Perancangan Instrumentasi Monitoring Kualitas Akustik Ruangan Berdasarkan Tingkat Tekanan Bunyi dan Waktu Dengung

Abstract

The room acoustic measurement based on the sound pressure level and reverberation time was done in Al-WasiI mosque in Lampung University. The measurement of sound pressure level and reverberation time used 8 microphones which were connected to the internal soundcard of a laptop with a multiplexer as a data selector, while the acquisition system and signal processing used Matlab r2014a. The measurements were conducted in 64 points distributed inside the room. The measurement results for sound pressure level showed an average of 61,95 dB. The data of sound contour showed differences in each measured point of no more than 6 dB so that the sound pressure was evenly distributed. The reverberation time measurement result was 3,03 seconds, where this reverberation time far from optimal reverberation time of 0,90 to 1,20 seconds. The overall of acoustic quality in the praying room of Al-WasiI mosque in Lampung University was not good because it did not meet a proper acoustic sound requirements.