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JP2011009990

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DESCRIPTION JP2011009990
To provide a unidirectional speaker device in which a reflected sound from a wall or the like does
not reach a listening position in a listening room by a simpler method. SOLUTION: An open type
speaker 10 having bidirectionality and an enclosed type speaker 20 having no directivity are
provided, and the closed type speaker 20 is released on the back side of the open type speaker
10. The closed type speaker driving means 30 is disposed with the sound surface directed to the
back side of the open type speaker 10 with their sound emission axes substantially the same, and
driving the closed type speaker 20 in the same phase as the open type speaker 10 . [Selected
figure] Figure 1
Speaker device
[0001]
The present invention relates to a unidirectional speaker apparatus in which a reflected sound
from a wall or the like does not reach a listening position in a listening room.
[0002]
When the speaker is driven, sound waves are respectively emitted from the front side and the
back side of the diaphragm.
If the sound wave emitted to the front side is in the normal phase, the sound wave emitted from
the back side has the opposite phase, so that in the listening room etc., the reflected sound from
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1
the wall surface etc. arrives at the listening position.
[0003]
Since this reflected sound is not included in the original sound source, it is desirable that there is
no reflected sound. Not only that, by the sound wave being emitted to the back side of the
speaker, an object present in the room may resonate to further emit a sound wave.
[0004]
Therefore, in the invention described in Patent Document 1 as an example, the front and back
sides of the speaker are acoustically separated by the baffle plate, but since the baffle plate is
physically limited, It can not be said that it is perfect.
[0005]
On the other hand, there are known a phase inversion method, a drone cone method, etc., in
which a speaker is housed in an enclosure and the sound wave from the back of the speaker is
phase inverted in the enclosure to emit sound from the front of the enclosure. According to the
above, the problem of the reflected sound described above hardly occurs.
[0006]
However, since it is difficult to obtain the resonant frequency by calculation, for example, the
volume of the air chamber in the enclosure, the mass of the drone cone, etc. are variably set on a
trial and error basis to set the optimal resonant frequency. The point is considered a drawback.
[0007]
JP 10-108285 A
[0008]
Therefore, an object of the present invention is to provide a unidirectional speaker device in
which the reflected sound from a wall or the like does not reach the listening position in the
listening room by a simpler method.
[0009]
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2
In order to solve the above problems, the present invention includes an open speaker having
directivity of two directions and an enclosed speaker having no directivity, and the abovementioned hermetic seal is provided on the back side of the open speaker. Type speaker is
disposed with its sound emitting surface facing the back side of the open type speaker with
substantially the same sound emission axis, and a closed type speaker driving the abovementioned closed type speaker in the same phase as the open type speaker It is characterized in
that a drive means is provided.
[0010]
According to a preferred aspect of the present invention, the closed speaker driving unit is a
closed microphone so that the nondirectional microphone disposed on the back side of the closed
speaker and the sound output of the microphone become substantially zero. And a feedback
circuit for driving the speaker.
[0011]
Further, in the present invention, the sealed speaker driving unit may be configured to include a
frequency response adjusting circuit that adjusts a frequency response of an audio signal output
from a driving sound source of the open speaker.
[0012]
According to the present invention, since the sound wave radiated from the 180 degree (rear
side) of the open type speaker is opposite in phase to the sound wave radiated from 0 degree
(the front side), the closed type speaker is an open type speaker Since the sound pressure in the
direction of 180 degrees is subtracted by driving in the same phase, a unidirectional speaker
device in which the reflected sound from the wall or the like does not reach the listening position
in the listening room is obtained. be able to.
[0013]
FIG. 1 is a schematic cross-sectional view showing a speaker device according to a first
embodiment of the present invention.
The typical sectional view showing the speaker apparatus concerning a 2nd embodiment of the
present invention.
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[0014]
Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
However, the present invention is not limited to this.
[0015]
First, the speaker device 1A according to the first embodiment of the present invention will be
described with reference to FIG. 1. The speaker device 1A includes an open speaker 10 and a
closed speaker 20 respectively.
[0016]
The directivity of the open speaker 10 is bidirectional, and the sound wave emitted from 0
degree (front side, left side in FIG. 1) of the speaker unit 11 and 180 degrees (rear side, right side
in FIG. 1) The sound waves are opposite in phase.
[0017]
That is, in the open speaker 10, if the sound wave emitted from 0 degree is in the positive phase,
the sound wave emitted from 180 degree is in the opposite phase.
On the other hand, the directivity of the enclosed speaker 20 is nondirectional.
[0018]
In a listening room (not shown), the open speaker 10 is disposed on the listening side (left side in
FIG. 1), and the closed speaker 20 is disposed on the back side (right side in FIG. 1) of the open
speaker 10.
[0019]
It is preferable that the speaker unit 11 of the open-type speaker 10 and the speaker unit 21 of
the closed-type speaker 20 be disposed such that their sound emission axes are substantially the
same.
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Moreover, it is preferable that each speaker unit 11 and 21 is the same speaker unit.
[0020]
The speaker unit 11 of the open speaker 10 is driven via the power amplifier 12 by an audio
signal output from a sound source S such as a CD deck.
[0021]
On the other hand, by driving the closed type speaker 20 in phase with the open type speaker 10
by the closed type speaker driving means 30, the sound pressure radiated from the 180 degree
direction of the open type speaker 10 is subtracted (cancelled And sound waves from the speaker
device 1A to the rear can be eliminated.
[0022]
Since the directional frequency response is different between the open speaker 10 and the closed
speaker 20, it is necessary to maintain single directivity in a wide frequency band.
[0023]
Therefore, the closed speaker driving means 30 in the first embodiment includes a
nondirectional microphone 31 disposed behind the closed speaker 20, an inverting amplifier 32
for inverting and amplifying the microphone output, and a speaker driving device. The speaker
unit 21 of the closed-type speaker 20 is driven so as to be a feedback circuit including the power
amplifier 33 and to make the microphone output almost zero.
The microphone 31 may be disposed in the open speaker 10.
[0024]
Next, a speaker device 1B according to a second embodiment of FIG. 2 will be described.
In the speaker device 1B according to the second embodiment, the closed speaker driving means
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30 is provided with a frequency response adjusting circuit 34 for adjusting the frequency
response of the audio signal outputted from the sound source S such as a CD deck to a
predetermined level.
The other configuration may be the same as that of the first embodiment, and an equalizer is
preferably adopted for the frequency response adjustment circuit 34.
[0025]
As described above, according to the present invention, the simple method of combining the
open speaker 10 and the closed speaker 20 prevents the reflected sound from the wall or the like
from reaching the listening position in the listening room. Speaker device can be obtained.
In each of the above embodiments, a capacitor type or the like may be used as the open type
speaker 10 in addition to the dynamic type.
[0026]
1A, 1B Speaker device 10 Open-type speaker 11 Speaker unit 20 Sealed speaker 21 Speaker unit
30 Sealed speaker drive means 31 Microphone 32 Inverting amplifier 33 Power amplifier 34
Frequency response adjustment circuit
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