JP3283024B2 - Noise measurement management system and recording medium for the system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for measuring noise and processing data obtained thereby. Note that such a system is referred to as a noise measurement management system in this specification.

[0002]

2. Description of the Related Art Environmental standards relating to noise based on the provisions of Article 16, Paragraph 1 of the Basic Environment Law (1998 Environment Agency Notification No. 64,
In the measurement of road noise based on an environmental standard, a noise level (unit: dB) measured by a sound level meter installed at a measurement point is measured for a predetermined time (preferably 24).
Time) measured and recorded, and the equivalent noise level (Le) obtained by processing the recorded noise data by a predetermined method.
q) by comparing it with the reference value determined according to conditions such as day and night, region, road width (number of lanes), etc.
The noise is evaluated.

In calculating the equivalent noise level, sounds generated from sound sources other than vehicles running on the road (birds singing, wind sounds, leaves rubbing sounds, emergency vehicle siren sounds, bicycles trying to avoid noise level meters) Calculation processing is performed excluding data on brake noise, aircraft noise, railway noise, construction work noise, etc.). In this way, in the measurement of road noise, the actual sound of the sound generated during the measurement time at the measurement point is recorded together with the measurement time so that data selection according to the type of sound source can be performed after the measurement. Is common. Then, in the data analysis after the measurement, the analyst listens and confirms the actual sound at the measurement time when the sound of the level equal to or higher than the reference value is generated, identifies the type of the sound source, and uses the data of the sound as data necessary for the calculation It is determined whether or not.

Japanese Patent Laid-Open Publication No. Hei 10-170332 discloses a real sound monitoring system that can be used for noise measurement as described above. In this system, when the noise measurement value obtained by processing the output signal from the sound level meter is equal to or higher than a predetermined reference noise value, the effective noise signal indicating the noise is preliminarily recorded in an internal storage medium (such as an IC memory). Further, when the state in which the noise measurement value is equal to or higher than the reference noise value continues for a predetermined reference time, the pre-recorded effective value noise signal is permanently recorded on an external storage medium (hard disk, magneto-optical disk, etc.) as valid data. Is done. The valid data recorded in the external storage medium can be reproduced through a sound converter (speaker) after the measurement. In addition, in order to enable high-speed time search at the time of analysis after measurement, a time index is given at predetermined time intervals when each effective data is recorded.

[0005]

The above-mentioned actual sound monitoring system is a kind of recording device specially designed for recording sound picked up by a sound level meter. I have no choice. The present invention has been made to solve such a problem, and an object thereof is to automatically record a noise level and a real sound, analyze collected noise data and reproduce a real sound. It is to provide a noise measurement management system that can easily perform the noise measurement.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a sound level meter which outputs a measurement signal indicating a sound level value at a measurement point, and a sound level meter which changes according to the sound pressure at the measurement point. Including a microphone that outputs an audio signal to be output, a first input unit that receives an output signal of the sound level meter, a second input unit that receives an output signal of the microphone, a storage device that stores data, and a central processing unit. A noise measurement management system including a computer system,
Data storage for collecting a measurement signal output from the sound level meter at predetermined time intervals and storing data of a sound level value indicated by the measurement signal in the storage device in association with data of a time at which the measurement signal was collected. A function, a level determination function for determining whether or not the level value is equal to or greater than a predetermined reference value, and, when the level value is equal to or greater than the reference value, collecting an audio signal output from the microphone for a predetermined time; A noise measurement management system having a real sound recording function of storing data indicating a time change of an audio signal in the storage device in association with the level value data.

