JPH04290930A - Device for visualizing acoustic and vibrational information - Google Patents

Abstract

PURPOSE:To simultaneously display on a screen different pieces of information including the frequency and magnitude of acoustic intensity or vibration and also the space and time (secular change). CONSTITUTION:The frequency and/or magnitude of acoustic intensity measured by a microphone 1 are analyzed by an intensity analyzer 6 of an analytical processing device 2, and image processing data is prepared by an image processing part 7 so that the frequency and magnitude information at each measuring point in the space is displayed by color and lightness, wherein it is also be capable of indicating the information about secular change in the form of animation through changing-over of the screen. On the basis of the image processing data, the frequency and magnitude information in the acoustic intensity space is displayed by color and lightness in an image information display device 3, and the information about the time (secular change) is indicated animationally upon changing-over of the screen. Thus the different pieces of information are turned visible and displayed in the form of animation, which permits evaluating noise, etc., intuitionally and objectively.

Description

[Detailed description of the invention]

[Object of the invention]

0002

[Field of Industrial Application] The present invention relates to an acoustic and vibration information visualization device that measures the acoustic intensity of a sound source or the vibration of a vibration source and visualizes and displays the frequency and magnitude thereof. The present invention relates to a sound and vibration information visualization device that simultaneously visualizes and displays information on sound intensity or vibration frequency, magnitude, and change over time at a measurement point.

0003

[Background Art] When measuring sound intensity to analyze noise, etc., conventionally, if the noise source fluctuates over time, time averaging is performed, and the size of a specified frequency band is plotted as a contour. etc. was displayed. FIG. 6 is a contour diagram representing the spatial distribution of the magnitude of a certain center frequency in a 1/3 octave band. In the figure, M1, M2
is a noise source.

[0004] In this case, instantaneous time information at any given time is lost due to time averaging, and frequency information is fixed to one band and frequency information of other bands is not displayed.

[0005] Furthermore, when short-time spectra are calculated and stored using Fourier transform, Wigner distribution, maximum entropy method, etc., acoustic intensity can be expressed in terms of frequency, time, and magnitude, as shown in FIG. 7, for example. , spatial information as shown in FIG. 6 is not expressed.

FIG. 8 shows noise acoustic information (frequency, time,
FIG. In this figure, the direction away from the origin on the frequency axis corresponds to the frequency resolution width, the direction away from the origin on the time axis corresponds to the averaging time, and the direction away from the origin on the spatial axis corresponds to the spatial average area of the noise emission surface. Equivalent to.

[0007] In this way, as noise moves away from the origin, each piece of information (frequency, time, space) is averaged and the amount of information decreases, and the closer to the origin, each piece of information (frequency, time, space) becomes finer. The amount of information increases.

[0008]

[Problem to be solved by the invention] By the way, in order to investigate the principle of noise generation, etc., it is necessary to obtain more detailed information (frequency, loudness,
However, in the past, as shown in Fig. 6, only the spatial information of the magnitude of the sound intensity at a certain time, or as shown in Fig. 7, the frequency of the sound intensity, Although it was possible to display only size and time information, it was not possible to visualize and display each of these pieces of information (frequency, size, time, space) at the same time, so it was difficult to intuitively evaluate noise etc. It was not possible to do so objectively and objectively. Similar problems also occur when evaluating vibrations.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a sound and vibration visualization device that can simultaneously display information on the frequency, magnitude, time, and space of sound intensity or vibration. It is something to do.

[Configuration of the invention]

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a measurement means for measuring the acoustic intensity of a sound source or vibration of a vibration source, and a spatial measurement method using measurement information inputted from the measurement means. Analyze the frequency and magnitude of the sound intensity or vibration at any measurement point, and expand the information on the frequency and magnitude of the sound intensity or vibration at the measurement point on a two-dimensional plane by either color or brightness. processing means for generating image processing data so as to be displayed in an area corresponding to the measurement point in the space where the measurement is performed, and to display information on changes over time in frequency and size at the measurement point as a moving image by switching screens. Then, based on the image processing data input from the processing means, the acoustic intensity or the frequency and magnitude of vibration are determined by either color or brightness in the area corresponding to the measurement point in the space developed on a two-dimensional plane. The present invention is characterized by comprising display means for displaying changes over time in frequency and magnitude at the measurement point as a moving image by switching screens.

