[Audio Network Information] Sound field design The basic design of a sound field should include sound insulation, reduction of on-site noise, reasonable requirements of building structure, realization of sound uniformity, resolution of acoustic vibration, focus, resonance, feedback, etc. Correct calculation
The principle of sound construction is reasonable, the sound is diffuse, there is no sound focus, no audible vibration noise, no dead point.
Indoor decoration precautions The color tone cannot cause the meeting or performance to be too dim. Avoid large hollow or poorly supported cavity structure in the sound reinforcement area. Avoid large-area glass windows. Do not install the stone ceiling directly in the aluminum alloy tank.
Basic requirements for room acoustic characteristics <br> With appropriate loudness: Loudness hall (mainly language) greater than 85dB
The karaoke hall (concert hall) is larger than 103dB
Disco is greater than 110dB
Meeting room is greater than 80dB
Sound energy distribution is even:
The sound level heard in each seat of the auditorium should be relatively uniform. Through the sound quality design, the sound pressure level of each area of ​​the auditorium should not be too different, and the indoor sound field unevenness should be controlled within about 3dB.
Meet the signal to noise ratio requirements:
Noise interferes with and masks people's normal hearing. The indoor listening environment for different purposes has different noise levels, usually at the position of the indoor minimum sound pressure level, the signal-to-noise ratio should be greater than 30dB.
Ensure balanced frequency response throughout the room:
The indoor sound system should ensure that the frequency response is balanced everywhere, requiring an internal undulation of 6--10 dB in the range of 125--4000 HZ and a 10--15 dB undulation in the 100--8000 HZ. If there are acoustic defects such as acoustic focus, dead sound point, standing wave, and acoustic resonance in the room, the frequency balance will be destroyed.
The reasonable proportion of the hall’s sound is selected to choose the appropriate natural reverberation time.
L (long) W (wide) H (high) auditorium (mainly language) 1.2-1.5S
3.10 1.30 1.00 Concert Hall 1.8-2.4S
3.90 2.70 1.00 small and medium karaoke 0.7-1.2S
Meeting room 0.5-0.8S
Calculation formula for reverberation time
a average---the average sound absorption coefficient in the room
S --- total internal area of ​​the sound field
M --- Sound energy attenuation coefficient (0.0015)
T --- sound field reverberation time
V --- the inner volume of the sound field
Internal surface area of ​​S1---Sn--sound field
Relevant standards referenced in the design of the scheme
IEC914—Conference System—Electronic and audio equipment standard audio conference sound reinforcement and video display system in accordance with the national industry standards of the People’s Republic of China
GYJ25-86 "Acoustic Characteristics Requirements for Hall Sound Reinforcement System"
CBJ232-82 "China Electrical Installation Engineering Construction and Acceptance Specifications"
SJ2112 "Optimal electrical matching value of equipment interconnection of hall sound reinforcement system"
JGB/T16-92 "Code for Electrical Design of Civil Buildings"
CB7401 "Image Quality Subjective Evaluation Regulations"
CB7401 "Image Quality Subjective Evaluation Regulations"
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The principle of sound construction is reasonable, the sound is diffuse, there is no sound focus, no audible vibration noise, no dead point.
Indoor decoration precautions The color tone cannot cause the meeting or performance to be too dim. Avoid large hollow or poorly supported cavity structure in the sound reinforcement area. Avoid large-area glass windows. Do not install the stone ceiling directly in the aluminum alloy tank.
Basic requirements for room acoustic characteristics <br> With appropriate loudness: Loudness hall (mainly language) greater than 85dB
The karaoke hall (concert hall) is larger than 103dB
Disco is greater than 110dB
Meeting room is greater than 80dB
Sound energy distribution is even:
The sound level heard in each seat of the auditorium should be relatively uniform. Through the sound quality design, the sound pressure level of each area of ​​the auditorium should not be too different, and the indoor sound field unevenness should be controlled within about 3dB.
Meet the signal to noise ratio requirements:
Noise interferes with and masks people's normal hearing. The indoor listening environment for different purposes has different noise levels, usually at the position of the indoor minimum sound pressure level, the signal-to-noise ratio should be greater than 30dB.
Ensure balanced frequency response throughout the room:
The indoor sound system should ensure that the frequency response is balanced everywhere, requiring an internal undulation of 6--10 dB in the range of 125--4000 HZ and a 10--15 dB undulation in the 100--8000 HZ. If there are acoustic defects such as acoustic focus, dead sound point, standing wave, and acoustic resonance in the room, the frequency balance will be destroyed.
The reasonable proportion of the hall’s sound is selected to choose the appropriate natural reverberation time.
L (long) W (wide) H (high) auditorium (mainly language) 1.2-1.5S
3.10 1.30 1.00 Concert Hall 1.8-2.4S
3.90 2.70 1.00 small and medium karaoke 0.7-1.2S
Meeting room 0.5-0.8S
Calculation formula for reverberation time
a average---the average sound absorption coefficient in the room
S --- total internal area of ​​the sound field
M --- Sound energy attenuation coefficient (0.0015)
T --- sound field reverberation time
V --- the inner volume of the sound field
Internal surface area of ​​S1---Sn--sound field
Relevant standards referenced in the design of the scheme
IEC914—Conference System—Electronic and audio equipment standard audio conference sound reinforcement and video display system in accordance with the national industry standards of the People’s Republic of China
GYJ25-86 "Acoustic Characteristics Requirements for Hall Sound Reinforcement System"
CBJ232-82 "China Electrical Installation Engineering Construction and Acceptance Specifications"
SJ2112 "Optimal electrical matching value of equipment interconnection of hall sound reinforcement system"
JGB/T16-92 "Code for Electrical Design of Civil Buildings"
CB7401 "Image Quality Subjective Evaluation Regulations"
CB7401 "Image Quality Subjective Evaluation Regulations"
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