Speech Interference Level

Der Speech Interference Level (SIL, dt. etwa „Sprachbeeinträchtigungsgröße“, ein deutscher Fachterminus für den SIL ist nicht in Gebrauch), ist eine akustische Kenngröße die die Beeinträchtigung der Sprachverständlichkeit durch Störgeräusche beschreiben soll.

Der SIL wird als arithmetische Mittel der linearen Schalldruckpegel in ausgewählten Oktavbändern gebildet.

Zwei Varianten des SIL sind gebräuchlich:

  • SIL3: Das arithmetische Mittel der linearen Schalldruckpegel in den 1-kHz-, 2-kHz- und 4-kHz-Oktaven
  • SIL4: Das arithmetische Mittel der linearen Schalldruckpegel in den 500 Hz, 1-kHz-, 2-kHz- und 4-kHz-Oktaven

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