Computer Science - Computer Fundamentals - Discussion

A transducer is a device that converts a signal in one form of energy to another form of energy. Energy types include (but are not limited to) electrical, mechanical, electromagnetic (including light), chemical, acoustic and thermal energy. While the term transducer commonly implies the use of a sensor/detector, any device which converts energy can be considered a transducer. Transducers are widely used in measuring instruments.

Well, Modem also converts analog signals to digital. How could it not be a good answer? Just curious :).

Modem just converts analog signals to digital signals and vice-versa. The question is not limited to just this type of signals.

So the correct answer should be Transducer.