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JPH07203577

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DESCRIPTION JPH07203577
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus which is used in a video apparatus such as a television receiver and has an
acoustic tube coupled to the front of the speaker.
[0002]
2. Description of the Related Art A method of providing a horn or an acoustic tube on the front of
a speaker and guiding a sound wave generated from the speaker to the opening provides a large
output sound pressure as compared to the case where the horn or the acoustic tube is not used.
There is an advantage that sound is transmitted in a specific direction, etc., and it has been
widely used conventionally.
[0003]
Hereinafter, a speaker device using a conventional acoustic tube will be described with reference
to the drawings.
FIG. 5 is a structural conceptual view of a television receiver incorporating the above speaker
device. In FIG. 5, 1 is an acoustic tube, 8 is a speaker unit, 26 is a television cabinet, 27 is a
cathode ray tube, and 28 is a back cavity.
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1
[0004]
The operation of the television receiver incorporating the speaker apparatus configured as
described above will be described. As shown in FIG. 5, a speaker device in which an acoustic tube
1 for guiding a sound wave to the front part of the speaker unit 8 is disposed along a cathode ray
tube 27 inside a television receiver, and further the television cabinet 26 is the speaker device By
adopting the structure according to the above, it is possible to miniaturize the television receiver.
[0005]
FIG. 4 is a plan sectional view showing the configuration of the above-mentioned conventional
speaker device. In FIG. 4, 9 is a vibrating portion of the speaker unit 8 for generating a sound
wave, 10 is an edged rib for sealingly coupling the speaker unit 8 and the acoustic tube 1, and 7
is a throat narrowing portion provided on the front portion of the speaker unit 8. , 5 and 6 are a
first reflector and a second reflector provided on both sides respectively for guiding the sound
wave emitted from the speaker unit 8 to the opening 3 of the acoustic tube 1, 2 is a sound
absorbing material There is a sound path 4 through which the sound wave passes.
[0006]
The operation of the conventional speaker device configured as described above will be
described below. First, when an input signal is applied to the speaker unit 8, the diaphragm 9 of
the speaker unit 8 vibrates, and the sound wave is emitted from the opening 3 of the sound tube
1 through the sound path 4 inside the sound tube 1. .
[0007]
However, since the acoustic impedance is largely changed at the opening 3 of the acoustic tube
1, a part of the sound wave is reflected and returned to the sound path 4 to make a standing
wave, and generation occurs at the length of the acoustic tube 1 Due to the standing wave, the
reproduced sound pressure frequency characteristic of the peak-dip is extremely disturbed.
[0008]
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However, the sound absorbing material 2 disposed inside the acoustic tube 1 absorbs and
suppresses the standing waves to create a flat reproduction sound pressure frequency
characteristic.
That is, the sound absorbing material 2 plays an important role on the reproduction principle of
this type of speaker device.
[0009]
Further, the first reflection plate 5 and the second reflection plate 6 are disposed so that the
sound emitted from the diaphragm 9 of the speaker unit 8 and enhanced by the narrowing
portion 7 of the throat is not directly absorbed by the sound absorbing material 2. In particular,
it also works for mid-range correction. As a result, natural acoustic reproduction can be
performed by the opening 3 of the acoustic tube 1 which is configured to be elongated and
substantially rectangular.
[0010]
However, in the above-described conventional configuration, as shown in FIG. 4, the sound wave
of the mid-high range component is generated by a large amount of the sound absorbing
material 2 provided to suppress the standing wave generated inside the acoustic tube 1. It had
the problem that it was absorbed up and the sound pressure would fall. And the 1st reflecting
plate 5 and the 2nd reflecting plate 6 are provided in order to prevent this phenomenon. FIG. 3
shows reproduced sound pressure frequency characteristics of the above-mentioned
conventional speaker device. Among them, the solid line 24 is the conventional characteristic, but
it is not sufficient to prevent the sound pressure drop in the middle and high frequencies as seen
by the curve 24. Furthermore, the reproduced sound pressure frequency characteristic is
disturbed and the characteristic is a lot of peak dips. There was also a problem that speech
intelligibility was reduced. Moreover, in order to suppress standing waves, a large amount of the
sound absorbing material 2 has to be used, and a problem has been left in terms of cost.
