JPH05108083

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DESCRIPTION JPH05108083
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electronic muffling apparatus for local muffling, and in particular, in an office space having a
noise area and a work area formed on the same floor, muffling noise transmitted from the noise
area in the work area. The present invention relates to an electronic muffling apparatus for local
muffling.
[0002]
2. Description of the Related Art In an office space where a noise area and a work area are
formed on the same floor surface, partition 1 as shown in FIG. 4 as a measure to prevent noise
generated in the noise area from propagating to the work area. There is a method of dividing the
noise area 2 and the work area 3 by the However, this method is disadvantageous in that the
partition 3 itself has little sound absorption effect and noise is propagated to the work area 2 by
the diffraction sound 4 from the upper end of the partition 3. Furthermore, by providing the
partition 3, there is a disadvantage that the office space can not be used effectively.
[0003]
On the other hand, as a muffling apparatus for muffling the noise generated in the noise area 2,
on the other hand, additional sounds of the same sound pressure and in opposite phase to the
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noise are emitted, and the muffling effect is forcedly generated by their sound wave interference.
There is an electronic muffling device that With the rapid development of electronic devices,
signal processing technology, and the like, the electronic silencer of this type has recently been
successively published as research results from various viewpoints.
[0004]
The applicant of the present invention has already disclosed a system configuration for practical
use in the specification of Japanese Patent Application No. 61-7115 etc. for this electronic
muffling apparatus. As a system in which such a system configuration is applied to the present
case, an electronic muffling apparatus for local muffling as shown in FIG. 5 has been proposed.
According to FIG. 5, noise generated in the noise area 2 is detected by the noise information
detection means (hereinafter referred to as sensor microphone) 5 and added to cancel the noise
from the electromechanical conversion means (hereinafter referred to as speaker) 6 Sound is
emitted, and noise is silenced at the position of the mechanical-electrical conversion means
(hereinafter referred to as an error microphone) 7, that is, in the vicinity 8 of the operator in the
work area 3.
[0005]
The sensor microphone 5, the speaker 6, and the error microphone 7 are connected to the
controller 9, and based on the signals from the sensor microphone 5 and the error microphone 7,
the controller 9 is in reverse phase and has the same sound pressure as the noise. A drive signal
is generated to cause the speaker 6 to emit an additional sound.
[0006]
However, although the conventional electronic muffling apparatus for local muffling can muffle
noise in the vicinity 8 of the operator in the working area 3, the other areas except the vicinity 8
of the operator In the work area 3, the noise level is increased due to the additional sound
radiated from the speaker 6, which is disadvantageous in that the work area is adversely affected.
[0007]
The present invention has been made in view of such circumstances, and it is an object of the
present invention to provide an electronic muffling apparatus for local muffling capable of
muffling noise without adversely affecting the work area.
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[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is
provided in an office space in which a noise area and a work area are formed on the same floor,
and the noise transmitted from the noise area is used as the work area. The electronic muffling
device for local muffling that muffles, and is mounted in the vicinity of the operator in the work
area, noise information detection means for detecting the noise, electromechanical conversion
means for emitting additional sound for canceling noise, A mechanical-electrical conversion
means for detecting interference noise between the noise and the additional sound radiated from
the electromechanical conversion means, and a reverse of the noise based on signals from the
noise information detection means and the mechanical-electrical conversion means A control
means for producing a drive signal for emitting from the electromechanical conversion means an
additional sound with the same sound pressure and the same sound pressure, in the electronic
muffling apparatus for local muffling comprising the electromechanical conversion means In
addition to tropism, the electromechanical conversion means is swingably installed, and an
infrared generator installed in the vicinity of the worker, and the electromechanical conversion
means attached to the infrared radiation from the infrared generator. A light receiving unit for
receiving light and a driving unit for swinging and fixing the electromechanical conversion unit
at a position where the infrared light from the infrared generator is vertically received by the
light receiving unit are attached, and from the electromechanical conversion unit It is
characterized in that the additional sound is emitted toward the worker.
[0009]
According to the present invention, the electromechanical transducer has directivity, so that the
additional sound emitted from the electromechanical transducer is not diffused to the working
area, and the infrared ray from the infrared generator is perpendicular to the light receiving
portion. The electromechanical transducer is oscillated by the drive means at the position where
light is received, and is fixed at that position.
Thereby, the additional sound from the mechanical / electrical conversion means is radiated only
to the vicinity of the worker in the work area, so the propagation from the noise area without
adversely affecting the work area excluding the vicinity of the worker Noise can be silenced.
[0010]
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the
electronic silencer for local silencer according to the present invention will be described in detail
with reference to the attached drawings.
