JP2011188016A - Monitoring camera device with sound source direction estimating function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitoring camera device with a sound source direction estimating function, capable of directly and unfailingly capturing a video image in which the direction of a sound source is indicated. <P>SOLUTION: Microphones M1-M5 are attached to a frame 15, and a monitoring camera 12 and a transparent display 13 are attached to a camera attaching member 14. The camera attaching member 14 is attached to the frame 15 via a stepping motor 16. The sound source direction is estimated by using sound pressure signals outputted from the microphones M1-M5. Then, if the magnitude of a horizontal angle θ' of the estimated sound source direction is within the view field of the monitoring camera 12, a figure indicating the sound source direction θ' is displayed on the transparent display 13, and if the magnitude of the horizontal angle θ' is larger than the maximum view field, the camera attaching member 14 is rotated so that the image pickup direction of the monitoring camera 12 can be the estimated sound source direction before displaying the figure indicating the estimated sound source direction θ' on the transparent display 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a monitoring camera device with a sound source direction estimating function capable of shooting an image in which the direction of a sound source is displayed.

Conventionally, as a method of estimating the direction of sound arrival, a microphone array in which a large number of microphones are arranged at equal intervals is constructed, and the direction of the sound source, which is the direction of sound wave arrival, is estimated from the phase difference of each microphone relative to the reference microphone. A so-called acoustic technique has been devised (see, for example, Non-Patent Document 1).
On the other hand, not a phase difference between output signals of a plurality of microphones arranged at a measurement point, but a plurality of microphone pairs arranged in a straight line intersecting each other from the plurality of microphones, and the position between the two microphones constituting the pair There has been proposed a method for estimating the direction of a sound source from a ratio between an arrival time difference corresponding to a phase difference and an arrival time difference between two pairs of other microphones (see, for example, Patent Documents 1 to 3).

  Specifically, as shown in FIG. 6, two microphone pairs (M1, M3) and microphone pairs (four microphones M1 to M4) are arranged at predetermined intervals on two straight lines orthogonal to each other. M2, M4) are arranged so as to constitute the microphone pair (M1, M3) and the microphones constituting the microphone pair (M2, M4) and the arrival time difference of the sound pressure signals input to the microphones M1, M3. The horizontal angle θ between the measurement point and the position of the sound source is estimated from the ratio with the arrival time difference between the sound pressure signals input to M2 and M4, and the fifth microphone M5 is not on the plane formed by the microphones M1 to M4. Further, four microphone pairs (M5, M1), (M5, M2), (M5, M3), (M5, M4) are configured and arranged in the positions. The elevation angle φ formed by the measurement point and the position of the sound source is estimated from the arrival time difference between the microphones constituting the phone pair.

As a result, the direction of the sound source can be accurately estimated with a smaller number of microphones as compared with the case where the direction of the sound source is estimated using the microphone array.
Also, at this time, a video of the sound source direction estimated by the video sampling means such as a CCD camera is taken, and this video data and the sound source direction data are synthesized to generate the sound source direction and sound pressure estimated in the video. If the level is displayed as a graphic, the sound source can be visually grasped.

Japanese Patent Laid-Open No. 2002-181913 JP 2006-324895 A JP 2008-224259 A

Toshiro Oga, Yoshio Yamazaki, Yutaka Kaneda; Acoustic system and digital processing, Corona, 1995

However, in the above-described conventional method, image data obtained by combining image data of captured video and sound source direction data is created, and this image data is displayed on a display to estimate a sound source. When this method is applied to a surveillance camera that continuously captures on-site images, it is necessary to perform image processing after the capturing.
In addition, since the surveillance camera has a narrow field of view, the estimated sound source direction may not be included in the field of view of the photographed surveillance camera. At this time, it is conceivable to use a camera with a wide-angle lens as the surveillance camera. However, when a wide-angle lens is used, the distortion of the image increases, which causes a problem that it is difficult to estimate the sound source.

  The present invention has been made in view of conventional problems, and an object of the present invention is to provide a monitoring camera device with a sound source direction estimation function that can directly and reliably capture an image in which the direction of a sound source is displayed. To do.

