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JPS6358182

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DESCRIPTION JPS6358182
[0001]
[Industrial application field J] The present invention relates to a sound source search apparatus
that performs sound image processing on sound generated from an rf source object and
superimposes this sound image on the object image of the YfrA object for visual display. is there.
[Conventional Technique 1 For example, when noise measures are taken in mechanical
equipment or factories, or when the nature, size, etc. of sound is searched and measured, it is
necessary to accurately detect the source of the noise. In order to easily and accurately search
and measure the position, the size, the spread, etc., a sound source search method using a sound
collection device has been developed by the present inventors. First, the principle of this sound
source search method is shown in FIG. That is, as shown in the figure, a sound source S is
provided at a position P, and a reflection type sound collector having a concave surface shape
such as a paraboloid surface or a concave spherical surface at a position separated from the
position P by a distance When disposed toward the sound source S, the sound from the sound
source S is reflected by the reflecting surface r of the sound collector, and the sound image S 'is
formed at the position of P'. Therefore, if a microphone array in which a large number of
microphones are juxtaposed in a matrix at this sound image forming position P 'is disposed
opposite to the reflecting surface r, the sound pressure distribution on the microphone array is
based on the sound pressure distribution. First, it becomes possible to output as a sound image.
The sound image thus obtained can be displayed in an analog manner as a difference in
brightness of the light emitting diodes, for example, in a light emitting diode array formed by
arranging the light emitting diodes in correspondence with the microphones constituting the
microphone array. By digitizing the signal from the microphone array and displaying it with
contour lines or the like for each sound pressure level, the sound image can be visualized and
displayed. Further, in order to display the sound image superimposed on the object image of the
sound source object, an object image pickup device comprising a camera, a TV camera or the like
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is used to pick up an object image of the sound source object by the object image pickup device
By superimposing the image on the sound image and displaying it, the sound source position of
the noise in the sound source object and the distribution for f can be displayed in
correspondence with each component of the sound source object to be searched, and sound
source search can be easily performed. It will be possible to do with high precision. [Problems to
be Solved by the Invention 1] As described above, the sound source tracking device is configured
to? When performing source search for a source object, it is necessary to make the sound image
correspond to the object image correctly. For example, if the visual field range between the
sound image and the object image is deviated, both images will be accurate. It will not be possible
to overlap, which will reduce the sound source search accuracy.
The present invention has been made in view of the point on the point of view, and it is an object
of the present invention to provide a sound source tracking device which can accurately display a
sound image and an object image in an overlapping manner. . [Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention arranges a sound collector
with a concave curved surface such as a paraboloid of revolution, a concave spherical surface,
etc. toward the sound source object, A microphone array, in which a large number of
microphones are arranged in a matrix, is disposed opposite to a sound collector, and a sound
image is formed by receiving the reflected sound from the sound collector by the microphone
array, and the sound source object In the sound source tracking device for capturing an object
image of the object by the object image capturing device and superimposing the object image
and the sound image and displaying the same, the microphone array and the object image
capturing device on the mirror axis of the sound collector The microphone array is directed to
the sound collector side, the object image pickup device is disposed to be directed to the sound
source object side, and the focal plane of the object image pickup device is provided at a position
close to the microphone array. What it features A. [Operation l As described above, both the
microphone array and the object image pickup device are disposed on the mirror axis of the
sound collector], and further include the focal plane of the sound collector functioning as an
acoustic lens, and the optical lens Since the object image pickup apparatus is disposed at a
position close to the focal plane, the visual field range between the sound image and the object
image can be matched exactly. Therefore, if the microphone array, which is the sound image
forming plane in the sound collector, is focused, and if the camera as an object image pickup
device or the TV camera etc. is focused, the sound image and the object image match exactly. It is
possible to visualize and display the position of the noise in the sound source object, the sound
pressure distribution, and the like in a state in which they correspond precisely to the respective
component parts, and to perform the search for the sound source and its analysis with high
accuracy. Embodiment 1 Hereinafter, an embodiment of the present invention will be described
in detail based on the drawings. First, in FIGS. 1 and 2, reference numeral 1 denotes a sound
collector having a concave surface shape such as a paraboloid of revolution, a concave spherical
surface, etc. The noise from the sound source object is detected on the surface side of the sound
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collector 1 A reflecting surface 1a to be reflected is formed, and a microphone array 2
constituting a focal plane for forming a sound image is disposed opposite to the reflecting
surface 1a. The microphone array 2 is configured by arranging a large number of microphones
2a respectively provided toward the reflection surface 1a in a matrix as shown in FIG. 3, and
these microphones 2a are mounted on the support plate 3 A sound absorbing material is
interposed between the microphones 2a so that the microphones 2a are not affected by
vibration.
