Sound field design
The basic design of a sound field should include sound insulation processing, of spot noise reduce, build reasonable demand of the structure, the implementation of acoustical uniformity, sound the settlement of the problem such as vibratile, focusing, resonance, feedback, the correct computation of indoor reverberation
Establish acoustical principle
Reverberation is reasonable, sound is diffusible good, focusing, oscillatory without what can hear without sound noise, nod without dead sound
Indoor decorate a note
Tonal when cannot causing the conference or performance too dim
Avoid enlarge sound appear inside area hollow bigger or support poorer housing construction
Avoid large area glazing, do not install stone draft ceiling directly in aluminium alloy chamfer
The main demand of room acoustics character
Have appropriate volume: Loudness
Auditorium (give priority to with the language) be more than 85dB
Song hall (odeum) be more than 103dB
Enlighten hall is more than 110dB
Assembly room is more than 80dB
Sound energy distributings even:
The sound loudness that hears on each seats of pavilion should be compared even. Adopt acoustic quality design, should can make pavilion the difference of sound pressure level of each area is not quite big, indoor sound field is inhomogenous degree should control 3dB is made an appointment with in on any account in
Contented letter a confusion of voices compares a requirement:
Noise produces interference and cover effect to the normal hearing of people. Of different utility indoor listen to phonic environment, the sound level of a confusion of voices of its admissibility is endless and same, normally indoors of the smallest sound pressure level locally, believe comparing of a confusion of voices to should be more than 30dB
Assure indoor everywhere frequency answers balanced:
Indoor sound system should assure everywhere frequency is answered balanced, requirement 125- - rise and fall inside 4000HZ for 6- - 10dB, 100- - rise and fall inside 8000HZ for 10- - 15dB. If room memory is in the acoustics blemish such as resonance of dot of acoustical focusing, dead sound, standing wave, sound, can destroy frequency balanced
Of hall hall build reasonable scale to choose right natural reverberation time
L (long) W (wide) H (tall) auditorium (give priority to with the language) 1.2-1.5S
1.8-2.4S of odeum of 3.10 1.30 1.00
In 3.90 2.70 1.00 little song hall 0.7-1.2S
Assembly room 0.5-0.8S
The computation of reverberation time is formulary
A is average---Indoor average sound power absorption coefficient
S---The in-house gross area of sound field
M---Coefficient of sound energy attenuation (0.0015)
T---Sound field reverberation time
V---The content of sound field is accumulated
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