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1, meeting room acoustical
requirements:
A good listen to the establishment of sound environment, including two
aspects of architectural acoustics and acoustic content; professional
sound engineering refers to the main hall of the building is built of
acoustic sound, the level of the same equipment play different reasons,
are generally built sound different conditions. No matter how good
equipment, once in the construction of sound harsh environmental
conditions, will not achieve good results; and the acoustical
requirements but also because of the engineering requirements are
different, the impact will be affected by the quality of architectural
decoration. Acoustical conditions good hall should be reasonable and
good sound reverberation, diffusion, no noise, no vibration, acoustic
focusing can be heard without acoustic shadow, no acoustic standing wave
and so on; acoustical requirements cannot be performed by sound
designers unilaterally, it needs strong support of building decoration
technology personnel, choose a good sound the quality of materials, to
achieve the best effect.
2, how to reduce the noise absorbing materials, optimization of sound.
Sound absorption is a phenomenon that the sound wave is gradually fading
in the process of propagation in the medium. The sound absorption
coefficient refers to the percentage of energy incident to the material
surface can be absorbed. When it is greater than 20%, called the sound
absorption material, when it is more than 80%, is called the strong
sound absorption material.
Noise can get up to 10-15dB noise reduction. The noise reduction of
=10lg (A0/A1), did not join the sound absorbing materials on the indoor
sound absorption is less, adding sound-absorbing material after the
indoor sound absorption of more noise better. In the open space of
workshop, large, due to reverberation sound, the noise ratio of the same
the sound source in the outdoor high 10-15dB., the interior decoration
sound-absorbing material, can make the reverberation sound is absorbed,
reduce indoor noise.
Sound absorption material plays a very important role in reducing indoor
noise and improving indoor sound quality, and more and more people pay
attention to it. Many kinds of sound-absorbing materials, different
materials, different appearance, different absorption coefficient is
different, use can be calculated according to the determined number of
sound-absorbing material, the choice of specific materials required both
absorption and aesthetic requirements. General dry wall absorption is
sound-absorbing material and laying cavity between the keel keel formed
on the sound absorption structure system, such as: the sound source
wooden sound-absorbing panels, polyester fiber sound-absorbing board,
wood sound absorption board, is a better choice of decoration and
acoustic design
Due to the short reverberation of the conference hall, it is necessary
to use strong sound absorption structure. Because of strong absorption
process, so the architects often adopt various easy to cause acoustic
defects in shape, such as round, oval, oval, flat vaulted roof. And the
measures to control the defect of sound quality, in addition to the
configuration of the diffusion structure, usually use the strong sound
absorption method, because it also plays the role of controlling the
reverberation time.
3, suitable for meeting room with low frequency sound absorption
structure
1 sound-absorbing board resonance sound absorption structure: in a
variety of thin (wear perforation seam) and a certain depth is arranged
in the closed cavity plate, is composed of a perforated (wear seam)
plate resonance sound absorption structure. When the plate after the
lining of porous material, can broaden the piercing sound absorption
band plate joint. The perforation board will not have a resonance sound
absorption effect when the perforation rate of the perforation plate is
more than 20%.
2 sound source licensing sound-absorbing panels, housing structure
acoustics design, this kind of structure can be designed in the range of
resonance frequency to control, will achieve significant effect. The
surface form can be perforated plate, and also can be made into
resonance sound absorption masonry.
3 soft absorption structure, which is in line with the cavity control of
low frequency required settings in porous material behind the large
thickness.
In the control room and the high frequency reverberation time, in
addition to relying on the audience and the seat of the host itself
should be based on sound absorption, reverberation calculation, indeed
in the wall with strong sound-absorbing material, the parallel side
walls and concave curved surfaces, and can eliminate the defect echoes
and sound focusing. As a wall control, high frequency sound absorbing
material, usually with glass wool, mineral wool board, peripheral flame
retardant fabric or tapestry, also can be equipped with drilling
sound-absorbing structure (aluminum or fiber board drilling) or fabric
flame retardant foam package structure.
After the wall conference room podium, should also be appropriate to
avoid the absorption process, reflected sound, caused by the podium
microphone acoustic feedback; in films, due to phase wall reflection of
sound and loudspeaker system direct sound, causing adverse acoustic
interference.
At the top of the meeting room, when the indoor sound absorption is to
control the reverberation time to achieve the design value, usually do
not make sound absorption processing. And as a reflection surface. The
configuration and selection of the conference room according to the
volume of sound absorption structure of its standard (i.e. decoration
requirements) and in 100m? Especially small meeting about indoor
(Roundtable in general), if the indoor furnishings carpet, curtains and
sofa seat, usually need not other absorption process, which can achieve
the expected reverberation time value. In the conference hall above
200m, the sound absorbing material or structure should be generally
configured.
Sound absorption materials (or structure) of a lot of categories, there
are a variety of forms. But in the form of decoration can be summarized
as the following three categories:
1 exposure type: the sound absorption material is directly arranged on
the surface of the meeting room. As in the keel wall or ceiling is
sound-absorbing cloth board or polyester fiber sound-absorbing board and
drilling acoustic structure.
2 decorative types: various decorative materials and meet the
requirements of the decoration structure on the surface of the
sound-absorbing material, such as in the wall with ecological wooden
sound-absorbing panels
3 concealed type: after the sound of the sound barrier, the
configuration of all kinds of noise felt or all kinds of noise
insulation materials or structures.
The above forms can be determined according to the requirements of sound
absorption and decoration.
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