Theremin is an earlyelectronic musical instrument controlled without physical contact by the thereminist (performer). It is named after the westernized name of its Russian inventor, Léon Theremin, who patented the device in 1928.
The instrument's controlling section usually consists of two metal antennas which sense the relative position of the thereminist's hands and controloscillators for frequency with one hand, and amplitude (volume) with the other. The electric signals from the theremin are amplified and sent to aloudspeaker.
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