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JP2005184426

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DESCRIPTION JP2005184426
The present invention provides a sound source direction detection device capable of detecting,
for example, the direction of abnormal sound of piping equipment with a simple configuration. A
sound source direction detection device (10) is provided with a first microphone (11) for
detecting a sound from a first direction first, a first microphone (11) at a predetermined interval,
and a second The second microphone 12 for detecting the sound from the first direction first, the
flip flop circuit 13 to which the output signals A and B of the first and second microphones 11
and 12 are input, and the flip flop circuit 13 And a sound source direction detection unit 14 for
detecting a sound source direction based on the first and second output signals Q and Q.
[Selected figure] Figure 1
Sound source direction detection apparatus and method
[0001]
The present invention relates to a sound source direction detection apparatus and method, and
more particularly to a sound source direction detection apparatus and method for detecting a
sound source direction after arrival of sound to a plurality of microphones.
[0002]
Nuclear power plant equipment, which plays a leading role in electric power supply, consists of a
complex combination of various types of piping, and these are mainly maintained by equipment
inspection through daily on-site patrol.
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However, the fact is that on-site patrol is carried out regularly and focusing on the main parts of
the facilities, and it is very difficult to inspect all the piping facilities and prevent accidents in
advance. . For this reason, piping equipment accidents may occur during operation of a nuclear
power plant. If a piping problem occurs at a nuclear power plant, the reactor is shut down
manually, resulting in a decrease in the operating rate of the nuclear power plant.
[0003]
Human beings have five senses (sensors) of sight, hearing, touch, smell and taste (sensors), but in
order to catch early signs of piping equipment abnormalities more quickly and properly, among
these sensors, the more appropriate It is important to choose one. In many cases, the condition of
the piping abnormality which has become apparent appeals to the eye such as rupture, breakage,
or bending of the pipe, but the process leading to the trouble is within the pipe which is hardly
visible from the outside. It's happening. For this reason, it can be said that detection of prior
signs of piping abnormalities is difficult by methods based on vision, smell and taste. Therefore, it
is a method in which abnormality detection by hearing (sound) or touch (heat, temperature)
remains.
[0004]
In most cases, liquid or gas flows in the piping system. If any abnormality occurs in this state, the
flow is considered to be disturbed. At this time, generally, vibration noise is generated due to the
disturbance of the flow, and it is considered that when this state continues for a long time, it
generates heat and appears as temperature change. Here, while the sound propagates in air at a
constant velocity of about 340 m / s (15 ° C.) (about 5950 m / s in solid iron), the heat
propagation velocity is generally greater than that of sound. It is considered that it is quite slow,
and the heat propagation speed is largely dependent on the volume of the propagation medium
and the like. From these things, it can be said that a device (sensor) that senses an abnormal
sound is appropriate to catch prior signs of piping equipment abnormalities, but to catch and
respond to prior signs of piping equipment abnormalities, It is necessary to detect not only the
magnitude of the abnormal sound but also where in the pipe the abnormal sound is generated.
[0005]
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As a sound source direction detection device for detecting a sound generation direction (sound
source direction), those disclosed in the following patent documents have been proposed. JP-A-894731 JP-A-9-222352 JP-A-10-332807 JP-A-2001-25082 JP-A-2002-27455
[0006]
Patent Document 1 (Japanese Patent Application Laid-Open No. 8-94731) discloses that at least
two microphones having directivity arranged close to each other are used to detect the rise of the
sound input to each microphone before the sound source is detected. A sound source direction
detection device is disclosed that measures the magnitude of the sound input to each microphone
while the reflected sound reaches the microphone, and determines the direction of the sound
source based on each magnitude of the measured sound. However, such a sound source direction
detection device detects the sound source direction by comparing the magnitudes of the reflected
sound, and it is necessary to detect the reflected sound and also to detect the magnitude.