The present invention is a surveillance camera device with a sound source direction estimation function that estimates the direction of a sound source and shoots a video in which the estimated direction of the sound source is displayed. A microphone, a microphone mounting member for attaching the plurality of microphones, a surveillance camera that captures indoor or outdoor images, a transparent display that is transparent in a non-display state, the surveillance camera and the transparent display, and a transparent display. A camera mounting member that is mounted so as to be positioned in front of the lens of the surveillance camera, a sound source direction estimating unit that estimates a sound source direction using a sound pressure signal output from each microphone, and a camera rotating unit that rotates the camera mounting member The camera rotation means based on the estimated sound source direction. As photographing direction becomes the estimated sound source direction, the camera mounting member is rotated, the transparent display, and displaying a figure indicating the estimated sound source direction.
As a result, even when the horizontal angle θ and the elevation angle φ of the sound source direction are large, it is possible to capture a clear image of the sound source estimation direction without collecting sound information and estimating the sound source direction again.

Further, the present invention is characterized in that the camera attachment member is attached to the microphone attachment member via the camera rotation means.
As a result, a clear image of the sound source estimation direction can be taken with a simple configuration of one rotating means such as a stepping motor.

In the present invention, the microphone attachment member is attached to the camera attachment member via a microphone rotation means, and the microphone rotation means moves the microphone attachment member in a direction opposite to the camera attachment member, and The camera mounting member is rotated by the same angle.
Thereby, even if the microphone mounting member is made small, the microphone mounting member does not enter the field of view of the surveillance camera, and thus the apparatus can be miniaturized.

The present invention also provides the first to fourth microphones constituting the two microphone pairs in which the plurality of microphones are arranged on the two straight lines intersecting each other at predetermined intervals, and the two microphone pairs. And a phase difference ratio between the microphones constituting the two pairs of microphones, the fifth microphone, and the second microphone. Estimating the sound source direction (horizontal angle θ and elevation angle φ) using the phase difference between the microphones constituting the four microphone pairs configured with each of the four microphones constituting the pair of microphone pairs. It is characterized by.
As a result, the horizontal angle θ and the elevation angle φ in the sound source direction can be estimated efficiently and accurately with a small number of microphones.

  The summary of the invention does not list all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

It is a functional block diagram which shows the structure of the monitoring camera apparatus with a sound source direction estimation function which concerns on embodiment of this invention. It is a figure for demonstrating the positional relationship of a microphone, a transparent display, and a surveillance camera. It is a figure which shows an example of the image | video of a surveillance camera. It is a flowchart for demonstrating operation | movement of the monitoring camera apparatus with a sound source direction estimation function. It is a figure which shows the other structure of the monitoring camera apparatus with a sound source direction estimation function. It is a figure which shows the arrangement | sequence of the microphone in the conventional sound source estimation method.

  Hereinafter, the present invention will be described in detail through embodiments, but the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

FIG. 1 is a functional block diagram illustrating a configuration of a monitoring camera device 10 with a sound source direction estimation function.
In the figure, 11 is a sound collection unit having a plurality of microphones M1 to M5, 12 is a surveillance camera, 13 is a transparent display, 14 is a camera mounting member, 15 is a frame as a microphone mounting member, and 16 is a camera rotating means. Stepping motor 17, 17 is a motor control means, and 20 is an arithmetic unit.
The sound collection unit 11 includes five microphones M1 to M5 and a fixing base 11D for arranging and fixing these microphones M1 to M5 as follows.
The arrangement of the microphones M1 to M5 is the same as that shown in FIG. 6, and two microphone pairs (M1, M1) are arranged with four microphones M1 to M4 arranged at predetermined intervals on two straight lines orthogonal to each other. M5) and the microphone pair (M2, M4) are arranged so that the fifth microphone M5 is not on the plane formed by the microphones M1 to M4, specifically, the square formed by the microphones M1 to M4 It arranges at the position of the apex of the quadrangular pyramid as the bottom. Thereby, four pairs of microphones (M5, M1) to (M5, M4) are further configured.

The surveillance camera 12 may be any camera provided with a storage device capable of storing a long-time video. In this example, a color CCD camera was used.
The transparent display 13 is transparent in a non-display state, and when display data is input, the display portion becomes opaque. For example, the transparent display 13 is transparent with an electroluminescent element (EL element) made of a thin film with high transmittance. A known transparent display such as an EL display in which an electrode is sandwiched between glass substrates or a monochromatic display in which a liquid crystal display element and a polarizing plate are combined can be used.