According to the present invention, a first input unit to which a sound level meter that measures sound and outputs a measurement signal indicating the level value thereof can be connected, and outputs a sound signal that changes according to the surrounding sound pressure. A second input unit to which a microphone can be connected, a storage device for storing data, and a computer including a central processing unit collect measurement signals output from the sound level meter at predetermined time intervals, and indicate the measurement signals. The sound level value data
A procedure for storing the measurement signal in association with the data of the time at which the measurement signal is collected in the storage device, a procedure for determining whether the level value is greater than or equal to a predetermined reference value, and a procedure for determining whether the level value is greater than or equal to the reference value. A program for executing a procedure of collecting an audio signal output from the microphone for a predetermined time and storing data indicating a time change of the audio signal in the storage device in association with the level value data. Provided is a computer-readable recording medium.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The noise measurement management system according to the present invention has a function of collecting and storing noise level data in an existing personal computer by running a predetermined program on the personal computer. And a function of recording a real sound when the noise level is equal to or higher than a predetermined reference value. Such a system according to the present invention can be realized at a low cost as compared with a dedicated hardware device particularly configured for noise measurement, and can be implemented with the same hardware configuration by modifying a program or adding a module. Functions can be easily added or improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A noise measurement management system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of the noise measurement management system of the present embodiment. The system 1 includes a personal computer system (hereinafter, referred to as a personal computer) 2, a sound level meter 3, and a microphone 4. The personal computer 2 includes a central control device 10 including a microprocessor and a memory, an input device 11 such as a keyboard and a mouse, a display device 12 such as a CRT and an LCD, an external storage device 13 such as an HDD, an MO, and a DVD-RAM. And a printing device 14 such as a printer. The input device 11, the display device 12, the external storage device 13, and the printing device 14 are each provided with an input / output interface (I /
F) It is connected to the central controller 10 via 15a to 15d. The sound level meter 3 is connected to the central controller 10 via a serial communication interface (serial I / F) 16, and the microphone is connected to the central controller 10 via a voice input interface (voice input I / F) 17.
The personal computer 2 has a commercially available operating system (O
S) is installed in advance. As the sound level meter 3 and the microphone 4, a conventional product generally used for noise measurement is used.

In the system of the present embodiment, first, an operating system (OS) installed in the personal computer 2 is started, and a predetermined program is operated on the OS. Various functional units for performing various controls and processes are configured. These functional units include a management unit 21, a measurement unit 22, a voice recording unit 23, a chart display unit 24, and a clock unit 25.

When the user operates the input device 11 to start the program, the management unit 21 is started, and the management unit 21 displays a management window 30 as shown in FIG. The management window 30 includes “File”, “Measurement”, “Level Recorder”, and “Help”.
A menu bar 31 including four menus,
Two command buttons (calculation start button 32 and data display button 33) are provided. Each menu of the menu bar 31 includes a submenu as shown in FIG. The user can call various functions of the system 1 by appropriately operating the input device 11 and selecting a menu item or clicking a command button. Among these functions, the measurement function will be described first.

When the user selects the “measurement start” submenu of the “measurement” menu on the menu bar 31, the management unit 21 activates the measurement unit 22. The measurement unit 22 displays the measurement window 40 as shown in FIG. 4 on the display device 12 and tests whether communication with the sound level meter 3 can be normally performed through the serial I / F 16. When communication cannot be performed normally, the measurement unit 22 displays an error message notifying the communication abnormality on the display device 12.

The configuration of the measurement window 40 is as follows. First, in the upper part of the measurement window 40, three text boxes 41a to 41c for displaying a measurement start time, a current time, and the number of samples, respectively, and a text box 4 for displaying a measured noise level in numerical values.
2, and a chart panel 43 for displaying the time change of the noise level in the form of a chart diagram are arranged. In the middle part of the measurement window 40, five variables relating to the sound measurement conditions using the sound level meter 3 (measurement range, dynamic characteristics of the sound level meter, sample period, characteristics of weight correction by frequency,
(The number of samples), five sets of radio buttons 44a to 44e are arranged. Measurement window 4
Below 0, a check box 45 and a text box 46 for making settings relating to recording using the microphone 4, and three command buttons 47 to 49 for starting, suspending, and ending measurement are arranged.

The measurement is performed in the following procedure. First,
When the measurement window 40 is displayed as described above, the user appropriately sets / changes the selection state of the radio buttons 44a to 44e. When the user clicks the start button after setting the variables relating to the measurement conditions in this way, data indicating the set measurement conditions and a measurement start instruction command are sent to the measurement unit 22. Upon receiving this data and instructions,
The measurement unit 22 sends a command (variable setting command) for setting an internal variable of the sound level meter 3 to the sound level meter 3 so that the measurement is performed under the conditions indicated by the data, and starts the measurement operation. The transmission of the variable setting command does not necessarily have to be performed in response to the click of the start button. For example, every time the selection state of the radio button changes on the measurement window 40, the variable setting command is transmitted to the sound level meter 3. You may make it transmit.

