I tried using an am radio right next to the project. Only on the lowest, static, AM frequency could I hear different pitches as I activated the motor. More importantly, I found that a motor that was also being used in this project, (that uses a motor controller and doesn't interfere with the video signal), makes a louder pitch in the radio. Basically I'm saying that one of the motors that doesn't cause any problems is actually a lot louder than the one that does. Both are pretty quiet though.