Occupation standard of culture of People's Republic of China
The acoustics and characteristic index of sound system of enlarge of hall of singing and dancing and measurement technique WH0301 one 93
Acoustical Characteristics And Measurement Methodsfor The Sound Reinforcement System In Ballroom
1. main content and suitable scope
This standard set commercial the acoustics and characteristic index of the enlarge sound system of hall of singing and dancing and measurement technique.
This standard applies to the hall of of all kinds song that installs equipment of sound having spread, ballroom, card to help the parlor of OK hall and similar function.
2. cites standard
GB3241 sound and oscillatory analysis use 1/1 and 1/3 filter of times frequency Cheng
GB3661 tests requirement of condenser microphone technology
Function of plan report, sound reachs GB3785 sound level measurement technique
Term of term of GB3947 sound formal name
Measurement technique of character of sound of enlarge of GB4959 hall hall
Sound system of enlarge of GYJ25 hall hall is acoustics and characteristic index
3. term
Sound Reinforcement System of 3.1 enlarge sound system
Enlarge sound system is comprised by enlarge sound equipment and sound field. Basically include: spring retreats? of fat of act of Qi У to transform acoustical signal the microphone that is telegraphic date, the equipment that enlarge report signal machines to signal, transmission line, it is telegraphic name change the acoustics environment of numerous area of the loudhailer of acoustical signal and Xin.
3.2 empty field Vacant Auditoria
Divide necessary measurement outside technical personnel, there are audience and actor inside hall. When measuring, when the setting inside hall and corresponding full field are used normally identical.
Maximum Sound Pressure Level of 3.3 the biggest sound pressure level
The when empty field stable state the biggest sound pressure level inside hall.
Maximum Available Gain of 3.4 highest and usable gain
Sound system of enlarge of hall of singing and dancing feedbacks in sound self-excitation is critical the gain of condition is subtractive the gain when 6dB.
3.5 feedback Acoustic Feedback
The howl cry that because enlarge sound system is medium,the one part of the energy of loudhailer output feedbacks to be caused to microphone or disintegration sound.
3.6 transmission frequency wait for sexual Transmission Frequency Characteristic
The average that sound pressure level of bit of place stable state measures each inside hall is in sound to press at microphone of enlarge sound system relatively or input of enlarge sound equipment carries a frequency of voltage to answer.
Hound]transmission Gain of the 3.7 gain that transmit sound
When enlarge sound system amounts to highest and usable gain, the difference that the dot measures to be in microphone of average of stable state sound pressure level and enlarge sound system to handle sound pressure level each inside hall is worth.
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