JP7432893B2 - Sound insulation performance measurement method and sound insulation performance measurement system - Google Patents

Description

The present invention relates to a sound insulation performance measurement method for measuring and understanding the air sound insulation performance of a building to which high sound insulation performance specifications are applied, and a sound insulation performance measurement system that utilizes the method.

Conventionally, to measure the airborne sound insulation performance of buildings with high sound insulation performance specifications, for example, a method based on JIS A 1417:2000 "Method for measuring airborne sound insulation performance of buildings" shown in Non-Patent Document 1 (hereinafter referred to as , also simply referred to as a "method based on JIS"), a method based on impulse response measurement, etc. are used. The method based on JIS outputs a test sound (pink noise) that is stationary and has a continuous spectrum over the entire frequency range to be measured, and from the measurement results for each 1/3 octave band or 1 octave band center frequency, The sound insulation performance is determined by calculating the difference in sound pressure level between the sound-receiving room and the sound-receiving room. The method based on impulse response measurement calculates the single sound pressure exposure level from the square integral value of the response when an impulse is input into the space, and calculates the sound insulation performance by taking the difference between the sound source room and the sound receiving room. It is something. In particular, the swept-sine method is widely used in Japan, and for example, for each band of one octave band center frequency, measurements are sometimes performed for each band using a test sound that is shifted from the lower limit frequency to the upper limit frequency. .

Japanese Industrial Standards JIS A 1417:2000 "Method for measuring airborne sound insulation performance of buildings"

Here, as a basic matter in performing acoustic measurements, it is necessary to ensure a sufficiently large ratio (S/N) of the test sound to unnecessary background noise included in the measurement results. In measurements to evaluate sound insulation performance, the higher the frequency band, the better the sound insulation performance of the building, so the higher the frequency band, the more susceptible it is to background noise. For this reason, attention must be paid to the S/N ratio, especially in the high frequency band measured in the sound receiving room. The JIS-based method described above measures pink noise by radiating it into the space over the entire measurement target frequency range, so it is possible to evaluate sound insulation performance in low frequency bands that are not easily affected by background noise, but it is possible to evaluate sound insulation performance in high frequency bands. There is a problem in that the higher the band, the more susceptible it is to background noise, making evaluation impossible.

On the other hand, in methods based on impulse response measurements such as the swept-sine method, the influence of background noise in the space depends on the length of the test sound signal, so adjusting the signal length can improve the performance of high frequency bands. Sound insulation performance can be evaluated by measuring even sound. However, in order to reduce the influence of background noise, there is a tendency for the length of test sounds, especially in high frequency bands, to become longer, which poses a problem in that the measurement time becomes longer.
The present invention has been made in view of the above problems, and its purpose is to efficiently measure the sound insulation performance of the entire frequency band to be measured while suppressing the measurement time.

(Aspects of the invention)
The following embodiments of the invention are intended to exemplify the configuration of the present invention, and will be explained separately in order to facilitate understanding of the various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the constituent elements of each section may be replaced, deleted, or further modified while taking into consideration the best mode for carrying out the invention. Components to which the above components are added may also be included within the technical scope of the present invention.

(1) To evaluate the air sound insulation performance of a building to which high sound insulation performance specifications are applied, test sounds output from a sound source room inside the building are collected in both the sound source room and a sound receiving room inside the building. A method of measuring and grasping each of a plurality of measurement frequency bands by using the difference between the test sounds, wherein at least one set of center frequencies is selected from a plurality of center frequencies that define the plurality of measurement frequency bands. After setting an output frequency band for output wider than the corresponding measurement frequency band for each of the two center frequencies included in each selected set, the two output frequencies corresponding to the two center frequencies are set. A method for measuring sound insulation performance (claim 1) comprising impulse response measurement in which a synthetic impulse test sound obtained by synthesizing band signals is output, and a response of the output is analyzed for each measurement frequency band corresponding to the two center frequencies.

The sound insulation performance measurement method described in this section is a method to understand the air sound insulation performance of a building to which high sound insulation performance specifications are applied by measuring it for each of multiple measurement frequency bands, and outputs a synthetic impulse test sound. Includes impulse response measurements. That is, in the impulse response measurement of the present sound insulation performance measurement method, at least one set of center frequencies to be used as a synthesis target of the test sound is selected from a plurality of center frequencies that define a plurality of measurement frequency bands to be measured. Then, for each of the two center frequencies included in each selected set, an output frequency band for outputting as a test sound is set separately from the corresponding measurement frequency band.

In other words, in addition to the measurement frequency band for measurement, an output frequency band for output is set for each of the center frequencies selected for synthesis of the test sound, and at this time, the measurement frequency band that includes the measurement frequency band is set. Set the output frequency band to a wider band than . Then, the signals of two output frequency bands corresponding to the two center frequencies included in each selected set are synthesized and output as the above-mentioned synthesized impulse test sound in the sound source room in the building. Sound is collected and measured both in the internal sound receiving room and in the sound receiving room. During this measurement, analysis is performed for each measurement frequency band corresponding to the two center frequencies of each set of synthesized test sounds, and the single sound pressure exposure level is calculated. The difference between the analysis results is used to understand the sound insulation performance for each measurement frequency band.

As a result, instead of outputting a test sound for each measurement frequency band of the measurement target and performing measurements, it is possible to perform measurements by outputting a synthesized test sound for each selected set. Compared to other methods, the measurement time is shortened. Moreover, due to the band adjustment when setting the output frequency band wider than the measurement frequency band, it does not affect the analysis performed for each measurement frequency band, but it causes problems when combining the signals of the two output frequency bands. This is to avoid doing so. Therefore, the sound insulation performance of the entire frequency band to be measured can be efficiently measured while reducing the measurement time.

(2) In item (1) above, the impulse response measurement uses the swept-sine method, and the two output frequency bands corresponding to the two center frequencies are set to the lower limit of one of the output frequency bands. A sound insulation performance measuring method (claim 2) in which the frequency and upper limit frequency are set to be three times as large as the lower limit frequency and upper limit frequency of the other output frequency band.
The sound insulation performance measurement method described in this section uses the swept-sine method to perform impulse response measurements. Each signal has a waveform like a sine wave that shifts from the lower limit frequency to the upper limit frequency and continues until the end of the signal. If such two signals are combined as they are, the amplitude of the parts where the peaks and valleys of the signals overlap will become large, which may cause the sound to be distorted when output, or the output may be distorted. There is a risk that equipment used for this purpose may be destroyed. Furthermore, if the output volume of the synthesized test sound is reduced in order to avoid this, the components of the test sound radiated into the space will be reduced, making it more susceptible to background noise and making it impossible to evaluate sound insulation performance. There is also a possibility.

