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JPH03145898

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DESCRIPTION JPH03145898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
stereo reproduction apparatus, and more particularly to a bass stereo reproduction apparatus for
selectively reproducing bass in stereo. PRIOR ART FIG. 5 is a plan sectional view of a
conventional bass stereo reproduction apparatus. The bass stereo reproduction device comprises
an L channel reproduction device 1 and an R channel reproduction device 2. The L channel
reproduction device 1 includes a cabinet 3, a speaker 4 and an acoustic filter 5. The cabinet 3 is
a closed cabinet. A speaker mounting opening 6 is provided on one of the side walls constituting
the cabinet 3. A speaker 4 is attached to the speaker attachment opening 6. The speaker 4 is
attached such that the front surface of the speaker 4 is exposed to the outside of the cabinet 3.
The use of the closed type as the cabinet 3 has the following advantages. When listening to the
sound at the front of the speaker 4, when the sound wave from the back comes to the front, it
interferes with the sound wave from the front and the cancellation sound becomes smaller. This
tendency is remarkable in the low range. When a closed cabinet is used as the cabinet 3, the
sound wave from the back is contained in the cabinet 3, which can prevent such a situation. The
gg filter 5 comprises a buttock 11 and a duct 12. By appropriately designing the duct length, the
duct cross-sectional area, and the volume of the buttocks excluding the duct, the acoustic filter 5
selectively passes the required bass range. The R channel reproduction device 2 is the same as
the L channel reproduction device ¥ 1 and the description thereof is omitted. However, the R
channel signal is manually input to the speaker 4 of the R channel reproduction device 2.
[Problems to be Solved by the Invention] However, in the conventional system shown in FIG. 5, if
the volume of the closed cabinet 3 mounted on the rear side of the speaker 4 can not be made
sufficiently large, the bass reproduction band is sufficiently low. There is a problem that it is
difficult to extend to the range or the sound pressure level in the low range becomes low.
Therefore, as a solution to such a problem, there is a bass reproduction apparatus as shown in
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FIG. In this bass reproduction apparatus, the cabinet of the first channel reproduction apparatus
and the cabinet of the second channel reproduction apparatus are common cabinets. Hereinafter,
this bass reproduction device will be described. The bass reproduction apparatus comprises a
cabinet 15, speakers 16.17, and an acoustic filter 18. The cabinet 15 is a closed cabinet.
One of the side walls constituting the cabinet 15 is provided with a speaker mounting opening
19.20. A speaker 16 is attached to the speaker attachment opening 19. The speaker 16 is
attached so that the front surface of the speaker 16 is exposed to the outside of the cabinet 15.
The L channel signal is manually input to the speaker 16. A speaker 17 is attached to the speaker
attachment opening 20. The speaker 17 is attached so that the front surface of the speaker 17 is
exposed to the outside of the cabinet 15. The R channel signal is manually input to the speaker
17. The g'll filter 18 comprises a ridge 29 and a duct 30. In the low-pitched sound reproducing
apparatus shown in FIG. 6, the cabinet in which the speaker 16 is accommodated and the cabinet
in which the speaker 17 is accommodated are a common cabinet 15. For example, if the volume
of the cabinet 15 is the sum of the volume of the cabinet 3 of the L channel playback device of
the bass stereo playback device and the volume of the cabinet 3 of the R channel playback device
shown in FIG. When a band signal is input, the bass reproduction apparatus shown in FIG. 6 can
lower the reproduction limit frequency more than the bass stereo reproduction apparatus shown
in FIG. However, in the bass reproducing apparatus shown in FIG. 6, both the sound wave emitted
from the speaker 16 and the sound wave emitted from the speaker 17 pass through the acoustic
filter 18. For this reason, the sound waves coming out of the sound emission port 31 become
monaural, and stereo reproduction can not be performed. Therefore, the present invention has
been made to solve such conventional problems. An object of the present invention is to provide
a bass stereo reproduction apparatus capable of stereo reproduction and capable of reducing the
reproduction limit frequency. Means for Solving 11m: The bass stereo reproduction device
according to the present invention has a first channel reproduction device and a second channel
reproduction device. The first channel reproduction device comprises: a cabinet attached with a
speaker for converting the first channel signal into a sound wave; and an acoustic filter for
selectively passing a bass range among sound waves radiated from the speaker There is. The
second channel reproduction apparatus comprises: a cabinet attached with a speaker for
converting the second channel signal into a sound wave; and an acoustic filter for selectively
passing a low frequency band of the sound wave emitted from the speaker There is. The bass
stereo reproduction apparatus according to the present invention is characterized in that the
cabinet of the first channel reproduction apparatus and the cabinet of the second channel
reproduction apparatus are in communication with each other.
