JPH0462049B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention visualizes and displays an object image of a sound source object and information regarding the sound pressure distribution such as noise generated from this sound source object as a sound image. The present invention relates to a two-image superposition display device that displays two images superimposed.

[Background Art] For example, in order to reduce noise in machinery, factories, etc., it is necessary to accurately understand the source of the noise. Acoustic holography methods are known to detect the position and size of this noise source, but this acoustic holography method uses a large-scale microphone sweep device and complicated arithmetic processing equipment. However, there are drawbacks such as the need for a large amount of time to perform the calculation processing.

[Problems to be Solved by the Invention] Therefore, the inventor has proposed a method that can easily detect the sound source position and sound pressure distribution by using a sound collector. In order to search for this sound source, a concave spherical sound collector forming an acoustic lens is placed facing the sound source, and by collecting sound with this sound collector, an image of the sound source is formed. This is what I did. If a sound image forming means such as a microphone array is disposed at this sound image forming position, the sound image forming means can convert the sound into an electrical signal corresponding to the sound pressure level at the sound source. This makes it possible to easily obtain sound pressure distribution information such as noise generated from a sound source object, and it also has various advantages such as being able to sample changes in sound pressure in real time and display them dynamically. There is.

However, this information regarding the sound image is acquired independently and separated from the object image of the sound source object. Therefore, accurate sound source detection cannot be performed unless the information regarding the sound image and the information regarding the object image are compared using some method. In addition, in order to compare the sound image and the object image, a method of displaying these two images in parallel can be considered, but it is difficult to make the two correspond in detail, and it is troublesome to compare the two. There are problems such as: On the other hand, these 2
It is also possible to display images in a superimposed manner. However, in order to superimpose these two images, the device that acquires the sound image requires a signal processing device that processes the electrical signals that make up the sound image, and in addition, the device that captures the object image and the device that processes these two images are required. It requires a device to superimpose the images and a device to display the superimposed image, but if these devices were to be provided separately, the device configuration would be extremely complex and large, and noise would be generated. There are drawbacks, such as the difficulty of bringing it to the site where the equipment is being used.

The present invention has been made in view of the above points, and it is possible to display a sound image and an object image by accurately superimposing them using an extremely simple, small and compact device configuration. An object of the present invention is to provide a two-image superimposed display device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an object image forming means for forming an object image on a sound source object and an image on an imaging section via an optical system, and A sound image display means configured by arranging light emitting elements such as light emitting diodes and liquid crystals in a matrix to convert sound pressure distribution information on an object into light intensity distribution information and display it as a sound image, a sound image imaging lens, and a half mirror. ,
The present invention is characterized by comprising an image superimposing means for displaying the sound image on the imaging section so as to be superimposed on the object image so that the sound image has the same magnification as the object image.

[Operation] An object image of the observation target area can be easily photographed by an object image forming means consisting of a normal optical photographing means such as a photographic camera. Further, a sound image can be obtained by, for example, providing a sound collector and a means for converting the sound image into an electrical signal, such as a microphone array, at the sound image forming position of the sound collector.

Therefore, as mentioned above, the signal related to the sound image acquired as an electrical signal is transmitted to the sound image display means,
Information regarding this sound pressure distribution is converted into light amount distribution information as a light amount signal of the light emitting elements arranged in a matrix. With this, the sound image can be displayed as optically recognizable light amount distribution information using a simple method. The sound image thus converted into optically recognizable information is then acquired separately and superimposed on an object image acquired by ordinary optical means. For this purpose, image superimposition means consisting of a sound image forming lens and a half mirror is provided. Here, either the sound image or the object image can be reflected by a half mirror, and the other image can be transmitted through the half mirror and superimposed on the imaging section of the object image imaging means. When there is a difference in magnification between the two images described above, the imaging magnification of the sound image may be adjusted using the sound image forming lens.

In this way, by superimposing the sound image on the object image at the same magnification, the position of the sound source and its sound pressure distribution can be superimposed on the object image and displayed accurately.

