JPS60158795

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DESCRIPTION JPS60158795
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
cabinet for a speaker system, and in particular, a cabinet capable of suppressing generation of
standing waves inside the cabinet and at the same time flattening output sound pressure
frequency characteristics as a speaker system. It relates to the shape. [Prior Art] FIG. 1 is a
perspective view showing a conventional speaker cabinet. In FIG. 1, (1) is a single speaker, (2) is
a rectangular parallelepiped cabinet to which the single speaker (1) is attached, and (3) is Panful
face of this cabinet (2). The single speaker (-) (1) is disposed on the center line (ioo) of the baffle
surface (3) and radiates sound waves (i'o), (m), (12) at the same time as the cabinet (on the back)
The interior space of 2) is acoustically driven. In FIG. 1, the sound wave emitted from the single
speaker (1) is a direct sound (1 o) or a diffracted sound (11). It becomes (12) and reaches the
sound receiving A (4). FIG. 2 shows these sound wave propagation paths divided into the direct
sound (1o) and the diffracted sound (11) and (12) of the cabinet edge portion (4). By the way,
since the single speaker (1) is located on the baffle surface (3 ° center line (100), the diffracted
sound (11 [and the sound wave propagation to the sound receiving point (A) of the diffracted
sound (12) The distances are equal. Therefore, the distance difference due to the sound receiving
point (A) and the teno diffracted sound (11), (12) and the direct sound (1o) tono sound wave
propagation which are at a sufficiently long distance is almost L, so L is L = (2n-1 ) Λ / 2 (n =
1.2, 3. -) When-(1), the direct sound (10) and the diffracted sounds (II) and (12) cancel each
other, and L = nλ (nm = 1.2, 3. -) = (2) is added (however, λ represents a wavelength). This
means that the output sound pressure frequency characteristic at the sound receiving point
repeats peaks and valleys corresponding to n, and indicates that it is inappropriate as the
characteristic of the speaker system for which the flat characteristic is desired. ing. On the other
hand, at the back of the single speaker (1), a standing wave (m = 1.2.3 ..) as shown in FIG. 3 is
generated with respect to the width 2L of the baffle surface (3). However, since the single
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speaker (1) is located at the center of the horizontal width 2L, the node of the standing wave is
driven, and the m · is not excited in fact for the standing wave of odd order. Therefore, the
arrangement of the single speaker (1) as shown in FIG. 3 has the effect of suppressing the
occurrence of standing waves.
In FIG. 3, the vertical axis indicates the normalized sound pressure level inside the cabinet (2). 6
As described above, with the cabinet shape and the arrangement of single speakers in the
conventional speaker system, generation of standing waves is On the other hand, there is a
drawback that the output sound pressure frequency characteristic is disturbed by the diffraction
of the sound wave. SUMMARY OF THE INVENTION The present invention has been made to
solve the above-mentioned problems, such that the baffle surface is flush with the main cabinet
on at least one side in the lateral or vertical direction of the rectangular main cabinet. By
providing the auxiliary cabinet, it is possible to provide a speaker cabinet which can suppress the
generation of standing waves in the cabinet as before and at the same time reduce the
disturbance of the output sound pressure frequency characteristic due to the diffraction of sound
waves. FIG. 4 is a perspective view showing a speaker cabinet according to an embodiment of the
present invention. In the figure, the same reference numerals as in FIGS. 1 to 3 designate the
same or corresponding parts. 4 differs from FIG. 1 in that the auxiliary cabinet (5) is on one
lateral side of the main cabinet (2a) and the baffle surface is flush with the baffle surface (3) of
the main cabinet (2a). It is to be provided in the following manner. The auxiliary cabinet (5) is a
hollow or spaceless structure independent of the main cabinet (2a), and may be fixed to the main
cabinet (2a) as shown in FIG. 4, or the main cabinet (2a) And may be integrally molded. In the
speaker cabinet configured as described above, since the acoustic space at the back of the single
speaker (1) is the same as that in the case of FIG. 1, the occurrence of odd-order standing waves
is suppressed. Also, with regard to the sound wave radiated forward from the single speaker (1),
since the difference in distance due to the sound wave propagation of the diffracted sound (11),
<12) to the sound receiving point (A) is different And diffracted sound (11). The interference with
(12) is dispersed, and the disturbance on the output sound pressure frequency characteristic is
reduced. FIG. 5 is a comparison of the characteristic (8) of the conventional speaker system and
the characteristic (9) of the speaker system according to the cabinet of the present invention in
order to show the above effects with respect to the output sound pressure frequency
characteristic. Clearly indicate that. FIG. 6 is a perspective view showing another embodiment,
and when two auxiliary cabinets (6) and (7) are provided on one side of the main cabinet (2a) in
the horizontal and vertical directions respectively, the output sound is further output.
