The correlation of EDT and T30 result of YMEC measurement compared with RT sabine theory and eyring in semi-anechoic room in physics department Institut Teknologi Sepuluh Nopember

In the science of acoustics required two special rooms namely Reverberation Chamber and Anechoic Room. In Anechoic room is a free field from the reflection of sound so this room used to examine signals in audiosonics. one of which can be used to evaluate the noise of a machine and the analysis of acoustic materials. The calculation approach of Reverberation time is based on the semi-empirical formulation of Sabine and Eyring's theory. Measurement software used YMEC, can determine the time of buzzing EDT and T30. This research was conducted in semi-an echoic room department of physics ITS. From the measurement results obtained, cutoff frequency value of 23 Hz and critical frequency 200 Hz. The correlation of EDT and T30 results of Measurement of YMEC compared with the Reverberation time of Sabine and Eyring's Theory. Based on the measurement results obtained the corresponding reverberation time is EDT using Eyring theory approach method. Measurement T30 has almost the same value, but at 4000 Hz frequency experienced a significant increase. Reverberation time using the Sabine or Eyring theory has the same curve but for the value obtained Eyring theory is closer to the value of EDT.