Further, the support plate 3 is attached to a wiring box 4 for storing the wiring of each
microphone 2a, a bracket 5 is provided on the back of the wiring box 4, and the bracket 5 is
directed to the sound source object. A TV camera 6 constituting an object image capturing
apparatus for capturing a t′′f source object is mounted. As described above, by attaching the
TV camera 6 to the back of the wiring box 4, the microphone array 2 as the focal plane on which
the sound image is formed is disposed so that the focal plane of the TV camera 6 is close to each
other. It is done. The collection unit 1 includes a core piece 7 having a circular shape in plan view
and a peripheral piece 8 formed by dividing an annular peripheral surface portion surrounding
the core piece 7 into a plurality of pieces at equal intervals in the radial direction. The joint
portions 7a and 8a protruding in the back surface direction are respectively formed around the
entire circumference of the peripheral portion of the core piece 7 and the circumferential surface
piece 8. As shown in FIG. Are these parts 7, 8 connected to each other? a and 8a are joined
together, these junctions 7a and 8a or junctions 7a,? (a) It can be assembled by connecting with a
connecting member such as a hook member or a bolt attached between them. Next, as shown in
FIG. 4, at the surface side of the core piece 7, there are provided four receiving portions 8 at each
of the receiving portions 8, and the supporting frame 10 is constructed in each receiving portion
8. The support frame 10 is configured to be detachably attachable to the core piece 7 by
engaging the hooks 11 connected to the four-legs 10a. The support frame 10 includes a bridge
10b for connecting between the above-mentioned four wooden footrests 10a and each pair of
two or more of the respective footrests 10a, and a bridge for bridging between the respective
connection troughs 10b. A guide portion 12 is fixed to the connecting rod 10b, and the guide
member 12 has a microphone array 2.b. The support plate 3 reciprocates the frame 13 mounted
with the image receiving unit consisting of the wiring box 4 and the T4 camera 5 along the
mirror axis C on the reflecting surface 1a of the sound collector 1 in a direction approaching or
separating from the sound collector 1 It can be moved. A screw shaft 14 is screwed into the
frame 13 in order to move the frame 13. The screw shaft 14 is extended through the core piece
7 to the back surface side of the sound collector 1, and the image receiving unit is mirrord by
screwing the screw shaft 14 from the back surface side of the sound collector 1. By moving along
the axis C, adjustment of the focal position of the microphone array 2 can be performed. Further,
the footrest 10a of the support frame 10 is formed of a hollow member such as a metal pipe, and
the wiring cable 15 from the microphone array 2 and the TV camera 5 is inserted into the inside
thereof. It is configured to be connected to the provided terminal connection portion 16.
