What does demodulation mean?
Demodulation is the process by which the original information — such as sound, images, or data — is recovered from a modulated carrier wave. When a signal is transmitted over radio, television, satellite, or wired networks, it is first superimposed on a higher-frequency carrier through modulation so that it can travel efficiently. Demodulation, performed at the receiving end by a circuit known as a demodulator, reverses this process: it strips away the carrier and reconstructs the message in its original form. The term is chiefly technical, appearing in electronics, telecommunications, and signal-processing contexts rather than casual speech. Its everyday importance is hard to overstate, however: every broadcast received, phone call placed, and Wi-Fi packet delivered depends on some form of demodulation. Different techniques exist for different schemes, including envelope detection for amplitude-modulated signals and coherent methods for frequency- or phase-modulated ones.
nounThe process of extracting the original information-bearing signal from a modulated carrier wave, typically in radio, telecommunications, or data transmission. It is the reverse operation of modulation.
- In electronics and telecommunications: the recovery of the original information signal from a modulated carrier wave (the reverse of modulation).
"The receiver performs demodulation to recover the audio signal embedded in the radio wave."
"Accurate demodulation is essential for clear reception of digital television broadcasts."
"The engineer adjusted the demodulation parameters until the distorted audio resolved into speech."
Rarely used; the plural appears mainly when comparing different demodulation techniques or instances across systems.
"The paper compared the demodulations achieved by several receiver architectures."
Every song you stream and every call you make survives its journey by riding a carrier wave — and only demodulation lets it climb back off.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of demodulation
Demodulation derives from the Latin root modus, meaning 'measure' or 'manner', which gave rise to the verb 'modulate' (to regulate or vary). The prefix de-, indicating reversal, was combined with 'modulation' in the early twentieth century as radio engineering matured, forming a term that precisely mirrors its counterpart: just as modulation imposes information on a carrier, demodulation removes it again. Related words sharing the same Latin root include 'module', 'modular', and 'moderate', all carrying the underlying sense of measure or standard.
Related word forms
How demodulation is actually used
A technical term used almost exclusively in engineering, physics, and telecommunications contexts; rare in everyday conversation. Countable in reference to specific instances or types ('a demodulation scheme'), uncountable when referring to the process generally.
Easily confused with demodulation
Modulation is the process of encoding information onto a carrier wave; demodulation is the reverse process of recovering that information at the receiver.