What does modulation mean?
Modulation means the deliberate adjustment or variation of something, most often the pitch, volume, or tonal quality of a voice or the character of a musical sound. A singer may use modulation for expressive effect, while a composer may move a melody from one key or tonal center to another. In radio, sound control, and telecommunications, modulation has a more technical meaning: a carrier wave is varied in frequency, amplitude, or phase so that it can carry information. The word therefore suggests controlled change rather than random fluctuation, and it often carries a formal or technical tone, although its musical and vocal uses are widely understood. Because it applies both to expressive shaping and signal encoding, modulation is a useful word for the broader idea of changing a form or quality while preserving its underlying purpose. It is closely related to module and modulus, all deriving from the same Latin language of measurement.
nounThe controlled variation of a voice, sound, musical phrase, or signal, especially in pitch, volume, or tone. In music it can also mean a transition between keys or tonal centers, while in telecommunications it refers to varying a carrier wave to encode information.
- The controlled variation of pitch, volume, tone, or quality in a voice, musical sound, or other acoustic signal.
- The varying of a carrier wave's frequency, amplitude, or phase to encode or transmit information.
- A transition from one key or tonal center to another in music.
- The general process of adjusting or varying something in a controlled manner.
"The singer used subtle vocal modulation to give the final line a more intimate quality."
"Gentle vocal modulation brought warmth and intimacy to the performance."
"The transmitter uses frequency modulation to encode the voice signal."
The plural is used for separate acts, methods, or instances of modulation, particularly in music, speech, and technical analysis.
"The recording was praised for its subtle modulations of pace and volume."
One word links a singer's expressive turn and the invisible signal carrying your voice across a radio wave.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does modulation come from?
The English word comes through French from Latin modulari, meaning to measure according to a modulus or to regulate by measure. Modulus itself comes from Latin modulus, meaning a small measure, and the same root produced module and modular. Early uses concerned proportion, adjustment, and moderation; the vocal and musical senses developed later, while signal modulation became important with modern communications.
Related word forms
How modulation is actually used
The musical and vocal senses are familiar in both British and American English, while the telecommunications sense is more technical. The word generally implies deliberate or controlled variation and is more specialized or formal than simple change.
Easily confused with modulation
Modulation means controlled variation or adjustment, whereas moderation means avoiding excess or keeping something within reasonable limits.