As technology stills increasing all over the world, the researcher thought of how to implement something which may be useful in needed instead of going on foreign markets to buy it; that is a siren which may act or sound like a police siren with a sound very similar to it. This study measures the acoustic characteristics of an innovative low frequency police siren technology. Data collection comes during interview with road users, people around and villager in which the road pass through. The result and the findings during investigation made by the researcher push further to design a police siren’s low frequency emissions which can travel further and have a greater ability to penetrate and induce structure-bone excitation in nearby vehicle cabins. In this study the researcher try to find a system that can generates variable audible sounds in emergency situation. The researcher found that the system design consists of electronics components such as 555 timer ICS, D .C supply, and out put transducer (loudspeaker) which are assembled and interconnected to generate an oscillating signal. The result is a better ability to warn both nearby vehicles and pedestrians thus lessening the potential of emergency vehicle collisions. The system design were evaluated using three measurement scenarios to determine acoustic localization characteristics, drive-by effectiveness and the ability to overcome the problem shadowing phenomenon typical at congested intersections. The researcher found that It is not only for police cars where that sound is so important but also in homes where there may be a need to give an alert when there is a thief for instance. It may be sold also for cars which deserve to be like ambulances although the city of Kigali should recommend the usefulness of such alarm because the population are not familiar of using such kind of device that may give an answer to any solution.
Keywords: Siren, Ambulance, High-pitched, Nuisance, Decibel, Frequency, Piercing
Author: NSENGAMUNGU Herman