JPH1132387

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DESCRIPTION JPH1132387
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus in which an acoustic tube for guiding a sound wave is connected to the front
of a speaker used for video equipment such as a television receiver, an automobile and various
audio equipment.
[0002]
A method of connecting a horn or an acoustic tube to the front of a speaker and guiding a sound
wave generated from the speaker to the opening of the acoustic tube has a large output sound
pressure as compared with the case where the horn or the acoustic tube is not used. There are
advantages such as being obtained and sound being transmitted in a specific direction, and so on,
which has been widely used conventionally.
[0003]
Hereinafter, a speaker device using a conventional acoustic tube will be described with reference
to the drawings.
FIG. 3 is a structural conceptual view of a television receiver incorporating the above-mentioned
conventional speaker device. In FIG. 3, 1 is an acoustic tube, 6 is a speaker, 18 is a television
cabinet, 19 is a cathode ray tube, 20 is a back cabinet, 21 is a sound conduit of the television
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cabinet 18.
[0004]
The operation of the television receiver incorporating the speaker apparatus configured as
described above will be described. As shown in FIG. 3, a speaker apparatus in which an acoustic
tube 1 for guiding a sound wave is coupled to a front portion of a speaker 6 is incorporated
along a cathode ray tube 19 inside a television receiver via a sound conduit 21 and a television
cabinet By making the structure 18 along the above-mentioned speaker device, it is possible to
miniaturize the television receiver.
[0005]
FIG. 2 is a structural conceptual view showing the configuration of the above-mentioned
conventional speaker device. In FIG. 2, 1 is an acoustic pipe for guiding the sound wave
generated from the speaker 6, 2 is a sound absorbing room in which a sound absorbing material
is appropriately sealed to suppress standing waves generated in the sound pipe 1, 3 is an airtight
cover for sealing the sound absorbing room 2. , 4 is a resonant port for adjusting the frequency
for suppressing the standing wave, and 5 is an acoustic pipe opening for generating a sound
wave guided from the acoustic pipe 1. The operation of the conventional speaker device
configured as described above will be described below.
[0006]
When an input signal is applied to the speaker 6, a sound wave is emitted from the opening 5 of
the acoustic tube 1 through the inside of the acoustic tube 1. However, since the acoustic
impedance is largely changed at the opening 5 of the acoustic tube 1, a part of the sound wave is
reflected and returned to the inside to make a standing wave, and a constant wave generated at
the length of the acoustic tube 1 Due to the presence of waves, the reproduced sound pressure
frequency characteristic of the peak-dip is extremely disturbed.
[0007]
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However, the sound absorbing chamber 2 having the resonance port 4 disposed inside the
acoustic tube 1 absorbs and suppresses the standing waves to create a flat reproduction sound
pressure frequency characteristic. As a result, natural acoustic reproduction can be performed by
the opening 5 of the acoustic tube 1 which is configured to be elongated and approximately
rectangular.
[0008]
However, in the above-described conventional configuration, the sound absorbing chamber 2
provided to suppress the standing wave generated inside the sound tube 1 is a specific television
including the sound conduit 21 of the television cabinet 18. The sound conduit 21 of the
television cabinet 18 is adjusted so as to suppress a specific standing wave generated by the total
length of the acoustic tube when the cabinet 18 is attached, and the attachment state of the
television cabinet 18 is changed. When the total length of the sound tube changes, the frequency
of the generated standing wave changes, so that the standing wave can not be suppressed in the
sound absorption chamber 2 and the reproduction frequency characteristic is deteriorated. In
addition, in order to flatten the reproduction frequency characteristics, it is necessary to use an
excessive sound absorbing material and adjust the reproduction frequency characteristics by
changing the speaker 6, which leaves problems in cost.
[0009]
SUMMARY OF THE INVENTION The present invention solves the above-described conventional
problems, achieves cost reduction by sharing an acoustic tube, and easily suppresses standing
waves, thereby achieving a speaker with excellent acoustic characteristics with flat reproduction
frequency characteristics. It is an object to provide an apparatus.
[0010]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker device of the
present invention comprises a speaker, an acoustic tube having a rectangular opening connected
to the front of the speaker, and a wall of the acoustic tube. A television receiver or the like is
provided with a separate sound absorption room provided with a side wall opening part provided
and being a side wall of the above-mentioned acoustic tube and having a port on the abovementioned side of the above-mentioned acoustic pipe. It is possible to cope with the change of
the standing wave very easily and inexpensively because it can be coped with simply by
mounting the sound absorption room corresponding to the change of the standing wave
frequency with the change of the attachment state with the set of .