[0007]
Patent Document 2 (Japanese Patent Application Laid-Open No. 9-222352) drives the acoustic
sensor so that the acoustic sensor is directed to one of the two sound source direction candidates
detected in the first measurement, and Perform the second measurement to detect two sound
source directions, compare the first sound source direction candidate and the second sound
source direction candidate, and determine the sound source direction as the direction in which
the difference is the smallest A detection device is disclosed. However, such a sound source
direction detection device needs to detect sound source direction candidates twice by changing
the direction of the acoustic sensor to determine the sound source direction.
[0008]
Patent Document 3 (Japanese Patent Application Laid-Open No. 10-332807) sets the direction of
the sound source based on a plurality of microphones arranged in a three-dimensional manner
and a permutation of microphones corresponding to the arrival order of acoustic signals detected
by each microphone. Disclosed is a sound source direction detection device including a direction
determination unit to be determined. However, such a sound source direction detection
apparatus arranges a plurality of microphones in a three-dimensional manner to determine the
sound source direction.
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[0009]
Patent Document 4 (Japanese Patent Application Laid-Open No. 2001-25082) discloses the
power of the sound reception signal according to a single directivity pattern in the negative
direction (front direction) in the X axis and the sound reception signal according to a directivity
pattern in the positive and negative directions in the Y axis A sound source direction detection
device using the above and cross correlation coefficients is disclosed. However, such a sound
source direction detection device needs to calculate the cross-correlation coefficient of the
unidirectional pattern sound reception signal and the bidirectional pattern sound reception
signal.
[0010]
The above-mentioned Patent Document 5 (Japanese Patent Application Laid-Open No. 200227455) has a phase comparison unit for obtaining a phase difference from voice input signals
from a plurality of voice input devices, a sound source direction calculation unit for outputting
sound source direction information from the phase difference. A sound source direction detection
device is disclosed. However, in such a sound source direction detection device, it is necessary to
obtain a phase difference from audio input signals from a plurality of audio input devices.
[0011]
An object of the present invention is to provide a sound source direction detection device capable
of detecting, for example, the direction of abnormal sound of piping equipment with a simple
configuration.
[0012]
According to the sound source direction detection device of the present invention, a plurality of
microphones for detecting each of the sounds from a plurality of directions first and an output
signal of two microphones of different combinations among the plurality of microphones are
obtained. And at least one after-destination detection means for detecting which of the two
microphones the sound has reached first based on the output signals of the two input
microphones and the at least one after-destination detection And sound source direction
detecting means for detecting a sound source direction based on an output signal of the means.
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[0013]
Here, the plurality of microphones include first to n-th microphones for detecting the sound from
the first to n-th directions first, and the at least one after-destination detection means is the
Output signals of two microphones each having a different combination of the first to n-th
microphones are input, and an output signal indicating which of the two input microphones the
sound first arrived at Of the first to n (n-1) / 2 flip flop circuits, and the sound source direction
detecting means comprises an output signal of the first to n (n-1) / 2 flip flop circuits. Based on
the output signal of the m-th microphone of the first to n (n-1) / 2 flip-flop circuits is input to the
(n-1) flip-flop circuits. It may include a sound source direction detection unit which determines
the direction of the m as a sound source direction when the sound to a microphone of said m
indicates that it has reached the previously Te.
n=2であり、かつ、m=1または2であってもよいし、n=3であり、かつ、m=1,2また
は3であってもよいし、n=4であり、かつ、m=1,2,3または4であってもよい。
An amplifier circuit and a waveform shaping circuit may be connected to the output of each of
the microphones. The microphones each have a container (110) of which one surface is a sound
collecting unit (111), a solid-borne sound transmission substance (120) filled in the container
(110), and the inside of the container (110) And a microphone (130) provided covered with the
solid-borne sound transmission material (120).
[0014]
According to the sound source direction detection method of the present invention, sounds from
n directions are first detected using n microphones, and two microphones of different
combinations of the n microphones are detected. When it is detected that the sound has arrived
first, and it is detected that the sound has reached the specific one of the n microphones before
all the other microphones, the n directions are detected. The direction in which the particular
microphone detects the sound first is determined as the sound source direction.
