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JPH10289284

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DESCRIPTION JPH10289284
[0001]
The present invention relates to the prediction of a speaker effective area used for rough
prediction of speaker installation angle, effective transmission area of sound from a speaker, etc.
in electroacoustic equipment system design such as hall or gymnasium. It relates to a ruler and
the usage of the ruler.
[0002]
2. Description of the Related Art In the design of an electroacoustic equipment system in a large
space such as a hall or a gymnasium, the mounting angle of the speaker is one of the important
factors determining the quality of the entire system. The calculation of the mounting angle is
often performed using acoustic simulation software such as EASE (manufactured by Lenkas
Heinz) or a modeler (manufactured by Bose). Although these softwares are very versatile and
convenient softwares, they are expensive, need to get used to data input, and take time and
effort.
[0003]
[Problems to be Solved by the Invention] If it is necessary to make full use of many functions of
the software, such as sound pressure distribution calculation and clarity calculation, as well as
the selection of the speaker model and the determination of the mounting angle, Even if it takes
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time to do it, if it is necessary to first know the rough installation angle and the number of
speakers in advance, it will be complicated by the multiple functions and slow in calculation
speed. It becomes a problem. For example, in the design of electrical equipment, customers are
often presented with drawings, and the type of loudspeakers, the number of members, the
mounting angle, etc. are often asked, and answers are often required on the spot. Such software
can not cope with such cases. In addition, when using acoustic simulation software, calculation
and correction are actually repeated by trial and error, and it is possible to shorten calculation
time by starting calculation after grasping a rough installation angle in advance. In addition, since
the area which effectively transmits the sound from the speaker changes as the mounting angle
of the speaker changes, it is necessary to confirm the effective transmission area of the sound
even if it is rough. .
[0004]
From the above, the present invention can easily predict a rough attachment angle of the speaker
and an area where the sound from the speaker can be effectively received from the drawing of
the speaker installation place and the type of the speaker by drawing. An object of the present
invention is to provide a prediction ruler such as an effective speaker effective area and a method
of using the ruler.
[0005]
According to a first aspect of the present invention, there is provided a prediction ruler such as a
speaker effective area in a vertical plane (hereinafter referred to as a vertical plane ruler), and a
transparent plate corresponding to a speaker position. Indicates the effective vertical spread
angle of the sound emitted from the point, the first reference straight line passing through the
first point, and the speaker disposed at the first point and directed in the direction of the first
reference straight line A pair of vertical spread angle straight lines and a rotation angle scale
indicating a rotation angle from the first reference straight line centering on the first point are
displayed.
(Claim 1).
[0006]
This vertical ruler is used, for example, on a vertical sectional view showing a place where a
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speaker is installed and its sound receiving area. If you set the first point to the speaker
installation position in the same figure and rotate the vertical ruler around that point, the inside
of the pair of vertical spread angle straight lines or their extension lines is the effective sound
receiving area The rotational position of the ruler, which is an appropriate effective sound
receiving area, can be determined on the sectional view, and the angle between the first
reference straight line and the horizontal line of the sectional view is read on the rotational angle
scale at the rotational position and Two points of a front intersection point (P1 ') and a rear
intersection point (P3') which are the intersection points of the sound receiving line indicating
the sound receiving area and the vertical spread angle line are described. The effective sound
receiving area in the front and rear direction in the cross section when the speaker having the
vertical spread angle is attached at the same downward swing angle as the read angle between
the two front and rear intersection points (P1 ', P3') Represents
[0007]
The second invention comprises the vertical surface ruler and another prediction ruler such as a
speaker effective area (hereinafter referred to as a horizontal surface ruler), and the horizontal
surface ruler is a second point corresponding to the speaker position on a transparent plate. And
a second reference straight line passing through the second point, and a pair indicating the
effective horizontal spread angle of the sound emitted from the speaker disposed at the second
point and directed in the direction of the second reference straight line Horizontal spread angle
straight line and the horizontal spread angle straight line inclined at each swing angle when the
speaker directed horizontally is given a swing angle going diagonally downward in the vertical
plane at appropriate angle steps A straight line group extending from the pair of the second
points indicating the projected spread angle and the value of the swing angle corresponding to
each is appended is displayed Claim 2).
[0008]
The vertical surface ruler describes, for example, a front intersection point (P1 '), a rear
intersection point (P3'), and a middle intersection point (P0 ') on the sectional view, as described
in the first invention.
