Theremin (redirected from Termenvox)

Theremin 

(etherophone), an electrophonic musical instrument, invented in 1921 by the Soviet engineer L. S. Termen. In order to produce a musical tone, the theremin makes use of audio-frequency electrical oscillations produced by a vacuum-tube generator; the oscillations are amplified and then converted into sound by a loudspeaker. An upright, metal rod attached to a metal arc is used to change the frequency and amplitude of the oscillations generated (the pitch and loudness of the sound); the rod and arc serve as the generator’s oscillatory system. The performer controls the theremin by changing the position of the palms of his hands: the hand near the rod controls the pitch, and the hand near the arc controls loudness. The theremin can be made to sound like a violin, cello, flute, or other musical instrument; the timbre of the sound is determined by the operating mode of the generator.