0012

[Operation] According to the present invention, the frequency and magnitude at a measurement point in a space of sound intensity and vibration can be expressed by color and brightness, and changes over time can be displayed as a moving image, so the state of noise and vibration can be displayed. It can be visually perceived intuitively.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on an embodiment shown in the drawings.

FIG. 1 shows an acoustic information visualization device according to this embodiment, which includes a microphone 1, an analysis processing device 2, and a CR
It is composed of an image information display device 3 such as T.

The microphone 1 is placed at a predetermined measurement point in a space in which a noise source (not shown) such as a rotating machine that generates regular noise is installed. Although the space in which the noise source is installed is three-dimensional, it can be expanded into a two-dimensional plane as shown in Figure 2, so each measurement point in the space 4 where the microphone 1 is installed is Each divided area above 5
In this embodiment, the microphone 1 is disposed in an arbitrary region 5 and the sound intensity in that region 5 is measured, and the sound intensity is sequentially measured in all regions 5 in the same manner. Furthermore, the acoustic intensity of the space can be measured simultaneously by disposing the microphones 1 in each of the areas 5.

The analysis processing device 2 is composed of an intensity analyzer 6 and an image processing section 7, and the intensity analyzer 6 calculates the frequency and magnitude of sound intensity based on measurement information input from the microphone 1. The image processing unit 7 performs image processing based on the analysis information input from the intensity analyzer 6, and converts each information of the frequency and magnitude of the sound intensity at a measurement point in the space at an arbitrary time into an image. It is converted into a signal and output to the image information display device 3 (details will be described later).

The acoustic information visualization device according to this embodiment is configured as described above, and the microphone 1 measures the acoustic intensity of the noise source at any time at each measurement point, and the intensity analyzer 6 measures the frequency. and size analysis. The frequency and magnitude analysis information obtained by the intensity analyzer 6 is input to the image processing section 7. The image processing unit 7 calculates the frequency of the sound intensity at the measurement point by color change, the size by brightness (brightness), and the measurement points in the space 4 by each region 5 divided into a two-dimensional plane in a checkerboard shape (Fig. 2 ), image processing data is generated that displays changes over time (time) as moving images by switching screens (space developed on a two-dimensional plane) (details will be described later). The image information display device 3 displays acoustic intensity information of noise as shown in FIG. 3, for example, based on the image signal output from the image processing section 7.

The spatial information of the measurement point displayed on the image information display device 3 can be developed on a two-dimensional plane even if the measurement point is three-dimensional as described above, so it can be expressed one-to-one in two-dimensional coordinates. Compatible.

[0019] The frequency information of the acoustic intensity of the measurement point displayed on the image information display device 3 allows each area 5 indicating the measurement point in the space 4 developed on a two-dimensional plane to be divided according to the measured frequency. Represented by different colors. At this time, the noise spectrum is not necessarily a single frequency as shown in Figure 4, so if multiple spectra exist, specify the lower limit frequency fmin and upper limit frequency fmax as shown in Figure 5. The frequency f0 with the largest magnitude is selected from among the spectra in that section, and the frequency f0 is represented in a predetermined color. In addition, the colors to be displayed may be adjusted, for example, by adjusting warm colors to higher frequencies and adjusting cool colors to lower frequencies, in accordance with human senses. That is, the longer wavelength of light is matched to the higher frequency.

[0020] Information about the magnitude of the acoustic intensity at a measurement point displayed on the image information display device 3 is expressed by the brightness of the color, that is, the brightness. For example, the side with higher acoustic intensity is made brighter, and the side with lower acoustic intensity is made darker.