Therefore, in the sound insulation performance measurement method described in this section, two output frequency bands corresponding to the two center frequencies of each set to be synthesized are set so that the lower limit frequency and upper limit frequency of one output frequency band are the same as the output frequency of the other output frequency band. The frequency is set to be three times as large as the lower limit frequency and upper limit frequency of the frequency band. This prevents the peaks and troughs of the signals from directly overlapping even if the signals of the two output frequency bands are combined, and the magnitude of the amplitude of the combined signal is suppressed. It is something. Therefore, even if the output volume of the synthetic impulse test sound synthesized in this way is increased, there will be no problem because many of the test sound components will be radiated into the space without causing sound distortion or damage to the output device. Sound insulation performance will be measured.

(3) In items (1) and (2) above, pink noise measurement is performed by outputting a pink noise test sound covering all of the plurality of measurement frequency bands, and analyzing the sound collection results of the output for each measurement frequency band of the measurement target. dividing the plurality of measurement frequency bands into two, a low frequency band and a high frequency band, performing measurement of a measurement frequency band belonging to the low frequency band by the pink noise measurement, and performing measurement of a measurement frequency band belonging to the high frequency band. A sound insulation performance measuring method (claim 3), wherein the measurement of the measurement frequency band is performed by the impulse response measurement.

The sound insulation performance measurement method described in this section includes pink noise measurement in addition to impulse response measurement. In this pink noise measurement, a pink noise test sound covering all of multiple measurement frequency bands is output in a sound source room. , this output is collected in both the sound source room and the sound receiving room. Furthermore, the sound pressure level is calculated by analyzing the sound collection results for each measurement frequency band of the pink noise measurement target, and the difference in the analysis results between the sound source room and the sound receiving room in each measurement frequency band is used. This is to understand the sound insulation performance for each measurement frequency band. In the sound insulation performance measurement method described in this section, the multiple measurement frequency bands to be measured are divided into two: a low frequency band that is not easily affected by background noise, and a high frequency band that is easily affected by background noise. One is measured by pink noise measurement and the other by impulse response measurement.

That is, the measurement frequency band belonging to the low frequency band is measured by pink noise measurement, and the measurement frequency band belonging to the high frequency band is measured by impulse response measurement. As a result, pink noise measurement is not suitable for high frequency bands that are easily affected by background noise, but can be used to measure low frequency bands that are not easily affected by background noise. The measurements will be performed all at once. Furthermore, the measurement of the remaining measurement frequency bands belonging to the high frequency band that is susceptible to background noise is carried out by impulse response measurement in which a synthesized impulse test sound is output for each selected set, as described in item (1) above. carried out by. Therefore, the total measurement time for measuring the sound insulation performance of the measurement frequency band of the measurement target can be further shortened, and the measurement can be performed more efficiently.

(4) In the above item (3), the plurality of measurement frequency bands include measurement frequency bands having center frequencies of 125 Hz, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz, and by the pink noise measurement, A measurement frequency band with a center frequency of 125 Hz and a measurement frequency band with a center frequency of 250 Hz are measured, and the impulse response measurement results in a set with the two center frequencies of 500 Hz and 2000 Hz, and a set with the two center frequencies of 1000 Hz and 4000 Hz. A method for measuring sound insulation performance (claim 4), in which two sets are selected, a set having two center frequencies, and a measurement is performed for each of the selected sets.

The sound insulation performance measurement method described in this section includes measurement frequency bands whose center frequencies are 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, and 4000Hz for each octave band as a plurality of measurement frequency bands to be measured. It is something that Then, the measurement frequency bands with center frequencies of 125 Hz and 250 Hz are divided into low frequency bands to be measured by pink noise measurement, and the measurement frequency bands with center frequencies of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz are divided into low frequency bands to be measured by pink noise measurement. It is separated into high frequency bands which are measured by impulse response measurements. Accordingly, the pickup results of pink noise test sounds across multiple measurement frequency bands were analyzed in the measurement frequency band with a center frequency of 125Hz and the measurement frequency band with a center frequency of 250Hz, and the sound of 125Hz and 250Hz was analyzed. Calculate the pressure level and perform pink noise measurements in the low frequency band.

On the other hand, in impulse response measurement, a set of center frequencies of 500 Hz and 2000 Hz is selected as a set of two center frequencies for signal synthesis, and a set of center frequencies of 1000 Hz and 4000 Hz is selected as a set of two center frequencies for signal synthesis. Selected as a group of Further, for each of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz, an output frequency band wider than the corresponding measurement frequency band is set. Then, a synthesized impulse test sound is produced by combining a signal in an output frequency band with a center frequency of 500 Hz and a signal in an output frequency band with a center frequency of 2000 Hz, and the response of this output is converted into a measurement frequency band with a center frequency of 500 Hz. and a measurement frequency band with a center frequency of 2000 Hz.

Similarly, output a synthetic impulse test sound that combines a signal in an output frequency band with a center frequency of 1000 Hz and a signal in an output frequency band with a center frequency of 4000 Hz, and calculate the response of this output as a measurement frequency with a center frequency of 1000 Hz. and a measurement frequency band with a center frequency of 4000 Hz. In this way, the single sound pressure exposure level of each of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz is calculated, and the impulse response measurement in the high frequency band is performed. As a result, the measurement frequency band whose center frequency is one octave band can be divided into a low frequency band where the characteristics of pink noise measurement are utilized and a high frequency band where the characteristics of impulse response measurement are utilized. , can be executed efficiently and in a short time.

(5) In the above item (4), the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 500 Hz are set to 353 Hz and 943 Hz, and the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 2000 Hz. 1059Hz and 2829Hz, the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 1000Hz are set to 707Hz and 1886Hz, and the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 4000Hz are set to 2121Hz and 5658Hz. A method for measuring sound insulation performance (claim 5).

The sound insulation performance measurement method described in this section is based on the output frequency bands whose center frequencies are 500Hz, 1000Hz, 2000Hz, and 4000Hz, which are the targets of impulse response measurement as described in section (4) above. It is defined within an appropriate range found through trial and error by the inventors. Specifically, the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 500 Hz are set to 353 Hz and 943 Hz, and the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 2000 Hz are set to 1059 Hz and 2829 Hz. do. As a result, the output frequency band with a center frequency of 2000 Hz is set to be three times as large as the output frequency band with a center frequency of 500 Hz to which it is combined.