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[0011]
According to a first aspect of the present invention, there is provided a speaker, an acoustic tube
having a rectangular shape with an opening coupled to the front of the speaker, and a side wall
provided on a wall of the acoustic tube. A separate sound absorption room having a surface
portion to be attached to the opening and serving as a side wall of the above-mentioned sound
tube and providing a port facing the above-mentioned sound tube on this surface portion Even if
the total length of the sound tube including the sound conduit due to the change is changed and
the generation frequency of the standing wave is changed, the sound tube is shared, and various
shapes using the dead space in the television set, It becomes possible to easily install standing
sound waves of various frequencies by appropriately mounting a sound absorption room of a
large size, it is possible to easily adjust the desired reproduction frequency characteristics, reduce
the sound absorption material, and use speakers Adjustment design time Reduction also realized,
achieving cost reduction, and reproduction frequency characteristics is one that can achieve a
superior speaker device of the acoustic characteristics become flat.
[0012]
Hereinafter, an embodiment of a speaker device of the present invention will be described with
reference to the drawings.
[0013]
FIG. 1 is an exploded perspective view of a speaker device according to an embodiment of the
present invention. The same parts as those of the conventional speaker device are denoted by the
same reference numerals and the description thereof will be omitted.
[0014]
According to the figure, 1a is an acoustic tube having a partial opening 1b in the side wall, 2a is a
sound absorbing chamber separate from the acoustic tube 1a, and an opening of the acoustic
tube 1a is formed in the sound absorbing chamber 2a. The resonance port 4 is provided on the
surface 2b to be attached and bonded to 1b, and the sound absorption chamber 2a is sealed by
the sealing cover 3a.
By arranging and bonding the sound absorbing chamber 2a to the acoustic pipe 1a, it is possible
to suppress standing waves according to the characteristics of the sound absorbing chamber 2a.
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[0015]
The operation of the loudspeaker apparatus of the present invention configured as described
above will be described below.
[0016]
First, when an input signal is applied to the speaker 6, the sound wave is radiated from the
opening 5a of the acoustic tube 1a through the inside of the acoustic tube 1a.
At that time, standing waves generated inside the total sound tube with the sound tube 1a and
the sound conduit of the television cabinet are suppressed in the sound absorption room 2a
having the resonance port 4 sealed by the sealing cover 3a.
[0017]
In addition, even if the total length of the acoustic tube including the sound conduit of the
television cabinet changes due to the change of the installation state of the television cabinet and
the generation frequency of the standing wave changes, the acoustic tube 1a is shared. Sound
absorption room 2 is set to various shapes and sizes using dead space inside the television set,
and sound absorption room 2a is arranged as different ones, so that suppression can be easily
performed in response to standing waves of various frequencies. Thus, it is possible to provide a
speaker device with excellent acoustic characteristics in which the cost can be reduced and the
reproduction frequency characteristic is flat.
Further, various reproduction frequency characteristics can be realized not only by flattening the
reproduction frequency characteristics but also by adjusting the sound absorption room.
[0018]
Further, by incorporating the speaker device of the present invention in a television receiver, it is
possible to easily realize the downsizing and slimming of the television receiver, and to provide a
high-performance, high-quality television receiver.
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[0019]
The same effect can be obtained even when the rear cabinet and the bass reflex port are
provided in the speaker device configured by the structure of the acoustic tube of the present
invention.
[0020]
According to the speaker device of the present invention, the total length of the sound tube
including the sound conduit of the set changes due to the change of the attachment state with
the set of the television cabinet etc., and the generation frequency of the standing wave changes.
Even if the sound tubes are shared, the standing waves of various frequencies can be easily
suppressed by appropriately installing and mounting sound absorbing rooms of various shapes
and sizes using the dead space inside the TV set. It is possible to easily adjust the desired
reproduction frequency characteristics, reduce the sound absorption material, realize the
reduction of design time such as adjustment by the speaker, achieve cost reduction, and make
the reproduction frequency characteristics flat. It is possible to realize a speaker device having
excellent acoustic characteristics.
[0021]
Brief description of the drawings
[0022]
1 is an exploded perspective view of a speaker device according to an embodiment of the present
invention
[0023]
Fig. 2 A perspective view of the conventional speaker device
[0024]
Fig. 3 A structural conceptual diagram of a television receiver incorporating a speaker device
using a conventional sound tube
[0025]
Explanation of sign
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[0026]
1a Acoustic tube 1b Side wall opening 2a Sound absorbing chamber 3a Sealed cover 4 Resonant
port 6 Speaker
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