FYP2 WORK PROGRESS 2

For this work progress 2, I focus on recording sound signal. The first work is recording the sound signal at MP for PSD analysis and the second work is measuring background noise, Reverberation Time (RT60) and Sound Transmission Index (STI) at MP.

For this work, I work together with Mr. Fairuz, Mr. Rusydan and my friends, Haqim and Hilman. The procedure of this work is creating a sound source using flapper and record the sound using Real Wave Analyzer (RWA) at 12 MP in each Room Sample. The procedure is repeated but using Smartphone to record the sound. Before the work start, the distance from flapper to RWA and the distance of flapper opening must be constant. So, a quick experiment must be conducted first. 3 SPL measurement is taken in the middle of Room Sample 1 using Rion 97 by setting the distance from Rion to Flapper 2 meters and the distance of flapper opening is 2 feet. Then, take the standard deviation of the measurement at 500 and 1000Hz, if it is below 3dB then we can take the distance as the constant. Figure 1 below shows the reading, and we conclude to use this distance as the reference.

                                         Table 1: SPL Reading using Rion 97

After determine the constant distance, the audio signal is recorded for both Room Samples. The first 6 MP in Room Sample 1 was helped by Mr. Fairuz and Mr. Rusydan using RWA only. The rest of recording in Room Sample 1 was helped by Hilman using RWA and Smartphone. For Room Sample 2, all recording work was helped by Haqim using both Smartphone and RWA. The sound signal will captured at 3rd seconds and end at 10th second. All of the recordings are transferred to my laptop for further analysis.

                                   Figure 1: Recording Sound Signal

For this work, I work together with Dr to measure the background noise, RT60 and STI in both room samples. For background noise, 4-5 readings are taken at MP while all readings are taken at all MP for RT60 and STI. The sound signal used is Speaker and the readings was obtained using Symphony. These readings are taken to analyze the sound reflection pattern in room samples. However, the reading is still not extracted from Symphony. Figure 2 and 3 shows the reference number to obtain the readings for Room Sample 1 and 2.

                  Figure 2: Reference Number for Room Sample 1

                     Figure 3: Reference Number for Room Sample 2

                       Figure 4: Work Setup in Room Sample 1

                           Figure 5: Work Setup in Room Sample 2