During the measurement operation, the measurement unit 22 monitors the elapsed time from the start of the measurement based on the timing signal output from the timer unit 25, and issues a sampling command for each sample period set by the radio button 44c. Send to 3.
Upon receiving the sampling command, the sound level meter 3 outputs a signal (measurement signal) indicating the noise level at the time of receiving the command.
Is returned to the measurement unit 22. Upon receiving the measurement signal, the measurement unit 22
Analyzes the signal to calculate the noise level, and stores the data indicating the noise level value in the external storage device 13 in association with the measurement time (for example, the transmission time of the sampling signal) and the data of the sample number. . The operation of saving these measurement data is, for example, an operation of creating a database file as shown in FIG. When the capacity of the memory provided in the central control device 10 is sufficiently large,
First, a database having the above structure may be created on the memory, and after the measurement is completed, the database may be collectively stored in the external storage device 13 in the form of a file. The above-described sampling operation is repeated by the number of samples set by the radio button 44e (the radio button 4e
If "1 day in a row" is selected in 4e, the number of samples = 86
400).

During the measurement operation, the measurement unit 22 sequentially displays the measurement time and the number of samples of the latest noise level data in the text boxes 41b and 41c, and displays a predetermined number of samples (for example, 100
The latest noise level data for each of the above is displayed in the form of a chart.

In order to monitor and record the actual sound in addition to the measurement of the noise level, the following is performed. First, in a preparation stage before clicking the start button, the user sets the measurement conditions as described above, and inputs a noise level threshold used as a criterion for determining whether or not to record in the text box 46. Check box 45 is turned on. When the measurement is started in this way, the measuring unit 2
2 displays and records the measured noise level as described above, and determines whether the noise level is equal to or higher than a threshold. When the noise level is equal to or higher than the threshold, the measurement unit 22 sends a recording start command to the voice recording unit 23,
The elapsed time from the start of recording is monitored based on the output signal of the timer unit 25. Voice recording unit 2 receiving recording start command
3 converts an audio signal transmitted from the microphone 4 via the audio input I / F 17 into audio data, and associates the data with the noise level data in the external storage device 13.
To a file (this corresponds to the recording operation). As a method of associating the noise level data with the audio data, for example, a method of embedding a character string indicating the measurement time or a character string of the sample number of the noise level data in the file name of the audio data may be mentioned. When the elapsed time from the start of recording reaches a predetermined time, the measuring unit 22 sends a recording end command to the voice recording unit 23. The predetermined time is set as short as possible (for example, about 4 seconds) as long as the sound source of the recorded sound can be identified. The audio data stored in the external storage device 13 as described above can be easily reproduced using the audio data reproduction function available through the OS installed in the personal computer 2.

The system 1 of this embodiment is provided with various functions relating to processing of data obtained by measurement and recording. These functions include, for example, a file input function, a file output function, a data display / print function, a calculation function, a chart display / print function, and the like. All of these functions are called from the management window 30.

When the user selects the “Open” submenu of the “File” menu on the menu bar, the management unit 21
Displays a file selection dialog box (not shown) on the display device 12. When the user selects the target measurement data file in this dialog box, the management unit 2
1 reads the file and displays the contents of the measurement data in the management window 30. Specifically, the management unit 21
Extracts the information relating to the measurement conditions from the file and displays it in the text area 34, extracts the data of the sample numbers 1 to 100, and displays them in the list box 35. When the user inputs the sample number of the target data in the text box 36 above the list box 35 and clicks the data display button 33, the management unit 21 stores the 100 data starting from the sample number. It is displayed in the list box 35.

When the user clicks the calculation start button 32 while the data is read as described above, the management unit 21 determines the equivalent noise level (Leq) and the time rate noise level (Leq) for all the noise level data. L95, L90, etc.),
Single noise exposure level (LAE), maximum noise level (MA
X) and the minimum value (MIN) are calculated, and the calculation result is displayed in the text area 37. The text area 37
In the text box 38 above, the number of data that has been processed is displayed. For example, although it takes a long time to perform calculation processing on data obtained by continuous one-day measurement, the user can confirm that the calculation processing is normally proceeding by observing a change in the display of the text box 38. You can check.

