Project Abstract

Abstract
Police sirens are essential components of law enforcement vehicles, providing both audible and visual signals to alert other road users and pedestrians of an emergency situation. The construction and design of police sirens require careful consideration of various factors to ensure optimal functionality and effectiveness in different scenarios. This research project focuses on the construction and design of police sirens, aiming to improve the performance and efficiency of these critical law enforcement tools. The study explores the key components of police sirens, including the siren speaker, control module, amplifier, and power source. By understanding the role of each component and their interactions, the research aims to optimize the overall design for enhanced functionality. In addition to the individual components, the research also delves into the importance of sound frequency, volume control, and siren patterns in police siren design. By analyzing different sound frequencies and volume levels, the study aims to determine the most effective combinations for different situations, such as high-speed pursuits or traffic control. Furthermore, the project investigates the impact of siren design on public response and safety. The study considers factors such as siren pitch, intensity, and duration in relation to driver reaction times and pedestrian awareness. By examining how different siren designs influence human behavior, the research aims to develop recommendations for optimizing police sirens to maximize their effectiveness in emergency situations. The research methodology includes a combination of theoretical analysis, computer simulations, and practical experiments. By integrating these approaches, the study aims to provide a comprehensive understanding of police siren construction and design principles. Through empirical testing and data analysis, the project seeks to validate the effectiveness of proposed design improvements and identify areas for further refinement. Overall, this research project contributes to the advancement of police siren technology by providing insights into the construction and design considerations essential for optimizing their performance. By enhancing the functionality and effectiveness of police sirens, law enforcement agencies can improve emergency response capabilities and enhance public safety on the roads.

Project Overview

      INTRODUCTION
1.1 OVERVIEW
            A siren is a loud noise making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulance, police cars and fire trucks. There are two general types of siren:

1-Pneumatic Siren
2-Electronic Siren
Many fire sirens (used for calling the volunteer fire fighters) serve double duty astornado or civil defense sirens, alerting an entire community of impending danger. Most fire sirens are either mounted on the roof of a fire station, or on a pole next to the fire station. Fire sirens can also be mounted on or near government buildings, on tall structures such as water towers as well as in systems, where several sirens are distributed around a town for better sound coverage. Most fire sirens are single tone and mechanically driven by electric motors with a rotor attached to the shaft. Some newer sirens are electronically driven by speakers. Though, these are not as common.
Fire sirens are often called “fire whistles”, “fire alarms”, or “fire horns.” Although there is no standard signaling of fire sirens, some utilize codes to inform fire fighters of the location of the fire. Civil defence sirens pulling double duty as a fire siren often can produce an alternating “hi-b” signal (similar to a British police car) as the fire signal, or a slow wail (typically 3x) as to not confuse the public with the standard civil defense signals of alert (steady tone) and attack (fast wavering tone). Fire sirens are often blasted once a day at noon and are also called “noon sirens” or ‘noon whistles”.
Pneumatic Siren consists of a rotating disk with holes in it such that the material between the holes interrupts a flow of air from fixed holes on the outside of the unit. As the holes in the rotating disk alternately prevent and allow air to flow it results on alternating compressed and rarefied air pressure i.e. sound. It consumes large amount of energy.
Electronic Siren incorporate circuits such as oscillators, modulators and amplifiers it synthesize a selected tone which is played through external speakers. It is not unusual especially in the case of modern engines, to see an emergency vehicle equipped with both types of siren.
1.2 PROJECT OBJECTIVE
          The main objective of this project is to implement Electronic Siren in both the software and hardware version. We are going to learn the PCB designing, Proteus software handling in an effective manner. At the end of this project student will be able to learn all these things. Electronic Siren is basically high-performance sound signal electronic amplifiers. These siren works with substantially higher outputs and specific demand are placed on them in terms of desired extreme reliability and different methods of control on them. Moreover control infrastructure must also be reliable and usually two independent control channels are required.
The loudspeakers for these amplifiers are placed in specially- designed sound battles and they play the signals stored in the siren’s digital memory or signals fed to the siren from external sources.
1.3 FUTURE SCOPE
It is possible to add an external signal source with these devices. Moreover it provides enhanced automatic testing. It is employed at user friendly level easily. In industry it will be a great advantage to the people.