Nowadays, engine sound enhancement technologies have generally used to improve the sporty character of internal combustion engine sounds. This technique is generally based on a vehicle audio system. The audio amplifier or external controller has received the engine information via the engine control unit and has generating engine sounds by using speakers in the cabin.
In this work, we present the smartphone-based engine sound enhancing system that can replace the controller of the vehicle. Driving information about the vehicle was acquired through the wireless CAN-BUS communication device. And each corresponding order component sounds were synchronized along to engine revolution and generated. Next, the synthesized sound was reproduced considering the system delay and the transfer function of the cabin. The developed algorithm was implemented as a smartphone app that can also tune the volume and timbre. Finally, this system was successfully implemented and verified to the real vehicle.