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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of a conventional horn
speaker, FIG. 2 a, b and c are characteristic views thereof, FIG. 3 is a plan view of a platform, and
FIG. 4 is a calculated platform 5 shows the relationship between speakers and homes in the
vertical plane, FIG. 6 shows the optimum vertical directivity pattern of the platform obtained by
calculation, and FIG. 7 shows the optimum horizontal directivity pattern of the present invention.
FIG. 8a is an external view of a horn speaker according to one embodiment. b and FIGS. 9a and
9b respectively show top and cross-sectional views of two embodiments, FIG. 10a. FIG. 11a and b
are connection diagrams of the driver unit according to the present embodiment, FIG. 12 is a
characteristic diagram thereof, and FIGS. 13a and 13b show the prior art and the embodiment of
the present invention. Is a diagram showing an isoacoustic line of
[Detailed description of the invention] The present invention relates to a horn speaker for
loudspeakers used in a train brat home, and a bratt home for the purpose of improving its
pointing characteristic is a well known loudspeaker service. . a)? и 1 area is special. For example,
although the home is a couple of nights +,% ~, the loudness of the ? force is usually '+ yl' in each
of the hos individually, and the adjacent homes are broadcasted (crosstalk) It is hopeful that it is
not possible to have a high level of clarity at any listening point, and it is desirable that the sound
quality is good, especially in recent years, a demand has arisen not only for voice but also for
loud music The sound quality needs to be further improved because of the noise.-The speaker for
the conventional brat home has taken these items into consideration. However, various kinds of
on-home listening, changes in intelligibility in noise, and sound quality changes are heavy. FIG. 1
shows a conventional platform speaker, wherein 1 is a horn, 2 is a driver unit, and 3 is a sound
axis. This speaker is a system that takes out the sound from the front and back of the diaphragm
by one driver unit, and the front and back loud sound is in opposite phase. Figure 2 shows the
case where white noise is added to this horn speaker The characteristic is shown, and the same ia
indicates the directional pattern when using the horizontal and vertical Lin filters, and the
directional pattern when using the horizontal and vertical 1/1 octal filter, as shown in FIG. As can
be seen from the figure, each directivity pattern has a large pattern change due to the frequency.
Therefore, in the case of loud-speaking on the plant home, it is clear that the sound quality
change, clarity, and deterioration are particularly large except for the listening point near the
front ? ? and 9 The loud-speaking sound from each horn is reversed near the side Due to the
phase, although some cancellations are made in the low frequency range, the sound is extracted
before and after the 41 driver units, so the degree of attenuation is small due to the difference in
sound pressure level, and the degree of loudness to adjacent homes is large. In particular, the
reduction is likely to lead to the spread (interference) to adjacent homes due to the influence of
reverberation and the like. If the service area of the speakers in the front direction is reduced to
prevent this, the sound pressure level at the home end becomes smaller, and if the number of
mounted speakers is increased for this measure, a large cost is required. The same applies to
vertical plane directivity characteristics. '' In general, the speaker is mounted at a high position of
about 3 to 6; (Ir 3 \\--'is attached, so the service area of the speaker is not in the front direction
(sound axis 3) but on the lower side Therefore, the change in sound quality, the deterioration of
BJ'J intelligibility will be large., 1 '"one piece of invention is the above-mentioned missing article,
Home', service of t'F # a-in rear At various anchor points, it is intended to provide all horn
speakers with less change in sound quality '-'-' change, distinct change in clarity, and less
interference with loud sound to adjacent homes. Description will be made with the examples.
Fig. 3 is a plan view of the 6 brano tomo, 4 has a speaker, 5 (51, 52, 53) has a home, size A has a
single speaker, service area B, has a home width, B2 has Indicates the home interval. In this case,
a speaker is attached at the center of the home width B1 to indicate that the speaker is loud. The
distance between the speaker 4 and the adjacent home is-+ B2, and the distance between BLLB
21 'and any angle is eleven. The ratio of the distance within the home at the next two-junction
home is the same regardless of the direction. In the service area, the directivity pattern with less
change in sound quality, less intelligibility deterioration, and less interference (speaking) to an
adjacent home should be from low to ^ mt, as shown by the broken line in FIG. At this time, the
degree of interference (S / N) to the adjacent home is BB1 ? + B2??B2??B2 ?S / N ? =
20??ogB, = 20 ? ? 9-town ??55, according to the square law of distance. Thus, to
determine the directional characteristics of the speaker for the plant home, as described above,
service и 1 area A 9 one side home width i and to the adjacent home B, '. When considering a
general numerical value that needs to take into consideration the distance-tens B2, etc., the
interference degree (S / N at this time) is obtained when B1 # 10 (FM) and B2 ? ?-10 (m). ) Is S
/ N = 20 j! og stop 10 (dB) and I'm sorry. Conversely, the sound pressure level in the home
service area is higher than the mixed sound pressure level to the adjacent hole by one minute or
more. Also, for example, if the interference sound pressure level to the adjacent home is about 10 (dB) from the noise level of the home, S / h can be about 0 to 10 (dB) in the service area, As is
well known, it is possible to obtain an acuity of about 90 tes or more so that S / N is sufficient 0.