Therefore, it is possible to easily and extremely downsize a photographic camera, which is generally used to form an object image, by adding an audio image display means in which light emitting elements are arranged in a matrix, a lens, and a half mirror.
Due to the compact construction, a two-image superimposed display device can be formed.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, as shown in FIG. 1, an object image of a sound source object 1 as a sound source object is formed and displayed on an imaging device 2 consisting of a photographic camera or the like. On the other hand, in order to obtain a sound image, a reflective sound collector 3 having a concavely curved reflective surface is disposed facing the sound source object 1 . By making the sound collector 3 act as an acoustic lens, the sound image of the sound source object 1 is formed in front of its reflecting surface. At the position where this sound image is formed, a microphone array 4 in which a large number of microphones are arranged side by side in a matrix as a sound image acquisition means is provided facing the reflective surface of the sound collector 3. The reflected sound from the sound source object 1 can be received by each microphone in the microphone, and a voltage signal corresponding to each sound pressure can be outputted. Further, the object image imaging means 2 is integrally provided with a sound image display means 5, and the output signal from the aforementioned microphone array 4 is amplified by an amplifier 6, and based on this amplified signal, the sound image display means 5 is By converting the sound pressure distribution of generated noise and the like into light amount distribution information, it is formed into an optically recognizable sound image and displayed. Then, this sound image is formed by the imaging means 2
The image is guided by the sound source object 1 and is displayed superimposed on the object image of the sound source object 1.

Next, FIG. 2 shows a cross section of a two-image superimposing device comprising the object image forming means 2 described above and the sound image display means 5 provided integrally therewith.

As shown in the figure, the object image forming means 2 is provided with an optical system 11 formed by combining a plurality of lenses on the front surface of a main body 10 and supported by a lens barrel 12.
In addition, the main body 10 includes a half mirror 13 as an image superimposing means that is aligned with respect to the optical axis of the optical system 11 by operating the main body 10. It is installed at a 45° angle.
The transmission and reflection ratios of the half mirror 13 are selected appropriately depending on the observation conditions. Therefore, sound source object 1
The object image is guided into the main body 10 via the optical system 11, but in order to adjust the amount of light incident on the main body 10, the lens barrel 12 is provided with an aperture 14.
is provided. Further, a focus plate 15 as an imaging unit is installed on the upper lid of the main body 10, and the object light from the sound source object 1 is split by a half mirror 13, and the reflected light is reflected on the focus plate 15.
The image is displayed on the top, and when the lid piece 16 covering the top of the focus plate 15 is opened, this image can be seen from the outside. Further, a darkroom 17 is connected to the rear part of the main body 10,
The darkroom 17 and the inside of the main body 10 are defined by a shutter 18. A film 19 is mounted inside the darkroom 17, and when the shutter 18 is opened, the film 19 is exposed to object light passing through the half mirror 13. It is becoming exposed.

Next, the sound image display means 5 consists of a light emitting diode array 21 disposed in a housing 20 connected to the bottom of the main body 10 of the object image forming means 2, and this light emitting diode array 21 is connected to the above-mentioned detection device. The microphone array 4 includes a large number of light emitting diodes arranged in parallel so as to correspond to each microphone constituting the microphone array 4. Each of these light emitting diodes is connected to a microphone and is turned on with an amount of light corresponding to the sound pressure of the sound source object 1 received by each microphone, and this can be optically recognized as the distribution of light in the light emitting diode array 21. It is visualized and displayed as a sound image.

A mask plate 22 is attached above the light emitting diode array 21, and the microphone plate 22 has a large number of through holes 23 through which light from each light emitting diode of the light emitting diode array 21 passes. This prevents the lights from the light emitting diodes constituting the light emitting diode array 21 from influencing each other, making it possible to clearly display the sound image. A filter 24 is further removably provided in the housing 20, and by diffusely reflecting the light image from the light emitting diode array 21, the light image as a sound image is spread out in a plane. It is now possible to grant This is used as necessary depending on the type and content of the observation element. Furthermore, this sound image is transferred to the sound image forming lens 2.
5 and an aperture 26 into the main body 10 from an opening 27 formed at the bottom of the main body 10, and is divided by a half mirror 13 so that a portion of the image is displayed on the focus plate 15 at the same magnification as the object image. In addition to displaying the object image, when the shutter 18 is opened, it is possible to photograph the object image superimposed on the film 19.

Note that the same magnification as the object image can be achieved by adjusting the distance relationship between the object, the object image imaging means, and the sound collector. For example, when the distance between the sound source object 1 and the object image forming means 2 is set to a predetermined distance, the sound collector 3 and the object image forming means 2 are always held in a constant positional relationship, The combined focal length of the sound image S shown on the light emitting diode 21 obtained by the sound collected by the microphone array 4 collected by the microphone array 4 and the sound image forming lens 25 is determined by the optical system 11 of the object image forming means 2. The focal length may be set to be the same as the focal length in . In addition, in order to improve the resolution of the sound image, the microphones constituting the microphone array 4 and the light emitting diode array 21
The number of light emitting diodes arranged per unit area may be increased.

