Guangzhou DSPPA Audio Co., Ltd.

Quais são os requisitos para a configuração de alto-falante em sistemas de alto-falante de ação pública?

Usually, the background noise of office corridor is about 48-52 dB, and that of supermarket is about 58-63 dB, and that of busy section is about 70-75 dB. Considering that the scene may be very confused in the event of an accident, the background noise should not be estimated too low for the need of emergency broadcasting, even if the broadcasting service area is an office building. Therefore, as a general consideration, in addition to busy and lively places, background noise may be roughly regarded as 65-70dB (except in special cases). According to this calculation, the sound pressure level in the broadcast coverage area should be above 80-85 dB.

Desde queAlto-falantes de endereço público are usually distributed, the sound pressure level in the adress coverage area can be approximately considered as the contribution of a single public adress speakers... De acordo com a teoria da eletroacústica relevante, o nível de pressão sonora SPL na área de cobertura do alto-falante tem as seguintes relações com o nível de sensibilidade LM do alto-falante, a potência P alimentada ao alto-falante, o ponto de escuta e a distância r do alto-falante, etc.
SPL=LM 10lgP-20lgrdB(1)

O nível de sensibilidade do alto-falante da varíola varia de 88 a 93 dB e a potência nominal é de 3 a 10 W. Calculado por 90dB/8W, o nível de pressão sonora a 8m de distância do alto-falante é de cerca de 81dB. A contribuição do grupo de som refletido no início não é considerada no cálculo acima. No interior, a contribuição do grupo de som refletido inicial e dos alto-falantes adjacentes pode aumentar o nível de pressão sonora em cerca de 2-3 dB.

According to the above approximate calculation, the ceiling loudspeakers can be arranged evenly at a distance of 5-8 m in a venue whose ceiling is not higher than 3 m. If only background music is considered and emergency broadcasting is not considered, the distance can be increased to 8-12 M. In addition, the design and installation code for fire accident broadcasting in mainland China (hereinafter referred to as "code").

Basicamente, não há grupos de som reflexivos iniciais em áreas externas e a cobertura efetiva de um únicoAlto-falante do endereço público can only be taken as the lower limit calculated above. Since the lower limit corresponds to a very short distance, in principle, a sound column composed of multiple speakers should be used. The sound pressure level can be increased by 3dB for every doubling of the signal power to the speaker group (such as the sound column) provided that the group is acceptable. From 1 to 2 is double; from 2 to 4 is double. In addition, the sound pressure level will decrease by 6 dB for every doubling of distance. According to the above rules, it is not difficult to calculate the configuration distance of outdoor sound column.

Notícias relacionadas
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  • Email:Export@dsppa.com
  • Endereço:Cidade de Jianggao, distrito de Baiyun, Guangzhou, China
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