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DESCRIPTION JPH03272299

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DESCRIPTION JPH03272299
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
silencer, and in particular, of propagation sound waves from a noise source such as an air
conditioner installed in a room surrounded by a sound insulation wall, radiation from an opening
such as a ventilating hole in the room. The present invention relates to a muffling apparatus for
muffling propagating sound waves. In the prior art, as shown in FIG. 5, a sound absorbing pipe
16.18 is attached to the outside of the sound insulation wall 10 at each of the ventilation
openings 12.14 formed on both sides of the sound insulation wall 10, as shown in FIG. Be A
sound absorbing material 20.20 made of a porous material is internally stuck on the inner
peripheral surface of the front sound absorbing tube 16.18, and the outlet opening 22.24 is
formed in a curved shape downward in the drawing. As a result, of the propagation sound waves
radiated from the air conditioning unit W 28 in the room 26, the propagation sound waves
radiated from the ventilation port 12.14 are absorbed by the sound absorbing material 20.20
and muffled. Further, the sound absorbing effect can be further improved by lengthening the
sound absorbing pipe 16. 18 or devising the shape. However, since the sound absorbing member
20 itself is inferior to the low frequency sound absorbing ability, the sound deadening device by
the above-mentioned pipe structure has a disadvantage that it can not cope with mechanical
equipment which radiates a low frequency propagation sound wave. Further, when the sound
absorbing pipe 16.18 is elongated, the silencer becomes large, and when the shape of the sound
absorbing pipe 16.18 is complicated, pressure loss increases and the ventilation effect is
deteriorated. On the other hand, as another muffling device for muffling the above-mentioned
propagation sound waves, sound waves of the same sound pressure and the opposite phase are
emitted to the propagation sound waves propagating from the noise source and the muffling
effect is forced by sound wave interference. There is something to cause. With the rapid
development of electronic devices, signal processing techniques, and the like, research results
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from various viewpoints have been announced one after another in recent years. The applicant
has already disclosed a system configuration for practical use in the specification of Japanese
Patent Application No. 61-7115, etc. with regard to this noise reduction device. The noise
reduction device shown in FIG. 6 has been proposed as an application of this system
configuration to the noise reduction device of the present invention (Japanese Patent Application
No. Hei 1-177312). According to FIG. 6, the sensor microphones 30.30 and the error
microphones 32.32 for detecting the propagation sound wave from the air conditioner 28 are
added to the respective ventilation openings 16.18 and additional sound sources (hereinafter
referred to as speakers) 34.34. It is installed on the upstream side and the downstream side of
the radiation direction of the above-mentioned propagation sound wave on the basis of,
respectively. The sensor microphone 30.30 is installed on the side of the room 26, and the error
microphone 32.32 is installed on the outlet side of the ventilation port 16.18, that is, the external
space.
Furthermore, the speakers 34, 34,... Are attached to the outer wall of the sound insulating wall
10 on the outlet side of the ventilation port 16.18. Further, the sensor microphone 30.30, the
error microphone 32.34 and the speakers 34.34... Are connected to the control device 36.36. As
shown in FIG. 7, the distribution device 36 mainly comprises an amplifier 38.38.38, an A / D
converter 40.42, a D / A converter 44, an adaptive filter 46, and a controller 48. Based on the
input signals from the sensor microphone 30 and the error microphone 32, a signal for
controlling the speaker 34 is output. That is, when the propagation sound wave radiated from the
air conditioner 28 is detected by the sensor microphone 30 and the error microphone 32, the
output signal of the sensor microphone 30 is transmitted through the amplifier 38 and the A / D
converter 40 to the adaptive filter 46 and controller The output signal of the error microphone
32 is input to the controller unit 48 via the amplifier 38 and the A / D conversion unit 42. In the
controller unit 48, in consideration of propagation characteristics and the like of the propagation
sound wave from the air conditioner 28, a propagation function indicating these characteristics is
determined, and based on these propagation functions, the muffling effect, ie, the propagation
sound wave from the air conditioning device Control for determining the transfer function to be
applied to the adaptive filter 46 so as to minimize the output signal of the error microphone 32
for detecting the acoustic interference state with the sound wave emitted from the speaker 34,
and for controlling this transfer function The parameters are set in the adaptive filter 46. The
controller unit 48 corrects the control parameter as needed according to the change of the
propagation characteristic and the characteristic change of the control system. As a result, the
propagation sound wave from the air conditioner 28 detected by the sensor microphone 30 and
the error microphone 32 is converted into an electronic signal, and is input to the adaptive filter
46 through the amplifier 38 and the A / D converter 40. The input signal (X) is converted by the
adaptive filter 46 into a digital signal (Y) having predetermined amplitude characteristics and
phase characteristics based on the transfer function supplied from the controller unit 48. The
digital signal (Y) is D / A converted by the D / A conversion unit 44 and applied as a drive signal
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for the speaker 34 to a drive coil (not shown) of the tes healer 34. As a result, the speaker 34
emits a sound wave for canceling the propagation sound wave emitted from the air conditioner
28. As a result, at the mounting position of the error microphone 32, the propagation sound
wave from the air conditioner can be silenced by the interference of the sound wave.
In the figure, E is a signal indicating a residual propagation sound wave. [Problem to be Solved by
the Invention] However, in the muffling apparatus shown in FIG. 6, since the error microphone
32 and the speaker 34 are installed on the outside of the sound insulating wall 10, depending on
the condition of the sound field in the external space The sound pressure of the radiation may
increase. When the sound pressure increases, the amount of the increase is given as noise to the
external space, which causes a problem that the propagating sound waves emitted from the
opening 12.14 can not be completely muffled. The present invention has been made in view of
such circumstances, and it is an object of the present invention to provide a silencer capable of
completely silencing transmitted sound waves radiated from the opening of the sound insulation
wall without adversely affecting the external space. Do. [Means for Solving the Problems] In the
present invention, in order to achieve the above object, the noise barrier of the sound waves
transmitted from the noise source (28) installed in the room (26) surrounded by the noise barrier
(10) In a muffling apparatus for muffling a propagation sound wave radiated from an opening
(12, 14) formed in (10), a propagation sound wave propagating from the noise source (28) to the
opening (12, 14) is Noise detection means (30) for detecting, and additional sound generation
means (34) provided in the room (26) for generating sound waves of the same sound pressure
and in opposite phase to the propagation sound waves detected by the noise detection means
(30) ), And the propagation sound wave emitted from the noise source (28) and the addition
sound emitted from the pre-notification sound generation hand & (34) attached to the opening
position of the opening (12, 14) Error microphone which detects sound wave after interference
(32) From become, characterized in that so as to mute in the opening (12, 14) located
propagation wave by wave interference from the noise source (28). [Operation] According to the
present invention, the additional sound generation means (34) is installed in the room (26) and
the error microphone (32) is provided at the opening position of the opening (12, 14). Without
being influenced by the field, the transmitted sound wave from the noise source (28) can be
muffled at the opening (12, 14) position of the sound insulation wall (10) by sound wave
interference. The preferred embodiments of the noise suppressor according to the present
invention will be described in detail with reference to the attached drawings. FIG. 1 is a crosssectional view showing a first embodiment of the noise suppressor according to the present
invention, and the same or similar members in the conventional example shown in FIG. explain.
In FIG. 1, a pair of sensor microphones 30.30, an error microphone 32.32 and a speaker 34.34
are installed near the ventilation openings 12.14 opened on both sides of the sound insulation
wall 10.