[0011]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional
problems, and aims to improve the clarity of sound and the sound pressure, and to provide a
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speaker device having excellent acoustic characteristics in which reproduced sound pressure
frequency characteristics become flat. Purpose.
[0012]
SUMMARY OF THE INVENTION In order to solve this problem, the speaker apparatus of the
present invention couples an acoustic tube having an opening to the front of the speaker, and the
acoustic tube is provided with the acoustic tube from the front side of the speaker inside. In the
sound path toward the opening, a pair of first reflectors is provided having a certain length and
connected to the side wall, and between the first reflector and the side wall of the acoustic tube
and the first A pair of second reflectors extending from the front of the speaker so that the end
comes to the opening side of the acoustic tube from the beginning of the reflector, and the gap
between the first reflector and the second reflector Are configured to have a constant distance.
[0013]
According to this configuration, the first reflector and the second reflector installed inside the
acoustic tube are also provided in the speaker device having the horn and the acoustic tube
having an elongated rectangular shape with an opening in consideration of the incorporation into
the device. The space formed between the side wall of the acoustic tube and the space formed
between the first reflector and the second reflector respectively resonate to absorb the standing
waves, thereby absorbing human voice. It becomes possible to improve the sound pressure of
500 to 5 kHz, which is an important frequency band to be configured, and it is possible to realize
the improvement of the intelligibility of sound which can not be realized by the conventional
product.
[0014]
In particular, by changing the combination of the size of the space portion and the width and
length of the gap, it is possible to suppress standing waves generated inside the acoustic tube
and make it acoustically flat, and furthermore, the conventional speaker Compared with the
method of suppressing the standing wave generated inside the acoustic pipe by using the sound
absorbing material as used in the apparatus, there is no decrease in sound pressure and the cost
is low because no sound absorbing material is used. Can.
[0015]
Embodiment 1 An embodiment of the present invention will be described below with reference to
FIGS. 1 and 2.
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The same reference numerals as in FIGS. 1 and 2 indicate the same parts.
[0016]
FIG. 1 is a plan cross-sectional view of a speaker apparatus mainly including an acoustic pipe
portion in a first embodiment of the present invention.
In FIG. 1, reference numeral 19 denotes a full band reproduction speaker unit, and a front
surface of the full band reproduction speaker unit 19 has an acoustic tube opening 14 having a
long and narrow rectangular shape in consideration of incorporation into a device. An acoustic
tube 13 for guiding a sound wave is sealingly connected via an edged rib 21.
[0017]
The inside of the acoustic tube 13 constitutes the sound path 15 of the sound wave radiated
from the full band reproduction speaker unit 19 and the opening of the acoustic tube 13 from
the front side of the speaker unit 19 so that correction of acoustic characteristics is possible. A
first reflector 16 is disposed which has a length which faces 14 and which is connected to the
side wall 12.
In addition, the end portion is located between the first reflection plate 16 and the side wall of
the acoustic tube 13 and closer to the opening 14 side of the acoustic tube 13 than the start end
(speaker unit 19 side) of the first reflection plate 16 A second reflection plate 17 disposed in a
pair from the front of the speaker unit 19 is disposed.
In addition, the gap 22 between the first reflection plate 16 and the second reflection plate 17 is
a space portion 23 (a space portion between the first reflection plate 16 and the side wall of the
second reflection plate 17 and the acoustic tube 13) 23. It has a distance to communicate.
[0018]
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The operation of the loudspeaker apparatus configured as described above will be described.