The camera mounting member 14 includes a camera support member 14a that supports the monitoring camera 12, a display support member 14b that supports the transparent display 13, and a connecting member 14c that connects these support members 14a and 14b. The transparent display 13 is attached so that the transparent display 13 is positioned in front of the lens of the monitoring camera 12 and the optical axis of the lens passes through the center of the transparent display 13. The display surface 13m of the transparent display 13 is orthogonal to the lens optical axis k indicated by the alternate long and short dash line in FIG.
Here, the size of the visual field of the monitoring camera 12 is the size of the display unit of the transparent display 13. That is, as shown in FIGS. 2A to 2C, the angle α formed by the line connecting the focal point O of the surveillance camera 12 and both ends A and A ′ in the width direction (the x direction described later) of the transparent display 13 is horizontal. The angle β is a visual field in the elevation direction, and an angle β formed by a line connecting both ends of the focal point O and the height direction (z direction described later) of the transparent display 13 is the visual field in the elevation direction. Note that D in the figure is the distance between the surveillance camera 12 and the transparent display 13, and z _m is the distance between the center of the transparent display 13 and the centers of the microphones M1 to M5.
Here, assuming that the focus position at the initial position of the monitoring camera 12 is the origin O (0, 0, 0), the position coordinates of the center O _D of the transparent display 13 are (0, D, 0), and the microphones M1 to M4. The position coordinates of the center O _m of (0, D, z _m ).

The frame 15 includes a beam-shaped bottom plate 15a constituting the bottom surface, a side plate 15b extending from both ends of the bottom plate 15a in a direction orthogonal to the bottom plate 15a, and two side plates arranged to face the bottom plate 15a. It is a frame-shaped member provided with the top plate 15c which connects 15b.
Hereinafter, the surface on which the bottom plate 15a extends is defined as the xy plane, and the extending direction of the side plate 15b is defined as the z direction. In addition, although an xy plane does not necessarily indicate a horizontal plane, in this example, in order to simplify the description, the horizontal plane is an xy plane and the z direction is an up-down direction. Moreover, let the extending direction of the baseplate 15a be an x direction.

The stepping motor 16 is driven by a control pulse signal from the motor control means 17. The motor control means 17 converts information on a designated rotation angle Θ described later into a pulse signal and outputs it to the stepping motor 16.
The sound collection unit 11 and the arithmetic unit 20 are attached to the top plate 15 c of the frame 15, and the camera attachment member 14 is attached to the bottom plate 15 a via the stepping motor 16. The motor control means 17 is attached to the bottom plate 15a. At this time, the sound collection unit 11 and the camera are mounted so that the center position of the transparent display 13 is on the rotation axis of the stepping motor 16 and the rotation axis of the stepping motor 16 coincides with the center lines of the microphones M1 to M5. It is preferable to attach the member 14 to the frame 15.
At the time of attachment (hereinafter referred to as the initial position), the camera attachment member 14 is attached to the frame 15 so that the lens optical axis of the monitoring camera 12 is perpendicular to the frame 15.
The motor control means 17 may be mounted on the top plate 15 c together with the arithmetic device 20 or may be incorporated in the arithmetic device 20.
The computing device 20 is connected to the sound collection unit 11, the transparent display 13, and the motor control means 17 by a cable (not shown).

The arithmetic unit 20 includes an amplifier 21, an A / D converter 22, a storage unit 23, a sound source direction estimation unit 24, a coordinate conversion unit 25, a rotation determination unit 26, and a display control unit 27.
The amplifier 21 includes a low-pass filter, removes high-frequency noise components from the sound pressure signals of the sounds collected by the microphones M1 to M5, amplifies the sound pressure signals, and outputs them to the A / D converter 22. The A / D converter 22 creates sound pressure waveform data obtained by A / D converting each sound pressure signal, and outputs the sound pressure waveform data to the storage means 23.
The storage means 23 is coordinate data O _m (0, 0) of the center positions of the microphones M1 to M4 when the sound pressure waveform data subjected to A / D conversion and the position coordinates of the focus at the initial position of the monitoring camera 12 are used as the origin. D, z _m ) is stored. 2A, D is the distance between the center of the transparent display 13 and the focus position of the surveillance camera 12, and z _m is the distance between the center of the transparent display 13 and the centers of the microphones M1 to M4. is there. The center of the transparent display 13 is on the lens optical axis z that is the photographing direction of the monitoring camera 12.

The sound source direction estimating means 24 takes out the sound pressure waveform data from the storage means 23, obtains the phase difference between the microphones M1 to M5 from the extracted sound pressure waveform data, and determines the sound source direction from the obtained phase difference. The horizontal angle θ and the elevation angle φ are estimated and output to the coordinate conversion means 25.
The horizontal angle θ and the elevation angle φ are estimated for each predetermined frequency band. Details of the estimation of the sound source direction will be described later.

