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An interdisciplinary research team made up of acoustics specialists and control system engineers from Munich University of Applied Sciences (UAS) has developed a method and a product that will make electric motors "sing." The motors are transformed into loudspeakers to ensure that the cars can be heard in traffic. They literally play music. Using the Active Sound Generation (ASG) method, the researchers investigated opportunities for using the drive system of electric motors to generate sound. The electricity supply to the motor is modulated in such a way that the motor makes small movements both in the direction of rotation and in a radial direction, in addition to its normal rotation. The slight to-and-fro movement that the researchers have produced is invisible to the naked eye, but it makes the motor housing vibrate and produce sound waves. The motor then begins to "sing." The brain needed to generate the sound is a real-time hardware system for activating the electric motor. The hardware can be connected to any type of audio device, for example a smartphone or an MP3 player, and it converts the audio signals into control signals which make the electric motor vibrate.
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