When planning a music hall or a theater, firstly, it is important to make a supposed program, concept, clearer. At the same time, we need to place priorities on ensuring silence and proper reverberations for the programs. Our process of acoustic consulting begins from working with the customer, design office and contractor according the clients perspective.
After establishing the serenity (noise criterion curves) for the purpose of the hall, we will implement an actual measurement regarding the source of the noise/vibration from the inside or outside of the building, gather document the data and investigate the required sound insulation and vibration-proofing structure. However, there are cases when a high-grade sound insulation/vibration-proofing structure is not necessary to prevent noise or vibration from the surrounding areas when the building is isolated in the suburbs, in the urban area we need to consider the effects from railroads and streets and in case of a compound building where there are large, middle and small halls, rehearsal room, or other institution except halls the highest-grade sound insulation/vibration-proofing structure is usually required.
Our company will research the proper sound insulation/vibration-proofing structure using the experience as well as the technical ability that the acoustic design and construction division has accumulated through many actual construction results.
Next, planning a sound field of the room, we establish a target value for the reverberation time according to the purpose of the hall and select the interior decoration materials, layout of sound absorption to reflection and investigation the shape of the diffusion. During the process, a reflected sound simulation, (sound diagram and figure)
for calculating the reverberation time or investigating the shape of the room, and auralization by 'RIMAGE' are investigated by implementing a model experiment.
Moreover, the following investigation may be implemented in some cases in addition to the usual acoustic investigation.
▪ Measuring the sound absorption characteristics of the complex material difficult to estimate, in our reverberation chamber in the acoustic laboratory.
▪ Inspecting the reflection characteristics of rib structure with a fear of coloration, in our anechoic chamber.
▪ Estimating the sound absorbing characteristics of acoustic materials without sound absorption coefficient data, by using software 'STRATI-ARTZ' that we developed.
▪ Visualizing the incoming wave of reflected sound by using an omni-directional sound source analysis system 'Noise Vision' that was developed to comprehend the existing sound field and analyze the areas that need improvements on planning to remodel a hall.
When moving from the design to the constructing stage, we check the drawings of construction and facilities, air conditioning muffling statement, vibration isolation statement of construction and facilities and construction guide and also carry out a construction check on the spot according to the progress of the work.
During the construction process, we conduct a intermediate time acoustic measurement and check if the first acoustic spec at the designing stage has been secured and in case improvement is required, we analyze a way to correct and carry out the measurement again after executing a countermeasure.
Upon completion, we implement 'completion acoustical measurement' and confirm the final acoustic performance.
We provide a comprehensive acoustical design technology, from the prior measurement, to the acoustic analysis from the basic designing/implemental designing stage, acoustical construction management and acoustic measurements along with our acoustical consulting.
Since a gym is used for sports and exercises, hard finishing material is used so a ball or people can't crack the finish, and also making the reverberation time longer. If the reverberation time is too long it will disrupt hearing an announcement, or it can cause difficulties to talk by a cheer. In case of a lecture or a concert, a sound disturbance such as long reverberation or long-path echo makes it more difficult to listen to a lecture or music causing stress to both the performer and the audience.
Our company uses 'Impulse Response Measurement System' to measure/check the existing reverberation time, echo and articulation and grasps the situation and the cause obstacle of sound that we analyze the countermeasure against it. Moreover, our unique software, room acoustic design support software called 'RIMAGE' enables us to aural the effect of the countermeasure.
If these facilities are not independent and built inside a compound building, the problems such as cheers or sound of performance will transmit to the surrounding rooms and the floor impact sound like a dribbling of ball or sound of running will echo to the floor below.
Depending on the location, those sounds may spread to neighbors and can cause problems. Our company will examine the volume of present generated sound in a room and of propagation sound on the site boundary, analyze the sound insulation and the noise around the neighborhood then using a noise prediction software called 'GEONOISE' to investigate the source of the noise.
In a conference room or a class room, a sound problem like "not being able to listen to a conversation because of echo", "unclear", or "hearing voices from the hallway or the next room", "leaking sound of voices to the hallway or the next room" can occur.
The design takes priority, not using a sound absorbing material in the ceiling or in the wall is usually the cause of the too much echoes in the room, so in many cases the problems can be solved by placing the proper sound absorption material to the proper place on the ceiling or in the wall during the planning stage. Generally the sound absorption measures are implemented in the wall, however since the practical area for construction is limited considering the furniture such as windows or shelves, selecting an effective sound absorption material will be important. When designing a room using a room acoustic simulation will enable you to aural the difference of the specs.
Furthermore, a common problem in a conference room in an office building is sound leaking from room to room.
In this case, the back of the ceiling has a return chamber for the air conditioning, the voices that entered from the vent of the ceiling will spread through the back of the ceiling can be heard in the next room, or the sound insulation may break at the part of a curtain wall or perimeter and the wall balances creating a sound insulation loss. Our company can pinpoint the area where the sound is leaking in from and what extent the leaking is by using an omni-directional sound source analyzing system called 'Noise Vision' to integrate a countermeasure for the client.
When constructing a practice room for instruments in an apartment house, because of the room size restrictions, the structure of the building and the maximum floor weight, it is difficult to construct and implement a sound and vibration proof environment.
Especially, there is a limit in securing enough sound proofing/vibration isolation performance for percussion instruments like drum that produce high volume or vibration, so realistically we need to consider self control such as avoiding playing during bedtime.
Even in the case of detached house, soundproofing performance specification will change depending on the conditions, such as if there is enough distance between you and your neighbors, and if it is a wooden structure or RC built.
Estimating the volume of the sound on the assumption of what kind of music you practice with what instrument, and estimation the required sound insulation investigating the surrounding environments of the building site, the acoustical design in which we judge what kind of sound proofing/vibration isolation performance is important.
Our company provides comprehensive services, not only in acoustic consulting, but also in architectural acoustics design/ construction/ sound tuning.