When the user selects the “Print” submenu of the “File” menu while the data is read as described above, the management unit 21 uses the printing device 14 to list the measured data in a list format. Print. The data to be printed includes not only all sampled data but also information on measurement conditions, calculation results, and the like.

When the user selects the "chart" submenu of the "level recorder" menu with the data read as described above, the management unit 21 sends a display command to the chart display unit 24, In response, the chart display unit 24 displays a chart window 50 as shown in FIG. Chart window 5
0 is provided with a chart panel 51 on which a chart diagram drawn by a general level recorder is drawn. On the chart panel 51, the horizontal axis corresponds to time (hours, minutes, and seconds), and the vertical axis corresponds to noise levels (dB). Below the chart panel 51 are two sets of radio buttons 52 and 5
3 are arranged. First set of radio buttons 52
Is the paper speed at the level recorder
Radio button 53 of the second set
Is the range scale in the level recorder (Range Sc
ale).

FIGS. 7A and 7B are two charts showing different feeding speeds and range scales. FIG. 7A shows a feeding speed of 0.3 mm / s and a range scale of 1.0 mm / d.
In the chart drawn in B, (B) shows a paper feed speed of 1 mm /
2 is a chart drawn on a range scale of 2.0 mm / dB. A portion surrounded by a broken line in FIG. 7A corresponds to FIG. As described above, in the system 1 of the present embodiment, the chart of the data obtained by the measurement can be drawn at various feeding speeds and range scales. When the user clicks the print button 54 in a state where the chart diagram is drawn in this manner, the chart display unit 24 prints the chart diagram using the printing device 14.

Although the embodiment of the present invention has been described above, it goes without saying that the embodiment of the present invention is not limited to the above.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a noise measurement management system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a management window displayed on a display device.

FIG. 3 is a diagram showing a menu configuration of a management window.

FIG. 4 is a view showing a measurement window displayed on the display device.

FIG. 5 is a diagram showing a field configuration of a database file for storing measurement data.

FIG. 6 is a diagram showing a chart window displayed on a display device.

FIGS. 7A and 7B are two chart diagrams having different sheet feeding speeds and range scales. FIGS.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Noise measurement management system 2 ... Personal computer system (personal computer) 3 ... Sound level meter 4 ... Microphone 10 ... Central control device 16 ... Serial communication interface 17 ... Voice input interface 21 ... Management part 22 ... Measuring part 23 ... Voice recording Section 24 ... Chart display section

Claims (2)

(57) [Claims] 1. A sound level meter that outputs a measurement signal indicating a sound level value at a measurement point, a microphone that outputs an audio signal that changes according to a sound pressure at the measurement point, and a sound level meter that receives an output signal of the sound level meter. A noise measurement management system including one input unit, a second input unit for receiving an output signal of the microphone, a storage device for storing data, and a computer system including a central processing unit, wherein the noise meter outputs an output. A data storage function of collecting a measurement signal at a predetermined time interval and storing data of a sound level value indicated by the measurement signal in the storage device in association with data of a time at which the measurement signal is collected; A level determination function for determining whether or not the signal is equal to or more than a predetermined reference value, and a sound signal output from the microphone when the level value is equal to or more than the reference value. Data is collected for a fixed period of time and indicates the time change of the audio signal.
A noise measurement management system having a real sound recording function of storing the actual sound in the storage device in association with the level value data. 2. A first input unit to which a sound level meter for measuring sound and outputting a measurement signal indicating a level value thereof can be connected, and a microphone for outputting an audio signal which changes according to the surrounding sound pressure can be connected. A second input unit, a storage device for storing data, and a computer including a central processing unit. A measurement signal output from the sound level meter is collected at predetermined time intervals, and a sound level value indicated by the measurement signal is collected. Storing the data in the storage device in association with the data of the time at which the measurement signal was collected; determining whether the level value is equal to or greater than a predetermined reference value; and determining that the level value is equal to or greater than the reference value. When
A computer that records a program for executing a procedure of collecting an audio signal output from the microphone for a predetermined time and storing data indicating a time change of the audio signal in the storage device in association with the level value data A readable recording medium.