- a modulating or being modulated; specif.,
- Music a shifting from one key to another
- Radio a variation in the amplitude, frequency, or phase of a wave in accordance with some signal
- a variation in stress or pitch in speaking, as in distinguishing between the merely auxiliary and the lexical uses of a word (Ex.: “There is a post office on Main Street,” as contrasted with “There is the post office”)
Origin of modulationMiddle English modulacioun from Classical Latin modulatio
- The act or process of modulating.
- The state of being modulated.
- Music a. A passing or transition from one key or tonality to another.b. The result of such a transition.
- a. A change in stress, pitch, loudness, or tone of the voice; an inflection of the voice.b. An instance of such a change or an inflection.
- The harmonious use of language, as in poetry or prose.
- Electronics The variation of a property of an electromagnetic wave or signal, such as its amplitude, frequency, or phase.
modulation - Computer Definition
Typically refers to the altering of a carrier wave in order to transmit a data signal (text, voice, audio, video, etc.) from one location to another via a discrete channel (see carrier). At the receiving end, a tuner latches onto the particular carrier frequency and a demodulator circuit isolates the data from the carrier. In analog telephony, modulation also refers to the altering of a DC current in order to transmit voice electronically. In such a conversation, both parties are modulating the current simultaneously. Amplitude, Frequency and Phase There are three basic types of modulation: amplitude modulation (AM) varies the voltage; frequency modulation (FM) varies the frequency, and phase modulation (PM) varies the angle of the wave (see amplitude modulation, frequency modulation and phase modulation). In quadrature amplitude modulation (QAM), both the amplitude and phase of the carrier are modified (see QAM).