#interference__noise__disturbance  electrical or acoustic activity that can disturb communication
  supertype:  #trouble  an event causing distress or pain; "what is the trouble?"; "heart trouble"
  subtype:  #background_signal__background  extraneous signals that can be confused with the phenomenon to be observed or measured; "they got a bad connection and could hardly hear one another over the background signals"
     subtype:  #background_noise__ground_noise  extraneous noise contaminating sound measurements that cannot be separated from the desired signal
        subtype:  #surface_noise__surfacenoise  noise produced by the friction of the stylus of a record player moving over the rotating record
     subtype:  #background_radiation  radiation coming from sources other than those being observed
  subtype:  #crosstalk__XT  the presence of an unwanted signal via an accidental coupling
  subtype:  #fadeout  a gradual temporary loss of a transmitted signal due to electrical disturbances
  subtype:  #jitter  small rapid variations in a waveform resulting from fluctuations in the voltage supply or mechanical vibrations or other sources
  subtype:  #atmospheric_static__atmosphericstatic__static__atmospherics  a crackling or hissing noise cause by electrical interference
     subtype:  #radio_noise__radionoise  static at radio wavelengths

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