Guangzhou DSPPA Audio Co., Ltd.

Was sind die Anforderungen für die Lautsprecher konfiguration in öffentlichen Lautsprecher-Lautsprechers ystemen?

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.

SeitÖffentliche Adresse Lautsprecher 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. Nach der einschlägigen Elektro akustik theorie hat der Schalldruck pegel SPL im Lautsprecher abdeckung bereich die folgenden Beziehungen zum Empfindlichkeit pegel LM des Lautsprechers, der dem Lautsprecher zugeführten Leistung P, der Hör punkt und die Entfernung r des Lautsprechers usw.
SPL=LM 10lgP-20lgrdB(1)

Die Empfindlichkeit des Pocken lautsprechers reicht von 88 bis 93 dB, und die Nennleistung beträgt 3 bis 10 W. Berechnet durch 90dB/8W beträgt der Schalldruck pegel bei 8m vom Lautsprecher entfernt etwa 81dB. Der Beitrag der früh reflektierten Klang gruppe wird in der obigen Berechnung nicht berücksicht igt. Indoor kann der Beitrag der frühen reflektierten Klang gruppe und benachbarter Lautsprecher den Schalldruck pegel um etwa 2-3 dB erhöhen.

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").

Es gibt grunds ätzlich keine frühen reflektieren den Klang gruppen in Außenbereichen und die effektive Abdeckung einer einzelnenSprecher der öffentlichen Ansprache 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.

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