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Description 1, title of the invention
Variable directivity type speaker device
8. Detailed description of the invention The present invention provides a variable directivity type
speaker device capable of changing the directivity of the sound by electrical switching operation
when broadcasting using a plurality of small speaker units. The purpose is In a conventional
broadcast speaker apparatus using a plurality of 7J \ -type speaker units, a speaker unit is
disposed in the vertical direction to deteriorate directivity in a horizontal plane, or a spherical
shape to make it nondirectional. Alternatively, there are cylindrical baffles in which the central
axes of the loudspeakers are arranged radially, and so on, but these loudspeaker devices are all
limited directional or non-directional loudspeaker devices. 'The present invention arranges a
plurality of / h-type speaker units two-dimensionally on the same plane so that their central axes
are parallel, and selectively drives or drives any of the speaker units. It is intended to change the
directivity of sound simply and instantaneously by driving an arbitrary speaker unit of the
speaker units to be in reverse phase. Embodiments of the present invention will be described
with reference to the drawings. Fig. 1 shows the horizontal direction (X-axis direction) on the
same plane so that the central axes of nine speaker units A1B, C, DlE, F% Q, H, I are parallel to the
cruciform baffle 1 And the case where they are arranged in the vertical direction (y-axis
direction). FIG. 2 is a diagram showing an audio signal supply device for these nine Spy EndPage:
1 units, wherein 2 is a changeover switch, 3 is a phase reverse switch, 4 is an attenuator, and 5 is
an audio signal source. The 9J switch 2 drives any one of these nine speaker units. Similarly, the
phase reverse switch 3 reverses the positive / negative connection of the audio signal source 5 to
an arbitrary speaker unit to drive the speaker unit in reverse phase. The attenuator 4 corrects the
volume difference accompanying these switching. In the switching operation described in 2.8.4,
the speaker unit group in a specific arrangement selected among the nine speaker units is driven
in conjunction, and a predetermined directivity is changed by combining the outputs of these
speaker units. Be 8, 4 and 5 show patterns of the sound pressure release 1 when the apparatus
of FIG. 1 is driven, and FIG. 8 shows speaker units A 1 B and C in the vertical direction. In this
case, D and E are driven in phase. As shown in the figure, sharp directivity is changed in the
vertical plane. FIG. 4 shows horizontal speaker devices F, Q, C% I (, I can be converted.
FIG. 5 shows the case where the speaker units G and (-) in the symmetrical position are driven in
reverse phase. In this case, of the voices of both speakers, the voice on the center line Z axis is
canceled out, and the directivity becomes a pattern as shown. As described above, the speaker
device of the present invention can change its directivity by selectively driving any of the
plurality of speaker units in the same phase or in the opposite phase. It is possible to further
diversify the directivity by changing the arrangement of the plurality of speaker units. Moreover,
since the switching of the directional characteristics is instantaneously performed by the
electrical operation, it has an excellent effect in enabling the use of the speaker device in a street,
a theater, a meeting place or the like.
4. Brief description of the drawings Fig. 1 and Fig. 2 show one embodiment of the device of the
present invention Fig. 2: Connection diagram of the device of Fig. 1 Fig. 8: directivity when the
device of Fig. 1 is driven Fig. 4 shows an example of the pattern of Fig. 4: the same as the above
Fig. 5: the same 1 above ... 1 ... baffle, 2 ... changeover switch, 3 ... phase reverse switch, 4 ...
attenuator, 5 ... voice Signal source A ~ ■ · · · · Speaker unit 沁 1 End EndPage:2
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