JP2000009527A - Noise-monitoring system and cable transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a human load required for a noise-monitoring system by obtaining the sample of a noise level for each unit time for comparing with a reference noise level, by judging that the sample is abnormal when the repetition of the sample exceeding a reference successively exceeds setting time, and by collectively displaying the abnormal sample. SOLUTION: A microphone 3 converts sound being captured at an installation place to an electric signal, and outputs the electric signal as a voice signal corresponding to the sound pressure level of noise by a differential amplifier 8. A noise meter 9 samples the voltage signal of the amplifier 8 in a fixed cycle. A noise-monitoring system 1 judges the result of frequency analysis in four ways, namely regarding a time rate, equivalence, a short-time noise level, and data to be judged. The system 1 distinguishes a group to be judged where it is judged that the noise level of the equivalence and the time rate is abnormal from a normal one for displaying, and the generation of abnormality in the past can be known by seeing display without stationing a watchman near the noise-monitor system 1, thus reducing a human load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise monitoring system that measures generated noise and reports the result according to the measurement result.

[0002]

2. Description of the Related Art A noise level measuring method is defined in Japanese Industrial Standards (JIS) Z8731, and an equivalent noise level Leq, a time rate noise level Lx, and the like are defined as representative values of the noise level. Then, a person who wants to prevent noise determines whether or not the representative value of these noise levels satisfies a certain allowable criterion, and takes measures against noise that does not satisfy the allowable criterion. In order to take countermeasures, it is common practice to listen to the noise with the human ear, analyze the factors, and make improvements to the source or soundproofing system to meet acceptable standards.

Conventionally, there has been known a noise monitoring system which separates noise from various sounds and issues a warning.

[0004] In the noise alarm system 100 shown in FIG. 8, a microphone 101 outputs an output signal corresponding to a sampled sound. The output signal of the microphone 101 is
06. The measuring device body 106 is a monitoring unit 102
And an amplifying unit 104, and a setting unit 103.
The monitoring unit 102 receives the output signal of the microphone 101, and sends the output signal of the microphone 101 to the amplifying unit 104 when an input signal of a certain level (threshold) or more is input. The amplifying unit 104 amplifies the transmitted signal and outputs the amplified signal to the speaker 105. The speaker 105 emits a sound corresponding to the sound collected by the microphone 101. If there is no input above a certain level, the output signal of the microphone 101 is not input to the amplifier 104, and the speaker 105 does not sound. By operating a dial provided in the setting unit 103, a threshold and a duration can be set.

[0005]

In the above-described noise monitoring system, the analysis of the factors of noise relies on human hearing. If the pronunciation is missed, no measures can be taken. Must be resident in the area where you can hear the speakers. Therefore, a human burden is large.

On the other hand, in the noise monitoring system, it is possible to record in place of sounding. However, in this case, it is necessary to reproduce the recording and make a judgment by hearing, so that the human burden cannot be reduced.

Accordingly, an object of the present invention is to reduce the human burden required for a noise monitoring system.

In the noise monitoring system, a microphone 101 is installed outdoors, and a coaxial cable or the like is laid and wired to the measuring apparatus main body 106 installed indoors. Performing the laying work of the coaxial cable every time the position where the microphone 101 is installed is changed becomes a heavy burden.

Therefore, an object of the present invention is to reduce the burden of laying work by diverting existing wiring.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is as set forth in claim 1.
Can be solved by the noise monitoring system described in (1). That is, the noise monitoring system according to claim 1, an audio input unit that outputs an audio signal according to the input sound pressure level,
According to the audio signal output from the audio input unit, a noise level acquisition unit that repeatedly acquires a sample of the noise level every unit time, and compares the acquired noise level of each sample with the reference value of the noise level. When a sample exceeding the reference value is continuous, a continuous time is acquired, and when the acquired continuous time exceeds a set time, a determination unit that determines the continuous sample as an abnormal sample, the reference value and the set time And a display unit for collectively displaying all the abnormal samples obtained over a certain period of time.

The noise monitoring system according to the first aspect displays all the abnormal samples acquired over a certain period of time. Therefore, even if a person does not stay near the noise monitoring system, it is possible to know an abnormality that has occurred in the past by looking at the display, thereby reducing the human burden.

Further, the object of the present invention can be solved by a noise monitoring system according to claim 5. That is, claim 5
The noise monitoring system according to the above, an audio input unit that outputs an audio signal according to the input sound pressure level, and, according to the audio signal output from the audio input unit, repeatedly sample the noise level every unit time A noise level obtaining unit for obtaining
The acquired noise level is compared with the reference value of the noise level, and when samples exceeding the reference value are consecutive, the continuous time is acquired, and any of the acquired continuous times is set for a plurality of set times. A determination unit that determines the continuous sample as an abnormal sample if more than one, a storage unit that stores the reference value and a plurality of the set times, and collectively displays all the abnormal samples obtained over a certain period of time. A display unit.

A noise monitoring system according to a fifth aspect displays all the abnormal samples acquired over a certain period of time. In addition, the determination is performed for each of the plurality of set times. Therefore, even if a person does not stay near the noise monitoring system, it is possible to know an abnormality that has occurred in the past by looking at the display, so that it is possible to monitor various noises and reduce a human burden.

The object of the present invention can be solved by a noise monitoring system according to the present invention. That is, the noise monitoring system according to claim 10, wherein the sound input unit outputs a sound signal corresponding to the input sound pressure level, and the noise monitoring unit outputs the sound signal every unit time according to the sound signal output from the sound input unit. A noise level acquisition unit that repeatedly acquires a sample of the level, and compares the acquired noise level of each sample with a reference value of the noise level.If samples exceeding the reference value are consecutive, the continuous time is acquired. A determination unit that determines a continuous sample as an abnormal sample when the obtained continuous time exceeds a set time, a storage unit that stores the reference value and the set time, and all the abnormal samples obtained over a certain period of time. , A demodulator that demodulates the abnormal sample into an audio signal, and a sound generator that outputs the demodulated audio signal.

