Introduction
For this work progress 1, I focus on understanding the background study and problem statement of this project. Besides, I also search on research papers that can help me in completing my projects. I will divide my work into two parts which first part is the background study and problem statement while the other part is the research papers that I collected.
Background study and problem statement
In classroom, speech intelligibility is measured to identify the acoustical behavior in a classroom. There are many acoustical factors that affect speech intelligibility such as Sound Transmission Index (STI), Reverberation Time (RT), Sound Clarity, Definition, Initial Time Delay Gap (ITDG), Sound Pressure Level (SPL), Sound Intensity Level (SIL), Sound Power Level (SWL) and much more. However, this project focus on understanding the sound reflection behavior which can be analyze using Sound Pressure level and Reverberation Time. Sound pressure level is the effect of pressure in the air achieved by the sound wave while Reverberation time (RT) is the time of the sound pressure level to decay. The relationship of RT and SPL can be seen as figure 1
Figure 1: Sound Pressure Level vs Time (Reverberation Time, 2022)
As can be seen in RT60 is referred to the time taken for the sound pressure level to decay by 60dB. "60" in RT referred to how much dB required to decay.
Usually, Sound Level Meter (SLM) is used to analyze acoustical factors such as SPL in a classroom. However, it takes time to setup the SLM and the price is expensive. Therefore, this project uses alternative approach by using Digital Audio Tape (DAT). Using DAT is so much faster because it requires less setup and settings. Besides, the price is less expensive and much more portable. The sound wave recorded by DAT also can be used for further analysis.