In the bass stereo reproduction apparatus according to the present invention, the cabinet of the
first channel reproduction apparatus is in communication with the cabinet of the second channel
reproduction apparatus. Therefore, the speaker of the first channel reproduction device is
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accommodated in a cabinet of a size obtained by adding the cabinet of the first channel
reproduction device and the cabinet of the second channel reproduction device. For this reason,
the volume of the cabinet of the first channel reproduction device of the bass stereo reproduction
device according to the present invention is larger than the volume of the cabinet of the first
channel reproduction device of the conventional bass stereo reproduction device shown in FIG.
Become. For this reason, the reproduction limit frequency of the first channel reproduction
apparatus of the bass stereo reproduction apparatus according to the present invention is the
conventional bass stereo reproduction shown in FIG. 5 when the low band signal is inputted only
to this channel. It is lower than the reproduction limit frequency of the channel regenerating
device of the device 昂 1. The same is true for the second channel reproduction device of the
bass stereo reproduction device according to the invention. Also, since the bass stereo
reproduction device according to the present invention is separate from the acoustic filter
provided in the first channel reproduction device and the acoustic filter provided in the second
channel reproduction device, stereo reproduction is possible. FIG. 1 is a plan sectional view of a
first embodiment of a bass stereo reproduction apparatus according to the present invention. The
first embodiment of the bass stereo reproduction apparatus according to the present invention
comprises a cabinet 41, a speaker 42.43 and an acoustic filter 44.45. The cabinet 41 is a closed
cabinet. A speaker mounting opening 46. 47 is provided in one of the side walls constituting the
cabinet 41. A speaker 42 is attached to the speaker attachment opening 46. The speaker 42 is
attached so that the front surface of the speaker 42 is exposed to the outside of the cabinet 41.
The speaker 42 reproduces the L channel. A speaker 43 is attached to the speaker attachment
opening 47. The speaker 43 is attached such that the front surface of the speaker 43 is exposed
to the outside of the cabinet 41. The speaker 43 reproduces the R channel. The acoustic filter 44
comprises a sheath 56 and a duct 57. The acoustic filter 44 is designed to selectively pass the
required bass range. The cabinet 41, the speaker 42, and the acoustic filter 44 constitute an L
channel reproduction device.
The acoustic filter 45 comprises a sheath 59 and a duct 60. The acoustic filter 45 is designed to
be the same as the acoustic filter 44. The cabinet 41, the speaker 43, and the acoustic filter 45
constitute an R channel reproduction device. The acoustic filter 44 and the acoustic filter 45 have
a common side wall 62. In this embodiment, the L channel reproducing device and the R channel
reproducing device share the cabinet 41. Therefore, the volume of the cabinet 41 is equal to the
sum of the volume of the cabinet 3 of the L channel reproduction device of the conventional bass
stereo reproduction device shown in FIG. 5 and the volume of the cabinet 3 of the R channel
reproduction device. Therefore, according to this embodiment, when the low band signal is input
to only one channel, the reproduction limit frequency can be lowered compared to the
conventional bass stereo reproduction apparatus shown in FIG. Further, the sound wave emitted
from the speaker 42 reproducing the L channel passes through the acoustic filter 44. The sound
wave emitted from the speaker 43 for reproducing the R-two tunnel passes through the acoustic
filter 45. Therefore, according to this embodiment, stereo reproduction becomes possible. A
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second embodiment of a bass stereo reproduction apparatus according to the present invention
will be described. FIG. 2 is a plan sectional view of a second embodiment of the bass stereo
reproduction apparatus according to the present invention. The difference from the first
embodiment is that the cabinet 41 is provided with a support plate 66 having an opening 67. As
a result, the cabinet 41 is divided into an L channel cabinet 68 and an R channel cabinet 69, but
the openings 67 allow the speakers 42.43 to be the same as sharing the cabinet. A third
embodiment of a bass stereo reproduction apparatus according to the present invention will be
described. FIG. 3 is a plan sectional view of a third embodiment of the bass stereo reproduction
apparatus according to the present invention. The third embodiment of the bass stereo
reproduction apparatus according to the present invention comprises a cabinet 71, speakers
72.73 and an acoustic filter 74.75. On the side wall of the cabinet 71, speaker attachment phase
opening rollers 77 and an opening lower 8 are provided. A speaker 72 is attached to the open
phase of the speaker attachment phase. The speaker 72 receives an L channel signal. A speaker
73 is attached to the speaker attachment phase open lower 7. The R channel signal is manually
input to the speaker 73. Of the side walls constituting the cabinet 71, an acoustic filter 74.75 is
mounted on the side walls provided with the speaker mounting phase open rotors 77 and the
open lower 8.