Disturbances in pressure characteristics are reduced.
In FIG. 6, the auxiliary cabinets (6) and (7) are structures independent of the main cabinet (2a) as
in FIG. 4, and the acoustic space at the back of the single speaker (1) is the structure of FIG. Since
it is identical to the case, the occurrence of odd-order standing waves can be suppressed. When
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the single speaker (1) is located at the center of the baffle surface (3), ie, at the center of each of
the width 2L and the height 2H, the X direction center line (101) and the X direction center line
(100) In this case, generation of odd-order standing waves can be suppressed not only in the X
direction but also in the X direction. With regard to the sound waves radiated forward from the
single speaker (1), since the distance by sound wave propagation to the sound receiving point (A)
of each diffracted sound (11) to (14) can be made different, direct sound (10) Interference with
the diffracted sound (11) to (I4) is dispersed, and random noise on the output sound pressure
frequency characteristic is further reduced. 7 to 9 are perspective views showing other
embodiments, and (6a), (6b) and (7a), (7b) are provided on both sides in the lateral or vertical
direction of the main cabinet (2a). Auxiliary cabinets, each having a different width L1 y L2 or
height H1 r H2. The distance from the center line of the main cabinet (2a) to the end of the
auxiliary cabinets (6a), (6b), (7-a), (7b) is different. The number of auxiliary cabinets is one. In
any case, since it is basically the same as the case of using 51 or 2 auxiliary cabinets, generation
of odd-order standing waves in the acoustic space at the back of the single speaker (1) For the
sound waves radiated forward, by reducing the distance difference between the sound wave
propagation of each diffracted sound, the disturbance on the output sound pressure frequency
characteristic due to the interference between the direct sound and the diffracted sound is
reduced. I can do it. In each of the above embodiments, the shape of the auxiliary cabinet is
triangular in cross section, but it may be any other shape. [Effects of the Invention] As described
above, the speaker cabinet according to the present invention has a structure in which a single
speaker is disposed on the center line or center of the baffle surface, and further, one or more
side faces of the auxiliary cabinet And the sound propagation time of each diffracted sound up to
the sound receiving point is configured to be different, so that it is possible to suppress the
occurrence of odd-order standing waves generated instantaneously inside the cabinet, and to
output sound pressure frequency It has the effect of reducing the disturbance of the
characteristics.
[0002]
Brief description of the drawings
[0003]
-Fig. 1 is a perspective view showing a conventional speaker cabinet, Fig. 2 is a sectional view
thereof, Fig. 3 is a relationship diagram between a standing wave generated inside the cabinet
and the arrangement of single speakers, Fig. 4 is a present FIG. 5 is a perspective view showing a
speaker cabinet according to an embodiment of the present invention, FIG. 5 is a characteristic
comparison diagram of output sound pressure frequency characteristics by the speaker cabinet
of the present invention and output sound pressure frequency characteristics by the
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conventional speaker cabinet, 6 to 9 are perspective views showing other embodiments.
In the figure, (1) is a single speaker, (2) is a cabinet, (2a) is a main cabinet, (3) is a baffle surface,
(4) is a cabinet j (l), (5), (6), C6a) , (6b). (7), (7a) and (7b) are auxiliary cabinets. In the drawings,
the same reference numerals denote the same or corresponding parts. Agent Oiwa Masuo
District-邊 d,-ml Δ '(士 Δ ■ ■) is (male) 截
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