[0015]
The sound source direction detection apparatus and method of the present invention have the
following effects.
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(1) Even when there are sound sources in n directions, the sound source direction can be
detected by providing n (n-1) / 2 flip flop circuits, so the configuration of the sound source
direction detection device is simplified. Can be (2) By providing an amplification circuit and a
waveform shaping circuit on the output side of each microphone, it is possible to detect the
direction of the sound source even if the sound is small or the rising waveform is not steep.
[0016]
For example, the purpose of detecting the direction of abnormal sound of piping equipment with
a simple configuration is two different combinations of plural microphones for detecting sounds
from plural directions first. This is realized by inputting the input signal of each of the
microphones into at least one flip flop circuit and determining the sound source direction based
on the output signal of this flip flop circuit. That is, for example, when the distance between two
microphones is 10 cm, one microphone is disposed on the left side and the other microphone is
disposed on the right side, and sound is generated from the left side on the straight line
connecting these two microphones. Sound first enters one microphone and then enters the other
microphone. The time difference at this time is about 0.3 milliseconds in the case of airborne
sound, and about 20 microseconds in the case of pipelike solid borne sound, and in both cases
there is a slight time difference, It is necessary to detect this slight time difference. As a method
of detecting the time difference of the arrival sound, there is a method of obtaining the time
difference of the arrival sound by comparison with a standard clock pulse or the like to
determine the future, but in this method, the period is a standard of millisecond order or
microsecond order. It is necessary to use clock pulses. Then, when considering the arrival time
difference of the sound from the sound source, it is understood that the arrival time difference is
determined by the distance between the two microphones and is not related to the position of the
sound source. This means that there is no need to detect a specific arrival time difference value
simply by determining the sound source direction. Therefore, it is decided to determine the
arrival time difference, not the analog information as the specific arrival time difference value but
the digital information indicating which sound has arrived first. Such arrival time difference
detection method using digital information can be realized by using a bi-stable multivibrator (flipflop circuit) that responds to short cycle input pulses on the microsecond order.
[0017]
Hereinafter, embodiments of the sound source direction detection apparatus and method of the
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present invention will be described with reference to the drawings. The sound source direction
detection apparatus 10 according to the first embodiment of the present invention is a twoterminal sensor that detects in which of two directions (first and second directions) the sound
source is present. As shown, the first microphone 11 for detecting the sound from the first
direction first and the predetermined distance from the first microphone 11 are provided, and
the sound from the second direction is the most The second microphone 12 for detecting first,
the flip flop circuit (FF circuit) 13 to which the output signals A and B of the first and second
microphones 11 and 12 are input, and the first of the flip flop circuits 13 And a sound source
direction detection unit 14 to which the second output signals QA and QB are input.
[0018]
Here, the output signals A and B of the first and second microphones 11 and 12 are at high level
in the silent state, and are at low level when sound is input. The flip-flop circuit 13 receives an
output signal of each of two microphones of different combinations among the plurality of
microphones and outputs the sound to either of the microphones based on the output signals of
the two microphones. The first and second microphones 11, 12 function as at least one afterdestination detection means for detecting whether they have reached and, as shown in the circuit
diagram of the example in FIG. Output signals A and B of FIG. That is, as shown in FIG. 3, when
the output signal A of the first microphone 11 changes from high level to low level, the flip-flop
circuit 13 changes to low level when the first output signal QA changes to high level. The second
output signal QB changes to high level when low level, and when the output signal B of the
second microphone 12 changes from high level to low level, the first output signal QA changes to
high level when low level At the same time, the second output signal QB changes to low level
when it is at high level. When the level of the first or second output signal QA or QB of the flip
flop circuit 13 changes, the sound source direction detection unit 14 detects the first and second
output signal QA or QB of the flip flop circuit 13 after a predetermined time elapses. The sound
source direction is determined based on the detected levels of the first and second output signals
QA and QB of the flip-flop circuit 13 detected.