[0015] The noise monitoring system according to claim 10 is
All the abnormal samples obtained over a certain period are displayed collectively. Therefore, even if a person is not resident near the noise monitoring system, the display shows that an abnormality occurred in the past,
Since it can be played back as voice, human burden was reduced.

Further, the object of the present invention can be solved by a noise monitoring system according to the present invention. That is, the noise monitoring system according to claim 17, wherein the sound input unit outputs a sound signal corresponding to the input sound pressure level, and the noise monitoring unit outputs a sound signal per unit time according to the sound signal output from the sound input unit. A noise level acquisition unit that repeatedly acquires a sample of the level, and compares the acquired noise level of each sample with a reference value of the noise level.If samples exceeding the reference value are consecutive, the continuous time is acquired. A first determining unit that determines a continuous sample as an abnormal sample when the acquired continuous time exceeds a set time, and stores the reference value, the set time, and a reference frequency characteristic that is a frequency characteristic of a previously collected sound. A storage unit that analyzes the frequency characteristics of the abnormal sample to obtain a sample frequency characteristic, and a frequency analysis unit that compares the sample frequency characteristic with the reference frequency characteristic, Characterized in that it comprises a second determination unit that determines specimen as dissimilar samples, and a display unit for collectively display all the dissimilar specimen obtained over a period of time.

According to the noise monitoring system of the present invention, all the dissimilar samples acquired over a certain period are displayed collectively. Therefore, even if a person does not stay near the noise monitoring system, it is possible to know the abnormalities that have occurred in the past by looking at the display and to obtain a dissimilar sample as unknown noise, which further imposes a human burden. Could be reduced.

Further, the object of the present invention can be solved by a noise monitoring system according to claim 25. That is, the noise monitoring system according to claim 25, further comprising: a sound input unit that outputs a sound signal corresponding to the input sound pressure level; and a noise monitor for each unit time in accordance with the sound signal output from the sound input unit. A noise level acquisition unit that repeatedly acquires a sample of the level, and compares the acquired noise level of each sample with a reference value of the noise level.If samples exceeding the reference value are consecutive, the continuous time is acquired. A first determining unit that determines a continuous sample as an abnormal sample when the acquired continuous time exceeds a set time, and stores the reference value, the set time, and a reference frequency characteristic that is a frequency characteristic of a previously collected sound. A storage unit that analyzes the frequency characteristics of the abnormal sample to obtain a sample frequency characteristic, and a frequency analysis unit that compares the sample frequency characteristic with the reference frequency characteristic, A second determination unit that determines a sample as a dissimilar sample, a display unit that collectively displays all the dissimilar samples acquired over a certain period of time, and a digital signal sequentially output from the audio input unit. A digital conversion unit for sequentially outputting the obtained audio data, and a second storage unit for sequentially discarding the oldest audio data stored each time the latest audio data sequentially output by the digital conversion unit is stored.
If the determination unit determines that the two are not similar, the demodulation unit demodulates the audio data stored in the second storage unit into an audio signal, and a sound generation unit that outputs the demodulated audio signal. .

According to the noise monitoring system of the twenty-fifth aspect, all the abnormal samples acquired over a certain period are displayed collectively. Therefore, even if a person does not reside near the noise monitoring system, it is possible to know abnormalities that have occurred in the past by looking at the display, obtain a dissimilar sample as unknown noise, and furthermore, obtain a second storage unit. Can also output the sound data from before the generation of the unknown noise stored in the storage device, thereby further reducing the human burden.

The object of the present invention can be solved by a wired transmission system according to claim 33. That is, the wired transmission system according to claim 33, an amplifier that amplifies an input signal and outputs an amplified signal, and a stranded wire pair including a plurality of conductors connected to the amplifier and transmitting the amplified signal, A differential amplifier that performs a differential amplification operation in accordance with the amplified signal transmitted through each conductor of the stranded wire pair to obtain an output signal.

According to the wired transmission system of the present invention, since the existing twisted pair can be used, the burden of the laying work can be reduced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A noise monitoring system according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a system configuration diagram showing an outline of the noise monitoring system 1.

The all weather screen 2 is installed at a predetermined height from the ground by a tripod 2a. All Weather Screen 2
Has a built-in microphone 3. The all-weather screen 2 protects the microphone 3 by blocking water drops, sunlight, and the like. However, the all-weather screen 2 has a number of holes through which sound passes in order to ensure the sensitivity of the microphone 3. The microphone 3 converts sound captured at the installation location into an electric signal and outputs the signal as an audio signal.

The power amplifier 4 amplifies the audio signal output from the microphone 3 and outputs a low impedance signal as a transmission signal.

The telephone line terminal 5 is a connection device for connecting the output (transmission signal) of the power amplifier 4 to the telephone line 6. The telephone line terminal 5 displays the waveform of the transmission signal,
It is converted into a waveform suitable for transmission on the telephone line 6. The telephone line terminal 5 is installed indoors.

The telephone line 6 transmits a transmission signal to the filter amplifier 7. The telephone line 6 uses a twisted pair (twisted pair cable). The two cables of the twisted pair are respectively connected to the power amplifier 4 and transmit the output (transmission signal) of the power amplifier 4. During transmission through the telephone line 6, low-frequency noise and high-frequency noise may be added to the transmission signal.

The filter amplifier 7 is a low-pass filter that blocks high-frequency noise on a transmission signal on the telephone line 6. The filter amplifier 7 cuts off high-frequency noise with respect to the transmission signal transmitted through each twisted pair of the telephone line 6, and then outputs each transmission signal with the high-frequency noise cut off.

The differential amplifier 8 cancels low frequency noise on the telephone line 6 from the transmission signal output from the filter amplifier 7. Each transmission signal transmitted through the twisted pair of the telephone line 6 is input to the differential amplifier 8.
Since the input of the in-phase component is blocked in the differential amplifier 8, it is possible to cancel the noise component that is present during the transmission from the transmission signal. The output of the differential amplifier 8 is a voltage signal whose voltage value changes according to the sound pressure level of the sound (noise) captured by the microphone 3. The output of the differential amplifier 8 is input to the sound level meter 9.