Next, an example of the optimum horizontal directivity pattern by the service area A (Fig. 3 break
i) is the same condition. In this case, the distance can be calculated from the following equation
using the square law of distance-1 distance, and it becomes as shown in FIG. 4 for 7 'B 1 20 R q q
-z (dB) (-; considered in each direction) o (4 + t ha = 2 o, pIi A = rs, t 1 t A = loa 4) The reason why
the service area A is 10 to 20 m is based on the speaker's W sound pressure level. That is, in
general, in the case of a horn / speaker, the average output sound pressure is about K'- 100-110
(dBs PL / m / w), 10 m at 10 and ao-so (dBSPL / w), 2 om ,. = 74-84 (dBSPL / w), and the noise
level at the platform is considered to be up to about 80- 'и') dB-A. If all l и n stories are considered,
the service area A is considered to be up to 20 m ? ? = about.
In addition, in the same way, it is desirable to reduce the number of mounted skaters at minimum
10 FP + or more is desirable for 10 days 10 ff +, and the sound pressure around the side is about
-6 dB, and the sound pressure near the side is about -6 dB. In the case of A; 15 m, the half angle
is about ▒ 4 g, near the side, --- ? 1 sound pressure is about-tod ? и ?-In the case of A-,
M92'Om, the half angle is About ▒ 30. Eight sound pressure near the side is considered to be
about -1 sdB, and this value, if the sound pressure near the half rumor angle and the side near
the side is large, there is more interference to the next '/ f # i contact home In the opposite case,
the sound pressure level near the home ? ? end decreases. In general, the former problem is
considered to be large, so it is desirable to make the value smaller than the above value. For
example, the sound pressure near the side is preferably about -6 dB. Next, the directivity pattern
of the vertical plane will be described. FIG. 5 shows the speaker 4 and the home 6 in the vertical
plane when the speaker 4 is mounted at the general h = 6 m position on the home 6, and C
shows the listening surface of the general formula. In the same mouth, the service area A and the
speaker 4f on the listening surface C! The connecting angles Q are as follows. Q, if A = 1om. L-, 2
o 0 A ?, 15 ff 141 ?) Q 15 ? ? =, 13 ░ A ? ? = 20 m, 02 ░ L; 10 ? ? than the above
angle, the range smaller than the above is the other adjacent scribe service area, so radiation The
sound pressure level on the listening surface C is made the same on the basis of each 00 in FIG. 5
by making the range larger than this Q value, for example, about + 10 ░. If it calculates |
requires with the square law of distance similarly to FIG. 4, it will become like FIG. In the figure,
in the case of A # 10m as shown in ? 1, the sound lfh & pressure near the lower side is about sdB, and as shown in the mouth, when A = 1s'm, the sound pressure near the lower side is about
It becomes -13dB. As shown in (a), if A ? 20 m, the area near the lower side will be about ttm-1
sdH) If the above value is small, it is a problem, but if it is somewhat large (up to ssd), within the
service area Because the sound pressure level of is improved, it is good. However, in order to
make the sound pressure level uniform, it is desirable that the sound pressure level be relatively
short as shown in FIG. 6 in the service area. Above, 0 for the optimal horizontal and vertical
directivity patterns is as shown in the following table 0 (below margin) 1 ░ horizontal pattern
vertical pattern area half value angle Side with radiation angle ?) sound pressure (dB) Sound
pressure of (dBl ,.
About ▒ 800 about -6 to about 20 "about (-3) (-12) to -9164001 about -1013 ░ about (-7) to (1e) to -132 ░ to about 300 -131Q- '(about From the results of -9) to (-19) to -16 or more,
compared to the conventional speakers used for the platform, the half-value angle of the
horizontal directivity pattern is sufficiently large from the low band to the high band, and the
vertical directivity It is desirable for the pattern to have a radiation angle and a shoulder at the
sound axis. Further, it is desirable that the sound pressure of the output near the side and the
output sound pressure level near the lower side be appropriate values as in the upper garment.
Fig. 7-Fig. 8 shows a concrete example of the actual J-1 # entering case where 1 & represents a
longitudinal facing, 1b represents a lateral facing, d represents a horn main body axis , 6 is the
horn open) ? 7 indicates the throat portion of the horn opening 6, and 8 indicates the average
sound path direction of the vertical cross section. 11 A brief description of this speaker follows.
