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A heterodyne is a signal frequency that is created by combining or mixing two other frequencies using a signal processing technique called heterodyning, which was invented by Canadian inventor-engineer Reginald Fessenden.[1][2][3] Heterodyning is used to shift one frequency range into another, new frequency range, and is also involved in the processes of modulation and demodulation.[2][4] The two new frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer.[2]