
In many radio and audio applications, odd-order IMPs are of most interest, as they fall within the vicinity of the original frequency components, and may therefore interfere with the desired behaviour. ==Passive Intermodulation (PIM)== As explained in a previous section, intermodulation can only occur in non-linear systems. Non-linear systems are ...
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http://en.wikipedia.org/wiki/Intermodulation

a process occurring in a non-linear device or transmission medium whereby the spectral components of the input signal or signals interact to produce new components having frequencies equal to linear combinations with integral coefficients of the frequencies of the input components NOTE - Intermodulation may result from a single non-sinusoidaI input...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=161-06-20

process occurring in a non-linear device or transmission medium whereby the spectral components of the input signal or signals interact to produce new components having frequencies equal to linear combinations with integral coefficients of the frequencies of the input components NOTE - Intermodulation may result from a single non-sinusoidal input s...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=713-09-08

The modulation of different frequencies by each other, resulting in waves having frequencies equal to the sums and differences of integral multiples of the original frequencies.
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https://www.encyclo.co.uk/local/20757

the production in an electrical device of frequencies that are the sums or differences of frequencies of different inputs or of their harmonics.
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https://www.infoplease.com/dictionary/intermodulation
No exact match found.