The horn opening 6 has a square cross-sectional structure, and the cross section of the horn
throat 7 has a vertical V, a horizontal H dead gold ? ?> 1 and a flat surface of the horn from the
throat to the opening Alternatively, the structure has an exponential inclination, and the facing of
the horn to # V1 is symmetrical with respect to the sound axis, and the facing 20i1b of the
horizontal H is asymmetrical, and the average sound path of each horn cross section The
directions are different. This horn is capable of changing the directivity pattern in the horizontal
and vertical directions by the inclination of each facing 1a, 1b, and the average sound path
direction 8 of the vertical section substantially coincides with the sound axis 3. Therefore, when
considered as a speaker for a brat home, it is optimal because the face-to-face 1a makes it
possible to make the horizontal directivity characteristic a pattern suitable for the platform and
the face-to-face 1b a vertical directivity pattern having a certain radiation angle to the home. It
can be considered as a speaker. Fig. 10 shows an example of speaker characteristics measured by
inputting white noise, a is horizontal, b is hanging! 12 shows a direct directivity pattern. As
apparent from the figure, the characteristic of the horizontal directivity pattern of the speaker
and the directivity pattern of the middle and high regions are angular patterns. That is, when
using the O-speaker, which easily increases the half-value angle, for the platform, it is
conceivable to combine the backs of the two speakers into two directions. In this case, the sound
pressure near the side (near 90, 270) It is necessary to consider the connection, as it varies
greatly with the interference of the two speakers. The optimal method is described next. Since it
is necessary to reduce interference (speaking) to the adjacent home for home use, it is desirable
to reverse the phases of the driver units of the two speakers in series or in parallel. In this
connection example, d is in series and b is in parallel.
Although the transformer is not used in the example of the same figure, the same is true even
when the ? ') I difference ? lance is used. FIG. 12 is a characteristic diagram of Example 13
when white noise is input, aI When using a '1 Lin filter, b and a indicate horizontal and vertical
directivity patterns when using a 1/1 octal filter. In this figure, this embodiment has a half value
angle of about ▒ 40, a sound pressure of about -13 dB near the side, a radiation angle of about
15, and a sound pressure of about -s dB near the lower side (service area). We think that service
area is suitable for approximately 16m from. In addition, it can be understood that, by using the
above-mentioned connection system of the low band r / 'i which is relatively broad in the case of, it is possible to cancel near the side and to reduce the interference to the adjacent home. And, in
the wide range near the front, it is the same from the low to the high. It is clear tfg & from taking
a directivity pattern. It can be seen that the degree of deterioration and the change in sound
quality are small. Further, it can be seen that since the driver units are individually used for the
front and rear horns, the variation in the characteristics is small. In the prototype example of the
present invention, a dip occurs in the ? 2 ? surface characteristic when the distance between
the opening planes X is ?, and the composite 1 gain at the point of ?. ??????????
?????? If you try to increase the friend as a countermeasure against the horn / C (cut-off
frequency), since X is large, cancellation near the side does not occur from the higher frequency
side. It is necessary to make it the heritage X so that the frequency below which it wants is
canceled. For example, in the case of the prototype, the horizontal aperture diameter is about 35
saws, and the distance between the aperture planes is about twice that T. I am jealous. FIG. 13
shows horizontal and vertical isoacoustic lines on the brat home of the conventional product and
the embodiment of the present invention, (A == 1sm based on directivity pattern when using Lin
filter A) is a conventional example and b is an embodiment of the present invention. As can be
seen from the figure, when compared with the conventional product, the embodiment of the
present invention provides a wide service area over a wide range on the home, and has less
interference with adjacent homes. Also, in the vertical plane, it can be seen that the efficiency is
good because a large amount of energy is concentrated in the service area. In the above
embodiment, although the speaker is specifically described as a speaker for the plant home, if it
is similarly used in the other 16 places, it is the same as the main purpose of the present
invention. According to the present invention, in consideration of the shape of the loud sound
service area of the platform, the speaker's horizontal half-value cleaning, sound pressure near the
side, vertical surface radiation angle, sound pressure near the lower side (service area) etc. In this
way, with this speaker in two directions, the phase of each driver unit is connected in series or in
parallel in reverse phase, intelligibility suffers in a wide service area, and changes in sound
quality are small, And it is possible to obtain plant home sliders with less interference to adjacent
homes 04, simple detonation of the figure. Figure 1 shows the appearance of a conventional horn
speaker, Figure 2 a, b and c show its characteristics, 3 is a plan view of the plant home, FIG. 4 is a
diagram showing the optimal horizontal directivity pattern of the platform obtained by
calculation, FIG. 4 is a relationship between the speaker and home in the vertical plane, and 6 is
obtained by calculation Fig. 7 shows an optimum vertical 16-directional pattern of the platform,
Fig. 7 is an external view of a horn speaker according to an embodiment of the present invention,
Fig. 8a.