[0021] Changes over time (time information) in the frequency and magnitude of sound intensity in a space (measurement point) displayed on the image information display device 3 are displayed as a moving image by switching the display screen at predetermined time intervals.

In this way, as shown in FIG. 3, the image information display device 3 first displays the spatial information, frequency information, and magnitude information of the sound intensity at time t1, and then sequentially displays the sound intensity information at times t2, t3, and so on. The screen changes to display moment by moment sound intensity information.

In this figure, the darkest part A in area 5 of space 4 (shown in black in FIG. 3, but displayed brightest on the actual screen as described above) is the noise source;
The shaded area B in the surrounding area 5 indicates that the acoustic intensity is greater than the white area C in the outer area 5. Note that although color-coded frequency information is not shown in this figure, color-coded frequency information is also shown on the screen of the actual image information display device 3.

Furthermore, the screen switching speed of the time (change over time) information by the image information display device 3 need not be made to correspond to the true time of the phenomenon, but may be adjusted to a speed at which changes can be seen.

Furthermore, in the above-described embodiment, the image information display device 3 displays the frequency of the sound intensity in color and the magnitude in brightness, but it is also possible to display the frequency in brightness and the magnitude in color. good.

Furthermore, although the above-described embodiment was a case of visualizing the acoustic intensity of a noise source, by using a vibration sensor (acceleration sensor) etc. in place of the microphone 1, it is also possible to visualize vibrations in the same manner as described above. Can be applied.

[0027]

[Effects of the Invention] As described above in detail based on the embodiments, according to the present invention, each information such as frequency and size in the space of sound intensity and vibration, which cannot be captured visually, can be Because it can be visualized and displayed as a video according to time (change over time) information,
Noise and vibration evaluation can be performed intuitively and objectively.

[0028]

[Detailed explanation of drawings]

[0029]

FIG. 1 is a schematic configuration diagram showing an acoustic information visualization device according to an embodiment of the present invention.

[0030]

FIG. 2 is an explanatory diagram showing a space developed on a two-dimensional plane.

[0031]

FIG. 3 is an explanatory diagram showing an example of information regarding space, frequency, magnitude, and time of acoustic intensity displayed on an image information display device.

[0032]

FIG. 4 shows a noise consisting of a single frequency spectrum.

[0033]

FIG. 5 is a diagram showing noise consisting of multiple frequency spectra.

[0034]

FIG. 6 is a diagram showing the spatial distribution of the size of a frequency band with sound intensity displayed by a conventional audio information visualization device.

[0035]

FIG. 7 is a diagram showing the relationship between frequency, magnitude, and time of acoustic intensity displayed by a conventional acoustic information visualization device.

[0036]

FIG. 8 is a diagram showing acoustic information of noise.

[0037]

[Explanation of symbols]

1. Microphone (measurement means) 2 Analysis processing device (processing means) 3 Image information display device (display means) 4 Space 5 Area 6 Intensity analyzer 7 Image processing section

Claims (2)

[Claims] 1. A measuring means for measuring the acoustic intensity of a sound source or the vibration of a vibration source, and the frequency and magnitude of the acoustic intensity or vibration at an arbitrary measurement point in space based on measurement information input from the measuring means. is analyzed, and information on the acoustic intensity or vibration frequency and magnitude at the measurement point is displayed in an area corresponding to the measurement point in a space developed on a two-dimensional plane by either color or brightness. , processing means for generating image processing data that displays information on changes in frequency and magnitude over time at the measurement point as a moving image by switching the screen; The frequency and size of the intensity or vibration are displayed in the area corresponding to the measurement point in a space developed on a two-dimensional plane by either color or brightness, and the changes over time in the frequency and size at the measurement point are displayed. What is claimed is: 1. A visualization device for acoustic and vibration information, comprising a display means for displaying a moving image by switching screens. 2. The acoustic intensity or vibration frequency information displayed on the display means is a frequency having a maximum magnitude within a specified arbitrary frequency range. Visualization device for acoustic and vibration information.