By using the two-image superposition device configured as described above, it is possible to easily and accurately detect and measure what sound pressure level noise is generated in which part of the sound source object 1. .

That is, as shown in FIG.
By keeping the positional relationship of the sound collector 3 constant and installing it so that it faces the sound source object 1 and is at a predetermined distance from the sound source object, the focus of the object image and the sound image coincide. Here, in order to display the two images at the distance within the predetermined range as equal magnification in the two-image superimposing device set in the distance relationship as described above, first, the object image in the object image imaging means 2 is focused. This can be done by operating the lens barrel 12 as in a normal camera, or by attaching a zoom lens or the like to the lens barrel 12 if necessary. On the other hand, the focus of the sound image is determined by the microphone array 4 that constitutes the detection device.
This is done by installing the sound collector 3 at the position where the sound image of the reflected sound is formed. That is, this is performed by moving the microphone array 4 in the direction toward or away from the reflective surface of the sound collector 3 in accordance with the moving distance accompanying the focusing of the object image forming means 2. Therefore, by configuring the object image and the sound image to be focused in conjunction with each other, by focusing on one, the other can be automatically focused. In this case, the object image forming means 2
It goes without saying that it is possible to focus the sound image first, and then focus the object image according to the distance traveled. Nor.

The object image is guided into the main body 10 via the optical system 11, reflected by the half mirror 13, and displayed as an image on the focus plate 15. In addition, the sound pressure distribution of the sound source object 1 is detected as a sound image by having the microphone array 4 that constitutes the detection device receive the sound, and this is converted into a voltage signal and the output signal is sent to the amplifier 6. By amplifying this signal and inputting it to the light emitting diode array 21, each light emitting diode of the light emitting diode array 21 installed in a state corresponding to each microphone in the aforementioned microphone array 4 is caused to emit light. In this way, the sound pressure distribution of the sound source object 1 is displayed as an optically recognizable image of the light emitted from the light emitting diode array 21.
The sound image thus displayed travels through the sound image forming lens 25 into the main body 10 toward the half mirror 13, and the light that has passed through the half mirror 13 overlaps with the object image on the focus plate 15. The position of the sound source in the sound source object 1 can be searched and measured. Moreover, by opening the shutter 18 of the object image imaging means 2, this sound image,
A superimposed image of two object images can be photographed and recorded on the film 19.

This two-image superimposition device is extremely simple and compact, simply by attaching a light emitting diode array 21 and a sound image forming lens 25 to a photographic camera, and further providing a half mirror 13 within the main body 10. Since it can be formed easily, it can be easily transported to the site where the noise is occurring, and the sound source detection work can be carried out smoothly.

[Effects of the Invention] As detailed above, the two-image superposition device according to the present invention uses an object image forming means such as a general photographic camera to form an object image of a sound source object by a normal optical method. At the same time, the sound pressure distribution information on the sound source object is directly transformed into optically recognizable light amount distribution information by a sound image display means formed by arranging light emitting elements such as light emitting diodes and liquid crystals in a matrix. The object image and the sound image are converted and displayed as a sound image, and these two images, the object image and the sound image, are superimposed by an image superimposing means, so that a photographic camera generally used for forming an object image can be used. In addition, it is possible to form a two-image superimposed display device that is simple, extremely small, and compact by simply adding a sound image display means in which light-emitting elements are arranged in a matrix, a lens, and a half mirror. This brings about various effects such as being able to smoothly and easily carry out sound source exploration to obtain information regarding the position of the noise and its sound pressure distribution in the sound source object by bringing it to the site where the noise is generated.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing the overall configuration of a sound source exploration/measurement device using a two-image superposition device of the present invention;
FIG. 2 is a sectional view of the two-image superimposing device. 1... Sound source object, 2... Object image forming means, 4...
...Microphone array, 6...Sound image display means, 11...
Optical system, 13...half mirror, 15...focal plate, 19...film, 21...light emitting diode array, 25...lens for sound image formation.

Claims (1)

[Claims] 1. Object image imaging means for forming an object image on a sound source object on an imaging section via an optical system, and a light emitting diode and a liquid crystal that convert sound pressure distribution information on this sound source object into light intensity distribution information and displaying it as a sound image. a sound image display means formed by arranging light emitting elements such as in a matrix, a sound image imaging lens, and a half mirror, and the sound image is displayed at the imaging section so that the sound image has the same magnification as the object image. and image superimposing means for displaying the object image in a superimposed manner.