Ferrari is attempting to recreate exhaust noises in its electric vehicles.
The development stems from customers' worries that an EV fleet would silence the automaker's signature sound.
According to CarBuzz, Ferrari filed a patent with the USPTO to give its EVs a sound similar to its ICE predecessors.
The process involves adding a "sonority current" to the electric motor's power supply.
The sonority current would create a hum with volume representative of the motor's rotational speed.
A resonator on the motor or transmission housing could amplify the volume.
The addition would allow for various frequencies and not interfere with the motor's operations.
Ferrari announced last June that it plans to present its first electric car in 2025.