b and FIGS. 9a and 9b are top and cross-sectional views of two embodiments in the same figure,
respectively, the 10th section 1a. 11 b is the characteristic diagram, FIG. 11 a, b is a connection
diagram of the driver unit of this embodiment, FIG. 12 is its characteristic diagram, 13 FIG. It is a
figure which shows a sound pressure line. Name of the agent Attorney Nakao and others 1
person I Figure 1 3 Figure 3 33 884 h Mr. the agent is also a patent attorney 1 Toshi NakaoFigure 2 (?), to par. 7 и и и и и и и и и---/-----'33 884: Lev patent attorney Toshio Nakao Name of agent
Figure 2 (b) circle. ? ? \ \ / spirit% и /, H ', ? "q и, ? и \ / Xt (dB) и и и и и knee. ???░????
? ??????? X \ / / '\-2-Agent's name 33 884 / Bure deputy Toshio Nakao Figure 2 CC) /to 1-\. / \ Value 1. ? 'и и и и и и и и (To "-", /, ", kel:' y. ? "" "IK string) fork \ 11,? ,) 15. и и и и и и и и и и и и ░
и ░ и и и и и и и и и и \ \ \ \-, Nee / ? agent's name ? ? ? ? ? ?3 Figure 5 5152 253 // 728 28 4
'/ t "A (+)-" 33 as 47 (q Toshio Nakao Figure 4). ???????? ? ? \ Per / view / / /
person 1 no-H% \ \ ~ = name of the agent "" 84i clef attorney Toshio Nakao Figure 5 Figure 4 \ U
near 3) "/ 46 ? To ? + 4 r 618 ! ,-Often ?ra N 3 '\ 2 ft 1 1 A "" 33 884 /' F ? ? + ++ 1 # i bite
figure 6 Fig. 7 ? 2 s ? \ \. ?????????? To /// ' Seo / ? ?, ? ? meeting? Name of
the agent 33884, B9 Toshio Nakao 1) Figure 7 Figure 7. Nei и 'l /' of the agent Mr. 1 Q Q Q QAToshihisa Nakao 8 Figure 6 ? 7? Cite spring Fig. 6 (?--7 Cb) / 7 name of the agent 33884 ? ?
7 10 Figure ((L + 6 to 11. ???? ?????? ????????? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? \ ', /' T \, l \ +;-,,, 7 / \-, "" / \\ 1. ,-%-/, / \ и и
"T,-'/ p 2 ░ ░ [phase]-name of the person i attorney-11 tail 7 woman man-Figure 1a tb + / / \ \
Pressure и и и 4 8K и и ? book. ?? ??? ????????????????? \ 'и и и и / / 2,
2-7 и fK 250 ? i ? 33 884 / Boo to the attorney in charge-Mr. Hug-o-Mr. Figure 11 ? at D и и и и и
/ / \ 3 (8) 3 (8), 3 CI j) 3 (B) t1 agent's name-33 ssa, 4 patent attorneys Nakao Sakai + @ M11 L
Fig. 12 (?-one-to-).
7 /, \ (dl $) ? \\ 884 884 8 33 ? 33 884, "" two: ": ? 12 (b) /-to 1-. 1 ░ / -'- \ building 7 ',
pressure 1,' \ to и person / ? ? person / ? ? ? j6xi% 2 ░ <d3 + 8 K?1 ииии (K и j, 1N ? ии), 1 ( ,,
71 ░ X ') \,'%, ''-8: 'one ░-2', ...! ???? \-------Name of the agent 33884 Bone patent Toshio
Nakao Fig. 12 (Cn / ?; ?-?-и и и и и ?. ?, 16) It is , ?: 24/24/1 ?
j 2 l 1 + 1 / / / ?1?
?1? ? ? ? ? ? ? ? ? ? Nakao Name of the Toshio agent l Figure 13 (cL + family budget
/ '(amount / l ft) mA (+) "3, F" ? / / P capture soil Toshihisa Nakao, 6 other than the above
inventor and agent (1) inventor's address Yokota Ward, Yokohama Prefecture Kobayashi-ku
Tsunashima bunch 4 c # 1 Matsushita communication -In-house name Takahashi Jingei
Takahage (2) Agent address Osaka Prefecture Kadoma city Ogata Kamon Shining address 1006
Matsushita Electric Industrial Co., Ltd. ": E \ Name (6152) Patent Attorney Shigeno, 1, 1, l-9 9
floor 4 4R mu 'di) one near \ splash? ?
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