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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 show a bass reflex type speaker
system, wherein FIG. 1 a is a front view and FIG. 2 b is a side sectional view. FIG. 3 is a
perspective view showing only the duct of the bass reflex type speaker system. FIG. 4 is a
frequency characteristic diagram of a conventional bass reflex type speaker system, showing the
influence of a standing wave. FIG. 5 is an embodiment of the duct of the present invention, FIG. A
is a front view, and FIG. 5 is a cross-sectional view taken along the line X - X in FIG. FIG. 6 is
another embodiment of the present invention, in which a is a front view and FIG. 6 b is a
sectional view taken along line Y - X in FIG. FIG. 7, FIG. 8 and FIG. 9 are perspective views
showing another embodiment of the present invention. FIG. 10 is a sound pressure frequency
characteristic diagram inside a duct of a conventional bass reflex type speaker system. FIG. 11 is
a sound pressure frequency characteristic diagram inside the duct in the case where the standing
wave prevention member of this idea is provided. 1 ... enclosure, 2 ... duct, 3 ... speaker, 4 ...
standing wave preventing member, 5 ... supporting member. FIG. 2 '' FIG. 4 FIG. 3 + 1 FIG. 5, (Q)
DETAILED DESCRIPTION OF THE INVENTION Purpose of the Invention The purpose of the
present invention is to provide a backward wave of a speaker 3 radiated inside an enclosure as a
duct (port) of the same shape or a rectangular shape as shown in FIGS. 1 and 2, 2 to improve the
so-called bass-reflex type speaker system, Kwa, which phase-inverts through the enclarger and
discharges 1iK outside the enclosure. In the conventional bass-reflex type speaker system, there
are 7 points such as muddiness of sound in mid-range sound, small healing in frequency
characteristics, creation of figs, etc. due to the standing wave generated in the duct. Taking the
case of a square tact as shown in Fig. 3 as an example, each wave can be calculated as follows. f +
- soil "f 2 - soil, f 3 = - i - 211 zj 227 a where jl: rice of takuto, j 2: da ~ toyoya 1 jI 3 wing width
[wealth], 13 + duct height Megumi], C: sound velocity in air Lm / sec). These standing wave noise
1, f2. As shown in the rattan 4, f3 produces a peak and a dip at different frequencies of the
circumferential fluid response characteristic, but due to the direction of the sound wave passing
through the tact and its flow, the standing wave f + generated in the longitudinal direction of the
takt It is the thickest (it turns out to affect. Therefore, in the present invention, it is intended to
eliminate the standing wave which can not be avoided by the above-mentioned bassless type
speaker system, and to obtain the frequency characteristics of the weak and flat wheat flour in a
good middle range. FIG. 5 is a view showing one embodiment of the present invention, in which
the duct is cylindrical, the fat diagram shows the case where the duct is cylindrical, the X-X
sectional view of fishing gallery 1 company fm 1 . In the drawing, reference numeral 2 denotes a
tact, an inner cylindrical standing wave preventing member 4 having a smaller diameter than the
inner diameter of the 111 K tact is provided concentrically and is fixed by the supporting
member 5. Standing wave prevention part Shishi - yama ÷ iL Boo (made of 4 materials 4 sound
absorbing material, low foaming urethane, formed with m1 lll of acetate cool, or felt shaped etc,
utilize its sound absorbing effect It prevents reflection at frequencies, prevents standing waves,
and reduces high frequency components leaked from tact in combination with K. Next, the sound
pressure characteristics inside the tact when using the tact shown in Fig. 5 are compared with
the characteristics of the conventional tact. Fig. 10 shows the sound pressure frequency
characteristic diagram inside the takt when nothing is provided in the conventional tact, the duct
is a pipe of length of bai 7 + 50 cupboards, measured by attaching only the enclosure Kti woofer ,
And the line segment 2 in the characteristic diagram shows S (dSloct).
Fig. 1I r! ! 115 Square structure as shown in the figure, this is the sound pressure circumference l
& characteristic theory inside the duct using the standing wave prevention member of this idea,
and the tact is as same as in Fig. 10, the pipe length 3150 JIII It uses things and the enclosure is
defined by attaching only woofers and the line segment Z in the characteristic is not 6 [dBloct) so
it is "", -: C5. Comparing the physical properties of these two, the large deformation 11 near 1200
H 2 in Figure 1 is totally seen in Figure 11 and its surrounding properties are also ala 1, thick
and improved (° C It is thought that Ll for the characteristic by standing IIK has disappeared.
Fig. 6 shows a fire example where the tact is prismatic shape, ta 1 shows positive ii diagram, and
fb 1 shows the Y-Ylli surface in ia 1 figure. 2 in the drawing is the takt time There is a fixed
rectangular pillar 4 or supporting S material 5 which has a small rectangular pillar shape with
each side of the cross section corresponding to each side of the tact. - Figures 7 and 118 show
another embodiment In a perspective view. In the vicinity of both ends 2 and 2 of the duct 2, the
wall thickness is small or small (in the case of the seventh crown, thin), the wall thickness is the
thickest or large near the center P of the tact (in the case of FIG. 7, This example shows a circular
tact and a prismatic tact when the prevention member 4 is formed. By passing through the
middle part of the longitudinal gang of the tact where the energy of the standing wave
concentrates, pass through the passage 6 FIG. 9 is a perspective view showing still another
embodiment, the length of the standing wave prevention 94 is shorter than the length of the takt
IJ, and it is formed near the center in the longitudinal direction And the center of the standing
wave preventing member 4 formed so as to be thinnest in the vicinity of the image report is
made to coincide with the center P of the tact, and the influence on the tact volume is small, It is
a book that prevents the standing wave efficiently with the wave preventing member 4 Effect 5]
As stated above, according to the present invention, by providing a standing wave preventing
member in the tact of the bass reflex type speaker system, it is possible to prevent a standing
wave generated in the tact, It is possible to obtain a more flat characteristic than K by eliminating
disturbance of frequency 1% efficiency due to standing waves. By removing the standing wave,
the voiced sound in the mid range with the bus V 114 is reduced, and by forming the standing
wave preventing member with the g & sound material, it is possible to reduce the mid-to-high
sound of the woofer leaked from the duct It is possible to draw out only the effect of the original
low bass reinforcement.
Furthermore, by changing the shape, size, etc. of the standing wave preventing member, it is
possible to control the steel such as low frequency bony and bass reflex effect.
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description, jps5296631
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