The wired transmission system including the microphone 3, the power amplifier 4, the telephone line terminal 5, the telephone line 6, the filter amplifier 7, and the differential amplifier 8 can be constantly operated. Always outputs a voltage signal corresponding to the sound pressure level of the noise captured by the microphone 3. With this wired transmission system,
In order to transmit the output of the microphone 3 to the sound level meter 9, the cable of the existing telephone line can be diverted without newly laying a coaxial cable or the like. Also, Eterne
A stranded wire pair for LAN, such as a stranded wire pair for t (defined in IEEE802.3), can also be diverted. In this case, instead of the telephone line terminal 5, the characteristic is
Use a terminal matched to the twisted pair for t.

The sound level meter 9 samples a voltage signal output from the differential amplifier 8 at a constant cycle. In sampling, the output of the differential amplifier 8 is A / D converted by an A / D converter ADC 2 provided inside the sound level meter 9. The sound level meter 9 has two channels of A / D converters. The first channel A / D converter ADC1 and the second channel A / D converter ADC2 execute A / D conversion at different sampling frequencies,
It outputs sampling data, each of which is 8-bit digital data.

The computer 10 includes a hard disk for storing software and data as magnetic information, a CPU for processing data by the software, a RAM for providing a memory space used by the CPU, and various interfaces. Further, input devices such as a keyboard and a mouse are connected through one type of interface. In the following description, the computer 1
The processing executed by the hardware provided in the computer 10 and the processing executed by the software operating on the computer 10 are both described as operations of the computer 10.

The computer 10 is connected to the sound level meter 9 via an interface, and takes in 8-bit sampling data output from the two-channel A / D converter of the sound level meter.

A monitor 11 is output to the computer 10 as a display device via a graphic interface. The monitor 11 is a computer 10
Is a CRT device that displays an image on a cathode ray tube based on the graphic data obtained in step (1).

The computer 10 also has a DAT 12 (di) as a recording device via a voice interface.
digital audio taperecorder)
Is connected. The DAT 12 is controlled by software running on the computer 10 via an interface. The software instructs the DAT 12 to start and stop recording, and upon receiving a signal from the DAT 12 indicating that the capacity of the magnetic tape has been used up, rewinds the magnetic tape once and prepares for overwriting. Instead of preparing for overwriting, a message urging the replacement of the magnetic tape may be displayed on the monitor 11.

The computer 10 adds data of the time (acquisition time) taken from the sound level meter 9 to the sampling data taken from the A / D converter ADC 1 of the sound level meter 9. The sampling data taken in from the A / D converter ADC2 is in the form of audio data such as a WAVE file.
Is stored in the ring buffer area set in. In this ring buffer area, every time the latest sampling data is taken in one by one from the A / D converter ADC2, the sampling data is discarded one by one from the oldest one.

The computer 10 can use a database. The sampling data taken in from the A / D converter ADC1 and added with the acquisition time is stored as determination target data in accordance with the data specifications of the database. Also, if a database is used, it is possible to take out sampling data specifying the acquisition time. The computer 10 extracts a determination target group including a plurality of determination target data stored in the database and determines whether each determination target group is abnormal / normal.
Then, the dissimilarity / similarity is determined.

Judgment is performed based on each judgment object data of the judgment object group, based on the noise level (noise level L _PA , time rate noise level L) specified in Japanese Industrial Standard (JIS) Z8731.
x, equivalent noise level Leq, etc.), and compare the magnitude with a set reference value. The criteria for the determination and a specific method will be described later.

The data to be determined are arranged in the order of acquisition time in the database and are processed into graphic data to be displayed in a graph format such as a line graph or a bar graph. Graphic data is stored on the monitor 10
Sent to Each of the determination target groups processed into graphic data, when displayed on the monitor 11 in a graph format, includes those belonging to the determination target group determined to be abnormal and those belonging to the determination target group determined to be normal. It is displayed so that it can be distinguished.

The computer 10 extracts a new determination target group each time it acquires a fixed number of sampling data from the A / D converter ADC 1 of the sound level meter 9,
And processing to graphic data is executed, so that the noise level graph displayed on the monitor 10 is displayed in real time.

The speaker 13 is connected to an audio interface of the computer 10 and emits sound in accordance with an audio signal.

FIGS. 2 to 6 are flowcharts for explaining the processing procedure of the noise monitoring system. This noise monitoring system performs four kinds of determinations in real time. Determination 1 is a determination of the time rate noise level Lx. Determination 2 is a determination of the equivalent noise level Leq. Decision 3 is a determination of the short noise level L _PA. The judgment 4 judges the result of the frequency analysis on the data to be judged.

(Preprocessing) Sampling is performed at a1 in FIG. The sampling accuracy was 1 dB (decibel), and there were 82 steps including 81 steps from 0 to 80 dB and more than 80 dB.

At b1, the sampling data is added to the acquisition time and stored in the database. Since the sampling period is constant, the number of sample data corresponds to time.

At c1, 10 consecutive data from the database
The determination target data for a minute is extracted as a determination target group 1.

At d1, a time rate noise level Lx, an equivalent noise level Leq, and the like are calculated by the determination target group 1.

When the procedure up to d1 is completed, the sampling data acquired at the latest time among the sampling data belonging to the determination target group 1 is specified, and the sampling data next to the specified sampling data is set at the top. The determination target data for 10 minutes (600 pieces) subsequent to the sampling data of (1) is created as the determination target group 2. The procedure from a1 to d1 is repeated for the created determination target group 2. Further, the data to be determined for each 10 minutes is successively created as the determination target group 3, the determination target group 4,..., And a1 to d1 are output for each of the determination target groups until an end command is issued (e1).
Is repeated.

