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 signals from one frequency range into another, and is also involved in the processes of modulation and demodulation.[2][4] The two input frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer.[2]
In the most common application, two signals at frequencies f1 and f2 are mixed, creating two new signals, one at the sum of the two frequencies f1 + f2, and the other at the difference between the two frequencies f1 − f2.[3] The new signal frequencies are called heterodynes. Typically, only one of the heterodynes is required and the other signal is filtered out of the output of the mixer. Heterodyne frequencies are related to the phenomenon of "beats" in acoustics.[2][5][6]
A major application of the heterodyne process is in the superheterodyne radio receiver circuit, which is used in virtually all modern radio receivers.
- ^ Christopher E. Cooper (January 2001). Physics. Fitzroy Dearborn Publishers. pp. 25–. ISBN 978-1-57958-358-3.
- ^ a b Graf, Rudolf F. (1999). Modern dictionary of electronics (7th ed.). USA: Newnes. p. 344. ISBN 978-0-7506-9866-5.
- ^ Horowitz, Paul; Hill, Winfield (1989). The Art of Electronics (2nd ed.). London: Cambridge University Press. pp. 885, 897. ISBN 978-0-521-37095-0.
- ^ Strange, Allen; Strange, Patricia (2003). The Contemporary Violin: Extended Performance Techniques. Scarecrow Press. p. 216. ISBN 978-0-520-22409-4.
- ^ Ingard, Uno (2008). Acoustics. Jones and Bartlett. pp. 18–21. ISBN 978-1-934015-08-7.