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JPS54125628

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DESCRIPTION JPS54125628
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 4 are graphs showing the transmission
characteristics of the conventional line source speaker together with the frequency
characteristics of direct sound and the frequency characteristics of inter-concave, and FIG. FIG. 6
is a front view showing one embodiment of the present invention, FIG. 6 is a sectional view taken
along line Vl-Vl in FIG. 5, FIG. 7 is a front view showing another embodiment, and FIG. FIG. 9 is a
graph showing the frequency characteristics of the isometric radiation solid angle Q of the line
source speaker according to the present invention in comparison with the conventional one. 2 · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · tweeter.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a line source
speaker used for loudspeakers. In general, when loudening in a hall, etc., the entire direct seating
area is covered with equal-level direct sound, and transmission characteristics (both direct sound
and indirect sound can be covered by two Kagehira (1) n-(1, r) ". The sound quality and the
brightness of the sound that the leveled ablow sound is flat in both the near sound field 1 and the
diffuse sound field. And desirable in terms of hearing. However, in line-source-speakers
commonly used as loudspeakers, the single-wave number characteristic of the output sound at
one thousand level is temporarily flat, while the sound output level 7 <1-<-one-wave WII When
the time falls in the high altitude area, there is a missing 7 points. -7 For this reason, if the line,
source, and speaker are used to enhance the sound in a hole or the like, the high frequency band
of the transmission characteristic is degraded in the 1 diffuse sound field. In other words, in the
near sound field, the direct sound has a large characteristic of being scattered, and in the diffuse
sound field, the characteristic of one wave number of the indirect sound is large and the fjRf11
number of the direct sound! The nature is closely related to the output sound level mentioned
above, and the indirect sound is related to the sound output level mentioned above. For this
reason, in the 1-near-field, as shown by * 11 fi, the transmission characteristic is flat (3), while in
the diffuse sound field, the transmission characteristic is lowered in the high region as shown in
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FIG. Therefore, in order to recast the transmission characteristics of such a diffuse sound field, it
is conceivable to make the harmonics characteristics of the sound output level 7 rat by using, for
example, an electrical equalizing means. As shown in Fig. 8, 1 output sound of apparently recast
as shown in Fig. 8 ■ high band of 1 wave number characteristic of level rises 1 For this reason,
in the near sound field, 4th! i! As shown in IJ, the high frequency band of the transmission
characteristic rises. In addition, even in the diffusion sound field, the high frequency band of tdirect sound is lifted by the transmission FP transport, and the audibility 1 ear noise 9 sound is
obtained. In this busy near sound field and the diffuse sound field, since there are members in
the transmission characteristics, as 1 loudspeakers for themselves, the cabinet wave wk inertia of
1 output sound level and 1 wave number of sound output level by itself It is desirable that the
difference with the characteristics be as small as possible. (8) In other words, W range where the
sound can service the direct of the speaker is the formula / 0101 <Q-PWL-8PL (where pwt + tt
sound output level, spL, Fi axis axis / point output fl'F level is there. Equivalent to the equivalent
radiation solid * Q defined in), and the intensity of the sound of the total output and the on-axis
point l to weaken the directivity of the test speaker. However, in the nomber of the furnacecentered directional loudspeaker (reference I of the reference axis I) K solid angle Q, which is bad
for the test speaker, it is equal to the reference direction, and another 81!
11) The trial speaker is an 11IIIII speaker, and the equivalent directivity of the directivity is
indicated by an equivalent KIIF. If the value of the equal-dominant radiation solid angle Q is 7 rat
and there is no decrease particularly in the high region, it is desirable-in the case of the
conventional line source speaker, as described above 1 Because the sound output level is lowered
in the high frequency range, the value of the equivalent radiation (4) body direction Ω is high in
the high frequency band and the power becomes sharper, and the direct silence in this frequency
range The service area is getting smaller. This invention is in charge of the article-to have been
made, re-cast the directivity of the high region, to provide a line source speaker tS that can make
a wide service area of blind sound to hit the high region to shoot An object of the invention is
that the characteristic feature is that the W number of tweeters arranged in a line on the baffle
plate are * t directed in different directions. Below is one practical example of this invention v?