[0019]
Next, the operation of the sound source direction detection apparatus 10 according to the
present embodiment will be described with reference to FIG. As shown in FIG. 4, when sound is
generated from the first direction, the output signal A of the first microphone 11 changes from
high level to low level at time t1, and then the first microphone 11 and the second microphone
12 are generated. The output signal B of the second microphone 12 changes from the high level
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to the low level at time t2 delayed by the arrival time difference of the sound determined by the
interval between them. Thereby, the first output signal QA of the flip flop circuit 13 changes from
high level to low level at time t1, and the second output signal QB changes from low level to high
level, and the flip flop circuit 13 at time t2. The first output signal QA changes from the low level
to the high level, and the second output signal QB changes from the high level to the low level.
The sound source direction detection unit 14 detects the levels of the first and second output
signals QA and QB of the flip flop circuit 13 at time t3 delayed by a predetermined time from
time t2. As a result, since the level of the first output signal QA is high, the sound source
direction detection unit 14 determines the first direction as the sound source direction.
[0020]
On the other hand, when sound is generated from the second direction, the output signal B of the
second microphone 12 changes from high level to low level at time t4, and then it is determined
by the distance between the first microphone 11 and the second microphone 12 The output
signal A of the first microphone 11 changes from the high level to the low level at time t5
delayed by the arrival time difference of the sound. Thus, at time t4, the first output signal QA of
the flip flop circuit 13 remains high and the second output signal QB also remains low, but at
time t5 the first output of the flip flop circuit 13 As the signal QA changes from high level to low
level, the second output signal QB changes from low level to high level. The sound source
direction detection unit 14 detects the levels of the first and second output signals QA and QB of
the flip flop circuit 13 at time t6 delayed by a predetermined time from time t5. As a result, since
the level of the second output signal QB is high, the sound source direction detection unit 14
determines the second direction as the sound source direction.
[0021]
That is, based on the sound source direction detection principle shown in Table 1, the sound
source direction detection unit 14 detects which of two directions (first and second directions)
the sound source is present.
[0022]
In the above description, although the first and second directions are opposite directions on a
straight line (see FIG. 1), the first and second directions need to be always opposite directions on
a straight line There is no.
[0023]
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Next, a sound source direction detection apparatus according to a second embodiment of the
present invention will be described.
The sound source direction detection device 20 according to the present embodiment is a threeterminal sensor that detects in which of three directions (first to third directions) the sound
source is present, as shown in FIG. A first microphone 21 for detecting a sound from the first
direction first and a predetermined distance from the first microphone 21 are provided at a
predetermined distance and a sound from the second direction is detected first. A second
microphone 22 and a third microphone 23 provided at a predetermined distance from the first
and second microphones 21 and 22 and for detecting the sound from the third direction first.
The first flip flop circuit 24 to which the output signals A and B of the first and second
microphones 21 and 22 are input, and the output signals A and C of the first and third
microphones 21 and 23 are input 2 flip flop circuit 25 , The third flip-flop circuit 26 to which the
output signals B and C of the second and third microphones 22 and 23 are input, and the first
and second output signals Q1A and Q1B of the first flip-flop circuit 24; A sound source direction
detection unit 27 to which the first and second output signals Q2A and Q2C of the second flip
flop circuit 25 and the first and second output signals Q3B and Q3C of the third flip flop circuit
26 are input and Equipped with
[0024]
Here, the first to third flip flop circuits 24 to 26 receive the output signals of two microphones to
which the output signals of two microphones of different combinations among the plurality of
microphones are respectively input and are input. Functions as at least one after-destination
detection means for detecting to which microphone the sound first arrives, and has a
configuration similar to that of the flip-flop circuit 13 shown in FIG.
