With the progress of society, government agencies, enterprises and institutions, the Gaestgiveriet Hotel have to be equipped with multi-functional hall and conference rooms, to meet the needs of both to perform drama, dance, music, and movies, to hold the meeting.

Multi function hall and conference hall should have good sound effects, in addition to need to be equipped with good audio equipment, must also be an acoustic design, provide a good acoustic environment.

In order to ensure the function rooms and conference hall of the acoustic environment, the national Ministry of construction, the Ministry of culture in 2001 February issued a code of building design ( JGJ57 -- 2000), require the architectural acoustics design should be involved in construction, decoration design of the whole process, and the auditorium acoustic targets -- reverberation time T60 to make following provisions:

The audience hall reverb time

Frequency characteristic

125Hz

250Hz

500Hz

1000Hz

2000Hz 4000Hz

Reverberation time ( S )

1.10 ~ 1.68, 1.10 ~ 1.54

1.10 to 1.40

1.10 to 1.40

0.99 to 1.40

0.88 to 1.40

Note: the audience chamber volume is 2000 ~ 10000M3

The reverberation time T60 formula is: T60 = 0.161V / ( Sln ( 1 alpha ) + 4mV )

Indoor average sound absorption coefficient: alpha = ( alpha Sigma S I I + and N j j ) / S

Type : V -- S -- M3; the room volume, interior surface area, M2;

Alpha -- Indoor average sound absorption coefficient; m -- airborne sound attenuation coefficient ( M1 );

S I -- interior portion of the surface area, M2; a I -- and surface corresponding to the Si sound absorption coefficient;

N J -- or the number of objects, M2; alpha J -- and Ni corresponding to the sound absorption coefficient.

From the above formula can be seen: to make the reverberation time achieved on schedule, because the room volume and the interior surface area to adjust, rely mainly on the selection of low frequency, high frequency absorption coefficients are higher sound absorption material, so that the low-frequency, high frequency reverberation time meets the requirements. (conference room is low frequency ) and the sound absorption coefficient of the material, such as smaller requires the use of many of the materials, or the use of high sound absorption coefficient of the seat, so that the total investment of the project increased. To use sound absorption board, because of its low frequency, high frequency, the sound absorption coefficient is high, do not need too much quantity, or can choose the sound absorption coefficient of the lower seat, with a lower total investment to achieve good acoustic effects.