Next, a sample of the noise level, percentile level Lx, equivalent sound level Leq, by brief noise level L _PA or the like, it is determined below.

(Determination 1) Calculated time rate noise level L
For the magnitude of x and the reference level Ref1, it is determined whether or not the time rate noise level Lx> the reference level Ref1 is satisfied (a2). The reference level Ref1 can be set arbitrarily with an accuracy of 1 dB.

As a result of the comparison at a2, the time rate noise level L
x> The number of times that the determination target group determined to have the reference level Ref1 continues is acquired (b2). It is determined whether or not the obtained number of consecutive times is equal to or greater than the set number of times (c2). In addition, the number of consecutive times,
Since the cycle is also determined for the set number of times, the time can be specified by specifying the number of times.

If the number of consecutive times is equal to or more than the set number, all the determination target groups where the time rate noise level Lx> the reference level Ref1 are continuously determined as abnormal data (abnormal samples) (d2). The set number of times in c2 can be set arbitrarily from 3 to 12 times. That is, when three times are designated, it is determined whether or not the time rate noise level Lx has exceeded the reference level Ref1 for 30 consecutive minutes.
When two times are specified, it is determined whether or not the time rate noise level Lx has exceeded the reference level Ref1 for 120 minutes continuously.

A determination target group determined to be abnormal data;
When displayed on the monitor 11, the determination target group determined to be normal is distinguished from each other and displayed.

(Determination 2) Calculated equivalent noise level Le
It is determined whether or not q and the reference level Ref2 satisfy the equivalent noise level Leq> the reference level Ref2 (a3). The reference level Ref2 can be set arbitrarily with an accuracy of 1 dB.

As a result of the comparison at a3, the equivalent noise level Le
q> Obtain the number of times that the determination target group determined to have the reference level Ref2 continues (b3). It is determined whether or not the obtained number of continuous times is equal to or greater than the set number of times (c3).

If the number of consecutive times is equal to or greater than the set number, all the determination target groups where the equivalent noise level Leq> the reference level Ref2 are continuously determined as abnormal data (abnormal samples) (d3). The number of times set in c3 can be arbitrarily set from 3 to 12 times. Further, the determination and display of the determination target group determined to be abnormal data and the determination target group determined to be normal are performed in the same manner as in the determination 1.

(Determination 3) In FIG. 5, the short-time noise level L
Determining a _PA, the magnitude of the reference level Ref3, whether satisfies the noise level L _PA> reference level Ref3 brief (a4). The reference level Ref3 can be set arbitrarily with an accuracy of 1 dB.

As a result of the comparison in a4, the number of times that the data to be determined which has been determined to be short-time noise level L _PA > reference level Ref3 is obtained (b4). It is determined whether or not the obtained number of continuous times is equal to or greater than the set number of times (c4).

When the number of consecutive times is equal to or more than the set number, all the data to be determined that continuously satisfy the level of the data to be determined> the reference level Ref3 are determined as abnormal data (abnormal samples) (d4).

The set number of times in c4 can be arbitrarily set from 1 to 10. That is, when one time is designated, the noise for a short time of one second is reduced to the reference level Ref.
It is determined whether or not the noise level exceeds the threshold value 3, and if the number of times is specified as 10, the noise for a short time of 10 seconds is reduced to the reference level Ref.
3 is determined.

A determination target group determined to be abnormal data;
The distinction and display from the judgment target group judged to be normal are judgment 1
Perform in the same way as

(Determination 4) In determination 4, the abnormal data is compared with the waveform data to be compared to make a determination. First, the waveform data to be compared will be described.

The waveform data to be compared is waveform data of various sounds previously collected in an environment where the microphone 3 is installed, and a waveform data group to be compared is constituted by these waveform data. Each of the comparison target waveform data, after adding a keyword indicating the cause,
Registered in the database.

The data group for comparison is divided into two groups. These two groups are the first waveforms, which are the sound waveforms that require noise countermeasures.
A second group, which is a waveform of a sound that does not require noise countermeasures. When the present noise monitoring system 1 is used to monitor the noise generated by a factory, the noise generated inside the factory requires measures by the person who installed the factory, and the noise generated outside the factory cannot be taken. , Measures can be made unnecessary. In the first group, for example, an engine sound of a forklift, a brake sound of a bicycle, a driving sound of a boiler, and the like are registered in the first group as sounds inside the factory that require measures. In the second group, for example, a passing sound of an airplane, a siren of an emergency vehicle, and the like are registered as sounds outside the factory that require no countermeasures.

Next, the processing procedure of judgment 4 will be described.

In FIG. 6, the abnormal data determined in the determination 3 is demodulated into an analog signal and output as data representing a waveform as a sound wave (hereinafter referred to as waveform data) (a5).

The demodulated waveform data is analyzed (frequency analyzed) (b5).

The waveform data analyzed in b5 is compared with each of the waveform data to be compared belonging to the first and second groups as shown in Table 1 (c5).

As shown in Table 1, when the waveform data coincides with the group of comparison target data requiring countermeasures (internal) and does not match the group of comparison target data requiring no countermeasure (external), the waveform data is determined to be abnormal. (E5).

If the waveform data coincides with the comparison target data group that requires (internal) countermeasures and the comparison target data group that requires no (external) countermeasures, the waveform data is determined to be abnormal (e5).

If the waveform data does not coincide with the comparison target data group requiring measures (internal) and coincides with the comparison target data group requiring no measures (external), it is determined that the waveform data is normal (d5).

If the waveform data does not match the comparison target data group requiring a countermeasure (internal) and the comparison target data group requiring no countermeasure (external), the waveform data is determined to be dissimilar (f5). the waveform data determined to be abnormal in e5;
The waveform data determined to be unmatched in f5 is recorded on the hard disk (g5, h5). When recording the waveform data determined to be abnormal or inconsistent on the hard disk (g5, h5), the sampling data stored in the ring buffer area of the RAM is added and recorded on the hard disk. In this addition, the sampling data in the ring buffer area is continuously added immediately before the waveform data determined to be abnormal. Therefore, when the waveform data recorded on the hard disk is reproduced, the waveform data for 10 seconds immediately before it is determined to be abnormal and the waveform data determined to be abnormal are reproduced without interruption.

