Noise Data

This page contains different noise data measured in field by Speech Research Unit (SRU) at Institute for Perception-TNO, Netherlands, United Kingdom, under the project number 2589-SAM (Feb. 1990). All files listed below have duration of 235 seconds and are acquired by considering a sampling rate of 19.98 KHz, an analog to digital converter (A/D) with 16 bits, an anti-aliasing filter, and without a pre-emphasis stage.

  • White Noise acquired by sampling a high-quality analog noise generator (Wandel & Goltermann), which results in equal energy per Hz bandwidth.
  • Pink Noise acquired by sampling a high-quality analog noise generator (Wandel & Goltermann), yielding equal energy per 1/3 octave.
  • Speech Babble acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). The source of this babble is 100 people speaking in a canteen. The room radius is over two meters; therefore, individual voices are slightly audible. The sound level during the recording process was 88 dBA.
  • Factory Floor Noise 1 acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). This noise was recorded near plate-cutting and electrical welding equipment.
  • Factory Floor Noise 2 acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). This noise was recorded in a car production hall.
  • Cockpit Noise 1 (Buccaneer Jet Traveling at 190 knots) acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). The Buccaneer jet was moving at a speed of 190 knots, and an altitude of 1000 feet, with airbrakes out. The sound level during the recording process was 109 dBA.
  • Cockpit Noise 2 (Buccaneer Jet Traveling at 450 knots) acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). The Buccaneer was moving at a speed of 450 knots, and an altitude of 300 feet. The sound level during the recording process was 116 dBA.
  • Cockpit Noise 3 (F-16) acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). The noise was recorded at the co-pilot's seat in a two-seat F-16, traveling at a speed of 500 knots, and an altitude of 300-600 feet. The sound level during the recording process was 103 dBA. It was found that the flight condition had only a minor effect on the noise and, therefore, the reproduced noise can be considered to be representative.
  • Engine Room Noise (Destroyer) acquired by recording samples from microphone onto digital audio tape (DAT). The sound level during the recording process was 101 dBA.
  • Operations Room Background Noise (Destroyer) acquired by recording samples from microphone onto digital audio tape (DAT). The sound level during the recording process was 70 dBA.
  • Military Vehicle Noise (Leopard) acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). The Leopard 1 vehicle was moving at a speed of 70 km/h. The sound level during the recording process was 114 dBA.
  • Military Vehicle Noise (M109) acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). The M109 tank was moving at a speed of 30 km/h. The sound level during the recording process was 100 dBA.
  • Machine Gun Noise acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). The weapon used was a .50 calibre gun fired repeatedly.
  • Vehicle Interior Noise (Volvo 340) acquired by recording samples from 1/2" B&K condensor microphone onto digital audio tape (DAT). This recording was made at 120 km/h, in 4th gear, on an asphalt road, in rainy conditions.
  • HF Channel Noise acquired from an HF radio channel after demodulation.

For more information, please contact Institute for Perception-TNO, PO-box 23, 3769 ZG Soesterberg, Netherlands.

All content provided in this page was formerly made available by Dr. Don H. Johnson at Rice University.

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