Further, the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 1000 Hz are set to 707 Hz and 1886 Hz, and the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 4000 Hz are set to 2121 Hz and 5658 Hz. As a result, the output frequency band with a center frequency of 4000 Hz is set to be three times as large as the output frequency band with a center frequency of 1000 Hz to which it is combined. By doing this, even when performing impulse response measurements using the swept-sine method, etc., the amplitude of the synthesized signal is suppressed, so the sound insulation performance in the high frequency band can be measured without any problems. become something that

(6) In items (1) and (2) above, a plurality of sets of center frequencies are selected by the impulse response measurement so as to cover all of the plurality of center frequencies, and measurement is performed for each of the selected sets. Sound insulation performance measuring method (claim 6).
The sound insulation performance measurement method described in this section selects multiple sets of center frequencies for synthesizing signals so as to cover all of the multiple center frequencies that define the multiple measurement frequency bands of the measurement target. The sound insulation performance of the measurement target in all measurement frequency bands is measured by impulse response measurement. As a result, even though only impulse response measurement is used as the measurement method, a synthetic impulse test sound in which signals in two output frequency bands are synthesized is used in each set of measurements, resulting in the measurement of the measurement target. The measurement time for the entire frequency band is reduced.

(7) A system for measuring the airborne sound insulation performance of a building to which high sound insulation performance specifications are applied, using the sound insulation performance measurement method described in any one of items (3) to (5) above. , an output device installed in the sound source room for outputting a test sound, a sound collection device installed in both the sound source room and the sound receiving room for collecting the test sound, and the output device and a control device connected to the sound collection device, the control device outputting the synthesized impulse test sound from the output device and using the result of the sound collection from the sound collection device to generate the impulse response. Sound insulation comprising: an impulse response measurement unit that performs measurement; and a pink noise measurement unit that outputs the pink noise test sound from the output device and performs the pink noise measurement using the result of the sound collection from the sound collection device. Performance measurement system (claim 7).

The sound insulation performance measurement system described in this section uses the sound insulation performance measurement method of any one of the above (3) to (5) to measure the air sound insulation performance of buildings to which high sound insulation performance specifications are applied. It measures the sound, and includes an output device, a sound collection device, and a control device. The output device is for outputting test sounds used in each measurement method, and is installed in the sound source room of the building to be measured. The sound collection device is for collecting the test sound output from the output device, and is installed in both the sound source room and the sound reception room of the building to be measured. The control device is connected to the output device and the sound collection device, and includes an impulse response measurement section and a pink noise measurement section. The impulse response measurement unit is a part that performs impulse response measurement, and outputs a synthesized impulse test sound in which signals of two output frequency bands are synthesized from the output device, and the response result is collected via the sound pickup device. is analyzed for each of the two measurement frequency bands corresponding to the combined signal.

The pink noise measurement unit is a part that performs pink noise measurement, and outputs pink noise test sounds covering a plurality of measurement frequency bands from an output device, and collects the sound through a sound pickup device. Analyze each measurement frequency band of the pink noise measurement target. Because of this configuration, the measurement of the measurement frequency band belonging to the low frequency band is performed by the pink noise measurement section, and the measurement of the measurement frequency band belonging to the high frequency band is performed by the impulse response measurement section, as appropriate. Parts can be switched. As a result, the sound insulation performance of multiple measurement frequency bands can be efficiently measured in a short time, for example, according to an arbitrarily set execution order, while achieving the same effect as the sound insulation performance measurement method in items (3) to (5) above. It will be well measured.

Since the present invention has the above configuration, it is possible to efficiently measure the sound insulation performance of the entire frequency band of the measurement target while suppressing the measurement time.

1 is an image configuration diagram showing an example of the configuration of a sound insulation performance measurement system according to an embodiment of the present invention, together with an example of a floor plan of a building to be measured. It is a flow chart showing an example of a procedure of a sound insulation performance measuring method concerning an embodiment of the present invention. It is a table showing a plurality of measurement frequency bands of measurement targets and their center frequencies. 3 is a table showing output frequency bands and their center frequencies set in impulse response measurement. FIG. 3 is a waveform diagram showing an example of synthesis of a synthetic impulse test sound output in impulse response measurement. FIG. 3 is a waveform diagram showing a comparative example of a synthetic impulse test sound.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described based on the accompanying drawings. Here, detailed explanations of the same parts or corresponding parts as in the prior art will be omitted, and the same parts or corresponding parts are indicated by the same reference numerals throughout the drawings.
FIG. 1 schematically shows the configuration of a sound insulation performance measurement system 10 according to an embodiment of the present invention, which measures the air sound insulation performance of a building 50 to which high sound insulation performance specifications are applied. In addition, the building 50 has a sound source room 52 used for outputting and collecting the test sound, and a sound receiving room 54 used for collecting the test sound, so that the sound insulation performance can be appropriately evaluated. It is assumed that the location has been selected in advance.

As illustrated, the sound insulation performance measurement system 10 according to the embodiment of the present invention includes an output device 12, a power amplifier 14, a plurality of sound collection devices 20, a plurality of microphone amplifiers 24, an audio interface 30, and a control device 40. Contains. The power amplifier 14 amplifies the signal sent from the control device 40, and the output device 12 is installed in the sound source room 52 of the building 50, and outputs the signal amplified by the power amplifier 14 as a test sound to the sound source room. 52. Any power amplifier device may be used as the power amplifier 14, and any speaker may be used as the output device 12.

The plurality of sound collection devices 20 are for collecting the test sound output from the output device 12, and in this embodiment, two sound collection devices 20A and 20B are installed in the sound source room 52. The sound devices 20C and 20D are installed in the sound receiving room 54, and a total of four sound collecting devices 20A to 20D are installed in the building 50. The plurality of microphone amplifiers 24 amplify the sound collected by the sound collection device 20 and send it to the control device 40. In this embodiment, the plurality of microphone amplifiers 24 are connected one-to-one with the sound collection device 20. Four microphone amplifiers 24A to 24D are installed. Any microphone may be used for the sound collection device 20, and any microphone amplifier device may be used for the microphone amplifier 24.

The audio interface 30 is arranged between the power amplifier 14 and the plurality of microphone amplifiers 24 and the control device 40, and is used to ensure a physical connection configuration between them. Therefore, any interface device is used as the audio interface 30 depending on the number of microphone amplifiers 24 (sound collection device 20), the interface configuration of the devices constituting the control device 40, and the like. Note that the power amplifier 14, the plurality of microphone amplifiers 24, the audio interface 30, and the control device 40 may be installed at arbitrary positions depending on the installation positions of the output device 12 and the sound collection device 20.