In the coordinate conversion unit 25, the microphone estimated by the sound source direction estimation unit 24 using the coordinate data O _m (0, D, z _m ) of the coordinate data of the center position of the microphones M <b> 1 to M <b> 4 stored in the storage unit 23. The horizontal angle θ and the elevation angle φ formed by the central positions of M1 to M4 and the sound source are converted into the horizontal angle θ ′ and the elevation angle φ ′ when viewed from the monitoring camera 12 and output to the display control means 27. The horizontal angle θ ′ is output to the rotation determination means 26. Details of coordinate conversion are omitted.

The rotation determination unit 26 compares the horizontal angle θ ′ when viewed from the monitoring camera 12 with the visual field α in the horizontal angle direction, and the magnitude of the horizontal angle θ ′ is α / 2−γ (γ is about 10 °). Is exceeded, the horizontal angle θ ′ and the elevation angle φ ′ are output to the display control means 27, and the horizontal angle θ ′ is output to the motor control means 17 and the display control means 27 as the designated rotation angle Θ.
When the horizontal angle θ ′ is equal to or smaller than α / 2−γ, the horizontal angle θ ′ and the elevation angle φ ′ are output to the display control means 27 as they are.

On the display surface 13m of the transparent display 13, the x axis represents θ ′, and the y axis represents φ ′. In this example, the center position of the display surface 13m is the origin.
The display control means 27 creates a graphic indicating the sound source direction on the coordinate data (θ ′, φ ′) obtained by converting the sound source direction data. FIG. 3A is a diagram showing an example thereof. In this example, the graphic indicating the direction of the sound source is a round mark R with a mesh pattern. The center of the circle is a point representing the coordinate data (θ ′, φ ′), and the radius is the magnitude of the sound pressure signal collected by each of the microphones M1 to M5. When displaying the sound source direction of a preset frequency band, or when displaying the sound source direction for each frequency band, the color of the circle R may be set according to the frequency band.
As a result, when the sound source 50 is reflected in the video imaged by the monitoring camera 12, the sound source 50 is imaged with a round mark R having a mesh pattern.
When it is determined that the magnitude θ ′ _M of the horizontal angle θ ′ exceeds α / 2−γ, the display control means 27 displays the display surface 13m on the display surface 13m as shown in FIG. The center position is changed from (θ ′ = 0, φ ′ = 0) to (θ ′ = θ ′ _M = Θ, φ ′ = 0), and a mesh pattern circle R is displayed.

すなわち、互いに直交する２直線上にそれぞれ所定の間隔で配置された２組のマイクロフォン対（Ｍ１，Ｍ３）及びマイクロフォン対（Ｍ２，Ｍ４）を構成するマイクロフォンＭ１，Ｍ３に入力する音圧信号の到達時間差Ｄ₁₃と、前記マイクロフォン対（Ｍ２，Ｍ４）を構成するマイクロフォンＭ２，Ｍ４に入力する音圧信号の到達時間差Ｄ₂₄との比から、計測点と音源位置との水平角θを推定し、前記到達時間差Ｄ₁₃，Ｄ₂₄と、前記第５のマイクロフォンＭ５と他のマイクロフォンＭ１〜Ｍ４との到達時間差Ｄ_5j（ｊ＝１〜４）とから計測点と音源位置との成す仰角φを推定する。 The calculation method of the horizontal angle θ and the elevation angle φ is as follows.
When the arrival time difference between the microphone Mi and the microphone Mj of each microphone pair (Mi, Mj) is D _ij , the horizontal angle θ and the elevation angle φ, which are the sound incident directions, are expressed by the following equations (1) and (2). Therefore, by analyzing the frequency of the output signals of the microphones M1 to M5 using an FFT and calculating the arrival time difference D _ij between the microphones M _i and M _j at the target frequency f, the horizontal angle is calculated. θ and elevation angle φ can be obtained.

That is, arrival of sound pressure signals input to the microphones M1 and M3 constituting the two microphone pairs (M1, M3) and the microphone pairs (M2, M4) arranged at predetermined intervals on two orthogonal lines. The horizontal angle θ between the measurement point and the sound source position is estimated from the ratio between the time difference D ₁₃ and the arrival time difference D ₂₄ of the sound pressure signals input to the microphones M2 and M4 constituting the microphone pair (M2, M4). The elevation angle φ between the measurement point and the sound source position is estimated from the arrival time differences D ₁₃ and D ₂₄ and the arrival time differences D _5j (j = 1 to 4) between the fifth microphone M5 and the other microphones M1 to M4. To do.