First, when an input signal is applied to the full band reproduction speaker unit 19, the
diaphragm 20 of the speaker vibrates, and a sound wave is guided to the opening 14 of the
sound pipe 13 through the sound path 15 inside the sound pipe 13. However, at that time, the
length of the first reflecting plate 16 emphasizes the sound pressure in a specific frequency
band. And, the suppression of the standing wave generated due to the length of the acoustic tube
13 is absorbed by the resonance phenomenon caused by the combination of the space portion
23 and the gap 22 having a distance so as to lead to the space portion 23. By these, it is possible
to control the mid-high range reproduction band comprehensively, and it is possible to improve
the mid-high range sound pressure which is an important frequency band constituting human
voice.
[0019]
The sound pressure frequency characteristic 25 of the speaker device according to the present
embodiment is shown by a broken line in comparison with FIG. 3 together with the solid line of
the sound pressure frequency characteristic 24 of the conventional speaker device.
[0020]
As can be seen from FIG. 3 as well, by arranging the space 22 and the gap 22 having a distance
so as to communicate with the space 23 in combination, the standing wave inside the acoustic
tube 13 can be suppressed and at the same time the diagram. As shown in 25 of 3, it has become
possible to reduce the peak dip and to have a high sound pressure characteristic in the middle
and high frequencies.
That is, the improvement of the intelligibility of the voice, the flattening of the reproduced sound
pressure frequency characteristic, and the reduction of the sound absorbing material, which
could not be realized conventionally, can be achieved, and the excellent acoustic characteristics
can be realized.
[0021]
Further, by incorporating the speaker device of the present invention into a television receiver, it
is possible to easily realize downsizing of the television receiver and slimming of the design, and
to provide a high-performance, high-quality television receiver. Is possible.
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[0022]
Second Embodiment A second embodiment of the present invention will be described below with
reference to the drawings.
The same reference numerals as in FIGS. 1 and 2 denote the same parts.
[0023]
FIG. 2 is a plan cross-sectional view of a speaker apparatus mainly composed of an acoustic pipe
portion according to a second embodiment of the present invention. In FIG. 2, the asymmetrical
first reflecting plate A29 is installed so that the starting end comes before the end of the
asymmetrical second reflecting plate C31 (speaker unit 19 side), and the asymmetrical first
reflecting plate B30 is asymmetrical It is installed so that the start end comes before the end of
the second reflection plate D32, and 29 and 30 are asymmetrical, and 31 and 32 are also
asymmetrical.
[0024]
In the case of the second embodiment having the above-mentioned configuration, a sound wave
is guided to the acoustic pipe opening 14 through the sound path 15 inside the acoustic pipe 13,
and at that time, the asymmetric first reflector A29 and the asymmetry The sound pressure in
different frequency bands is emphasized by the length of each of the first reflecting plate B30,
and the suppression of the standing wave generated by the length of the acoustic tube is a
distance so as to lead to the space 23 and the space 23 By absorbing the resonance phenomenon
caused by the combination with the gap 22 having the above, and making it as left-right
asymmetry and independent, the control of the sound pressure frequency characteristic can be
further finely made more easily, and the first overall The position of the peak dip of the
reproduction sound pressure frequency characteristic can be adjusted more easily than in the
example, and an excellent acoustic characteristic as a speaker device for a television receiver can
be realized.
[0025]
It is needless to say that the same effect can be obtained even in the case where a rear surface
cabinet, a bass reflex port and the like are provided in the speaker device configured by the
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structure of the acoustic tube 13 of the present invention.
[0026]
As described above, the speaker device according to the present invention can improve the sound
pressure of 500 to 5 kHz, which is an important frequency band constituting human voice, and
can use tubes to make use of resonance. Because it is also possible to completely absorb standing
waves that come from the length of the sound, it is possible to obtain a flat reproduction sound
pressure frequency characteristic with few peak dips, and improve the intelligibility of voice that
can not be realized with conventional products. It is possible to realize an excellent acoustic
characteristic, and also to realize a speaker device which is superior also in cost without
deteriorating the sound pressure in the middle and high frequencies since no sound absorbing
material is used.
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