The control device 40 controls the entire sound insulation performance measurement system 10, and is connected to the output device 12 and the sound collection device 20 via the audio interface 30, the power amplifier 14, and the microphone amplifier 24, as described above. has been done. The control device 40 also includes an impulse response measurement section 42 and a pink noise measurement section 44. The impulse response measurement unit 42 is a part for performing impulse response measurement using the output device 12, the sound collection device 20, etc. described above, although the details will be described later. The pink noise measurement section 44 is a section for performing pink noise measurement using the above-mentioned output device 12, sound collection device 20, etc., which will be described in detail later. Any computer equipment such as a personal computer is used as the control device 40.

Here, the configuration of the sound insulation performance measurement system 10 according to the embodiment of the present invention is not limited to the configuration shown in FIG. 1, but may be configured as shown in FIG. The configuration may be such that some of the elements are deleted, changed, or added as appropriate. For example, depending on the configuration of the control device 40, the audio interface 30 may not be used, and the number of sound pickup devices 20 and microphone amplifiers 24 may be greater or less than four. Furthermore, each part of the control device 40 shown in FIG. 1 is divided into functional units, and is not divided into hardware units such as computers actually used. Hardware and software configurations may be applied. Furthermore, any connection method depending on the equipment constituting each component can be used to connect the components shown in FIG.

Next, a sound insulation performance measurement method according to an embodiment of the present invention that uses the sound insulation performance measurement system 10 shown in FIG. 1 will be described along the flowchart shown in FIG. 2. For the configurations of the sound insulation performance measurement system 10 and the building 50, see FIG. 1 as appropriate. Note that the flowchart shown in FIG. 2 shows an example of a procedure flow for explaining the sound insulation performance measuring method according to the embodiment of the present invention. Therefore, the sound insulation performance measurement method is not limited to this flowchart. For example, some of the steps shown in FIG. 2 may be deleted, changed, or changed depending on the configuration and situation of the sound insulation performance measurement system 10. The flow may be added as appropriate.

S10 (measurement method assignment): A worker or the like who executes the measurement assigns a measurement method to be executed to each of the plurality of measurement frequency bands to be measured. That is, the sound insulation performance measuring method according to the embodiment of the present invention includes impulse response measurement and pink noise measurement as measurement techniques, and one of these measurement techniques is assigned to each measurement frequency band. Here, in this embodiment, six measurement frequency bands having six center frequencies (125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, and 4000Hz) for each octave band as shown in FIG. Performance shall be measured.

Specifically, first, the six measurement frequency bands are divided into a low frequency band and a high frequency band, pink noise measurement is assigned to the measurement frequency band belonging to the low frequency band, and impulse response is assigned to the measurement frequency band belonging to the high frequency band. Assign measurements. In this embodiment, two measurement frequency bands with center frequencies of 125 Hz and 250 Hz are divided into low frequency bands in which pink noise measurement is performed, and the remaining 4 measurement frequency bands with center frequencies of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz are divided. the two measurement frequency bands into higher frequency bands in which impulse response measurements are performed. These assignment results are then input to the control device 40 by a worker or the like. Note that the lower limit frequency and upper limit frequency of each of the measurement frequency bands shown in FIG. 3 are values derived from the center frequency and the like using a formula recommended by a measuring instrument manufacturer.

S20 (selection of measurement method to be executed): An operator or the like selects one of the measurement methods, pink noise measurement and impulse response measurement, which has not been executed yet, as the execution target. In other words, if you have already performed pink noise measurement, select impulse response measurement, if you have already performed impulse response measurement, select pink noise measurement, and if you have not performed either measurement method, select either. or arbitrarily select one. As a result, if pink noise measurement is selected, the process moves to S30 (arrow on the "pink noise" side in Figure 2), and if impulse response measurement is selected, the process moves to S70 (arrow on the "impulse" side in Figure 2). do. Note that this selection result may be input to the control device 40.

S30 (pink noise test sound output): The pink noise measuring section 44 of the control device 40 causes the output device 12 in the sound source chamber 52 to output a pink noise test sound via the audio interface 30 and the power amplifier 14. In this embodiment, pink noise measurement is performed in a measurement frequency band classified into low frequency bands in accordance with JIS A 1417:2000, a Japanese industrial standard, "Method for Measuring Airborne Sound Blocking Performance of Buildings." Therefore, a test sound having a continuous spectrum over the six measurement frequency bands shown in FIG. 3 is outputted from the output device 12 as a pink noise test sound. Note that this step S30 to S60, which will be described later, comply with JIS A 1417:2000, and detailed description thereof will be omitted.

S40 (measurement): The pink noise test sound output in S30 is transmitted from the sound pickup devices 20A and 20B in the sound source chamber 52 and the sound pickup devices 20C and 20D in the sound receiving chamber 54 to the microphone amplifiers 24A to 24D and Sound is collected via the audio interface 30 and measured by the pink noise measuring section 44. At this time, at least the sound collection results by the sound collection devices 20A and 20B in the sound source chamber 52 and the sound collection results by the sound collection devices 20C and 20D in the sound reception chamber 54 are measured separately.

S50 (Analysis for each measurement frequency band): The pink noise measurement unit 44 analyzes each of the results measured in S40 above for each measurement frequency band of the pink noise measurement target. In this embodiment, a measurement frequency band with a center frequency of 125 Hz (lower limit frequency is 88.4 Hz and upper limit frequency is 176.8 Hz) as shown in FIG. Analysis is performed using each of the measurement frequency bands (lower limit frequency is 176.8 Hz and upper limit frequency is 353.5 Hz). Then, the sound pressure level in a measurement frequency band with a center frequency of 125 Hz and the sound pressure level in a measurement frequency band with a center frequency of 250 Hz are calculated for each of the sound source chamber 52 and the sound receiving chamber 54.

S60 (sound insulation performance evaluation): The pink noise measuring unit 44 calculates the difference between the sound pressure level in the sound source chamber 52 and the sound pressure level in the sound receiving chamber 54 calculated in S50 above in a measurement frequency band with a center frequency of 125 Hz. and a measurement frequency band with a center frequency of 250 Hz. Then, based on those differences, the sound insulation performance of the building 50 to be measured in a measurement frequency band with a center frequency of 125 Hz and a measurement frequency band with a center frequency of 250 Hz is evaluated.

