Intermodulation noise
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In a transmission path or device, Intermodulation noise is noise, generated during modulation and demodulation, that results from nonlinear characteristics in the path or device.
Intermodulation noise occurs when the frequency sum or difference of a particular signal, S1, interferes with the component frequency sum or difference of another signal, S2.
[edit] Example
Someone listening to a car radio while driving close by an AM or FM radio transmission tower may hear two types of 'interference' / distortion:
- 'break-through', where the transmission from the near station overwhelmes the car radio; and
- intermodulation, where another station entirely is heard (neither the station being listened to, or the nearby station, as a result of the mixing of the two signals.)
