JPH03145896

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DESCRIPTION JPH03145896
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus, and more particularly to a bass reproduction apparatus capable of
effectively reproducing a bass range. FIG. 3 is a plan sectional view of a conventional bass
reproduction apparatus. The bass reproduction apparatus includes a cabinet 1, an acoustic filter
2, and a speaker 5. The cabinet 1 is a closed cabinet. An opening is provided in one of the side
walls constituting the cabinet 1, and the speaker 5 is attached to the opening. The acoustic filter
2 is attached to the side wall of the cabinet 1 to which the speaker 5 is attached. The acoustic
filter 2 comprises a sheath 3 and a duct 4. An opening is provided in one of the side walls
constituting the sheath portion 3, and the duct 4 is fitted into the opening. The sheath 3 and the
duct 4 are both hollow inside. In such a conventional bass reproduction apparatus, by designing
the resonance frequency of the acoustic filter 2 to be lower than the reproduction limit frequency
of the sound radiated from the speaker 5, among the sounds radiated from the speaker 5, The
sound pressure level near the resonance frequency is raised by resonance, as a result, the bass
range of the sound radiated from the duct 4 is emphasized. [Problem to be Solved by the
Invention] By the way, in the conventional bass reproducing apparatus of the above-mentioned
constitution, the reproduction limit frequency is determined by the reproduction limit frequency
of the closed cabinet 1. That is, when the frequency characteristic of the closed cabinet 1 is
designed to be the most preferable characteristic, assuming that the reproduction limit frequency
of the bass reproduction apparatus without the acoustic filter 2 is 110 Hz, the effectiveness of
the bass reproduction apparatus with the acoustic filter 2 attached The reproduction limit
frequency was approximately 100 Hz 捏 (see Fig. 2 fL ++ characteristics 1). Therefore, effective
regeneration is difficult for frequencies lower than the regeneration limit frequency of 100 Hz
determined based on the characteristics of the cabinet 1 described above. Therefore, the present
invention has been made to solve such problems. An object of the present invention is to provide
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a bass reproduction apparatus capable of lowering the reproduction limit frequency. [Means for
Solving the Problems] In the bass reproduction apparatus according to the present invention, the
cabinet is provided with an acoustic wave emission port separately from the speaker, and the
acoustic wave emitted from the acoustic wave emission port also passes through the acoustic
filter. It is characterized by having done. [Operation] The low-pitched sound reproduction
apparatus according to the present invention is provided with an acoustic radiation port in the
cabinet. For this reason, the reproduction limit frequency can be lowered compared to a bass
reproduction apparatus using a closed cabinet of the same volume.
Therefore, in the conventional bass reproduction apparatus, the bass reproduction apparatus
according to the present invention can perform effective reproduction even in the sound range of
the frequency where effective reproduction can not be performed even if the acoustic filter is
used. Embodiment An embodiment of a bass reproduction apparatus according to the present
invention will be described. FIG. 1 is a plan cross-sectional view of a bass reproducing apparatus
according to the present invention. The bass reproduction apparatus comprises a cabinet 11, an
acoustic filter 12, and a speaker 15. An opening and a duct 16 are provided in one of the side
walls constituting the cabinet 11. A speaker 15 is attached to the opening. One end of the duct
16 is in the cabinet 11 and the other end is fitted in the side wall of the cabinet 11. The other
end of the duct 16 is an acoustic wave radiation port 17, and the cabinet 11 is a so-called phasereversal type. The acoustic filter 12 is attached to the side wall of the cabinet 11 to which the
speaker 15 and the duct 16 are attached. The acoustic filter 12 comprises a sheath 13 and a duct
14. An opening is provided in one of the side walls constituting the sheath 13 and one end of the
duct 14 is fitted into the opening. The other end of the duct 14 is outside the sheath 13. Both the
sheath 13 and the duct 14 are hollow inside. Since the bass reproducing apparatus according to
the present invention is configured as described above, the reproduction limit frequency of the
sound radiated from the speaker 15 and the sound wave emission port 17 is the same volume
sealing by the action of the sound wave emission port 17. It is lower than the reproduction limit
frequency of the bass reproduction device using the form cabinet. That is, since the synthetic
sound pressure of the sound pressure from the front surface of the speaker 15 and the sound
pressure from the front surface of the sound wave emission port 17 is manually applied to the
acoustic filter 12, as shown by the characteristic in FIG. In addition, the low frequency
reproduction limit frequency can be lowered to fl2. Characteristic 2 is that of a conventional bass
reproduction apparatus using a closed cabinet. Assuming that the reproduction limit frequency in
the case of using the closed cabinet is fl and the reproduction limit frequency in the case of using
the phase-reversal-type cabinet and node is f2, if the cabinet of the same volume is used, f2-1 / J.
f, It is known that it is possible to lower f2 (quoted from "Speaker system" Takeo Yamamoto
Radio Technology Co., Ltd. S52.7.15 first edition Chapter 8 cabinet p269). Therefore, the
reproduction limit frequency can be lowered by 1 / # as compared with the case of using a
closed cabinet of the same volume.
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In this embodiment, a phase inversion type cabinet is used as the cabinet. However, the present
invention is not limited to this, and a passive radiator type cabinet which is a variation of a phase
inversion type cabinet may be used. Also in this embodiment, the sound wave emitted from the
speaker and the sound wave emitted 11-1 from the g-wave radiation port are made to pass
through the same 'g echo filter. However, the present invention is not limited to this, and the
acoustic filter through which the sound wave emitted from the speaker passes and the acoustic
filter through which the sound wave radiated from the sound emission port may pass may be
independent of each other. . [Effect] The low reproduction apparatus according to the present
invention has the cabinet provided with a sound emission port separately from the speaker.
Accordingly, even if the conventional cabinet with the closed cabinet is the same as the
conventional cabinet with the conventional bass reproduction apparatus, the regenerated eye
light frequency can be lowered.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a plan sectional view of an embodiment of a bass reproducing apparatus according to
the present invention.
FIG. 2 is a graph showing the relationship between the frequency and the sound pressure level
and the bell of an embodiment of the conventional bass reproducing apparatus and the bass
reproducing apparatus according to the present invention. FIG. 3 is a plan cross-sectional view of
a conventional bass reproduction apparatus. In the figure, 11 indicates a cabinet, 12 indicates an
acoustic filter, 15 indicates a speaker, and 17 indicates a sound wave emission port. Sound
Figure 2 Figure 3
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