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The Theremin has two very high frequency oscillators (around 350 kHz). One of them is fixed, and the other is varied by the capacitance of your hand: it's the difference between the two frequencies which decides the pitch.
29 Δεκ 2004 · The theremin is played by carefully moving your hands near 2 antennas, one for volume and one for pitch. But how does it work? If you mix the signals of 2 rf oscillators, you will get many output signals. The most important signals are the sum and difference of both frequencies.
Depending on your hand position and the adjustment of the instrument, the beat frequency can be anywhere from around 65 Hz to about 3 kHz (260 kHz minus 257 kHz). These are audio frequencies, and they correspond to a range that spans from about two octaves below middle C to about three-and-a-half octaves above middle C.
27 Ιουν 2024 · The complete JFET-based theremin circuit includes a second oscillator, a mixer, and a circuit for the volume antenna. The second oscillator is stabilized at 470 kHz by a ceramic resonator, and so it must be possible to set the adjustable oscillator to this frequency.
The theremin's sound is produced by the electronic principle of 'heterodyning' - when the frequency of the 'pitch' oscillator is subtracted from the frequency of a fixed oscillator, the resultant frequency produced falls within the range of human hearing, and this is what we hear through a speaker as sound.
Specifically, we leverage the fact that in the frequency ranges from 100 kHz to 40 MHz the electric field around the body behaves as a quasi-static near-field [36,3].
4 Ιουν 2024 · The theremin is a contactless electronic music instrument developed by Leon Theremin in 1920. It is a perfect example of the interdisciplinary character of music, allowing art and science to intersect. But how does a theremin work, and what does it sound like?