FIG. 1 shows a cross-sectional view of an office space 10 to which an electronic silencer for local
silencer according to the present invention is attached.
In the office space 10, a reception area 12 is formed on the left side in the drawing and a work
area 14 is formed on the right side in the drawing, and noise generated in the reception area 12
is propagated to the work area 14 via the office space 10.
[0011]
On the other hand, the sensor microphone 16 is mounted on the reception table 18 installed in
the reception area 12.
The sensor microphone 16 is connected to the controller 22 via a cable 20. The controller 22 is
provided in a ceiling room of the office space 10, and a speaker 26 having directivity described
later is connected to the controller 22 through a cable 24.
[0012]
An error microphone 30 is attached to the work desk 28 installed in the work area 14. The error
microphone 30 is installed at substantially the same height as the height of the ear of the worker
32 who works at the work desk 28, and is connected to the transmitting device 36 via the cable
34. As shown in FIG. 2, the transmitting device 36 uses an A / D circuit 38 to generate a signal
indicating an interference sound between the noise and the additional sound emitted from the
speaker 26, the signal indicating the sound detected by the error microphone 30. The digital
signal is converted by D / D conversion and modulated by the modulation circuit 40, and
transmitted by the transmitter 42 to the receiver 44 by radio. As shown in FIG. 1, the receiving
device 44 is installed near the controller 22, demodulates the information wirelessly transmitted
from the transmitter 42 shown in FIG. 2 by the demodulation circuit 48, and outputs the
information to the controller 22.
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[0013]
The controller 22 generates a drive signal for causing the speaker 26 to emit an additional sound
having the same sound pressure and the opposite phase as the noise based on the signals from
the sensor microphone 16 and the receiving device 44. Further, as shown in FIG. 3, the speaker
26 is swingably attached to the ceiling surface 56 via a hinge member 54 having an upper
portion formed of a lower arm 50 and an upper arm 52. A shaft 58 is fixed to the lower arm, and
a gear 60 is fixed to an end of the shaft 58. The rotary gear 64 of the drive motor 62 is engaged
with the gear 60, and the gear 60 moves along the rotary gear 64 by driving the drive motor 62
to reverse the rotary gear 64 forward. Can be shaken.
[0014]
In addition, an infrared light receiving unit 66 configured by an infrared light receiving element
is attached to a substantially central position of the additional sound emission surface 26 a of the
speaker 26. The infrared light receiving unit 66 is connected to a drive control device (not
shown) of the drive motor 62 via a cable 68. In addition, an infrared signal generator 70 is
mounted on the work desk 28. Next, the operation of the local muffling electronic muffling
apparatus configured as described above will be described.
[0015]
First, the speaker 26 is oscillated by the drive motor 66 driven and controlled by the drive
control device at a position where the infrared light generated from the infrared signal generator
70 vertically hits the light receiving surface of the infrared light receiving unit 66 and fixed at
that position. Be done. Then, an additional sound is emitted from the speaker 26 toward the
infrared signal generator 70, that is, toward the worker 32. Since the additional sound emitted
from the speaker 26 has directivity in the speaker 26, it is not diffused throughout the work area
14 and is emitted only to the vicinity 72 of the worker 32 to which the error microphone 30 is
attached. Become.
[0016]
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Therefore, according to the present embodiment, compared with the conventional local muffling
electronic muffling apparatus in which the additional sound from the speaker is diffused to the
work area, the work area 14 other than the vicinity 72 of the worker 32 is adversely affected.
Instead, noise transmitted from the reception area 12 can be silenced in the vicinity 72 of the
worker 32. Further, in the present embodiment, since the signal from the error microphone 30 is
transmitted to the controller 22 by wireless transmission, even if the infrared signal generator
70, the error microphone 30, and the transmitter 36 are installed in different places, Noise can
be silenced in the vicinity 72 of the worker 32 working at the location.
[0017]
In the present embodiment, the swing mechanism of the speaker 26 has been described with
respect to one direction, but the present invention is not limited to this, and it is desirable to
swing in multiple directions.
[0018]
As described above, according to the electronic muffling apparatus for local muffling according
to the present invention, the electromechanical conversion means has directivity and the
additional sound radiated from the electromechanical conversion means is not diffused to the
work area Also, the electromechanical conversion means is oscillated by the drive means at a
position where the light receiving unit vertically receives the infrared light from the infrared light
generator, and is fixed at that position, and the additional sound from the electromechanical
conversion means is Since the radiation is made only to the vicinity of the worker in the work
area, noise transmitted from the noise area can be silenced without adversely affecting the other
work area except the vicinity of the worker.
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