We sometimes are asked the question like this. In general, in case that the floor of a room in a condominium or a single family home is made of wood, it means all 6 faces, the ceiling, wall and floor, have been finished with a reflective acoustical interior material. Thus the sound produced in the room is not easily absorbed making an echo in the room (reverberation sound) tend to be long, but a high ceiling or the dimension of the room is big, the reverberation sound will stay longer and the room may be not be easy to use or the space makes you feel uncomfortable.
In this case, the result from the measurement of the reverberation time in the room will enables us to estimate the sound absorbing performance we need to add to the room and then suggest a concrete idea of a sound absorbing performance to you.
Reverberation time means the time that a sound attenuated until 60dB after it was stopped in a room.
To measure it, we produce a sound for the test in the room and install it into a computer using a microphone, and analyze the reverberation sound at each frequency, from low to high tones.
From this measurement result, we are able to calculate and estimate the amount of acoustic material that the room will need. Also at the same time we can analyze the reverberation time and we are able to analyze the strength or the arrival time of a reflected sound. The result from this makes it possible to estimate the part of the wall or the ceiling where acoustic material is needed.
The cost for this measurement depends on the place and the number of the places to measure, and the time when the measuring is allowed. As an example, the cost for measuring some rooms in Tokyo 23 wards will be about ¥200,000 or higher including a report. Please contact our acoustic solution division (81-3-3634-5300) for more details.
Vibration in a room can be a problem. For example, the vibration produced during the operation of a multi-story parking garage of an apartment house is sometimes transmitted to a room. In this case, not only the direct vibration, but also the structure bone sound which is re-radiated as noise from the wall or the floor of the room after the vibration was transmitted through the concrete frame work of an apartment house, can usually be a problem.
Also, there is a case that you can feel a vibration when lying on your bed but cannot figure out the cause of it. Taking a countermeasure against this vibration is not easy, but to confirm the situation of the vibration, we furnish a vibration acceleration pick up to the floor or the wall and bring the data recorded in the data recorder back to our company and analyze the data. Besides, we sometimes measure the vibration in many places at the same time and investigate the part where the vibration was produced from or the transmission path of it.
The cost for this measurement changes greatly depending on the place and the number of the places to measure, so please contact our acoustic solution division (81-3-3634-5300) for more details.