JP3995040B2 - Sound recording method and apparatus using the same in noise vibration measurement - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound recording method that requires identification in noise vibration measurement and an apparatus using the same.
[0002]
[Prior art]
Conventionally, when measuring noise and vibration for a long time, the actual sound monitoring system equipped with a recording function is used to record the on-site sound as needed, and this sound can be heard later to confirm that it is unnecessary. It is known to determine whether or not noise level or vibration level when unnecessary sound is generated is excluded from measurement data.
[0003]
In the case of automatic measurement, a certain condition is set before measurement, and recording is started when a certain condition is satisfied. For example, as shown in FIG. 7 (a), recording starts when the sampling value (instantaneous value) Lp of the noise level exceeds a set level Lr (Lp> Lr), or as shown in FIG. 7 (b). As shown, recording was performed for a certain time t21 (for example, 15 seconds) at regular time intervals t20 (for example, 5 minutes).
[0004]
[Problems to be solved by the invention]
However, in the method of starting recording when the noise level sampling value Lp exceeds a certain set level Lr (Lp> Lr), or recording only for a certain time t21 at a certain time interval t20, in advance, Appropriate setting values (Lr, t20, t21, etc.) need to be determined, and in order to determine these setting values, some experience and know-how are required.
In addition, even if these settings are determined and measurement is started, long-term noise and vibration measurement cannot respond to environmental changes during measurement and may not be able to completely record sound that requires identification. There was a problem.
[0005]
The present invention has been made in view of such problems of the prior art, and the object of the present invention is to provide a sound that requires identification according to changes in the measurement environment without relying on experience or know-how. It is an object of the present invention to provide a sound recording method and a device using the sound recording method for noise vibration measurement that can be recorded.
[0008]
The invention according to claim 1 is a sound recording method that requires identification in noise vibration measurement, which is measured within a certain measurement time in the past, and two types of time for noise levels that are updated at certain time intervals. The rate noise level Lx is calculated at every certain time interval, and if the difference between them is smaller than a predetermined value, recording is performed for a predetermined time.
[0009]
The invention according to claim 2 is a sound recording method that requires identification in noise vibration measurement, and is a time rate noise level for a noise level that is measured within a certain past measurement time and updated every certain time interval. Lx and the equivalent noise level Leq are calculated for each certain time interval, and when the difference between them is smaller than a predetermined value, recording is performed for a predetermined time.
[0010]
The invention according to claim 3 is a sound recording method that requires identification in noise vibration measurement, in which temporary recording is always performed, and two kinds of time rate noise levels Lx are calculated for the noise level measured at every measurement time. The recording data of the recording section in which the difference between them is smaller than a predetermined value is validated.
[0011]
The invention according to claim 4 is a sound recording method that requires identification in noise vibration measurement, in which temporary recording is always performed, and the time rate noise level Lx and the equivalent noise level Leq are obtained for the noise level measured at every measurement time. Calculate and validate the recording data of the recording section where the difference between them is smaller than a predetermined value.
[0012]
The invention according to claim 5 is a sound level meter or vibration meter, processing means for calculating and processing noise or vibration measurement value data and sound signals output by the sound level meter or vibration meter, and control output by the processing means. The sound recording method in noise vibration measurement according to any one of claims 1 to 4 is applied to an actual sound monitoring system comprising a recording medium for recording the sound signal by a signal.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a block diagram of a sound recording apparatus for noise measurement according to the present invention, FIG. 2 is an explanatory diagram of the first embodiment of the present invention, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is an explanatory diagram of the third embodiment of the present invention, FIG. 5 is an explanatory diagram of the fourth embodiment of the present invention, and FIG. 6 is an explanatory diagram of the fifth embodiment of the present invention. FIG.
[0014]
As shown in FIG. 1, a sound recording apparatus for noise measurement according to the present invention takes in an acoustic signal with a microphone and converts it into an electrical signal, and measures noise-related measured value data, an AC output signal (recorded sound signal), etc. Is output to the sound level meter 1 and the measurement value data output from the sound level meter 1 is processed to output a recording control signal by applying a conditional expression for determining start / stop of recording, and the AC level output from the sound level meter 1 From the processing means 2 for amplifying and outputting the output signal (recorded sound signal) and the recording medium 3 for recording the AC output signal (recorded sound signal) based on the recording control signal output from the processing means 2 Become. In the embodiment of the present invention, the present invention is applied to noise measurement, but it goes without saying that it can be applied to vibration measurement.
[0015]
As shown in FIG. 2, the first embodiment of the sound recording method in noise measurement according to the present invention is measured at a sampling period T (eg, 100 ms) within the past measurement time t1 (eg, 1 minute). The equivalent noise level Leq is calculated every certain time interval t2 (for example, 3 minutes) for the measured noise level, and the noise level sampling value Lp is higher than the equivalent noise level Leq by a predetermined level (for example, 10 dB) (Leq + 10 < Lp) is recorded.
[0016]
When the noise level changes with time, a predetermined level (for example, 10 dB) is set to the equivalent noise level Leq representing the noise level of continuous stationary sound having energy equal to the noise level within the measurement time t1 (for example, 1 minute). By adding, it becomes easy to determine whether or not the noise level sampling value Lp has increased due to the presence of unnecessary sound. Accordingly, while satisfying the conditional expression (Leq + 10 <Lp), recording is performed assuming that a sound requiring identification is generated.
[0017]
As shown in FIG. 3, the second embodiment of the sound recording method for noise measurement according to the present invention is measured at a sampling period T (eg, 100 ms) within the past measurement time t3 (eg, 1 minute). Two kinds of time rate noise levels Lx (for example, L5 and L95) are obtained at certain time intervals t4 (for example, 3 minutes), and the difference (L5−L95) is a predetermined value (for example, 8 dB). If it is smaller (L5−L95 <8), recording is performed only for a predetermined time t5 (for example, 15 seconds). Here, the time rate noise level Lx used is arbitrary and can be changed according to the measurement environment.
[0018]
5% time rate noise level L5 (represents the level when the noise level is 5% or more of the measurement time t3) and 95% time rate noise level L95 (the noise level is above a certain level) When a certain period of time occupies 95% of the measurement time t3, the level is expressed), thereby making it easy to determine whether or not the noise in a certain section is stationary. Therefore, when the conditional expression (L5−L95 <8) is satisfied, it is regarded that a sound requiring identification is generated, and recording is performed for a predetermined time t5 (for example, 15 seconds).
[0019]
As shown in FIG. 4, the third embodiment of the sound recording method for noise measurement according to the present invention is measured at a sampling period T (eg, 100 ms) within the past measurement time t6 (eg, 1 minute). The time rate noise level Lx (for example, L50) and the equivalent noise level Leq are obtained every certain time interval t7 (for example, 3 minutes), and the difference (L50−Leq) is a predetermined value (for example, 8 dB). If it is smaller (L50−Leq <8), recording is performed only for a predetermined time t8 (for example, 15 seconds).
[0020]
50% time rate noise level L50 (represents the level when the noise level occupies 50% of the measurement time t5 over a certain level) and continuous with energy equal to the noise level within the measurement time t5 By determining the difference between the equivalent noise levels Leq representing the noise level of the stationary sound, it is easy to determine whether or not the noise in a certain section is stationary. Accordingly, when the conditional expression (L50−Leq <8) is satisfied, it is considered that a sound requiring identification is generated, and recording is performed for a predetermined time t8 (for example, 15 seconds).
[0021]
As shown in FIG. 5, the fourth embodiment of the sound recording method in the noise measurement according to the present invention always performs temporary recording, and performs a sampling period T (for example, every measurement time t9 (for example, 20 seconds)). Two kinds of time rate noise levels Lx (for example, L5 and L95) are obtained for the noise level measured at 100 ms), and the difference (L5−L95) is smaller than a predetermined value (for example, 8 dB) (L5−L95 <8). ) The recording data in the recording section is made effective. Here, the time rate noise level Lx used is arbitrary and can be changed according to the measurement environment.
[0022]
By determining the difference between the 5% time rate noise level L5 and the 95% time rate noise level L95, it is easy to determine whether or not the noise in a certain section is stationary. Therefore, when the conditional expression (L5−L95 <8) is satisfied, it is considered that a sound that needs to be identified is generated, and the recording data of the recording section is stored as valid.
[0023]
As shown in FIG. 6, the fifth embodiment of the sound recording method in the noise measurement according to the present invention always performs temporary recording, and performs a sampling period T (for example, every measurement time t10 (for example, 20 seconds)). When the time rate noise level Lx (for example, L50) and the equivalent noise level Leq are obtained for the noise level measured at 100 ms) and the difference (L50−Leq) is smaller than a predetermined value (for example, 8 dB) (L50−Leq < In 8), the recording data of the recording section is made valid. Here, the time rate noise level Lx used is arbitrary and can be changed according to the measurement environment.
[0024]
By determining the difference between the 50% time rate noise level L50 and the equivalent noise level Leq, it is easy to determine whether or not the noise in a certain section is stationary. Therefore, when the conditional expression (L50−Leq <8) is satisfied, it is considered that a sound that needs to be identified is generated, and the recording data of the recording section is stored as valid.
[0025]
In the first to fifth embodiments of the present invention, the noise level sampling value Lp, the equivalent noise level Leq, and the time rate noise are used as data (measurement values) for determining the sound that needs to be identified. Although the level Lx is used, the maximum value Lmax, the minimum value Lmin, the peak sound pressure level Lpk, and the like of the noise level can also be used.
[0026]
Further, the conditional expression for determining whether recording is possible is not limited to one expression as in the above embodiment, and may be a plurality of expressions. For example, the four conditional expressions (Lp> L1), (Leq + 10 <Lp), (L5−L95 <8), and (L50−Leq <8) are used as the conditional expressions, and the identification is made only when these four expressions are all satisfied. It can be recorded as a sound that needs to be recorded. In addition, when one of the four formulas is satisfied, it may be recorded as a sound that requires identification. When two or three of the four formulas are established, recording may be performed. You can also.
[0027]
In addition, the conditional expression and data (measured values) used for determining whether recording is possible may be changed according to the situation. For example, at the start of measurement, α1 and α2 are used as conditional expressions and β1 and β2 are used as data. However, when the conditional expressions α and α2 are satisfied, α3 and α4 are used as conditional expressions, and β3 and β4 are used as data. use. In this way, by changing the conditional expression and data used according to the situation, it is possible to perform noise vibration measurement applied to changes in the measurement environment.
[0028]
Further, αx (βx (n), βx (n-1)) is calculated from the past measurement value βx (n) and the past measurement value βx (n-1), and the start and stop of recording are determined. You can also. Here, n is the nth time sample, and n-1 means the previous measured value. Of course, like αz (βz (n), αz (n-1)), the value obtained by the previous calculation is used as the measured value (input value) in the same way as the measured value βz in the next calculation. May be used. In this manner, by changing the conditional expression for dynamically determining the start and stop of recording and the measurement value (input value) throughout the measurement period, it is possible to perform noise vibration measurement applied to changes in the measurement environment.
[0031]
According to the first aspect of the present invention, two kinds of time rate noise levels Lx are calculated for the noise level, and when the difference between them is smaller than a predetermined value, recording is performed for a predetermined time. You can record.
Further, since waste of recording time is reduced, post-processing work can be made more efficient.
[0032]
According to the second aspect of the present invention, the time rate noise level Lx and the equivalent noise level Leq are calculated for the noise level, and when the difference between them is smaller than a predetermined value, recording is performed for a predetermined time. It can be recorded reliably.
Further, since waste of recording time is reduced, post-processing work can be made more efficient.
[0033]
According to the invention of claim 3 , provisional recording is always performed, two kinds of time rate noise levels Lx are calculated for the noise level measured at every measurement time, and the difference between them is smaller than a predetermined value. Since the recorded data is made effective, it is possible to reliably record a sound that requires identification.
Further, since waste of recording time is reduced, post-processing work can be made more efficient.
[0034]
According to the fourth aspect of the invention, the time rate noise level Lx and the equivalent noise level Leq are calculated for the noise level, and the recorded data in the recording section in which the difference between them is smaller than a predetermined value is validated. The necessary sound can be recorded reliably.
Further, since waste of recording time is reduced, post-processing work can be made more efficient.
[0035]
According to the fifth aspect of the present invention, it is possible to configure an apparatus that reliably records sound that requires identification by applying to changes in the measurement environment without relying on experience or know-how.
Further, since waste of recording time is reduced, post-processing work can be made more efficient.
[Brief description of the drawings]
FIG. 1 is a block diagram of a sound recording apparatus in noise measurement according to the present invention. FIG. 2 is an explanatory diagram of a first embodiment of the present invention. FIG. 3 is an explanatory diagram of a second embodiment of the present invention. FIG. 4 is an explanatory diagram of a third embodiment of the present invention. FIG. 5 is an explanatory diagram of a fourth embodiment of the present invention. FIG. 6 is an explanatory diagram of a fifth embodiment of the present invention. 7A and 7B are explanatory diagrams of a sound recording method in conventional noise vibration measurement, in which FIG. 7A is a case where recording is performed with a set level, and FIG. ]
DESCRIPTION OF SYMBOLS 1 ... Sound level meter, 2 ... Processing means, 3 ... Recording medium, Leq ... Equivalent noise level, Lp ... Noise level sampling value (instantaneous value), Lx ... Time rate noise level.

Claims (5)

  A sound recording method that requires identification in noise vibration measurement, wherein two kinds of time rate noise levels Lx are measured for a certain time for a noise level that is measured within a certain past measurement time and updated every certain time interval. A sound recording method in noise vibration measurement, wherein the sound is calculated for each interval, and when the difference is smaller than a predetermined value, recording is performed for a predetermined time.   A sound recording method that requires identification in noise vibration measurement, wherein a time rate noise level Lx and an equivalent noise level Leq are measured for a noise level that is measured within a certain past measurement time and updated every certain time interval. A sound recording method in noise vibration measurement, characterized in that the sound is calculated at certain time intervals and is recorded only for a predetermined time when the difference between them is smaller than a predetermined value.   This is a sound recording method that requires identification in noise vibration measurement. Temporary recording is always performed, two kinds of time rate noise levels Lx are calculated for the noise level measured at every measurement time, and the difference between them is a predetermined value. A method for recording sound in noise vibration measurement, characterized by enabling recording data in a smaller recording section.   This is a sound recording method that requires identification in noise vibration measurement. Temporary recording is always performed, and the time rate noise level Lx and equivalent noise level Leq are calculated for the noise level measured at every measurement time, and the difference between them is predetermined. A method for recording sound in noise vibration measurement, characterized by enabling recording data in a recording section that is smaller than the value of. Sound level meter or vibration level meter, processing means for calculating and processing noise or vibration measurement value data and sound signal output from the sound level meter or vibration level meter, and recording the sound signal by a control signal output from the processing level A sound recording apparatus for noise vibration measurement, wherein the sound recording method for noise vibration measurement according to any one of claims 1 to 4 is applied to an actual sound monitoring system comprising a recording medium.

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