Frequencychange
Frequencychange, often written as frequency change, is the alteration of the rate at which a periodic phenomenon occurs, expressed as a change in frequency f, measured in hertz. In engineering and science, frequency changes can be intentional or unintentional, continuous or discrete, and may affect timing, signaling, or perception.
Intentional frequency changes are implemented with modulation (frequency modulation FM, or frequency-shift keying FSK) or via
Frequency is measured with frequency counters, spectrum analyzers, or phase-locked loops; instantaneous frequency can be estimated
In communications, frequency changes enable modulation, channel selection, and radar/chirp signaling; in metrology, stable reference frequencies
Challenges related to frequencychange include maintaining stability and minimizing drift and jitter under varying environmental conditions.