S70 (set selection): A worker or the like selects a set for synthesizing the test sound in S90, which will be described later, from among the center frequencies of the measurement frequency bands classified into high frequency bands in S10. In this embodiment, 500Hz and 2000Hz are selected as a set of center frequencies that are synthesized with each other from among four center frequencies of 500Hz, 1000Hz, 2000Hz, and 4000Hz, and a set of center frequencies that are synthesized with 1000Hz and 4000Hz are selected. Selected as Then, the selection result is input to the impulse response measurement section 42 of the control device 40. In this embodiment, the impulse response measurement of the measurement frequency band divided into high frequency bands is performed according to the impulse response measurement using the so-called swept-sine method, except that a synthetic impulse test sound to be described later is used. .

S80 (Output frequency band setting): A worker or the like sets an output frequency band for each of the two center frequencies included in each set selected in S70 above to be synthesized and output as a test sound. Specifically, an output frequency band having a lower limit frequency and an upper limit frequency as shown in FIG. 4, for example, is set so as to be wider than the measurement frequency band shown in FIG. 3. That is, the lower limit frequency of an output frequency band with a center frequency of 500 Hz is set to 353 Hz and the upper limit frequency is set to 943 Hz, and the lower limit frequency of an output frequency band with a center frequency of 2000 Hz to be synthesized is set to 1059 Hz and the upper limit frequency to 2829 Hz. do. Also, the lower limit frequency of the output frequency band with a center frequency of 1000 Hz is set to 707 Hz and the upper limit frequency is set to 1886 Hz, and the lower limit frequency of the output frequency band with a center frequency of 4000 Hz to be synthesized is set to 2121 Hz and the upper limit frequency to 5658 Hz. do.

Here, the output frequency band shown in FIG. 4 is a value found by the inventors based on the measurement frequency band of FIG. 3. For example, the lower limit frequency of an output frequency band with a center frequency of 500 Hz is set to 353 Hz by rounding down the lower limit frequency of 353.5 Hz of the measurement frequency band of the same center frequency. The lower limit frequency of the output frequency band with a center frequency of 2000 Hz is set to 1059 Hz, which is three times the lower limit frequency 353 Hz of the output frequency band with a center frequency of 500 Hz. Further, the upper limit frequency of the output frequency band with a center frequency of 2000 Hz is set to 2829 Hz, which is a multiple of 3 that is larger than and closest to the upper limit frequency 2828.4 Hz of the measurement frequency band of the same center frequency. The upper limit frequency of the output frequency band with a center frequency of 500 Hz is set to 943 Hz, which is 1/3 of the upper limit frequency of 2829 Hz of the output frequency band with a center frequency of 2000 Hz.

Similarly, the lower limit frequency of the output frequency band with a center frequency of 1000 Hz is set to 707 Hz, which is the lower limit frequency 707.1 Hz of the measurement frequency band of the same center frequency, rounded down to the decimal point, and 2121 Hz, which is three times as large as that. is set to the lower limit frequency of the output frequency band whose center frequency is 4000 Hz. Furthermore, the upper limit frequency of the output frequency band with a center frequency of 4000 Hz is set to 5658 Hz, which is a multiple of 3 that is larger than and the closest multiple of 5656.8 Hz to the upper limit frequency of the measurement frequency band of the same center frequency, and 1/3 of that The magnitude of 1886 Hz is set as the upper limit frequency of the output frequency band whose center frequency is 1000 Hz. The output frequency band thus set is input to the impulse response measuring section 42.

S90 (synthetic impulse test sound output): The impulse response measurement unit 42 outputs a synthetic impulse test sound from the output device 12 in the sound source chamber 52 via the audio interface 30 and the power amplifier 14. To do this, first, prepare signals with waveforms such as a continuous sine wave from the lower limit frequency to the upper limit frequency for the four output frequency bands shown in Figure 4, as used in impulse response measurement using the swept-sine method. do. For example, when outputting a set of test sounds with center frequencies of 500 Hz and 2000 Hz, a signal in an output frequency band with a center frequency of 500 Hz and a signal in an output frequency band with a center frequency of 2000 Hz are synthesized to generate a composite impulse. Create a composite signal to output the test sound. Similarly, when outputting a set of test sounds with center frequencies of 1000 Hz and 4000 Hz, the signal in the output frequency band with the center frequency of 1000 Hz and the signal in the output frequency band with the center frequency of 4000 Hz are synthesized to generate a composite impulse. All you have to do is create a composite signal to output the test sound.

Fig. 5 shows an example of the signal waveform synthesized in this way, and (a) shows the signal waveform of the output frequency band with the smaller band to be synthesized, and the output frequency of the larger band to synthesize. The signal waveform of the band is shown in (b), and the composite signal waveform obtained by combining these signal waveforms is shown in (c). For reference, FIG. 6(a) shows a comparative example in which signals in a band slightly different from the output frequency band shown in FIG. 4 are synthesized, and FIG. 6(a) shows a comparative example in which signals in the measurement frequency band shown in FIG. 6(b), respectively. Comparing Figures 5 and 6, each waveform of the composite signal in Figure 6 has a greatly amplified amplitude, whereas the waveform of the composite signal in Figure 5(c) has a suppressed amplitude. I can see that it is being done. After creating the composite signal as described above, the created composite signal is sent out from the impulse response measuring section 42 and outputted from the output device 12 as a composite impulse test sound. Note that this step S90 to S130, which will be described later, are performed for each set of center frequencies selected in S70, and detailed explanations are omitted as they follow impulse response measurement using the swept-sine method.

S100 (measurement): The synthesized impulse test sound output in S90 is transmitted from the sound pickup devices 20A and 20B in the sound source chamber 52 and the sound pickup devices 20C and 20D in the sound receiving chamber 54 to the microphone amplifiers 24A to 24D and Sound is collected via the audio interface 30 and measured by the impulse response measuring section 42 . At this time, at least the sound collection results by the sound collection devices 20A and 20B in the sound source chamber 52 and the sound collection results by the sound collection devices 20C and 20D in the sound reception chamber 54 are measured separately.
S110 (Impulse response calculation): The impulse response measurement unit 42 performs signal compression processing used in the Swept-sine method on each of the results measured in S100 above, and calculates an impulse response.

S120 (Analyze for each measurement frequency band): The impulse response measurement unit 42 analyzes each of the results calculated in S110 above for each of the two measurement frequency bands corresponding to the two center frequencies where the signals were synthesized in S90 above. . That is, when a set of test sounds with center frequencies of 500 Hz and 2000 Hz is output in S90 above, the measurement frequency band with a center frequency of 500 Hz as shown in FIG. 3 (lower limit frequency is 353.5 Hz and upper limit frequency is 707.1 Hz) ) and a measurement frequency band with a center frequency of 2000 Hz (lower limit frequency is 1414.2 Hz and upper limit frequency is 2828.4 Hz). On the other hand, when a set of test sounds with center frequencies of 1000 Hz and 4000 Hz is output in S90, the measurement frequency band with a center frequency of 1000 Hz as shown in FIG. 3 (lower limit frequency is 707.1 Hz and upper limit frequency is 1414.2 Hz) ) and a measurement frequency band with a center frequency of 4000 Hz (lower limit frequency is 2828.4 Hz and upper limit frequency is 5656.8 Hz). Then, the single sound pressure exposure level for each measurement frequency band with center frequencies of 500 Hz and 2000 Hz, or 1000 Hz and 4000 Hz is calculated for each of the sound source chamber 52 and the sound receiving chamber 54.

