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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are sectional views of a conventional
port portion, FIG. 3 is a sectional view of the port of the present invention, and FIG. 4 is an
equivalent circuit of the present invention. 31 is a port main body, 32 is a small area of small
volume. Lower one street SF. 2 m one size 11 years old 4 l γ-111-
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of ports
in a phase-reversal speaker cabinet '. As shown in FIG. 1, the phase-reversal speaker cabinet nod
changes the phase of the sound wave emitted from the back of the speaker-1 using the cabinet
volume and the resonance of the mass of the port 2 provided on the front, the speaker-1 It is
intended to extend the bass reproduction band in phase with the sound wave emitted from the
front surface. Conventionally, the shape of the port 2 in such a phase inversion type speaker
cabinet 1 has been cylindrical or uniform in cross section. In the shape of port 2 like this, it is
taken as a mass as a lumped constant in the low frequency range, and can you obtain the desired
effect (increased bass reproduction ability) or the wavelength of the sound wave emitted from
the speaker? In the high frequency band smaller than the boat length f, the port 2 resonates as
an open tube and has the disadvantage of radiating unnecessary sound and degrading the
reproduced sound. Also, the isopolarity 1mpl of such a port is expressed as mpl = P-lSp (a ρ 空
気: air density, l is a port length, Sp is a port cross sectional area). Since it is extremely difficult to
change the equivalent mass over a wide range due to the shape, it is possible to obtain an
equivalent mass that is sufficient because it is not possible to reproduce a sufficient bass
reproduction. As a solution to this problem, there is a port (Japanese Patent Publication No. 4512670) in which the rear opening area is smaller than the port front opening area as shown in
FIG. 2). The equivalent mass mp of the port in this case is 3 mp, = pt-3i +% · p-1 · Sp (where n:
area ratio [0 n n 1 1], t is the length of the backward open Lj portion : Length of the front
opening, cross-sectional area of the Sl ° rear opening, cross-sectional area of the Sp front
opening), ie, in this case, it is possible to vary the amount of port homogeneity by the value of the
mouth, which is advantageous in design On the other hand, one can not avoid the deterioration
of the sound quality without improving the open tube wand Naruto East. This invention solves
the problems of the prior art example, and is provided with a portion 32 having a small L cross
section near the central portion of the port, and FIGS. 3 and 4 will be described in more detail
below. FIG. 3 is a cross-sectional view of the port according to the present invention, and when
the section 32 (Si) having a smaller cross section is provided in the middle part as compared with
the m + closed opening cross section 1lii product Sp of the port body 31 The one-turn circuit of
port 31 is shown in FIG. 4 and acts in conjunction with a low pass filter. Therefore, the port 31 of
this structure passes only the low frequency sound wave 4 and blocks the sound wave of the
high range to suppress the resonance of the port main body, and the low frequency sound wave
which is the original purpose of the phase inversion type speaker cabinet Since only the light is
emitted from the aperture, the bass reproduction ability can be remarkably improved without
causing the deterioration of the sound quality.
1) The isopolarity amount mp of the port 31 is represented by mp, -p4.SP4npt-S1 + 1 / p (J-/) Sp.
(However, 11. The length from the cross sectional area ratio to the rear opening, l ° port length,
t is the length of the cross sectional area ratio 32, SP: cross sectional area of the opening surface,
S1 cross sectional area 32 cross sectional area n: area Ratio C // S, 0 <n ≦ 1) As is apparent from
the above equation, the cross-sectional area ratio 32 increases the equi-polarity amount as
viewed from the diaphragm, thereby reducing the resonant frequency of the entire port? The low
frequency reproduction limit frequency can be lowered. In addition, since it is possible to change
the amount of isopolarity by changing the value of n, it is possible to design a large gain, and it is
possible to vary the cross section 5 area of the cross section area portion 32 to obtain a low
range. The characteristics can be changed freely, and the commercial value as a speaker system
is improved. As described below, the phase-reversal type speaker cabinet of this invention
prevents the resonance of the port body by providing a portion having a smaller cross-section
near the center of the port, and lowers the low frequency reproduction limit frequency to make it
well known. It has practical merits such as making it possible to change the cross-sectional area
as well as to make the cross-sectional area variable and to make it possible to perform the bass
enhancement action in the best state by making the cross section variable.
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