水平角θと仰角φとは、ｆを中心周波数とする所定の帯域幅を有する周波数帯域毎に求めることができる。 The arrival time difference D _ij is obtained as a cross spectrum P _ij (f) of signals input to the two microphone pairs (M _i , M _j ), and further, the phase angle information ψ ( rad) and is calculated using the following equation (3).

The horizontal angle θ and the elevation angle φ can be obtained for each frequency band having a predetermined bandwidth with f as the center frequency.

The operation of the monitoring camera apparatus 10 with the sound source direction estimating function according to the present invention will be described with reference to the flowchart of FIG. At the start of the operation of the monitoring camera 12, it is assumed that the camera mounting member 14 is orthogonal to the initial position, that is, the frame 15 and the lens optical axis k.
First, sound information is collected by the microphones M1 to M5 while the monitoring camera 12 captures the monitoring target (step S10). Then, after the sound information is amplified by the amplifier 21, it is A / D converted by the A / D converter 22 and stored in the storage means 23 as sound pressure waveform data (step S11).
Next, the sound source direction estimation means 24 obtains the phase difference between the microphones M1 to M5 from the sound pressure waveform stored in the storage means 23, and the horizontal angle θ and the elevation angle φ, which are the sound source directions, are determined from the obtained phase difference. Is estimated (step S12).

After the estimation of the sound source direction is completed, the estimated horizontal angle θ and elevation angle φ are converted into the horizontal angle θ ′ and elevation angle φ ′ viewed from the monitoring camera by the coordinate conversion means 25 (step S13). .
Then, the rotation determination means 26 compares the horizontal angle θ ′ with the visual field α in the horizontal angle direction (step S14). When the size of the horizontal angle θ ′ is α / 2−γ or less, the horizontal angle θ ′ and the elevation angle φ ′ are output to the display control means 27 as they are, and the coordinate data is centered on the display surface 13 m of the transparent display 13. A mesh-shaped circle R, which is a point representing (θ ′, φ ′) and whose radius is the size of the sound pressure signal collected by each microphone, is drawn (step S15). The surveillance camera 12 captures an image in which the mesh-shaped circle R is reflected.

If the magnitude of the horizontal angle θ ′ exceeds α / 2−γ in step S14, the process proceeds to step S16, where the horizontal angle θ ′ is output to the display control means 27 and the horizontal angle θ ′ is designated. The rotation angle Θ is output to the motor control means 17, the stepping motor 16 is rotated, and the surveillance camera 12 and the transparent display 13 are rotated by the designated rotation angle Θ (step S16).
The transparent display 13 changes the coordinate of the origin from (0, 0) to (Θ, 0), and draws the mesh-shaped circle R on the display surface 13m with the origin changed (step S17). The surveillance camera 12 captures an image in which the mesh-shaped circle R is reflected.

  Thereby, the surveillance camera 12 can always take an image showing the estimated position of the sound source. Note that when the volume of the sound falls below a certain level, the camera mounting member 14 is returned to the initial position. Furthermore, when a sound larger than a certain level is generated, the camera mounting member 14 is rotated so that the camera mounting member 14 is rotated so that the lens optical axis of the surveillance camera 12 faces a new sound source direction. Alternatively, the direction of the sound being measured may be photographed as it is.

As described above, in the present embodiment, the fixed base 11D having the microphones M1 to M5 attached to the top plate 15c of the frame 15 is attached, the surveillance camera 12 and the transparent display 13 are attached to the camera attachment member 14, and the transparent display is provided. 13 is mounted so as to be positioned in front of the lens of the monitoring camera 12, and the camera mounting member 14 is mounted on the bottom plate 15a of the frame body 15 via the stepping motor 16, and the sound pressure signals output from the microphones M1 to M5 are used. After estimating the sound source direction, if the estimated horizontal angle θ ′ of the sound source direction is within the field of view of the monitoring camera 12, a graphic indicating the estimated sound source direction θ ′ is displayed on the transparent display 13. At the same time, when the estimated horizontal angle θ ′ of the sound source direction exceeds the maximum field of view of the monitoring camera 12, the shooting direction of the monitoring camera 12 is changed. Since the figure indicating the estimated sound source direction θ ′ is displayed on the transparent display 13 after the camera mounting member 14 is rotated so as to be the estimated sound source direction, the estimated position of the sound source can be obtained with a simple configuration. You can shoot images with
The estimated horizontal angle θ ′ is obtained by converting the horizontal angle θ when the center position of the microphones M1 to M5 is the origin to the horizontal angle when viewed from the monitoring camera 12.

