Design of sound field

A sound basic design should include the sound insulation, noise reduction, structure reasonable, sound uniformity is achieved, acoustic fibrillation, focusing, resonance, feedback and other problems, the correct calculation of indoor reverberation

Acoustical principle

Reverberation is reasonable, sound diffusion and good, no sound focus, no smell, no dead sound vibration and noise

Interior decoration matters needing attention

Hue cannot lead to a meeting or show too dark

Avoid PA area appear larger or supporting poor hollow cavity structure

Avoid large area glass window, not the stone releases ceiling mounted directly on the aluminum alloy tank

Indoor acoustic characteristics of basic requirements

With proper loudness: loudness

The auditorium (in English) is greater than 85dB

Cabaret ( Concert Hall) is greater than 103dB

Disco is greater than 110dB

The meeting room is larger than 80dB

Energy distribution:

In the audience every seat sound loudness should be uniform. Through the acoustical design, should be able to make the audience in various regions of the sound pressure level difference is too big, interior sound field uniformity should be controlled at the level of about 3dB.

To meet the requirement of signal to noise ratio:

Noise on people's normal auditory interference and masking effect. Different uses of indoor sound environment, the allowable noise level is different, usually in the smallest interior sound pressure level position, signal to noise ratio should be greater than 30dB

Ensure the room around the frequency response equalizer:

Indoor sound system should ensure that all required frequency response equalization, 125--4000HZ 6--10dB 100--8000HZ UPS, downs for 10--15dB. If the house sound focus, dead sound point, standing wave, acoustic resonance acoustic defects, can damage the frequency equalizer

Halls built sound reasonable proportion suitable natural reverberation time

L ( long ) W ( W) H ( high ) auditorium (in English) 1.2-1.5S

3.10 1.30 1 concert 1.8-2.4S

3.90 2.70 1 small and medium-sized karaoke 0.7-1.2S

Meeting room 0.5-0.8S

Reverberation time formula

The average a - indoor average sound absorption coefficient

S - sound field of the total internal surface area

M - acoustic attenuation coefficient ( 0.0015)

T - acoustic reverberation time

V - sound volume

S1---Sn - sound field of the internal surface area

Design reference standard

IEC914 conference system???? electronics and audio equipment standards

Audio conference audio and video display system in accordance with the people's Republic of China national industry standards

GYJ25-86" auditorium sound reinforcement system requirements" acoustical characteristics

CBJ232-82" China electric equipment installation engineering code for construction and acceptance of"

SJ2112" auditorium sound reinforcement system equipment interconnection is preferably electrical matching ＆#118alues"

JGB / T16-92" code for electrical design of civil buildings"

CB7401" image quality subjective evaluation regulations"