on the type of
speaker or the like, and a coil or the like can also be used.
In any case, it is sufficient that the flatness of the frequency characteristic can be maintained.
Furthermore, in this embodiment, the loudspeaker system is formed in a regular dodecahedron,
but the present invention is not limited to this. The number of faces may be more or less, and a
sphere may be used. However, since the angle formed by the axis lines of the adjacent speakers
can be made smaller in the case of a polyhedron or sphere having 12 or more faces, the
inclination characteristic can be made smaller accordingly, so that the correction amount by the
filter can be small and flatness can be maintained.
[0023]
As described above, according to the invention of claim 1, by providing the correction filter, the
flatness of the sound pressure level can be maintained in the slope characteristic even if the
frequency changes. , It can be brought close to the real sound in the whole circumference of the
wide directivity characteristic loud speaker. Therefore, by using a wide directional characteristic
loudspeaker as a HiFi audio and acoustic measurement, and other loudspeakers, it is possible to
widely provide market users such as industrial speakers with excellent acoustic reproduction and
accurate acoustic stage. .
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[0024]
In addition, the wide directivity characteristic loud speaker of the present invention develops the
correct total echo field in the room both spatially and spectrally, and is accompanied by the
deterioration of the rear characteristic as in the conventional directional front emission speaker.
It exerts a practically useful effect that the effect of minimizing the sense of listening even with
the generation of incidental sound by the room itself can be obtained without being accompanied
by malicious sound deterioration.
[0025]
Brief description of the drawings
[0026]
1 is a circuit diagram of a wide directivity characteristic loudspeaker according to an
embodiment of the present invention.
[0027]
2 is a front view of the wide directional characteristic loud speaker according to the same
embodiment.
[0028]
3 is a cross-sectional view taken along the line AA of FIG. 2 according to the same embodiment.
[0029]
4 is a graph showing the relationship between the sound pressure and the frequency at which
the filter of the wide directivity characteristic loudspeaker according to the embodiment is
provided.
[0030]
5 is a graph corresponding to FIG. 4 when the filter according to the same embodiment is not
provided.
[0031]
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6 is a graph showing the relationship between the sound pressure and the frequency of the filter
according to the same embodiment.
[0032]
7 is an explanatory view of the case where the measurement position according to the same
embodiment is on the axis of the coil speaker.
[0033]
8 is a diagram showing the waveform at the measurement position of FIG. 7 according to the
same embodiment.
[0034]
Explanation of sign
[0035]
1 Wide directivity characteristic loud speaker 2 Loudspeaker main body 3 Coil speaker (speaker)
4 Correction filter
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