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-> „Als Lärm bezeichnet man Schallempfindungen, die störend,
      belästigend od. unangenehm sind und gesundheitsschädigend
      sein können.“     (Frieling & Sonntag, 1999, S. 108)

-> „The term (noise) has at least three meanings:
            (1) a sound which one does not want to hear
            (2) a sound varying randomly and aperiodically in intesity     
                  and frequency, and
            (3) a sound which interferes with the reception of another
                   (i.e. masks it).“
                                                  (Smith & Jones, 1992)