| Intermodulation |
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Intermodulation or '''intermod''' is the result of two Radio Signals of different Frequencies being Mixed together, forming additional signals at frequencies that are not in general at Harmonic frequencies ( Integer Multiple s) of either. The largest intermodulation products appear at ''f1 + f2'' or ''f1 − f2'' (second-order intermodulation), and less so at 2''f1 − f2'' or 2''f2 − f1'' (third order intermodulation). The cause for intermodulation is the existence of Non-linear Characteristic s of the according Equipment . The Theoretical outcome of these nonlinearities can be Calculate d by conducting a Volterra Series of the characteristic, while the usual Approximation of those nonlinearities is obtained by conducting a Taylor Series . According to the Summands in those series, the above numbering of orders is counted. Intermodulation is rarely desirable in radio, as it essentially creates Spurious Emission s, which can create minor to severe Interference to other operations on the resulting frequency (See the Rusty Bolt Effect for more details). It may be desirable in Audio if the intent is to create specific Sound Effect s; for instance, intermodulation is the basis of the Power Chord technique in rock music. SEE ALSO EXTERNAL LINKS |
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