Definitions for intermodulation

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Wiktionary

  1. intermodulation(Noun)

    modulation of the different frequencies of interacting waves

Freebase

  1. Intermodulation

    Intermodulation or intermodulation distortion is the amplitude modulation of signals containing two or more different frequencies in a system with nonlinearities. The intermodulation between each frequency component will form additional signals at frequencies that are not just at harmonic frequencies of either, but also at the sum and difference frequencies of the original frequencies and at multiples of those sum and difference frequencies. Intermodulation is caused by non-linear behaviour of the signal processing being used. The theoretical outcome of these non-linearities can be calculated by generating a Volterra series of the characteristic, while the usual approximation of those non-linearities is obtained by generating a Taylor series. Intermodulation is rarely desirable in radio or audio processing, as it creates unwanted spurious emissions, often in the form of sidebands. For radio transmissions this increases the occupied bandwidth, leading to adjacent channel interference, which can reduce audio clarity or increase spectrum usage. It should not be confused with harmonic distortion, nor with intentional modulation where signals to be modulated are presented to an intentional nonlinear element. In audio, the intermodulation products are nonharmonically related to the input frequencies and therefore "off-key" with respect to the common Western musical scale.

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"intermodulation." Definitions.net. STANDS4 LLC, 2014. Web. 18 Dec. 2014. <http://www.definitions.net/definition/intermodulation>.

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