And a horizontal ruler is used on the top view corresponding to the above-mentioned sectional
view showing the place in which a speaker is installed, and its sound reception field. That is, first,
a front point (P1), a rear point (P3), and a middle point (P1) corresponding to the front, rear, and
middle intersection points (P1 ', P3', P0 ') on the speaker directivity direction straight line
passing through the speaker installation position in the plan view. P0) is described, and a second
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straight line passing through the middle point (P0) and orthogonal to the speaker directivity
direction straight line is described. Then, the speaker installation position on the plan view is
matched with the second point of the horizontal ruler, and the second straight line is matched
with the second reference straight line, and the value of the swing angle corresponding to the
read angle from the group of straight lines A straight line is added, and a left point (P2) and a
right point (P4) which are two intersections of the selected pair of straight lines and the second
straight line are noted. The points (P1, P3, P2, P4) in the front, rear, left and right described in
the plan view are connected by a closed curve. The inside represents a rough effective sound
receiving area.
[0009]
The third invention is a method of using a prediction ruler such as the aforementioned speaker
effective area, that is, the usage method of the vertical surface ruler and the horizontal surface
ruler, and shows a speaker installation position, a sound receiving area, and a first straight line
representing a speaker pointing direction. Prepare a plan view and a cross-sectional view
showing a horizontal straight line passing through the speaker installation position and the
speaker installation position in a cross section along the first straight line in the plan view and a
sound receiving line representing the height of the sound receiving area. And the vertical spread
angle straight line or the extension line thereof and the sound receiving line which are moved by
rotating in a state in which the first point of the vertical surface ruler is made coincident with the
speaker installation position of the sectional view. The intersection point is observed, and the
effective sound reception section of the speaker pointing direction indicated between the two
intersection points is selected and determined to obtain two front intersection points (P1 ′), a
rear intersection point (P3 ′) and the sound reception line 1 With a reference line or its
extension The middle intersection point (P0 ') is described in a cross sectional view and the angle
between the first reference straight line and the horizontal straight line in the cross sectional
view is read from the rotation angle scale, and the front intersection point described in the cross
sectional view (P1) '), The back point (P3'), the front point (P1) corresponding to the middle point
(P0 '), the back point (P3), the middle point (P0) and the middle point (P0) And a second straight
line perpendicular to the first straight line, and matching the speaker installation position on the
plan view with the second point of the horizontal ruler, and matching the first straight line and
the second reference straight line And selecting a straight line attached with a value of a swing
angle corresponding to the read angle from the straight line group, and selecting a left point (P2)
which is an intersection point of the selected straight line and the second straight line. , The
process of marking the right point (P4), the front point (P1), the left point (P2), and the rear (P3),
the right point (P4), characterized in that it comprises a step of connecting by a closed curve.
[0010]
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The inside of the closed curve connecting the front and rear and left and right points (P1, P2, P3
and P4) drawn on the plan view by this method is an effective sound receiving area.
This method recognizes how the effective sound receiving area in the front and back direction
changes as the pointing direction of the speaker is changed in the vertical plane at a
predetermined mounting position, and selects the effective sound receiving area in the specific
front and back direction. At that time, it is possible to recognize the state of the spread of the
effective sound receiving area in the lateral direction (left and right as viewed from the speaker
side), and the effective sound receiving area at that time can be represented on the plan view as
the inside of the closed curve. .
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
be described with reference to FIGS. The prediction ruler such as the speaker effective area in
this embodiment comprises a vertical surface ruler 1, horizontal rulers 2, 3, 4 and so on. The
vertical surface ruler 1 and the horizontal surface rulers 2, 3 and 4 are each formed of a thin
flexible plastic plate of a rectangular transparent plastic, as shown in FIGS.
[0012]
The vertical surface ruler 1 is disposed at a first point 10 corresponding to the speaker position,
a first reference straight line 11 passing through the first point 10, and a first point, as shown in
FIG. Pair of vertical spread angle lines 12 and 12 showing an effective spread angle of 20 ° in
the vertical direction of the sound emitted from the speaker directed to one side along the first
reference straight line 11 (rightward in the figure) A pair of vertical spread lines 13 and 13
indicating an effective spread angle of 40 ° in the vertical direction of the sound, and a rotation
angle scale 14 indicating a rotation angle from the first reference line 11 about the first point 10;
, Is displayed. The vertical spread angle straight lines 12 and 13 are determined by the directivity
characteristics of the speaker, that is, the vertical spread characteristics of the emitted sound
correspond to 20 ° and 40 °. Therefore, when there is a possibility that a speaker with this
other characteristic is used, it is better to display the corresponding pair of vertical spread angle
straight lines, and when the display is too large to be seen, it is possible to separately use vertical
You may make a surface ruler and divide and display appropriately. The rotation angle scale 14
is scaled in a counterclockwise direction up to 90 °, and the first reference straight line 11 is 0
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° with a numerical value representing an angle at intervals of 10 ° on a scale line in 1 °
increments. The rotation angle when the ruler 1 is rotated clockwise about a first point 10 from a
certain position can be read.
[0013]
The horizontal rulers 2, 3 and 4 have substantially the same configuration, but the angles differ
depending on the difference in the directivity characteristics in the horizontal direction of the
speaker. The horizontal ruler 2 is disposed at a second point 15 corresponding to the speaker
position, a second reference straight line 16 passing through the second point 15, and a second
point 15, as shown in FIG. 1 (b). Pair of horizontal spread angle lines 17 and 17 indicating the
effective horizontal spread angle 120 ° of the sound emitted from the loudspeaker directed in
the direction of the second reference straight line 16 (upward in the figure), Indicating the
projected spread angles obtained by projecting the horizontal spread angle straight lines 17 and
17 inclined in the horizontal plane at each swing angle when the directed speaker is given a
swing angle directed obliquely downward in the vertical plane at appropriate angle steps A group
of straight lines 18, 18 extending from the second point forming a pair, with corresponding
swing angle values (in the sense of tilting the speaker downward to 20 ° to 70 ° in 10 °
increments, with a-sign And (appearing) are displayed.
[0014]
As shown in FIG. 2, the horizontal ruler 3 has the same second reference straight line 16 passing
through the second point 15 as compared to the horizontal ruler 2, and the horizontal effective
spread angle of the sound emitted from the speaker is The points are different by 90 °, and
therefore the horizontal spread angle lines 19, 19 and the straight line groups 20, 20 of the
projected spread angles at respective swing angles based thereon are also different. The
horizontal ruler 4 also has the same second reference straight line 16 passing through the
second point 15 as compared with the horizontal ruler 2 as described above, as shown in FIG. 3,
and the horizontal direction of the sound emitted from the speaker is effective. It differs in that
the angle of spread is 60.degree., And therefore the horizontal spread angle straight lines 21, 21
and the straight line groups 22, 22 of the projected spread angles at each swing angle based
thereon are different.
[0015]
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The prediction ruler such as the speaker effective area having such a configuration has, for
example, a vertical directivity of 40 ° and a horizontal directivity of 30% at the speaker
installation position 30 in a hole as shown in FIGS. 4 (a) and 4 (b). When predicting a speaker
effective area when a speaker of 60 degrees is used, it uses as follows. In this case, the vertical
surface ruler 1 and the horizontal surface ruler 4 are used. First, the necessary drawings are
FIGS. 4 (a) and 4 (b). That is, FIG. 4 (b) is a plan view showing the speaker installation position
30, the sound receiving area (in this case, the arrangement state of all the audience seats), and
the first straight line 31 representing the speaker pointing direction; A horizontal line 32 passing
through the speaker installation position 30 and the speaker installation position in a cross
section along the first straight line 31 and a sound receiving line representing the height of the
sound receiving area (in this case, the height position of the ear of the person seated in the
passenger seat 4 (a), which is a cross-sectional view showing a connecting line 33). In the figure,
28 is a space of a hall, and 29 is a passenger seat.
[0016]
By using this cross-sectional view and the vertical surface ruler 1 as shown in FIG. 5A, the
speaker installation position 30 of the cross-sectional view is rotated in a state in which the first
point 10 of the vertical surface ruler 1 matches. Observe the two intersections of the extension
line of the moving vertical divergence angle straight lines 13 and 13 and the sound receiving line
33, and select and determine the effective sound reception section of the speaker pointing
direction indicated between the two intersections. In the cross-sectional view, a front intersection
point P1 'which is one intersection point, a front intersection point P3' and a middle intersection
point P0 'which is the intersection point of the sound receiving wire 33 and the extension of the
first reference line 11 The angle made with the horizontal straight line 32 in the sectional view is
read from the rotation angle scale 14. This angle is a swing angle that indicates how many times
the speaker has been tilted downward with respect to the horizontal. In this case, the swing angle
read is 40 °.
[0017]
Next, as shown in FIGS. 5A and 5B, vertical lines are drawn from the front intersection point P1 ',
the rear intersection point P3', and the middle intersection point P0 'described in the sectional
view to the first straight line 31 in the plan view. And a second straight line 34 perpendicular to
the first straight line 31 passing through the middle point P0. Then, as shown in FIG. 6, the
speaker installation position 30 on this plan view matches the second point 15 of the horizontal
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ruler 4, and the first straight line 31 matches the second reference straight line 16 of the ruler.