S130 (sound insulation performance evaluation): The impulse response measurement unit 42 calculates the difference between the single sound pressure exposure level in the sound source chamber 52 and the single sound pressure exposure level in the sound receiving room 54 calculated in S120 above, at a center frequency of 500 Hz. and 2000 Hz, or each of the measurement frequency bands whose center frequencies are 1000 Hz and 4000 Hz. Then, based on those differences, the sound insulation performance of the building 50 to be measured in the measurement frequency bands with center frequencies of 500 Hz and 2000 Hz, or the sound insulation performance of the measurement frequency bands with center frequencies of 1000 Hz and 4000 Hz is evaluated. .

S140 (Measurement group determination): For all the center frequency groups selected in S70 above by the worker or the like (in this embodiment, the group with center frequencies of 500 Hz and 2000 Hz, and the group with center frequencies of 1000 Hz and 4000 Hz), Determine whether sound insulation performance measurement has been performed. As a result, if all the sets have been measured (YES), the process moves to S150, and if there are still sets that have not been measured (NO), the process returns to S90. That is, the above steps S90 to S130 are repeatedly performed until all sets of measurements are performed.
S150 (Measurement method execution determination): A worker or the like determines whether both the pink noise measurement and the impulse response measurement assigned to each of the measurement frequency bands in S10 have been performed. As a result, if both measurement methods have been executed (YES), the sound insulation performance measurement method according to the embodiment of the present invention has been completed, and if either measurement method has not been executed yet (NO), the sound insulation performance measurement method according to the embodiment of the present invention has been completed. , returns to S20 and executes the measurement method that has not been executed.

Here, S10, S20, S70, S80, S140, and S150 shown in FIG. 2 do not need to be performed every time a measurement is performed using the sound insulation performance measuring method according to the embodiment of the present invention. For example, if you want to perform a measurement on a measurement frequency band that has already been performed in another building 50 or in another room within the same building 50, you can simply reuse the selections and settings from the previous measurement. Good too. That is, the measurement method assignment result in S10, the center frequency set selection result in S70, and the output frequency band setting result in S80 may be input into the control device 40 in advance and used. Further, S20 and S150 may be omitted by incorporating software into the control device 40 that sequentially executes the pink noise measurement and the impulse response measurement according to a predetermined execution order. At this time, S140 may be omitted by using software that continuously executes impulse response measurements for all the sets selected in S70 according to a predetermined execution order.

Further, the sound insulation performance measuring method according to the embodiment of the present invention may be one in which measurement is performed only by impulse response measurement without performing pink noise measurement. For example, if the measurement frequency band as shown in FIG. For the remaining measurement frequency bands whose center frequencies are 125 Hz and 250 Hz, a single impulse test sound may be output for each measurement. Also, select a set with center frequencies of 125 Hz and 500 Hz, a set of 250 Hz and 1000 Hz, a set of 500 Hz and 2000 Hz, and a set of 1000 Hz and 4000 Hz, and output and measure the synthesized impulse test sound of each set. You may do so. Furthermore, measurement frequency bands with center frequencies such as 63Hz and 8000Hz, which are not shown in Fig. 3, are used auxiliary, and output frequency bands with center frequencies such as 63Hz and 8000Hz are set, and these are combined. The measurement may be performed by outputting a synthetic impulse test sound. In either case, two output frequency bands set to two center frequencies of the same set are such that the lower limit frequency and upper limit frequency of one output frequency band are equal to the lower limit frequency and upper limit frequency of the other output frequency band. It is preferable that the size is three times as large as .

Now, according to the embodiment of the present invention having the above configuration, it is possible to obtain the following effects. That is, the sound insulation performance measurement method according to the embodiment of the present invention uses, for example, a sound insulation performance measurement system 10 as shown in FIG. This is a method of measuring and understanding each of a plurality of measurement frequency bands. Specifically, it includes an impulse response measurement that outputs a synthetic impulse test sound as shown in S70 to S130 in FIG. That is, in the impulse response measurement of this sound insulation performance measurement method, at least one set of center frequencies to be used as a synthesis target for the test sound is selected from a plurality of center frequencies that define a plurality of measurement frequency bands to be measured (see S70). . Then, for each of the two center frequencies included in each selected set, an output frequency band for outputting as a test sound is set separately from the corresponding measurement frequency band (see S80).

In other words, in addition to the measurement frequency band for measurement, an output frequency band for output is set for each of the center frequencies selected for synthesis of the test sound, and at this time, the measurement frequency band that includes the measurement frequency band is set. The output frequency band is set to a wider band than the above (see, for example, FIGS. 3 and 4). Then, the signals of two output frequency bands corresponding to the two center frequencies included in each selected set are synthesized and output as the above-mentioned synthesized impulse test sound in the sound source room 52 in the building 50 (see S90). , the sound is collected and measured in both the sound source room 52 and the sound receiving room 54 in the building 50 (see S100 and S110). During this measurement, analysis is performed for each measurement frequency band corresponding to the two center frequencies of each set of synthesized test sounds to calculate the single sound pressure exposure level (see S120). The sound insulation performance for each measurement frequency band is determined by using the difference between the analysis results of the sound receiving room 54 and the sound receiving room 54 (see S130).

As a result, instead of outputting a test sound for each measurement frequency band of the measurement target and performing measurements, it is possible to perform measurements by outputting a synthesized test sound for each selected set. The measurement time can be shortened compared to other methods. Moreover, due to the band adjustment when setting the output frequency band wider than the measurement frequency band, it does not affect the analysis performed for each measurement frequency band, but it causes problems when combining the signals of the two output frequency bands. This can be avoided. Therefore, it is possible to efficiently measure the sound insulation performance of the entire frequency band of the measurement target while suppressing the measurement time.