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Further, the sensor microphone 30, the error microphone 32, and the speaker 34 are connected
to the control device 36 mounted in the room 26, respectively. Here, the operation of the control
device 36 shown in FIG. 7 is omitted, and the operations of the sensor microphone 30, the error
microphone 32 and the speaker 36 are also omitted. An air conditioner 28 is installed in the
room 26, and the air conditioned by the air conditioner 28 is sent to the air conditioned space
through an air duct (not shown) communicated with the ventilation port 12. 14 of the sound
insulation wall 10. A sensor microphone 301.30 is attached to the room 26 side near the
ventilation opening 12.14, and an error microphone 32.32 is attached to the central part of the
ventilation opening 12.14. The sound receiving surfaces of the sensor microphone 30 and the
error microphone 32 are mounted at the same height in the room 26. Further, the speaker 34 is
provided at a position where the sound wave is emitted in a direction orthogonal to a straight
line connecting those sound receiving surfaces. The speaker 34 is fixedly installed on the inner
wall surface of the sound insulating wall 10, and the sound wave emitting surface 34 a thereof is
attached in the direction of the ceiling of the sound insulating wall 10. Next, the operation of the
first embodiment of the noise suppressor configured as described above will be described. As
described above, since the error microphone 32.32 is attached to the central portion of the
ventilation opening 12.14, the error microphone 32.32 is not affected by the condition of the
sound field in the external space, and the propagation sound wave emitted from the air
conditioner 28 Detect only Therefore, since the sound wave emitted from the speaker 34 is
controlled based on the respective output signals from the error microphone 32 and the sensor
microphone 30 which detect only the propagation sound wave, the position of the error
microphone 32. 32, ie ventilation The sound pressure for muting the propagating sound wave is
determined at the center of the mouth 12.14. As a result, it is possible to completely mute the
propagating sound wave emitted from the air conditioner 28 at the position of the ventilation
opening 12.14 by the sound wave interference without giving noise to the external space.
Further, since the error microphone 32 and the speaker 34 are provided on the side of the room
26 of the sound insulation wall 10, the noise reduction device can be miniaturized as compared
with the conventional noise reduction device. FIG. 2 shows a second embodiment of the noise
suppressor according to the present invention. In FIG. 2, the sensor microphones 30.30 are
provided on the upper side of the air conditioner 28 on both sides. Further, the error microphone
32 is attached to the same position as the error microphone shown in FIG. 1, that is, at the
central portion of the vent 12.14. Furthermore, the sound receiving surfaces of the sensor
microphone 30 and the error microphone 32 are also mounted at the same height in the room
26, as in the first embodiment shown in FIG.
The speaker 34 is installed in the vicinity of the ceiling of the sound insulation wall 10, and its
sound emitting surface 34a is inclined toward a central portion of a straight line connecting the
sound receiving surfaces of the sensor microphone 30 and the error microphone 32. Therefore,
according to the second embodiment, as in the first embodiment, the error microphone 32 is not
affected by the condition of the sound field table in the external space, and the sound wave
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emitted from the speaker 34 is from the air conditioner 28. As determined by the output signal
from the sensor microphone 30 and the error microphone 32 which detect only the propagation
sound wave, the transmission sound wave can be completely muffled at the position of the
ventilation port 12.14. In the present embodiment, one speaker 34 is provided for each
ventilation port 12.14, but the number is not limited to this. As shown in FIG. 3, two units are
provided on the room 26 side of each ventilation port 212.14, and their sound wave emitting
surfaces 34a and 34a are mounted opposite to each other, and the sound receiving surfaces of
the sensor microphone 30 and the error microphone 32 are also provided. By setting the
position at the control position with respect to the straight line connecting the two, it is possible
to obtain the same effect as the silencer shown in the first embodiment and the second
embodiment. Further, as shown in FIG. 4, the acceleration pickup 50 is bonded to the air
conditioner 28 instead of the sensor microphone 30, and the vibration generated from the air
conditioner 28 is converted into an electric signal and manually operated on the controller 36. As
a result, it is possible to prevent howling that occurs between the sensor microphone 30 and the
speaker 34, so that a stable muffling effect can be obtained. As described above, according to the
noise reduction device of the present invention, the additional sound generation means is
installed in the room surrounded by the sound insulation wall, and the error microphone is
mounted at the opening position of the opening. It is possible to completely mute the sound wave
propagating from the noise source provided in the room at the opening of the sound insulation
wall by the sound wave interference without being affected by the noise.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view showing a first embodiment of the noise suppressor according to the
present invention, FIG. 2 is a sectional view showing a second embodiment of the noise
suppressor according to the present invention, and FIG. 3 is a silencer according to the present
invention FIG. 4 is a cross-sectional view showing a fourth embodiment of the silencer according
to the present invention, and FIG. 5 is a cross-sectional view showing a first embodiment of the
conventional silencer, FIG. FIG. 7 is a cross-sectional view showing a second embodiment of the
conventional noise reduction device, and FIG. 7 is an explanatory view showing a control system
of the control device.
10: sound insulation wall, 12.14 ventilation port, 28: air conditioner, 30: sensor microphone, 32:
error microphone, 34: speaker, 50: acceleration pickup.
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