The acoustic filter 74 comprises a sheath portion 87 and a duct 88. One end of the duct 88 is an
acoustic radiation port 89. The acoustic filter 75 comprises a sheath 90 and a duct 91. One end
of the duct 91 is an acoustic radiation port 92. The sound wave radiated from the speaker 72
passes through the acoustic filter 74. The sound wave emitted from the speaker 73 passes
through the acoustic filter 75. The cabinet 71 has a phase inversion type cabinet structure, and a
duct 95 is attached to the open lower 8 of the cabinet 71. An acoustic filter 97 is formed of the
cabinet 71 and the duct 95. The condition of the sound pressure characteristics will be described
with respect to an example in which the target frequency of the acoustic filter 74.75 is
approximately 150 Hz and the resonance frequency of the acoustic filter 97 is approximately 50
Hz. FIG. 4 is a graph showing the relationship between the frequency (Hz) and the relative sound
pressure level (dB) of the third embodiment of the bass stereo reproduction apparatus according
to the present invention. The relationship between the frequency of the sound wave emitted from
the acoustic filter 74.75 and the relative sound pressure level is represented by a curve indicated
by a. The relationship between the frequency of the sound wave emitted from the acoustic filter
97 and the relative sound pressure level is represented by a curve indicated by b. The curve
indicated by C is a combination of the curve indicated by a and the curve indicated by b taking
into account the phase components, that is, the relationship between the frequency and the
sound pressure relative level of this bass stereo reproduction apparatus. As shown in FIG. 4, the
sound wave near 50 Hz is mainly emitted from the sound emission port 96. Sound waves of 60
to 300 Hz are mainly emitted from sound wave radiation r189.92. Therefore, according to the
third embodiment, sound waves of relatively high frequency which can easily recognize
localization (direction of sound image) of the bass are reproduced in stereo from eight sound
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wave emission ports 92. Further, sound waves of relatively low frequencies which are difficult to
recognize localization among the low tones are reproduced in monaural from the sound emission
port 96. Further, in the third embodiment, since the duct 95 is attached to the cabinet 71, the
cabinet 71 functions as a phase inversion cabinet. Therefore, in the third embodiment, the sound
pressure level near the lower limit frequency becomes higher than when the closed cabinet is
used, and the bass can be effectively reproduced. Another example of a cabinet that can be used
in the third embodiment is a passive radiator type cabinet. In the first, second, and third
embodiments, two-channel stereo reproduction is performed. However, the present invention is
not limited to this, and three-channel stereo reproduction and four-channel stereo reproduction
may be performed.
[Effect] The bass stereo reproduction apparatus according to the present invention brings the
cabinet of the first channel reproduction apparatus into communication with the cabinet of the
second channel reproduction apparatus. Therefore, the speaker of the first channel reproduction
device is accommodated in a cabinet of a size obtained by adding the cabinet of the first channel
reproduction device and the cabinet of the second channel reproduction device. For this reason,
the volume of the cabinet of the first channel reproduction device of the bass stereo reproduction
device according to the present invention is larger than the volume of the cabinet of the first
channel reproduction device of the conventional bass stereo reproduction device. For this reason,
the reproduction eye-field frequency of the first channel reproduction device of the bass stereo
reproduction device according to the present invention is the first of the conventional bass stereo
reproduction devices when the low band signal is manually input only to the first channel. It
becomes lower than the reproduction limit frequency of the channel reproduction device, and
can reproduce high-H sound even for sounds of lower frequencies. The same is true for the
second channel reproduction device of the bass stereo reproduction device according to the
invention. Further, since the bass stereo reproduction device according to the present invention
is separate from the acoustic filter provided in the first channel reproduction device and the
acoustic filter provided in the second channel reproduction device, stereo reproduction is
possible.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a plan sectional view of a first embodiment of a bass stereo reproduction apparatus
according to the present invention.
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FIG. 2 is a plan sectional view of a second embodiment of the bass stereo reproduction apparatus
according to the present invention. FIG. 3 is a plan sectional view of a third embodiment of the
bass stereo reproduction apparatus according to the present invention. FIG. 4 is a diagram
showing a graph showing the relationship between the relative sound pressure level and the
frequency in the third embodiment of the bass stereo reproduction apparatus according to the
present invention. FIG. 5 is a plan sectional view of a conventional bass stereo reproduction
apparatus. FIG. 6 is a plan cross-sectional view of a conventional bass reproduction apparatus. In
the figure, 41 indicates a cabinet, 42.43 indicates a speaker, 44.45 indicates an acoustic filter, 67
indicates an opening, 71 indicates a cabinet, 72.73 indicates a speaker, and 74.75 indicates an
acoustic filter. Figure 1 Figure 2 Figure 3 3 Figure 4 Figure 11 Tomakomai (out)
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