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Among the signals sent via the wiring cable 15 described above, the signal from the microphone
array 2 is input to the data processing device 17 to digitize the sound reception signal of each of
the microphones 2 a that constitute the microphone array 2. It is converted into a signal relating
to contour lines for each sound pressure level within a predetermined range. The signal relating
to the contour line is configured to be input to a display device 18 comprising a television
monitor or the like, and a video signal of an object image from the TV camera 6 is input to the
display device 18. The signals relating to the sound image and the signal relating to the object
image are displayed on the display 18 in a superimposed state. In the figure, reference numeral
19 denotes a tripod, and reference numeral 20 denotes a support member connected to the
tripod 19. The sound collector 1 is configured to be supported by the support member 20
mounted on the tripod 18-hi. The present embodiment is configured as described above, and its
operation will be described next. First, as shown in FIG. 1 and FIG. 2, the sound collector 1 is
assembled, and the core piece 7 is attached to the supporting frame supporting the image
receiving unit consisting of the microphone array 2 and the TV camera 6 etc. 10 is attached to
the support portion phase 18 in a mounted state, and set so that the reflective surface 1a of the
sound collector l faces the sound source object. Here, since the microphone array 2 and the TV
camera 6 are installed on the mirror axis C of the sound collector 1, the optical axis in the TV
camera 6 is located on the mirror axis C. In addition, since the focal plane of the TV camera 6 is
at a position close to the microphone array 2, the image view range of the sound image and the
object image is held in the same state. Therefore, the focus adjustment of the microphone array 2
is performed by appropriately screwing the screw rod 14, and the focus of the TV camera B is
adjusted to bring the sound image and the object image into focus. Therefore, when sound is
generated from the sound source object, this 1 ′ ′? Is reflected by the reflection surface 1a of
the sound collector 1, received by each microphone 2a constituting the microphone array 2, and
converted into an electrical signal according to the received sound pressure level. This electric
signal is taken out through the wiring cable 15 and input to the data processing unit 17, where
signal processing for forming a sound image is performed. This signal processing consists of
forming data relating to the sound positive in each predetermined level range, data relating to
the peak value of the sound pressure, etc., and forming the aforementioned data for each
frequency. By processing the data in this manner, a sound image having a desired property is
formed, and this sound image is visualized and displayed on the display device 18.
At the same time, the video signal of the object image of the sound source object from the TV
camera 6 is input on the first day of the display device, and the object image of the sound source
object is displayed in a superimposed state on the above sound image. Thus, as described above,
since the sound image from the sound source object and the object image completely match on
the display device 18, the sound pressure level of the sound generated from the sound source
object is set to each component of the sound source object. It becomes possible to visualize and
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display in a state in which it accurately corresponds to the above, and it becomes possible to
perform highly accurate sound source search. Thus, the microphone array 2 for forming a sound
image is collected along the mirror axis C because the rf image forming surface is different
depending on the distance between the sound collector 1 and the sound source object. It is
necessary to perform focusing by moving the sound device l in the direction in which the
distance is close to 1111. When the microphone array 2 is moved in this way, the angle of view
of the sound image is changed. Both the angles of the TV camera B for the camera also change
according to the distance between the sound source object and the TV camera 6, and the focal
plane of the TV camera 6 and the microphone array 6 are disposed close to each other. As a
result, there is almost no difference between the two angles of view. Therefore, regardless of the
distance between the sound source object to be searched and the sound collection equipment,
the sound image and the object image are accurately superimposed. It will be possible to [Effects
of the Invention] As described in detail above, in the sound source tracking device according to
the present invention, the microphone array for forming a sound image and the object image
forming device are mutually connected on the mirror axis of the sound collector. The
configuration in which the focal planes are arranged close to each other makes it possible to
superimpose and display the sound image and the object image very accurately, and the sound
source search accuracy is significantly improved.
[0002]
Brief description of the drawings
[0003]
1 to 4 show an embodiment of the present invention, and FIG. 1 is an external view showing an
entire configuration of a sound source tracking device, FIG. 2 is a front view of FIG. 1, and FIG.
FIG. 4 is a front view of the array, FIG. 4 is an external view of an image receiving unit, and FIG. 5
is a principle explanatory view of a sound source type sound source search system.
l: sound collector, 1a: reflective surface, 2: microphone array, 2a: microphone, 6: TV camera, 14:
vertical axis, 17: data processing device, 18: display device.
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