Further, the sound insulation performance measuring method according to the embodiment of the present invention performs impulse response measurement using the swept-sine method, whereby two outputs corresponding to the two center frequencies of each selected set are Each signal before frequency band synthesis has a waveform like a sine wave that shifts from the lower limit frequency to the upper limit frequency and continues until the end of the signal. If such two signals are combined as they are, for example, as shown in the waveform shown in Fig. 6, the amplitude of the parts where the peaks of the signals overlap and the parts where the valleys overlap will become large, resulting in an increase in the output. There is a risk that the sound may be distorted or the output device 12 used for output may be destroyed. Furthermore, if the output volume of the synthesized test sound is reduced in order to avoid this, the components of the test sound radiated into the space will be reduced, making it more susceptible to background noise and making it impossible to evaluate sound insulation performance. There is also a possibility.

Therefore, in the sound insulation performance measuring method according to the embodiment of the present invention, the two output frequency bands corresponding to the two center frequencies of each set to be synthesized are set such that the center frequencies in FIG. 4 correspond to 500 Hz and 2000 Hz, for example. For example, two output frequency bands or two output frequency bands whose center frequencies correspond to 1000 Hz and 4000 Hz, the lower limit frequency and upper limit frequency of one output frequency band are the same as the lower limit frequency and upper limit frequency of the other output frequency band. Set it to be 3 times the size. As a result, even if the signals of the two output frequency bands are combined, it is possible to avoid the peaks and valleys of the signals from directly overlapping, as shown in Figure 5. The amplitude of the signal can be suppressed. Therefore, even if the output volume of the synthetic impulse test sound synthesized in this manner is increased, many test sound components can be radiated into the space without causing sound distortion or damage to the output device 12. , it becomes possible to measure sound insulation performance without any problems.

Further, the sound insulation performance measuring method according to the embodiment of the present invention includes pink noise measurement as shown in S30 to S60 in FIG. 2 in addition to impulse response measurement. A pink noise test sound covering the entire measurement frequency band is output from the sound source chamber 52 (see S30), and this output is collected in both the sound source room 52 and the sound receiving room 54 (see S40). Furthermore, the sound pressure level is calculated by analyzing the sound collection results for each measurement frequency band of the pink noise measurement target (see S50), and analysis of the sound source chamber 52 and sound receiving chamber 54 in each measurement frequency band is performed. The difference between the results is used to understand the sound insulation performance for each measurement frequency band (see S60). The sound insulation performance measuring method according to the embodiment of the present invention divides the plurality of measurement frequency bands of the measurement target into a low frequency band that is not easily affected by background noise and a high frequency band that is easily affected by background noise. It is divided into two parts, and one part is measured by pink noise measurement and the other part is measured by impulse response measurement (see S10 in FIG. 2).

That is, the measurement frequency band belonging to the low frequency band is measured by pink noise measurement, and the measurement frequency band belonging to the high frequency band is measured by impulse response measurement. As a result, pink noise measurement is not suitable for high frequency bands that are easily affected by background noise, but can be used to measure low frequency bands that are not easily affected by background noise. can be measured all at once. Furthermore, measurement of the remaining measurement frequency bands belonging to the high frequency band susceptible to background noise can be performed by impulse response measurement in which a synthesized impulse test sound is output for each selected set. Therefore, the measurement of the sound insulation performance in the measurement frequency band of the measurement target can be performed more efficiently by further shortening the overall measurement time.

Furthermore, the sound insulation performance measuring method according to the embodiment of the present invention uses measurement frequency bands whose center frequencies are 125 Hz, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz for each octave band, as shown in FIG. are included as a plurality of measurement frequency bands to be measured. Then, the measurement frequency bands with center frequencies of 125 Hz and 250 Hz are divided into low frequency bands to be measured by pink noise measurement, and the measurement frequency bands with center frequencies of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz are divided into low frequency bands to be measured by pink noise measurement. It is separated into high frequency bands which are measured by impulse response measurements. Accordingly, the pickup results of pink noise test sounds across multiple measurement frequency bands were analyzed in the measurement frequency band with a center frequency of 125Hz and the measurement frequency band with a center frequency of 250Hz, and the sound of 125Hz and 250Hz was analyzed. The pressure level is calculated and pink noise measurement in the low frequency band is performed (see S30 to S60 in FIG. 2).

On the other hand, in impulse response measurement, a set of center frequencies of 500 Hz and 2000 Hz is selected as a set of two center frequencies for signal synthesis, and a set of center frequencies of 1000 Hz and 4000 Hz is selected as a set of two center frequencies for signal synthesis. (see S70 in FIG. 2). Further, for each of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz, an output frequency band wider than the corresponding measurement frequency band is set (see S80 in FIG. 2). Then, a synthesized impulse test sound is produced by combining a signal in an output frequency band with a center frequency of 500 Hz and a signal in an output frequency band with a center frequency of 2000 Hz (see S90 in Figure 2), and the response of this output is centered. Analysis is performed using a measurement frequency band with a frequency of 500 Hz and a measurement frequency band with a center frequency of 2000 Hz (see S100 and S110 in FIG. 2).

Similarly, output a synthetic impulse test sound that combines a signal in an output frequency band with a center frequency of 1000 Hz and a signal in an output frequency band with a center frequency of 4000 Hz, and calculate the response of this output as a measurement frequency with a center frequency of 1000 Hz. and a measurement frequency band with a center frequency of 4000 Hz. In this way, the single sound pressure exposure level of each of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz is calculated, and the impulse response measurement in the high frequency band is performed (see S120 and S130 in FIG. 2). This allows the measurement of the measurement frequency band whose center frequency is one octave band at a time to be efficiently divided into a low frequency band that takes advantage of the characteristics of pink noise measurement and a high frequency band that takes advantage of the characteristics of impulse response measurement. It can be executed in a short time.

Moreover, as shown in FIG. 4, the sound insulation performance measuring method according to the embodiment of the present invention sets the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 500 Hz to 353 Hz and 943 Hz, and also sets the center frequency to 353 Hz and 943 Hz. The lower limit frequency and upper limit frequency of the 2000 Hz output frequency band are set to 1059 Hz and 2829 Hz. As a result, the output frequency band with a center frequency of 2000 Hz can be set to be three times as large as the output frequency band with a center frequency of 500 Hz to be synthesized. Further, the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 1000 Hz are set to 707 Hz and 1886 Hz, and the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 4000 Hz are set to 2121 Hz and 5658 Hz. As a result, the output frequency band with a center frequency of 4000 Hz can be set to be three times as large as the output frequency band with a center frequency of 1000 Hz to be synthesized. By doing this, even when performing impulse response measurements using the swept-sine method, etc., the amplitude of the synthesized signal can be suppressed, so the sound insulation performance in high frequency bands can be maintained without any problems. It becomes possible to measure.

