##### Heterodyne 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. Heterodyning is used to shift signals from one frequency range into another, and is also involved in the processes of [[modulation]]  and [[detection|demodulation]] . The two input [[frequency|frequencies]] are combined in A nonlinear signal-processing device such as a vacuum tube, [[transistor]], or [[diode]], usually called a mixer. [[Superheterodyne]] is this process done in the [[radio frequency]] range. >Covered in: >Mentioned in: >References: [[WP Heterodyne|🌍]] >Required by: > >Related to: