JPH07307991

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DESCRIPTION JPH07307991
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker system for controlling directivity by combining a plurality of loudspeakers.
[0002]
2. Description of the Related Art In recent years, it has been desired to miniaturize a speaker
system. For that purpose, it is necessary to miniaturize the speaker unit that constitutes the
system. However, when the speaker unit is miniaturized, the input resistance is lowered, and a
method of using the speaker unit having a plurality of similar characteristics to make the input
resistance high is taken. In the external appearance perspective view of the speaker system of the
conventional example shown in FIG. 6, there are those in which two speaker units 3a and 3b
having substantially the same performance are attached to the front of the cabinet 1 with screws
4 at the top and bottom.
[0003]
However, in the conventional speaker system as described above, when the speaker units are
vertically arranged to increase the number of speaker units, the horizontal directivity is small
because the speaker units are small. Although a relatively wide directivity characteristic can be
obtained, the directivity characteristic in the vertical plane is indicated by a broken line 6 which
is a composite characteristic of the directivity characteristics 5a and 5b of each speaker unit as
shown in FIG. 7 of the side view of the conventional example. It has become a problem, and it has
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the problem that a directional characteristic will become narrow.
[0004]
The present invention solves the above-mentioned conventional problems, in which at least one
directional characteristic axis direction of two speaker units having substantially the same
characteristics is made variable, and the two speakers are identical by the same signal source. An
object of the present invention is to provide a means capable of controlling the directivity
characteristic of an acoustic space by being driven in phase.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker system of the
present invention is characterized in that at least one directional characteristic axis direction of
two speaker units having substantially the same characteristics is made variable. Speakers are
driven in the same phase by the same signal source, and more specifically, two cabinets of
substantially the same shape each incorporating one speaker unit are rotated by a pivot shaft. It
is configured to be movable and held stationary at an arbitrary position.
[0006]
According to the present invention, in the above configuration, when the degree of synthesis of
the directional characteristics of each speaker unit is changed and the directional characteristic
axes of the respective speaker units are made parallel, the directivity in a plane including both
directional characteristic axes The characteristic is the narrowest, and by controlling both the
directional characteristic axis angles to widen or intersect the synthetic directional characteristic
to widen and change the directional direction.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described below with reference to FIGS.
In FIG. 1 showing an external perspective view of a speaker system according to an embodiment
of the present invention, an axis 2 is pivotally connected in the directions of arrows A and B
within an angle range and symmetrical about the axis 2 Speaker units 3a and 3b having
substantially the same size and performance, respectively, are fixed by screws 4 to the lower
cabinet 1a and the upper cabinet 1b, which have substantially the same shape and the same size,
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respectively.
The shaft 2 has friction with the respective cabinets 1a and 1b, so that the cabinet 1b can stand
still at any angle with respect to the cabinet 1a.
[0008]
It is comprised as mentioned above and the operation ¦ movement is next demonstrated using
FIGS. 2-5 of a side view.
The two speaker units 3a and 3b are electrically connected in series or in parallel, and are driven
to be in phase by the same signal source.
Solid lines 5-1 and 5-2 are directivity characteristics in the vertical plane of each speaker unit
including the cabinet, and 6a to 6d are synthesized of directivity characteristics 5-1 and 5-2 of
each speaker unit. It is a directional characteristic in the vertical plane as a speaker system. As
shown in FIG. 2, when the directivity characteristic axes of the two speaker units 3a and 3b are
parallel to each other, the degree of synthesis of the directivity characteristics of the respective
speaker units 3a and 3b is the directivity of the conventional example of FIG. Similar to the sex 6,
the combined vertical in-plane directivity characteristic 6a is the narrowest. Next, as shown in
FIG. 3, by rotating the cabinet 1b slightly to turn the directivity characteristic axis direction of the
upper speaker unit 3b upward, the combined vertical in-plane directivity characteristic 6b has its
center direction up. It is possible to make the directivity wide as compared with FIG.
[0009]
As shown in FIG. 4, by directing the direction of the upper speaker unit 3b further upward than
in FIG. 3, the combined vertical in-plane directivity characteristic is such that the center direction
is further upward and the directivity characteristic is wider. Becomes possible. In this case, the
central direction of the combined vertical in-plane directivity characteristic 6c is further upward.
Conversely, as shown in FIG. 5, when the direction of the upper speaker unit 3b is directed
downward so that the directivity characteristic axes of both units intersect, the direction of the
combined vertical in-plane directivity characteristic 6d is lowered. It is possible to widen the
directional characteristics as well as
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[0010]
As described above, according to the present embodiment, the vertical direction directivity
characteristic of the speaker system in the vertical direction can be controlled by making the
vertical direction of one speaker unit rotatable, and as a result, in the vertical direction It is
possible to increase the degree of freedom of the listening position. Along with this, a slight
change occurs in the in-horizontal-plane directivity characteristic in this case. Also, the directivity
characteristic becomes sharper as the frequency becomes higher, and affects the sound quality
characteristic at the listening position. For this reason, it is also possible to approach the desired
sound quality by operating the vertical direction of the speaker unit with respect to the listening
position.
[0011]
Although the speaker unit is vertically rotated by dividing the cabinet in this embodiment, the
same effect can be obtained by rotatably mounting the speaker unit on the same cabinet.
[0012]
Further, in the present embodiment, the directivity characteristic in the vertical plane is changed
by rotating the direction of the unit up and down, but a speaker system having the same
structure is rotated 90 degrees sideways to change the directivity characteristic in the horizontal
plane. It can also be done.
[0013]
Furthermore, the method of turning the shaft of the speaker unit or cabinet is not limited to that
of this embodiment, and may be adopted including the conventionally known method.
[0014]
As described above, according to the speaker system of the present invention, at least one
directivity characteristic axis direction of two speaker units having substantially the same
characteristics can be made variable, and the two speakers can be controlled by the same signal
source. It is characterized in that it is driven in the same phase, and more specifically, two
cabinets of substantially the same shape, each having one built-in speaker unit, can be pivoted on
a pivot shaft and stopped at an arbitrary position. And hold the configuration.
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[0015]
By varying the directivity characteristic axis of at least one unit according to this configuration,
the degree of synthesis of the directivity characteristics of each speaker unit is changed, and
when the directivity characteristic axes of the respective speaker units are made parallel, both
directivity characteristic axes The directivity characteristics in the plane containing the signal
become the narrowest, and it is possible to widen the combined directivity characteristics by
opening or crossing both directivity characteristic axis angles and to control to change the
directivity direction. While increasing the degree of freedom, it also becomes possible to
approach the sound quality of your choice.
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