In addition, the sound insulation performance measurement method according to the embodiment of the present invention includes a plurality of sets of center frequencies for synthesizing signals so as to cover all of the plurality of center frequencies that define the plurality of measurement frequency bands of the measurement target. By selecting a set, the sound insulation performance of the measurement target in all measurement frequency bands may be measured only by impulse response measurement. As a result, even though only impulse response measurement is used as a measurement method, each set of measurements uses a synthetic impulse test sound that combines signals of two output frequency bands, so as a result, the entire measurement frequency band of the measurement target is used. This makes it possible to reduce the measurement time required.

Note that the measurement frequency band to which the sound insulation performance measurement method according to the embodiment of the present invention is applied is not limited to the measurement frequency band as shown in FIG. may be applied to measurement frequency bands with a center frequency smaller or larger than . Furthermore, the center frequency is not limited to being set for each octave band, but may be set for each 1/3 octave band. Furthermore, the building 50 to which the sound insulation performance measuring method according to the embodiment of the present invention is applied is not limited to the floor plan shown in FIG. The position of the chamber 54 is also arbitrary.

On the other hand, the sound insulation performance measurement system 10 according to the embodiment of the present invention measures the air sound insulation performance of the building 50 to which the high sound insulation performance specifications are applied, using the sound insulation performance measurement method as described above. As shown in FIG. 1, it includes an output device 12, a plurality of sound collection devices 20, and a control device 40. The output device 12 is for outputting test sounds used in each measurement method, and is installed in the sound source room 52 of the building 50 to be measured. The sound collection device 20 is for collecting the test sound output from the output device 12, and is installed in both the sound source room 52 and the sound reception room 54 of the building 50 to be measured. The control device 40 is connected to the output device 12 and the sound collection device 20, and includes an impulse response measurement section 42 and a pink noise measurement section 44. The impulse response measurement unit 42 is a part that performs impulse response measurement, and outputs a synthesized impulse test sound in which signals of two output frequency bands are synthesized from the output device 12, and the sound is collected via the sound pickup device 20. The response results are analyzed for each of the two measurement frequency bands corresponding to the combined signal.

Further, the pink noise measurement section 44 is a section that performs pink noise measurement, and outputs pink noise test sounds covering a plurality of measurement frequency bands from the output device 12 and collects the collected sounds via the sound collection device 20. The results are analyzed for each measurement frequency band of the pink noise measurement target. Because of this configuration, the control device 40 can perform measurement of the measurement frequency band belonging to the low frequency band using the pink noise measurement section 44, and measurement of the measurement frequency band belonging to the high frequency band may be performed using the impulse response measurement section 42. You can switch the parts to be executed. Thereby, the sound insulation performance of a plurality of measurement frequency bands can be efficiently measured in a short time according to an arbitrarily set execution order, for example, while achieving the same effect as the sound insulation performance measurement method described above.

10: Sound insulation performance measurement system, 12: Output device, 20 (20A to 20D): Sound collection device, 40: Control device, 42: Impulse response measurement section, 44: Pink noise measurement section, 50: Building, 52: Sound source Room, 54: Sound receiving room

Claims (7)

The above-mentioned test was conducted to evaluate the air sound insulation performance of a building to which high sound insulation performance specifications are applied, in which the test sound output from a sound source room inside the building was collected in both the sound source room and a sound receiving room inside the building. A method of measuring and understanding each of multiple measurement frequency bands using sound differences,
Selecting at least one set of center frequencies from a plurality of center frequencies defining the plurality of measurement frequency bands, and for each of the two center frequencies included in each selected set, for output wider than the corresponding measurement frequency band. After setting the output frequency band of the output frequency band, output a synthetic impulse test sound that is a combination of signals of the two output frequency bands corresponding to the two center frequencies, and make the response of the output correspond to the two center frequencies. A sound insulation performance measurement method characterized by including impulse response measurement that is analyzed for each measurement frequency band. The impulse response measurement uses a Swept-sine method,
The two output frequency bands corresponding to the two center frequencies are arranged such that the lower limit frequency and upper limit frequency of one output frequency band are three times as large as the lower limit frequency and upper limit frequency of the other output frequency band. 2. The sound insulation performance measuring method according to claim 1, wherein: including pink noise measurement in which a pink noise test sound covering all of the plurality of measurement frequency bands is output, and the sound collection result of the output is analyzed for each measurement frequency band of the measurement target,
The plurality of measurement frequency bands are divided into two, a low frequency band and a high frequency band, and the measurement frequency band belonging to the low frequency band is measured by the pink noise measurement, and the measurement frequency band belonging to the high frequency band is measured. 3. The sound insulation performance measuring method according to claim 1, wherein the measurement is performed by the impulse response measurement. The plurality of measurement frequency bands include measurement frequency bands each having a center frequency of 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, and 4000Hz,
By the pink noise measurement, a measurement frequency band with a center frequency of 125 Hz and a measurement frequency band with a center frequency of 250 Hz are measured,
Through the impulse response measurement, two sets are selected: a set in which the two center frequencies are 500 Hz and 2000 Hz, and a set in which the two center frequencies are 1000 Hz and 4000 Hz, and measurement is performed for each of the selected sets. 4. The method for measuring sound insulation performance according to claim 3. The lower limit frequency and upper limit frequency of the output frequency band having a center frequency of 500 Hz are set to 353 Hz and 943 Hz, and the lower limit frequency and upper limit frequency of the output frequency band having a center frequency of 2000 Hz are set to 1059 Hz and 2829 Hz,
The lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 1000 Hz are set to 707 Hz and 1886 Hz, and the lower limit frequency and upper limit frequency of the output frequency band whose center frequency is 4000 Hz are set to 2121 Hz and 5658 Hz. The sound insulation performance measuring method according to claim 4. The sound insulation according to claim 1 or 2, wherein a plurality of sets of center frequencies are selected by the impulse response measurement so as to cover all of the plurality of center frequencies, and measurement is performed for each selected set. Performance measurement method. A system for measuring the air sound insulation performance of a building to which a high sound insulation performance specification is applied, using the sound insulation performance measurement method according to any one of claims 3 to 5,
an output device installed in the sound source room for outputting a test sound;
a sound collecting device installed in both the sound source room and the sound receiving room for collecting test sounds;
a control device connected to the output device and the sound collection device,
The control device includes an impulse response measurement unit that outputs the synthesized impulse test sound from the output device and performs the impulse response measurement using the result of sound collection from the sound pickup device; A sound insulation performance measurement system comprising: a pink noise measurement unit that outputs a test sound and performs the pink noise measurement using the result of the sound collected from the sound collection device.

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