JPH1123363A - Sound source separating apparatus with automatic frequency analyzing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a frequency analysis result of a sound source or vibration source separated at a measurement spot in a short time by adding an apparatus for storing data necessary for the frequency analysis inside an apparatus and automatically analyzing a frequency by a control apparatus. SOLUTION: A count of frequencies and a frequency band necessary for a control apparatus 6 are preliminarily set, whereby a necessary frequency band information is designated for a contribution rate-analyzing apparatus 4 and a signal information stored in a memory apparatus 5 is sent to the contribution rate-analyzing apparatus 4. The contribution rate-analyzing apparatus 4 analyzes a contribution rate at each sensor 2a-2c at the designated frequency band from an information signal of noises or vibrations of the apparatus 1 obtained at the sensor 2a-2c and a noise signal obtained by a microphone 3 at an evaluation point. After the analysis, the control apparatus 6 designates a next necessary frequency band to the contribution rate- analyzing apparatus 4, sends the signal stored in the memory apparatus 5 to the analyzing apparatus 4, and analyzes the contribution rate of each sensor 2a-2c at the designated frequency band again. The process is repeated for a count of necessary frequency bands, when the frequency analysis is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a power plant, a chemical plant, a production line of a factory, and the like, in which a large number of devices serving as sound sources are installed. The present invention relates to a method and an apparatus for measuring and analyzing the degree of influence of each device on site.

[0002]

2. Description of the Related Art Hitherto, there has been proposed a method of diagnosing the contribution of a sound source / vibration source for examining the degree of influence of the sound source / vibration source in measuring noise / vibration of equipment and facilities. Examples of such proposals include:
JP-A-5-26722 can be mentioned. This is a general mechanical device
It can be applied to fields such as automobiles, building structures, office automation equipment, and railways.

[0003]

In the apparatus according to the present invention, since there is no storage device in the apparatus, a result can be obtained in real time for a specific or arbitrary frequency band, but all frequency analysis is performed. In order to do so, it was necessary to temporarily record the measurement data in a recording device, reproduce the required number of frequencies, and perform frequency analysis. For this reason, there has been a problem that the frequency characteristics of the sound source or the vibration source separated at the measurement site cannot be immediately confirmed.

[0004]

In order to achieve the above object, the present invention adds a device for storing data required for frequency analysis inside the device, and performs a frequency analysis automatically by a control device. did.

According to the present invention, a frequency analysis result of a separated sound source or vibration source can be automatically obtained.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a diagram showing the overall configuration of a sound source / vibration source influence degree measuring apparatus having an automatic frequency analysis function according to the present invention.

[0008] Sensors 2a, 2b, 2 such as microphones for obtaining information on noise or vibration of a device 1 for generating noise.
c, microphone 3 installed at the evaluation point, and sensor 2
a contribution analysis device 4 for analyzing how much the signals detected by the signals a, 2b and 2c contribute to the microphone 3, a storage device 5 for storing the signals detected by the sensors 2a, 2b and 2c, A control device 6 for controlling the contribution analysis device 4 and the storage device 5 and a display device 7 for displaying analysis results are provided.

In the contribution analysis device 4, the sensors 2a,
The contribution rate of each sensor in an arbitrary frequency band is analyzed based on a signal as information of noise or vibration obtained in 2b and 2c and a noise signal obtained in the microphone 3.
By presetting the number of frequencies and frequency bands required for the control device 6, the frequency band information required for the contribution analysis device 4 is specified, and the signal information stored in the storage device 5 is transmitted to the contribution analysis device 4. Then, the contribution ratio of each sensor in the frequency band designated by the contribution ratio analysis device 4 is analyzed.
When the analysis is completed, the control device 6 designates the next necessary frequency band to the contribution ratio analysis device 4, sends the signal stored in the storage device 5 to the contribution ratio analysis device 4, and returns each sensor in the designated frequency band again. Is performed. This is repeated for the required number of frequency bands to complete the frequency analysis.

The apparatus according to the present invention can further increase the number of sensors and speakers for obtaining noise or vibration information.

