THE EFFECTS OF TEMPORAL AND SPECTRAL COMBINATIONS ON THE JUDGED NOISINESS OF AIRCRAFT SOUNDS

Abstract

Tests were performed in an anechoic chamber using college students to determine the judged noisiness of stimuli varying both temporally and spectrally. The investigations were divided into three test series. The first test series used thirty stimuli with six different time patterns and five different spectra. The second test used stimuli selected from the first test but modified to include signal durations ranging from 1 to 100 seconds. Duration in this case is the amount of time the stimuli were within 10 dB of the maximum level. The stimuli for the third test consisted of recordings of turboprop, turbofan, turbojet and helicopter flyovers.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1969
Accession Number
AD0712734

Entities

People

  • Karl S. Pearsons
  • Ricarda L. Bennett

Organizations

  • BBN Technologies

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Absorption
  • Aircraft Equipment
  • Aircraft Noise
  • Aircrafts
  • Anechoic Chambers
  • Chambers
  • Equations
  • Frequency Bands
  • Helicopters
  • Jet Aircraft
  • Measurement
  • Plastic Explosives
  • Recording Systems
  • Short Takeoff Aircraft
  • Sound Pressure
  • Transport Aircraft
  • Turbojet Engines

Readers

  • Acoustics.
  • Aerospace Engineering
  • Mathematics or Statistics