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JPS5558791

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DESCRIPTION JPS5558791
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional speaker
device, FIG. 2 is a sound pressure frequency characteristic diagram of two domes in the same
speaker device, and FIGS. FIG. 5 is a front view of a speaker apparatus according to an
embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line x-x
in FIG. ???????????????????????????????? Haimitsudo, 7 ......
tweeter, 8 ...... listening point, 9 ...... Subi man box, 10 ...... front plate, 11 ...... partition Walls 12,...,
Rooms 13, 13, 13 '...
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a flat speaker
device with sound pressure frequency characteristics even in an actual sound field with floor
reflections as well as anechoic chamber characteristics. The most common speaker devices of the
prior art are designed so that only the sound pressure frequency characteristics in the anechoic
chamber are flat. The real sound field characteristics are taken into consideration. A conventional
speaker device designed to have a flat sound pressure even when there is floor surface reflection
will be described. In FIG. 1, 1 is a floor surface, and a speaker device 2 is disposed on the floor
surface 1. This speaker device 2 is a woofer 3. ??????? It is based on the Hymiddo 6 and
the tweeter 7. The mount 4 is mounted at 0.9 m from the floor surface 1 and has a band of 150
Hz to 600 Hz. Direct listening d to the listening point 8 and the floor, assuming that the listening
sacrifice 8 is usually the position of the ear when the listener listens to the speaker reproduction,
ie 0.9 m on the floor, and the distance 2 m from the speaker The path difference of the surface
reflection noise becomes 0.691 m, and dip at the sound pressure occurs at 249 Hz at the air
temperature of 20 ░ C. As shown in FIG. 2B, the second rhomboid 5 having a custom-designed
sound pressure frequency and receiving only the frequency range of characteristics as shown in
FIG. 2B is provided at a height of 0.46 m from the floor. In the case of this second rhombide 6, it
is at 473 Hz that the tip due to the reflected wave interference is 473 Hz, but at this frequency
the first rhombide 4 As shown in FIG. 3C, dips are not generated as the reproduced sound is
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dominant. As described above, this speaker device has flat sound pressure frequency
characteristics at a specific listening point even when there is floor reflection as well as an
anechoic chamber. However, this speaker device has a drawback that the sound pressure
characteristic at the listening point is not flat when the distance from the speaker at the listening
point changes. For example, assuming that the listening point position is 3 m from the speaker 2,
the direct wave of the sound emitted from the first rhombide 4 and the floor surface reflected
wave have a path difference of 0.499 m, as shown by D in FIG. The present invention, which
produces a dip in sound pressure, eliminates the disadvantages of the conventional speaker
apparatus as described above. An embodiment of the present invention will be described below
with reference to FIGS. In FIG. 6 and FIG. 6, 9 is a speaker box, and the front plate 1o of this
speaker box is a woofer 3.
A second rhombode 6, Hymiddo "T-", tweeter 7 is mounted. Reference numeral 11 denotes a
partition wall formed in the four-speaker box 9. The elongated wall 12 is formed vertically in the
speaker box 9 by the partition wall 913, 13 'is a front opening of the space 12 The small box 14
is guided by the rails 3 and 13 'so as to be vertically slidable. 4 is a front face of the small box 14:
a first fixed low mound 14; the small box 14 is a back cavity of the first small mound 4; 16 (?
small small box 14 optional It is a screw fixed in place. Thus, the present embodiment supports
the first dome 4 so as to be movable up and down. Next, the operation of this embodiment will be
described. When the listening point is 2 m from the speaker box 9, if the first dome 4 is 0.9 m
above the floor, the operation at this time is the same as the conventional example shown in FIG.
The sound pressure frequency characteristics at the listening point are flat. When the listening
point is 3 m from the speaker box 9, if the first dome 4 is moved to 1.297 F + on the floor, direct
waves and floor reflections The path difference between the wave and the knee 1 ии is 0.691 m,
the opposite phase at 249 Hz, 6 ?) ? 5, but this frequency does not cause a dip because it is the
band of the second rhombode 6 In the present embodiment, the second rhombode 5 is fixed, but
when the listening point distance is 3 m, the path difference between the direct wave and the
reflected wave is 0.266 m, and the opposite phase is 671 Hz. There is not. As described above,
according to the present embodiment, as long as the listening point is not too close to or too far
from the speaker, the height of the ROMED is adjusted to adjust the synthesis of the two ROMDs
to the listening even if the listening position is moved. The sound pressure frequency
characteristic can always be made flat as shown in FIG. 3. The present invention is not limited to
the six-way loudspeaker system shown in the above embodiment, but is applicable to various
other loudspeaker unit combinations. It will be obvious what is possible. The present invention is
not limited to the method of moving the speaker small box on the rail as shown in the abovementioned embodiment as the method of moving the speaker unit, and the same effect can be
obtained even if it is another method. For example, the movement can be substantially the same
effect even if it is discontinuous by replacing the speaker small box and the spacer 6 and so on.
In the above embodiment, although the first rhomboid 4 is movable, the tenth rhomboid 4 and
the second rhombode 6 may be movable.
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The speaker device according to the present invention is configured as described above, and
according to the present invention, it has the advantage that even when the listening point
changes, flat sound pressure frequency characteristics can be obtained in an anechoic chamber
and a real sound field with reflection. It is.
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