(Embodiment 2) An embodiment of the present invention will be described with reference to FIGS. 2, 3 and 4. FIG.

FIG. 2 is a diagram showing a detailed configuration of a sound source / vibration source influence degree measuring apparatus having an automatic frequency analysis function according to the present invention.

Sensors 2a, 2b, 2 such as microphones
The signals obtained from the microphones c and 2d and the evaluation points at the evaluation points are low-pass filter LPFs 11a, 11b and 11
c, 11d, 11e, and A / D converters 12a, 12
Circuits 21a, 21b, 21c, where signals passing through b, 12c, 12d, and 12e enter the storage device from the contribution analysis device.
The data is stored in the storage device 5 through 21d and 21e. The stored signal is passed from a storage device to a contribution analysis device circuit 22.
The contribution ratio analysis is performed by the arithmetic circuit 14 through the adaptive filters ADF 13a, 13b, 13c, 13d through a, 22b, 22c, 22d, 22e. Storage device 5 and connection circuits 21a, 21b, 21c, 21d, 21e, 22
a, 22b, 22c, 22d and 22e are sensors 2a, 2b, 2c and 2d such as microphones and the microphone 3 of the evaluation point, and the low-pass filters LPF11a and 11
b, 11c, 11d, 11e, or low-pass filters LPA 11a, 11b, 11c, 11d, 11e and A / D converters 12a, 12b, 12c, 12d, 12e.
Can be provided between them.

FIG. 3 shows a flowchart of the data processing. As shown in FIG. 3, the fetched data is stored in the storage device, the contribution ratio analysis is performed for each frequency by the number of frequency bands set in advance, and the analysis result is displayed on the display device.

FIG. 4 shows a calculation flow of data analysis. As shown in FIG. 4, the stored data is the lower limit value 31a, 31b, 31c, 3 of the preset frequency.
1d, 31e and upper limit values 32a, 32b, 32 of frequencies
Frequency bands 33a, 33 indicated by c, 32d, 32e
b, 33c, 33d, and 33e.

[0016]

By using the apparatus according to the present invention, it is possible to analyze the frequency of the separated sound source or vibration source at the measurement site in a short time.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an apparatus according to the present invention.

FIG. 2 is a detailed configuration diagram of FIG. 1;

FIG. 3 is a flowchart showing a data processing flow.

FIG. 4 is a diagram for explaining data analysis.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Noise generating device, 2a, 2b, 2c, 2d ... Sensor, 3 ... Microphone (evaluation point), 4 ... Contribution analysis device, 5 ... Storage device, 6 ... Control device, 7 ... Display device, 1
1a, 11b, 11c, 11d, 11e... Low-pass filter LPF, 12a, 12b, 12c, 12d, 12e
... A / D converters, 13a, 13b, 13c, 13d ... Adaptive filter ADF, 14 ... Calculation circuits, 21a, 21b, 2
1c, 21d, 21e, 22a, 22b, 22c, 22
d, 22e connection circuit, 31a, 31b, 31c, 31
d, 31e: lower limit value, 32a, 32b, 32c, 32
d, 32e ... upper limit value, 33a, 33b, 33c, 33
d, 33e: frequency band.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasushi Takano 502, Kandachicho, Tsuchiura-shi, Ibaraki Pref.

Claims (3)

[Claims] An apparatus for analyzing the degree of influence of one or more sound sources or vibration sources on sound or vibration at an evaluation point has a function of automatically performing frequency analysis of each of the sound sources or vibration sources. Sound source separation device with automatic frequency analysis function. 2. An apparatus for analyzing the degree of influence of one or a plurality of sound sources or vibration sources on sound or vibration at an evaluation point, wherein the control for controlling a device for performing frequency analysis of each of the sound sources or vibration sources is performed. Sound source separator with automatic frequency analysis function. 3. An apparatus for analyzing the degree of influence of one or a plurality of sound sources or vibration sources on sound or vibration at an evaluation point, a sound source with an automatic frequency analysis function having a storage function of storing data to be analyzed. Separation device.