[0072]

[Table 1]

The waveform data determined to be abnormal data in the above determinations 1, 2 and 3 to 4 is sounded from the speaker 13 via the voice interface. The waveform data determined to be dissimilar in f5 is recorded in DAT12. The duration of the sound from the speaker 13 and the duration of the recording to the DAT can be set arbitrarily and independently of each other within a range of 0 to 5 minutes at intervals of 1 minute.

The waveform data recorded on the hard disk after being determined to be dissimilar in f5 can be registered in a data group to be compared after adding a keyword. If the waveform data to be registered has been deleted from the hard disk, the audio signal recorded on the DAT can be converted into waveform data and then registered in the data group for comparison.

The above-mentioned preprocessing, judgment 1, judgment 2, judgment 3+
Each processing of the judgment 4 is executed in the multitask environment. When the procedure up to d1 is completed in the pre-processing, the sampling data acquired at the latest time among the sampling data belonging to the determination target group 1 is specified, the next sampling data of the specified sampling data is set to the top, and the top is set. The 10-minute determination target data subsequent to the sampling data of No. is created as the determination target group 2. For the created judgment target group 2, a1 to d1
Is repeated. Further, data to be determined for 10 minutes is created as a determination target group 3, a determination target group 4,..., And the procedure from a1 to d1 is repeated for each determination target group.

The respective processes of judgment 1, judgment 2, judgment 3 + judgment 4 are executed in parallel with this preprocessing. Processing to graphic data is also performed in a multitasking environment. Processing into graphic data is a work of developing the numerical value of each data to be determined on a bitmap and performing color coding.

Next, the noise monitoring system 1 will be described with reference to the timetable of the operation of the noise monitoring system shown in Table 2.

[0078]

[Table 2]

The noise monitoring system 1 operates by dividing a day into five time zones. The five time zones are 0:00 to 6:00 (time zone 1), 6:00 to 8:00 (time zone 2), 8:00 to 17:00 (time zone 3), 17:00 to 23:00 (time zone 4), It is 23:00 to 24:00 (time zone 5). In time zone 1, the reference levels Ref1, Ref2, and Ref3 are all set to 55 dB. In time zone 2, the reference levels Ref1, Ref2, R
Both ef3 are set to 70 dB. In time zone 3, the reference levels Ref1, Ref2 and Ref3 are all set to 75 dB. In time zone 4, the reference levels Ref1, Ref
Both 2 and Ref3 are set to 65 dB. In time zone 5, the reference levels Ref1, Ref2, and Ref3 are all 55d.
B is set.

Time zone 1 and time zone 5 are midnight hours and early hours, respectively, and many of the facilities in the factory stop operating. It is needless to say that this time zone is not limited to the factory and generally generates less noise, and is subject to severe criticism against the generation of noise. In the noise monitoring system 1, this time zone is the reference level Ref1, Ref2, Re.
Both f3 are set to 55 dB. This allows for late night,
The noise generated at dawn can be monitored closely.

In the time period 2, a transportation (a truck or the like) for bringing the raw materials into the factory emits noise. This time zone is not limited to factories, but generally produces noise, and the noise is more tolerant of midnight than at dawn. In the noise monitoring system 1, the reference levels Ref1, Ref2, and Ref3 are all 70.
It is set to dB. Thus, it is possible to monitor the noise strictly at midnight, though not so much as at dawn.

In the time zone 3, each facility in the factory is in operation, and considerable noise may be generated. Therefore, as the allowable upper limit, the reference levels Ref1, Ref2, R
ef3 was set to 75 dB. Thus, the noise can be strictly monitored even in a time zone where a considerable noise may be generated.

In time zone 4, the operation of many of the facilities in the factory is stopped, and the products are carried out and the facilities are cleaned up. During this time, noise is generated not only in factories, but in general,
It is more tolerant of noise than midnight. In the noise monitoring system 1, the reference levels Ref1, Ref2,
Ref3 is set to 65 dB. Thus, it is possible to monitor the noise strictly at midnight, though not so much as at dawn.

As described above, by changing the reference level depending on the time zone, it is possible to appropriately monitor the noise. Further, not only the time zone, but also Saturday and Sunday and national holidays can be monitored at a reference level different from other days.

FIG. 7 is a conceptual diagram showing an example of a display by the noise monitoring system 1. The result of the judgment 1 (see FIG. 3) is shown by a bar graph. The reference level Ref2 = 20d at L95 (x = 95) of the time rate noise level Lx
B, an example is described in which the set number of times is three (duration 30 minutes). In the bar graph of FIG. 7, the sound pressure level (d
B), the number (No) of the determination target group is shown on the horizontal axis.

In FIG. 7, among the determination target groups, Nos. 3 to 5, Nos. 17 to 27, and Nos. 35 to 3 are displayed as abnormal.
8 groups. These groups are displayed on the monitor 11 so as to be distinguished from other determination target groups.
In particular, the judgment target groups 10, 1 exceeding the reference level Ref2
The numbers 1, 2, 43, 47, and 48 are determined to be normal because the number of consecutive times (2 times) is less than the set number of times (3 times). In the example of FIG. 7, the determination results for 52 determination target groups, that is, 8 hours and 40 minutes are shown. Noise monitoring system 1
Then, the scale of the horizontal axis, that is, the width of the displayed time can be arbitrarily set from every second, every minute, every hour, every day, every week. This setting is performed by operating the keyboard or the mouse of the computer 10.

[0087] adopts multiwindow system in noise monitoring system 1, percentile level Lx, equivalent sound level Leq, displayed in such a short time bars on the determination result, etc. are different windows noise level L _PA noise The operator can arbitrarily switch which is displayed by operating the keyboard and mouse of the computer 10, and furthermore, a plurality of windows are displayed side by side to display different noise levels. Graphs can be displayed simultaneously.

In the noise monitoring system 1 described above, the observer can hear the sound produced by the speaker 13 and judge the factor of the noise by hearing. Even if the sound emitted from the speaker 13 is overlooked, it is sufficient to confirm whether or not any of the determination target groups displayed on the monitor 11 indicates an abnormality. The short-time noise level L _PA , the time rate noise level Lx, the equivalent noise As for the level Leq, since the abnormality determination target group is recorded, it can be reproduced to determine the factor of the noise. If it is not possible to make a determination based on the reproduced sound, it is sufficient to go to the installation location of the microphone 3 and perform the determination by hearing.

The noise monitoring system 1 displays the determination target group determined to be abnormal with respect to the equivalent noise level Leq and the time rate noise level Lx based on the results of the determinations 1 and 2 in distinction from the normal determination target group. Therefore, even if the observer does not stay near the noise monitoring system, it is possible to know the abnormality that has occurred in the past by looking at the display, so that the noise can be monitored and the human burden can be reduced.

[0090] Also, noise monitoring system 1, the result of decision 3, the abnormality determined as the determination target groups with respect to short noise level L _PA is displayed differently from a normal determination target group. Therefore, even if the observer does not stay near the noise monitoring system, the operator can know the abnormality that has occurred in the past by looking at the display, thereby reducing the human burden.

[0091] Noise Levels Leq and percentile level Lx is generally an index that shows the noise leveling le noise over time, short noise level L _PA is the noise of the noise to stop in a short period of time This is an index indicating the level. Therefore, the purpose of each measurement is different. Noise monitoring system 1
When acquiring the equivalent noise level Leq and the time rate noise level Lx, the set time to be compared with the continuous time exceeding the reference levels Ref1 and Ref2 is 30 minutes to 120 minutes.
Both are equal. On the other hand, when obtaining a short noise level L _PA, set to be compared with the continuous time exceeding the reference level Ref3 time is 1 to 10 seconds. By setting different set times according to the type of the noise level in this way, it is possible to perform measurement in accordance with the purpose of measurement.

Also, in the judgment 3, the short-time noise level L _PA
Exceeds the reference level Ref3, unregistered noise is selected and recorded (recorded in the DAT 12). When desired, this recording can be demodulated into an audio signal and reproduced from the speaker 13. The monitor can identify the abnormal determination target group by the display, so that only the one determined to be abnormal is designated, reproduced from the speaker 13, the reproduced sound reproduced from the speaker 13 is heard, and the factor of the noise is analyzed. However, it is possible to provide a series of feedbacks to improve the source and the soundproofing system. If the equivalent noise level Leq exceeds the reference level Ref1 or the time-period noise level Lx exceeds the reference level Ref2 in the determinations 1 and 2, the data can be recorded in the DAT 12 and reproduced from the speaker 13 when desired. In this case, recording on the DAT 12 can be arbitrarily set within a range of 0 to 5 minutes in a one-minute range.

The data to be judged of the group of objects judged to be abnormal in judgments 1 to 4 are demodulated into audio signals and reproduced by the speaker 13. The observer can listen to the reproduced sound reproduced from the speaker 13, analyze the factors of the noise, and provide a series of feedback to improve the generation source and the soundproofing system.

[0094] Instead of the above embodiment, for example, percentile level Lx in noise meter, equivalent sound level Leq, it may be configured to calculate the noise level L _PA such a short noise.

As the display means, C using a CRT
Although the RT device has been illustrated, the invention is not limited thereto, and a liquid crystal monitor, a plasma monitor, or the like may be used.

Although the example in which the database is constructed, determined, and displayed by a single computer has been described, the distributed processing may be performed by a client server system or the like. In particular, if you display it with a portable client,
This is preferable because it is not necessary to regularly visit the installation location of the display unit.

The system from the microphone 3 to the sound level meter 9 may be a single channel or more channels. In this case, the computer 10 processes the sample data output from the plurality of sound level meters 9 in parallel.

As an example of distinguishing the abnormal data from the normal data, the color of the bar, the background color, the thickness of the line, the pattern of the bar, and the like displayed on the graph may be different from each other.
In addition, marks indicating abnormalities (US mark, arrow, back-calculated shape, etc.)
May be distinguished. Further, the background color may be changed and displayed according to the time zone described in Table 2.

Also, an example has been described in which the data to be judged is acquired at a constant cycle and the continuous time of the noise is acquired by the number of times of the group of objects to be judged exceeding the reference levels Ref1, Ref2 and Ref3. It may be executed to acquire the continuous time. In this case, for example, the reference level Ref
The timer is started immediately after the determination target groups exceeding 1, 2, and 3 are acquired, and the timer is terminated at the set time. If all of the determination target groups obtained before the timer expires exceed the reference levels Ref1, Ref2, and Ref3, these determination target groups are determined to be abnormal. If the acquired determination target group continuously exceeds the reference levels Ref1, Ref2, and Ref3 even during the timer operation and after the end of the timer operation, it is determined that these continuous determination target groups are abnormal.

An example in which one reference value is set for one noise level has been described. However, two or more reference values are set, and normal, abnormal, extremely abnormal, and more than three levels are distinguished. This may be displayed.

The example has been described in which the waveform data to be compared is divided into two groups, and a case in which none of them is determined to be dissimilar has been described. However, dissimilarity may be determined by dividing into three or more groups. However, the dissimilarity may be determined by one group. Further, which group is dissimilar to the group may be displayed.

[0102]

According to the noise monitoring system of the present invention, the human burden required for the noise monitoring system can be reduced.

Further, according to the wired transmission system of the present invention,
The burden of laying work was reduced.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram schematically showing a noise monitoring system 1. FIG.

FIG. 2 is a flowchart illustrating a processing procedure of the noise monitoring system.

FIG. 3 is a flowchart illustrating a processing procedure of the noise monitoring system.

FIG. 4 is a flowchart illustrating a processing procedure of the noise monitoring system.

FIG. 5 is a flowchart illustrating a processing procedure of the noise monitoring system.

FIG. 6 is a flowchart illustrating a processing procedure of the noise monitoring system.

FIG. 7 is a conceptual diagram showing an example of display by the noise monitoring system 1.

FIG. 8 is a conceptual diagram of a conventional noise monitoring system.

[Explanation of symbols]

 Reference Signs List 1 noise monitoring system 3 microphone 9 sound level meter 10 computer 11 monitor 12 DAT 13 speaker

Claims (33)

[Claims] 1. An audio input unit for outputting an audio signal corresponding to an input sound pressure level, and a noise level sample is repeatedly acquired every unit time according to the audio signal output from the audio input unit. The noise level acquisition unit compares the acquired noise level of each sample with the reference value of the noise level, and when samples exceeding the reference value are consecutive, acquires the continuous time, and acquires the acquired continuous time for the set time. A determination unit that determines the continuous sample as an abnormal sample when exceeding, a storage unit that stores the reference value and the set time, and a display unit that collectively displays all the abnormal samples obtained over a certain period. A noise monitoring system comprising: 2. The noise monitoring system according to claim 1, wherein the display unit displays the abnormal sample and a sample that is not determined as the abnormal sample separately. 3. The noise level acquiring section acquires samples of at least three types of noise levels: a time rate noise level, an equivalent noise level, and a short-time noise level. The noise monitoring system according to claim 1, wherein the determination is performed for each of the samples at the level. 4. The voice input unit includes: a microphone;
An amplifier for amplifying an output signal of the microphone and outputting an amplified signal; a stranded pair including a plurality of conductors connected to the amplifier and transmitting the amplified signal; and transmitting each conductor of the stranded pair. A differential amplifier for performing a differential amplification operation in accordance with the amplified signal to obtain an output signal, and outputting an output of the differential amplifier as the audio signal. 3. The noise monitoring system according to 3. 5. An audio input unit for outputting an audio signal corresponding to an input sound pressure level, and a noise level sample is repeatedly obtained for each unit time according to the audio signal output from the audio input unit. The noise level acquisition unit compares the acquired noise level of each sample with the reference value of the noise level, and when samples exceeding the reference value are consecutive, acquires the continuous time, and sets a plurality of acquired continuous times. A determination unit that determines a continuous sample as an abnormal sample when any one of the set times is exceeded, a storage unit that stores the reference value and a plurality of the set times, and a storage unit that stores all of the set times. A noise monitoring system comprising: a display unit for displaying abnormal samples in a lump. 6. The noise monitoring system according to claim 5, wherein the display unit displays the abnormal sample and a sample that is not determined as the abnormal sample separately. 7. The noise monitoring system according to claim 5, wherein the display unit displays which one of the plurality of set times the abnormal sample has exceeded. 8. The noise level acquiring section acquires samples of at least three types of noise levels, that is, a time rate noise level, an equivalent noise level, and a short-time noise level. 8. The method according to claim 5, wherein the determination is performed for each of the samples at the level.
A noise monitoring system according to item 1. 9. The sound input unit includes: a microphone;
An amplifier for amplifying an output signal of the microphone and outputting an amplified signal; a stranded pair including a plurality of conductors connected to the amplifier and transmitting the amplified signal; and transmitting each conductor of the stranded pair. And a differential amplifier that obtains an output signal by performing a differential amplification operation in accordance with the amplified signal, wherein an output of the differential amplifier is output as the audio signal. The noise monitoring system according to 7 or 8. 10. An audio input unit for outputting an audio signal according to an input sound pressure level, and a noise level sample is repeatedly acquired for each unit time according to the audio signal output from the audio input unit. The noise level acquisition unit compares the acquired noise level of each sample with the reference value of the noise level, and when samples exceeding the reference value are consecutive, acquires the continuous time, and acquires the acquired continuous time for the set time. A determination unit that determines the continuous sample as an abnormal sample when exceeding, a storage unit that stores the reference value and the set time, and a display unit that collectively displays all the abnormal samples obtained over a certain period of time, A demodulation unit for demodulating the abnormal sample into an audio signal,
A noise monitoring system comprising: a sound generator that outputs the demodulated audio signal. 11. The noise monitoring system according to claim 10, wherein the display unit displays the abnormal sample and a sample that is not determined as the abnormal sample separately. 12. The storage unit stores a plurality of the set times, and the determination unit determines the continuous samples as abnormal samples when the acquired continuous time exceeds any one of the plurality of set times. The noise monitoring system according to claim 10, wherein the noise monitoring is performed. 13. The noise monitoring system according to claim 12, wherein the display unit displays which of the plurality of the set times the abnormal sample has exceeded. 14. When at least one of the abnormal samples displayed collectively on the display unit is selected, an audio signal corresponding to the selected abnormal sample is output from the sounding unit. , 11, 12 or 13. 15. The noise level acquiring unit acquires samples of at least three types of noise levels, that is, a time rate noise level, an equivalent noise level, and a short-time noise level. The method according to claim 10, wherein the determination is performed for each of the level samples.
The noise monitoring system according to 12, 13, or 14. 16. The audio input unit according to claim 1, further comprising a microphone, an amplifier that amplifies an output signal of the microphone and outputs an amplified signal, and a plurality of conductors connected to the amplifier and transmitting the amplified signal. A line pair, and a differential amplifier that performs a differential amplification operation in accordance with the amplified signal transmitted through each conductor of the stranded line pair to obtain an output signal, and uses an output of the differential amplifier as the audio signal. 11. The method according to claim 10, wherein the output is performed.
