The Soundless Horn

A project was pitched to Maruthi Suzuki (A popular car manufacturer in India) called "the soundless horn". The primary purpose of this product is to reduce noise pollution due to the unnecessary honking of vehicles on roads. Our solution is to make the horn inaudible to people outside a car, but audible only to passengers inside the car. We achieved this by making the horn sound travel in ultrasonic frequencies. However, when it reaches a car, it is converted into audible acoustic soundwaves that are then heard only by the passengers in the car. What makes our system cost-efficient is a very simple process of frequency conversion from acoustic to ultrasonic sound waves. 

Patent filed with application number: 201941044334