In the above embodiment, the camera mounting member 14 is rotated with respect to the frame 15. However, when the frame 15 is small, the frame 15 is not rotated when the camera mounting member 14 is rotated. The surveillance camera 12 may enter the field of view, making it difficult to see the video.
Therefore, as shown in FIG. 5, the camera mounting member 14 is rotated together with the frame 15 with respect to the frame support 19 which is a fixed member using the first stepping motor 16A, and the second stepping motor 16B is rotated. If the sound sampling unit 11 is rotated by the same angle in the opposite direction to the frame 15, the frame 15 will not enter the field of view of the monitoring camera 12 even if the frame 15 is made smaller. Needless to say, the rotation axis of the second stepping motor 16B and the rotation axis of the first stepping motor 16A are collinear.
In this configuration, the number of stepping motors is one more than that of the configuration of FIG. If there is no problem even if the frame 15 is present in the video, it is preferable to use the configuration of FIG.

Moreover, in the said example, although microphone M1-M5 was installed in the top plate 15c of the frame 15, you may install in the side 15b.
In the above example, the estimated horizontal angle θ and elevation angle φ are coordinate-transformed to obtain the horizontal angle θ ′ and elevation angle φ ′. However, when the sound source 50 is far, the estimated horizontal angle θ and elevation angle φ are calculated. May be used as the coordinates of the sound source.
In the above example, the monitoring camera 12 is rotated only in the horizontal angle direction. However, a stepping motor may be added to rotate both in the horizontal angle direction and the elevation angle direction. As a result, a clearer image in the sound source estimation direction can be taken.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  As described above, according to the present invention, it is possible to provide a monitoring camera device with a sound source direction estimating function capable of directly and reliably shooting a video in which the direction of a sound source is displayed. Performance can be improved dramatically.

10 surveillance camera device with sound source direction estimation function, 11 sound sampling unit,
11D fixed base, 12 surveillance camera, 13 transparent display, 13m display surface,
14 camera mounting member, 14a camera support member, 14b display support member,
14c connecting member, 15 frame, 15a bottom plate, 15b side plate, 15c top plate,
16 stepping motors, 17 motor control means, 20 arithmetic units,
21 amplifier, 22 A / D converter, 23 storage means, 24 sound source direction estimation means,
25 coordinate conversion means, 26 rotation determination means, 27 display control means,
50 sound source, M1-M5 microphone, k lens optical axis.

Claims (4)

A plurality of microphones for collecting information of sound propagated from the sound source;
A microphone mounting member for mounting the plurality of microphones;
A surveillance camera that captures indoor or outdoor video,
A transparent display that is transparent in a non-display state;
A camera mounting member for mounting the surveillance camera and the transparent display so that the transparent display is positioned in front of the lens of the surveillance camera;
Sound source direction estimating means for estimating a sound source direction using a sound pressure signal output from each microphone;
Camera rotating means for rotating the camera mounting member,
The camera rotating means rotates the camera mounting member based on the estimated sound source direction so that the shooting direction of the surveillance camera becomes the estimated sound source direction,
The surveillance camera device with a sound source direction estimating function, wherein the transparent display displays a graphic indicating the estimated sound source direction.   The monitoring camera device with a sound source direction estimating function according to claim 1, wherein the camera attachment member is attached to the microphone attachment member via the camera rotation means. The microphone attachment member is attached to the camera attachment member via a microphone rotation means,
2. The sound source direction estimating function according to claim 1, wherein the microphone rotating unit rotates the microphone mounting member in a direction opposite to the camera mounting member and by the same angle as the camera mounting member. Surveillance camera device. The plurality of microphones are:
First to fourth microphones constituting two pairs of microphones arranged at predetermined intervals on two straight lines intersecting each other, and a fifth microphone not on a plane formed by the two pairs of microphones Have
The sound source direction estimating means includes
The ratio of the phase difference between the microphones constituting the two pairs of microphones, and the four pairs of microphones constituted by the fifth microphone and the four microphones constituting the two pairs of microphones, respectively. 4. The surveillance camera device with a sound source direction estimating function according to claim 1, wherein a horizontal angle and an elevation angle of the sound source direction are estimated using a phase difference between the microphones constituting the microphone.

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