The noise monitoring system according to 3, 14, or 15. 17. An audio input unit for outputting an audio signal according to an input sound pressure level, and a noise level sample is repeatedly acquired for each unit time according to the audio signal output from the audio input unit. The noise level acquisition unit compares the acquired noise level of each sample with the reference value of the noise level, and when samples exceeding the reference value are consecutive, acquires the continuous time, and acquires the acquired continuous time for the set time. A first determination unit that determines the continuous sample as an abnormal sample when the number of samples exceeds the predetermined value; a storage unit that stores the reference value, the set time, and a reference frequency characteristic that is a frequency characteristic of a previously collected sound; A frequency analysis unit that analyzes the frequency characteristics of the sample frequency characteristics to obtain the sample frequency characteristics, and compares the sample frequency characteristics and the reference frequency characteristics, and determines an abnormal sample that is not similar as a dissimilar sample. 2. A noise monitoring system comprising: a determination unit; and a display unit that collectively displays all of the dissimilar samples acquired over a certain period. 18. The noise monitoring system according to claim 17, wherein the display unit displays the dissimilar sample and a sample that is not determined as the dissimilar sample separately. 19. The method according to claim 19, wherein the storage unit stores a plurality of the set times, and the first determination unit performs the determination by the second determination unit on the abnormal sample determined by the shortest set time. The noise monitoring system according to claim 17 or 18, wherein 20. The noise monitoring system according to claim 17, wherein the display unit displays the abnormal sample and the dissimilar sample separately. 21. When at least one of the dissimilar samples displayed collectively on the display unit is selected, an audio signal corresponding to the selected dissimilar sample is output from the sounding unit. Item 17, 18, 19 or 20
A noise monitoring system according to item 1. 22. The noise level acquiring unit acquires at least three types of noise level samples, that is, a time rate noise level, an equivalent noise level, and a short-time noise level. 19. The method according to claim 17, wherein the determination is performed for each sample of the noise level of the type, and the second determination unit determines the similarity for each sample of the noise level of the short-time noise. 19,
22. The noise monitoring system according to 20 or 21. 23. The storage unit according to claim 17, wherein the storage unit stores the acquired sample frequency characteristic of the dissimilar sample as the reference frequency characteristic.
23. The noise monitoring system according to 1 or 22. 24. The audio input unit, comprising: a microphone, an amplifier that amplifies an output signal of the microphone and outputs an amplified signal, and a plurality of conductors connected to the amplifier and transmitting the amplified signal. A line pair, and a differential amplifier that performs a differential amplification operation according to the amplified signal transmitted through each conductor of the stranded pair to obtain an output signal, and outputs an output of the differential amplifier to the audio signal. 17. The image forming apparatus as claimed in claim 17, wherein:
The noise monitoring system according to 0, 21, 22 or 23. 25. An audio input unit for outputting an audio signal corresponding to an input sound pressure level, and a noise level sample is repeatedly acquired for each unit time according to the audio signal output from the audio input unit. The noise level acquisition unit compares the acquired noise level of each sample with the reference value of the noise level, and when samples exceeding the reference value are consecutive, acquires the continuous time, and acquires the acquired continuous time for the set time. A first determination unit that determines a continuous sample as an abnormal sample when the number of samples exceeds the predetermined value; a storage unit that stores the reference value, the set time, and a reference frequency characteristic that is a frequency characteristic of a previously collected sound; A frequency analysis unit that analyzes the frequency characteristics of the sample to obtain a sample frequency characteristic, and compares the sample frequency characteristic and the reference frequency characteristic to determine an abnormal sample that is not similar as a dissimilar sample. (2) a determination unit, a display unit for collectively displaying all the dissimilar samples obtained over a certain period, and a digital unit for sequentially outputting audio data obtained by sequentially converting an audio signal output from the audio input unit into digital. A conversion unit, a second storage unit that sequentially discards the oldest audio data stored each time the latest audio data sequentially output by the digital conversion unit is sequentially stored, and a second storage unit that determines that they are not similar. A noise monitoring system, comprising: a demodulation unit that demodulates audio data stored in the second storage unit into an audio signal; and a sound generation unit that outputs the demodulated audio signal. 26. The noise monitoring system according to claim 25, wherein the display unit displays the dissimilar sample and a sample that is not designated as the dissimilar sample. 27. The storage section, wherein the storage section stores a plurality of the set times, and wherein the first determination section executes the determination by the second determination section for the abnormal sample determined by the shortest set time. The noise monitoring system according to claim 25 or 26, wherein 28. The noise monitoring system according to claim 25, wherein the display unit displays the abnormal sample and the dissimilar sample separately. 29. When at least one of the dissimilar samples displayed collectively on the display unit is selected, an audio signal corresponding to the selected dissimilar sample is output from the sounding unit. Item 25, 26, 27 or 28
A noise monitoring system according to item 1. 30. The noise level acquiring unit acquires at least three types of noise level samples, that is, a time rate noise level, an equivalent noise level, and a short-time noise level. 27. The method according to claim 25, wherein the determination is performed for each sample of the noise level of the type, and the second determination unit performs the determination of the similarity for each sample of the noise level of the short-time noise. 27,
30. The noise monitoring system according to 28 or 29. 31. The storage device according to claim 25, wherein the storage unit stores the acquired sample frequency characteristic of the dissimilar sample as the reference frequency characteristic.
30. The noise monitoring system according to 9 or 30. 32. The audio input unit, comprising: a microphone; an amplifier for amplifying an output signal of the microphone to output an amplified signal; and a plurality of conductors connected to the amplifier and transmitting the amplified signal. A line pair, and a differential amplifier that performs a differential amplification operation according to the amplified signal transmitted through each conductor of the stranded pair to obtain an output signal, and outputs an output of the differential amplifier to the audio signal. 27. An output as the following.
32. The noise monitoring system according to 8, 29, 30 or 31. 33. An amplifier for amplifying an input signal and outputting an amplified signal, a stranded wire pair including a plurality of conductors connected to the amplifier for transmitting the amplified signal, and respective conductors of the stranded wire pair And a differential amplifier that obtains an output signal by performing a differential amplification operation according to the amplified signal transmitted.