College of Engineering, Architecture, Fine Arts and Computing Sciences ECE/ ICE/ MexE Department
Public Address System
Castillote, Mari Kirby C.
Magpantay, Mara Charmaine
Mauhay, Jake C.
Samortin, John Patrick
Sulit, Christine Aira M.
Engr. Ralph Gerard Sangalang
May 23, 2013
This project would not have been possible without the guidance and the help of several individuals who in one way or another contributed and extended their valuable assistance in the preparation and completion of this study. First and foremost we take this opportunity to express our profound gratitude and deep regards to our guide, Engr. Ralph Gerard B. Sangalang for his exemplary guidance, monitoring and constant encouragement throughout the course of this research. The blessing, help and guidance given by him time to time shall carry us a long way in the journey of life on which we are about to embark. Last but not the least, our parents, brother, sisters and friends and the one above all of us, the omnipresent God, for answering our prayers for giving us the strength to plod on despite our constitution wanting to give up and throw in the towel, thank you so much Dear Lord.
There had been a number of projects that focuses on the important aspects of a Public Addressing System. This study was then conducted in order to understand and appreciate the working principles of PA systems from their construction, functions and daily applications. Specifically, this research aimed to identify the role and reliability of PA Systems. A Public Address (PA) system is a collection of audio equipment that allows broadcasts over a designated area. Often found in schools and office buildings, PA systems can be used for general announcements or emergency information, providing a simple way to get information out quickly. Basic PA systems are comprised of loudspeakers placed in convenient locations around a broadcasting area, an amplifier to increase the sound, and a mixer that adjusts audio levels. The user speaks into a microphone, and the sound is transmitted through connected cables, or a wireless system, out through the speakers. Some systems also include microphones or intercoms near the speaker locations, allowing the listener to reply to the central location. These responses are not broadcast to the entire system, however, but only to the main user area. Many schools use a PA system to broadcast daily announcements about school activities, and often let students use it to give reports or announce special events. The device can also function as an emergency warning system. In case of fires, earthquakes or other natural disasters, administrators often use a PA system to instruct students and teachers on where to go and how to respond. With the tragic rise in school shootings in the early 21st Century, many schools have installed special emergency warnings through these systems to alert students and staff about a violent attack on the campus. This type of public announcement hardware provides someone with extremely limited broadcasting range, often including only a single speaker, but still serves to amplify the user's voice. CHAPTER I: INTRODUCTION TO THE RESEARCH
A public address amplifier raises the volume of speech so people can be heard clearly in a large area or throughout a building. Inputs feed from one or more microphones through the device, which increases the power of the signal. The amplifier pushes the signal to outputs which relay the speech through speakers or horns, depending on the design of the system. Some systems are very complex and provide coverage throughout a building or complex, while others are small and mobile, designed for activities like giving lectures in classrooms or public facilities. At a minimum, the public address amplifier has at least one microphone input and a...