phase modulation

n. Abbr. pm or p-m A method of signal transmission in which the phase of a carrier wave is varied to transmit information contained in the signal.

phase modulation

n (Electronics) a type of modulation, used in communication systems, in which the phase of a radio carrier wave is varied by an amount proportional to the instantaneous amplitude of the modulating signal

phase′ modula`tion

n. radio transmission in which the carrier wave is modulated by changing its phase to transmit the amplitude and pitch of the signal. [1925–30]

Thesaurus

Noun

phase modulation - modulation of the phase of the carrier wavePMmodulation - (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase

phase modulation

phase modulation:

see modulationmodulation,
in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulating wave); demodulation is the process by which the original signal is recovered from the wave
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Phase Modulation

a method of modulating oscillations in which the transmitted signal controls the phase of a high-frequency carrier. The characteristics of phase modulation are similar to those of frequency modulation. If the modulating signal is sinusoidal, the spectra and wave forms of phase-modulated and frequency-modulated signals coincide. Differences between the two methods become apparent if the modulating signal has a more complex wave form.

phase modulation

[′fāz ‚mäj·ə‚lā·shən] (communications) Modulation in which the linearly increasing angle of a sine wave has added to it a phase angle that is proportional to the instantaneous value of the modulating signal (message to be communicated). Abbreviated PM.

phase modulation

A method of modulating a sine-wave carrier, so its phase is changed by an amount proportional to the instantaneous value of the modulating voltage.

phase modulation

Varying the angle of a wave in a carrier in order to transmit analog or digital data. For digital signals, phase modulation (PM) is widely used in conjunction with amplitude modulation (AM). For example, quadrature amplitude modulation (QAM) uses both phase and amplitude modulation to create different binary states for transmission (see QAM). See modulation and carrier.

Vary the Angle

In PM modulation, the angle of the carrier wave is varied by the incoming signal. In this example, the modulating wave implies an analog signal.

Digital Phase Shift Keying (PSK)

For digital signals, phase shift keying (PSK) uses two phases for 0 and 1 as in this example. See DPSK.

phase modulation

phase modulation

phase modulation

phase′ modula`tion

phase modulation

phase modulation:

Phase Modulation

phase modulation

phase modulation

phase modulation

phase modulation

Synonyms for phase modulation

noun modulation of the phase of the carrier wave

Synonyms

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