[0025]
As shown in Table 2, the sound source direction detection unit 27 detects the levels of the output
signals Q1A, Q1B, Q2A, Q2C, Q3B and Q3C of the first to third flip flop circuits 24 to 26, and the
first flip flop When the levels of the first output signal Q1A of the flip-flop circuit 24 and the first
output signal Q2A of the second flip-flop circuit 25 are high, the first direction is determined as
the sound source direction, and the first flip-flop circuit is determined. When the level of the 24
second output signal Q 1 B and the first output signal Q 3 B of the third flip flop circuit 26 is
high, the second direction is determined as the sound source direction, and the second flip flop
circuit 25 When the levels of the second output signal Q2C and the second output signal Q3C of
the third flip-flop circuit 26 are high, the third direction is determined as the sound source
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direction.
[0026]
The operation of the sound source direction detecting device 20 according to the present
embodiment is the same as the operation of the sound source direction detecting device 10
according to the first embodiment shown in FIG.
Also, the first to third directions do not necessarily have to be the three directions shown in FIG.
[0027]
Next, a sound source direction detection apparatus according to a third embodiment of the
present invention will be described.
The sound source direction detection device 30 according to the present embodiment is a fourterminal sensor that detects in which of four directions (first to fourth directions) the sound
source is present, and as shown in FIG. A first microphone 31 for detecting a sound from the first
direction first and a predetermined distance from the first microphone 31 are provided at a
predetermined distance and a sound from the second direction is detected first. A second
microphone 32 and a third microphone 33 provided at a predetermined distance from the first
and second microphones 31 and 32 and for detecting the sound from the third direction first. A
fourth microphone 34 provided at a predetermined distance from the first to third microphones
31 to 33 and for detecting the sound from the fourth direction first, and the first and second
microphones 31. , 32 output signals A and B are input Of the first and fourth microphones 31,
34 to which the output signals A, C of the first and third microphones 31, 33 are input. A third
flip-flop circuit 37 to which the output signals A and D are input, a fourth flip-flop circuit 38 to
which the output signals B and C of the second and third microphones 32 and 33 are input, and
The fifth flip-flop circuit 39 to which the output signals B and D of the fourth microphones 32
and 34 are input, and the sixth flip-flop to which the output signals C and D of the third and
fourth microphones 33 and 34 are input Circuit 40, first and second output signals Q1A and Q1B
of the first flip flop circuit 35, and first and second output signals Q2A of the second flip flop
circuit 36, 2C and the first and second output signals Q3A and Q3D of the third flip flop circuit
37 and the first and second output signals Q4B and Q4C of the fourth flip flop circuit 38 and the
fifth flip flop circuit 39 A sound source direction detection unit 41 to which the first and second
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output signals Q5B and Q5D and the first and second output signals Q6C and Q6D of the sixth
flip flop circuit 40 are input is provided.
[0028]
Here, the first to fourth flip flop circuits 35 to 40 receive the output signals of two microphones
to which the output signals of two microphones of different combinations among the plurality of
microphones are respectively input and are input. Functions as at least one after-destination
detection means for detecting to which microphone the sound first arrives, and has a
configuration similar to that of the flip-flop circuit 13 shown in FIG.
[0029]
As shown in Table 3, the sound source direction detection unit 41 outputs the output signals
Q1A, Q1B, Q2A, Q2C, Q3A, Q3D, Q4B, Q4C, Q5B, Q5D, Q5C of the first to fourth flip flop circuits
35-40. , Q6D levels are determined, and the sound source direction is determined as follows.
(1) The levels of the first output signal Q1A of the first flip-flop circuit 35, the first output signal
Q2A of the second flip-flop circuit 36, and the first output signal Q3A of the third flip-flop circuit
37 When the level is high, the first direction is determined as the sound source direction.
(2) The levels of the second output signal Q1B of the first flip-flop circuit 35, the first output
signal Q4B of the fourth flip-flop circuit 38, and the first output signal Q5B of the fifth flip-flop
circuit 39 When the level is high, the second direction is determined as the sound source
direction. (3) The levels of the second output signal Q2C of the second flip flop circuit 36, the
second output signal Q4C of the fourth flip flop circuit 38, and the first output signal Q6C of the
sixth flip flop circuit 40 When the level is high, the third direction is determined as the sound
source direction. (4) The levels of the second output signal Q3D of the third flip flop circuit 37,
the second output signal Q5D of the fifth flip flop circuit 39, and the second output signal Q6D of
the sixth flip flop circuit 40 When the level is high, the fourth direction is determined as the
sound source direction.
