frequency modulation

This term refers to a specific technical process in telecommunications and electronics. It is primarily used in professional, scientific, and engineering contexts to describe a method of signal transmission that is more resistant to noise than amplitude modulation. In common parlance, it is almost exclusively referred to by its abbreviation, FM, as in FM radio.

As a technical compound noun describing a specific physical process, the term is treated as uncountable. It refers to the concept or the method itself rather than a discrete object that can be counted.