The use of A-weighted noise spectrum has gained widespread acceptance. The A-weighting produces a measure of the loudness of a sound as opposed to the annoyance measured by PNL (Perceived Noise Level). Following a background information on the acoustical concepts of loudness and noisiness, the paper describes four airport noise classification systems referred to as CNR (Composite Noise Rating), NEF (Noise Exposure Forecast), Ldn (Day-Night Level), and ASDS (Aircraft Sound Description System). The CNR system is based on PNL as the fundamental measure of annoyance, while NEF uses effective PNL as the basic noise unit. The two A-weighted systems, Ldn and ASDS, are developed in an attempt to simplify the concepts involved in noise classification, and yet maintain a reasonably objective and effective system. The salient features of the comparisons made is that there are really only minor differences in these various approaches to airport noise classification. These differences are mainly the result of rather arbitrary determination of the relative effect of daytime as compared to nighttime operations.

  • Supplemental Notes:
    • 8th Annual Southeastern Symposium on System Theory, Knoxville, Tennessee, April 26-27, 1976.
  • Corporate Authors:

    Institute of Electrical and Electronics Engineers (IEEE)

    3 Park Avenue, 17th Floor
    New York, NY  United States  10016-5997
  • Authors:
    • Elbert, T F
  • Conference:
  • Publication Date: 1976

Media Info

  • Features: References;
  • Pagination: p. 320-326

Subject/Index Terms

Filing Info

  • Accession Number: 00155778
  • Record Type: Publication
  • Source Agency: International Aerospace Abstracts
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Sep 28 1977 12:00AM