Description will be made with reference to the WJ plane. # I 5 shows the front of the line source
speaker according to this invention 1 Front cabinet l front baffle l Ii Just in case, Daikichi-bass
Sukika δ of the diameter for reproducing the low range (hereinafter referred to as a woofer) The
small one high-pitched sound Sbee power 4 (hereinafter referred to as tweeter) with a small
diameter for reproducing a plurality (one in the drawing) and one high region A 12-way line
source speaker K11ltlt is provided with one UII *> as shown in the figure (6). That is, the woofer
8 is disposed in a line in the longitudinal direction (at equal intervals in each other) in the left
half 21 of the baffle If8, and the tweeter 4 is parallel to the woofer 8 in the right half 2b of the
baffle plate 3 The same I'II'lII is in a row. Then, while the left half molecule ia of the baffle plate 2
is flat, the right half 2b has a wave 1! As shown in FIG. ! Kll has been. That is, in the plane
perpendicular to the upper surface of the cabinet cabinet 1) and the baffle plate 2, the directions
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of the respective woofers SOg are parallel to one another in the plane perpendicular to one
another. . A convex portion 5 is formed in a substantially central portion of the right half s1 of
the baffle plate 3 in the lengthwise direction, and a tweeter number is made close to each other
at the position of the convex portion 6 for 4 years. Show the case. As shown in the 8111ffK, the
cross section of the one convex 11S5 is in a multi-scalloped shape, and the upper surface of the
one cavity 1 and the baffle plate tlK are similar to the above case. The axial direction of each
tweeter 4 is different in a flat pipe.
Thus, according to the above tE, according to the tE example, the reproduction sound of 1 each
woofer 8 is low, the reproduction sound of each tweeter 4 is also high and the tweeter 4 is also
emitted. The reproduced sound in the high range is emitted in the direction in which the tweeter
4 is arranged. Therefore, the output sound field level single wave number characteristic falls in
the high region-this causes the difference between the sound output level OIN wave number
characteristic to become small, and as shown in Fig. 19, equivalent radiation stop angle gOIIN
wave sand time Compared with the conventional one, the rise is 9 in the high frequency region,
especially in the arrangement direction of the tweeter 4, and the service region of the high
frequency region is wider and directivity is improved. And, as shown in Fig. 7 and Fig. 8
particularly, if each tweeter 4 is close to a point, it will be 11! The tweeter 4 of flight P is closer
to the apparent point sound source, and the directivity can be further falsified. In addition,
according to the above-mentioned affair example, in order to make each tweeter 40-year-old
direction different, the case where the cross-section sculpting of the baffle plate 3 in which the
tweeter 4 is disposed is corrugated is shown as the polygon Wt. However, the installation of the
tweeter 4 may change the angular add-on, of course. As described above, according to this
invention, the baffle plate has a single line KIil! Since each axis line of the set wI several tweeters
are bited in different directions so as to have different directions, the equivalent @ side solid
angle Qf) @ wave number characteristic does not decrease in the high region-directivity of one
high region However, the service area of the direct sound can be wide, and the entire seat such
as a hall can be covered with a level 0 wM touch sound. Moreover, even if there are transmission
characteristics, no difference occurs between the near sound field and the diffuse sound field.
Therefore, in the case of a hall abbreviation (8) when the sound is amplified, the sound quality
and the light WM of the sound become excellent K on the listening path. And if tweeters are
installed close to each other, it is possible to measure the directivity even more. Tubes of the eWj
plane: a graph showing the transmission characteristics of the conventional line source speaker
together with the spring wave number characteristics of the W junction and the wave number
characteristics of the indirect sound, FIG. 1 to FIG. 4 6 is a front view showing one practical
example of this invention, $ 61! ! ! I is a M-11 wire arrow multiple sectional view of 餉 5, sugar 7
is a front view showing a practical example of Naka, Fig. 8 is a 1-1 @ arrow cross sectional view
of Fig. 7 Fig. 9 is this It is the graph which showed the cold wave number characteristic of
equivalent radiation solid angle Ω of the line source speaker concerning invention in comparison
with the conventional one. 2 · · · Baffle plate, 4 · · · · tweeter. Applicants Japanese Instruments * a
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Co., Ltd. Attorney Attorneys Shiga Masatake 7-1 (9) (,) [l l1, '; 2 Figure 11 Buddha indecent
Buddha sending instant color Q 闇 5ort \ \ 8, /, ゝ 廚 − − 廚 廚 A 枡 A 第 A Fig 3 Fig 4 Fig 4 "□
shoulder 5 1 ro-1 l!
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−-name · shoulder 5 Figure'-', Figure 12-? J/4−m−b4ゝ1ゝ\−1、
−:”57ml(A’;8@? −■? 1’b? #? a \ i- □ 1 + 1 applicant -1,1, 'i people, l Lj ·
5 行 12 28 28 Z υ% 71-Masashi Shiga Figure 9 5 5 ter Ω 一 子 (Hz 1; ド ト ド 入会 111 (埋 1 址
L Shiga Masatake 1z552'i3'A
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