[0030]
The operation of the sound source direction detecting device 30 according to the present
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embodiment is the same as the operation of the sound source direction detecting device 10
according to the first embodiment shown in FIG. 1, and thus the detailed description thereof is
omitted. Also, the first to fourth directions do not necessarily have to be the four directions
shown in FIG.
[0031]
Next, a sound source direction detection apparatus according to a fourth embodiment of the
present invention will be described. The sound source direction detection device according to the
present embodiment is an n-terminal sensor that detects in which of n directions (first to n-th
directions) the sound source is present, and from the first to n-th directions First to n-th
microphones respectively receiving output signals of two microphones of different combinations
of the first to n-th microphones and the first to n-th microphones for detecting the sound first.
And an audio source direction detection unit to which an output signal of the first to n (n-1) / 2
flip flop circuits is input.
[0032]
Here, the first to n-th microphones are provided at predetermined intervals from other
microphones. The first to n-th (n-1) / 2 flip-flop circuits receive the output signals of two
microphones each having a different combination of the plurality of microphones and receive the
output of the two microphones It functions as at least one after-destination detection means for
detecting to which microphone the sound first reaches based on the signal, and has the same
configuration as the flip-flop circuit 13 shown in FIG. 2 and operates similarly. That is, when the
output signal of one of the input signals of the two microphones changes from the high level to
the low level, the first to n (n-1) / 2 flip-flop circuits The output signal changes to low level when
high level, and the second output signal changes to high level when low level, and when the
output signal of the other microphone changes from high level to low level, the first output signal
becomes When the level is low, the level changes to the high level, and when the level is high, the
second output signal changes to the level low.
[0033]
As shown in Table 4, the sound source direction detection unit detects the level of the output
signal of the first to n (n-1) / 2 flip flop circuits, and detects the first to n (n-1) / 2. The output
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signals of the m-th (m = 1 to n) microphone among the flip-flop circuits of (n-1) flip-flop circuits
to which the output signals of the (m-1 to n) flip-flop circuits are input are all m-th (m = 1 to n)
The m-th direction is determined as the sound source direction when it is indicated that the
output signal of the microphone of has changed from the high level to the low level. Table 4
shows the combination of the output signals of the two microphones input to each flip-flop
circuit, and the circle in the table represents the output signal of the microphone described in the
first row of the table. Indicates that it has changed from high level to low level.
[0034]
The operation of the sound source direction detection apparatus according to the present
embodiment is the same as the operation of the sound source direction detection apparatus 10
according to the first embodiment shown in FIG.
[0035]
Next, a sound source direction detection apparatus according to a fifth embodiment of the
present invention will be described.
The sound source direction detection apparatus 50 according to the present embodiment
includes first and second amplification circuits 53 and 54, and first and second differentiation
circuits 55 and 56 functioning as waveform shaping circuits. The output signals A and B of the
microphones 51 and 52 are amplified by the first and second amplification circuits 53 and 54,
and then the rising edges are made steep by the first and second differentiation circuits 55 and
56. This differs from the sound source direction detection device 1 according to the first
embodiment shown in FIG.
[0036]
Therefore, in the sound source direction detection device 50 according to the present
embodiment, even when the amplitudes of the output signals A and B of the first and second
microphones 51 and 52 are small or the rising waveform is jagged, the first and second Since the
amplitude can be increased by the amplification circuits 53 and 54 and the first and second
differentiation circuits 55 and 56, and the rising edge can be made steep to be input to the flipflop circuit 57, the direction of the sound source can be accurately detected. be able to.
[0037]
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Also in the sound source direction detecting devices according to the second to fourth
embodiments described above, the same effects as those of the sound source direction detecting
device 50 according to the present embodiment can be obtained by providing the amplifying
circuit and the differentiating circuit on the output side of each microphone. You can get it.