The straight line group 22, 22 is selected from the straight lines 22 and 22 with a swing angle
value of 40 °, and the selected straight line is drawn on the plan view to draw its extended line
36, 36. A left point P2 and a right point P4, which are two intersection points of the extension
lines 36 and 36 and the second straight line 34, are described. Finally, when the points P1, P2,
P3 and P4 on the plan view are connected by a smooth closed curve 37 surrounding the middle
point P0, the inner area, that is, the hatched area is the effective sound receiving area. .
[0018]
From FIG. 6, to obtain a rough effective sound receiving area when a speaker with a vertical
directivity of 40 ° and a horizontal directivity of 60 ° is installed at a speaker angle of 40 °
obliquely downward at the speaker installation position 30 Can. Therefore, for example, in the
case of using such a main speaker, it is necessary to consider where and how many other
auxiliary speakers are required in almost the same way to make all the audience seats effective
reception areas. The number of required speakers etc. can be roughly estimated.
[0019]
In FIGS. 1 to 3, a plurality of circular holes 40 formed along the edge of the ruler are binding
holes for binding to a so-called system notebook in which the sound system instruction material
and the like are bound, and the material of the ruler is flexible. A cut 41 reaching the edge is
provided so as to be removable using the property, thereby providing the convenience of
portability and the loss prevention effect. Also, the small circular holes in the middle of each of
the straight lines 11, 12, 13, 17, 18, 19, 20, 21, 22 displayed on the ruler are for marking the
points when the straight lines are drawn in the drawing. This makes it easier to draw the
corresponding straight line and its extension.
[0020]
According to the first aspect of the present invention, the effective spread angle in the vertical
cross section along the directivity direction of the speaker, the swing angle (attachment angle) in
the same cross section, and the front and back corresponding to the change in the swing angle. It
is possible to consider changes in the effective sound receiving area of the direction, and it is
possible to draw the effective sound receiving area in the front-rear direction extremely easily in
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the drawing assuming the effective spread angle and the swing angle. According to the second
aspect of the invention, in addition to the above, the effective sound receiving area in the lateral
direction with respect to the pointing direction of the speaker can be entered on the plan view,
and rough effective sound receiving areas Produces an effect that can be displayed by a closed
curve. As a result, the type, number, and mounting angle of the speakers can be predicted in a
short time. The invention according to claim 3 can easily display the effective area of the speaker
as a closed curve in a short time in a short time in accordance with the type of speaker and the
mounting angle, so that the type of speaker, the number of members and the mounting angle are
roughly determined. It has the effect of being able to conduct examinations quickly. As such, the
inventions described in claims 1, 2 and 3 are effective in reducing the time required for
simulation, replacing the work at the initial stage of use of simulation software. In addition to the
mounting angle of the speaker, it can also be used to select a camera lens and predict the angle
of view.
[0021]
Brief description of the drawings
[0022]
1 shows a ruler of the embodiment of the present invention, (a) is a plan view of a vertical
surface ruler, (b) is a plan view of a horizontal surface ruler.
[0023]
2 is a plan view of another horizontal ruler showing the same embodiment.
[0024]
3 is a plan view of still another horizontal ruler showing the same embodiment.
[0025]
4 is a diagram showing a speaker installation place for explaining the usage method of the
embodiment, (a) is a cross-sectional view taken along the line AA of (b), (b) is a plan view.
[0026]
5 shows an example of use of the vertical surface ruler of the same use method, (a) shows the
cross section AA and the vertical surface ruler, and (b) is a plane in which points P1, P0 and P3
are drawn. FIG.
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[0027]
6 is a plan view showing an example of use of the horizontal surface ruler of the same use
method, and drawing the effective sound receiving area by entering the left and right points P2,
P4.
[0028]
Explanation of sign
[0029]
Reference Signs List 1 horizontal rule 2 vertical rule 3 vertical rule 4 vertical rule 10 first point
11 first reference line 12 spread straight line 13 spread straight line 14 rotation angle scale 15
second point 16 second reference straight line 17 horizontal spread angle straight line 18
straight line group 19 horizontal spread angle straight line 20 straight line group 21 horizontal
spread angle straight line 22 space of straight line group 28 hall 29 guest seat 30 speaker
installation position 31 first straight line 32 horizontal straight line 33 sound receiving line 34
second straight line P1 'front intersection point P2' Rear intersection point P0 'Middle
intersection point P1 Front point P2 Left point P0 Mid point P3 Rear point P4 Right point 37
Closed curve (effective sound reception area)
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