Helgert, Hermann J. Department of Electrical and Computer Engineering, George Washington University, Washington, DC.
Last reviewed:January 2020
- Carrier signal specification
- Carrier modulation
- Spectrum and power characteristics
- Modulation devices
- Preemphasis and deemphasis
- Related Primary Literature
- Additional Reading
A technique used in telecommunications transmission systems whereby the instantaneous frequency of a carrier signal is determined by the characteristics of an information signal, the so-called modulating signal. Frequency modulation (FM) is a form of angle modulation. For systems in which the modulating signal is digital in nature, the term frequency-shift keying (FSK) is usually employed. See also: Angle modulation
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