(Example 6)
[0038]
Next, an embodiment of a microphone used in the sound source direction detection apparatus
according to the present invention will be described. As for the microphone, in the case where
the sound propagated in the air is to be used, a normal condenser microphone or the like may be
used. However, for example, in the case of detecting an abnormal sound of a pipe exposed in
various kinds of noises (airborne sound) propagating in the air, the airborne sound is shut off and
the pipe necessary for Only abnormal sounds have to be extracted. Therefore, in such a case, a
solid-borne internal sound collecting microphone 100 shown in FIG. 8 is used as a microphone
for blocking the propagating sound in the air and collecting only the sound propagating in the
pipe.
[0039]
The solid-in-propagation sound collection microphone 100 includes a solid-in-progression sound
collection microphone container 110 in which one surface is a sound collection unit 111 and
rubber-like clay filled in the solid-in-propagation sound collection microphone container 110. A
solid-state propagating sound transmitting material 120 and a microphone 130 such as a
condenser microphone provided in the solid-state propagating sound transmitting material 120
in the solid-state sound collecting microphone container 110 are provided. That is, in order to
block sound propagating in the air and efficiently collect sound propagating in the pipe 140, the
solid-state sound propagating microphone 100 covers the entire microphone 130 with the
sound-transmitting substance 120 in solid state. While being accommodated in the solid medium
propagation sound collection microphone container 110, the sound collection part 111 of the
solid medium propagation sound collection microphone container 110 can be brought into close
contact with the surface of the pipe 140. As a result, in the solid-state propagated sound
collecting microphone 100, only the abnormal sound from the pipe 140 can be taken in from the
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sound collecting unit 111 of the solid-borne sound collecting microphone container 110 and
detected by the microphone 130.
[0040]
As described above, the sound source direction detection apparatus and method according to the
present invention is not limited to, for example, detection of abnormal sound occurrence points
of nuclear power plant piping equipment, and spacer insulation failure of GIS equipment
currently in the mainstream of power distribution equipment. It can be used to detect ground
fault occurrence locations due to ground noise, as well as to detect abnormal noise occurrence
sites in any equipment that produces abnormal sounds, such as when abnormal sounds occur in
petroleum complexes or when precursor signs of abnormal occurrences occur.
[0041]
It is a figure which shows the structure of the sound source direction detection apparatus by the
1st Example of this invention.
(Embodiment 1) FIG. 6 is a circuit diagram showing an example of the flip flop circuit 13 shown
in FIG. (Embodiment 1) FIG. 6 is a timing chart for illustrating the operation of the flip flop circuit
13 shown in FIG. (Embodiment 1) FIG. 5 is a timing chart for explaining the operation of the
sound source direction detection apparatus 10 shown in FIG. (Embodiment 1) FIG. 6 is a diagram
showing the configuration of a sound source direction detection apparatus according to a second
embodiment of the present invention. (Embodiment 2) FIG. 7 is a diagram showing the
configuration of a sound source direction detection apparatus according to a third embodiment
of the present invention. (Embodiment 3) FIG. 15 is a diagram showing the configuration of a
sound source direction detection apparatus according to a fifth embodiment of the present
invention. (Embodiment 5) FIG. 10 is a diagram showing the configuration of an embodiment of a
microphone used in the sound source direction detection apparatus according to the present
invention. (Example 6)
Explanation of sign
[0042]
10, 20, 30, 50 Sound source direction detecting device 11, 12, 21-23, 33-34, 51, 52, 130
Microphone 13, 24-26, 35-40, 57 Flip-flop circuit 14, 27, 41, 58 Sound source direction
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detection unit 53, 54 Amplifier circuit 55, 56 Differentiator circuit 100 Solid-borne sound
collecting microphone 111 Sound collecting unit 110 Solid-borne sound collecting microphone
container 120 Solid-borne sound transmitting substance 140 Piping
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