The Noise Simulation Facility at DRDC Toronto – Room Acoustics and System Analysis

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Authors
  1. Nakashima, A.
  2. Borland, M.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
The Noise Simulation Facility and the Noise Library at DRDC Toronto are used to recreate the noise environments of various military operational settings. The Noise Simulation Facility (the Noise Lab) is a large room containing an array of speakers that enables the production of noise levels as high as 130 dB. The Noise Library is a collection of digital audio tapes containing recordings of noise that were made in various Canadian Forces land vehicles, aircraft and other operational settings. The acoustical characteristics of the Noise Lab and the quality of the digital audio tape recordings that have been modified for playback are largely unknown. To gain a better understanding of the accuracy to which the operational noise environments are modeled in the Noise Lab, the acoustical response at several different positions in the Noise Lab was measured, and spectral analyses of the noise recordings were performed. The presence of objects in the room was found to decrease the reverberation time at all frequencies compared to their absence. It was determined from the measurements that the over-amplification of low frequencies governed by the geometry of the Noise Lab could be reduced by adjusting the settings of a graphic equalizer and by moving the measurement location to an area where the effects of standing waves were minimized. Recommendations are made with regard to field measurement procedures that can help to improve the quality of the noise recordings and ensure accurate p

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Keywords
Noise simualtion facility;room acoustics;noise measurements;reverberation time;low-frequency noise
Report Number
DRDC-TORONTO-TR-2005-095 — Technical Report
Date of publication
01 Oct 2005
Number of Pages
83
DSTKIM No
CA026621
CANDIS No
524518
Format(s):
Electronic Document(PDF)

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