Mechanical Duct Designs to Provide Speech Privacy

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Authors
  1. Quirt, J.D.
Corporate Authors
Canadian Police Research Centre, Ottawa Ont (CAN);National Research Council of Canada, Ottawa ONT (CAN)
Abstract
This report presents a design procedure to predict speech privacy between two rooms when sound is transmitted via an air-handling duct system. Extensive experiments were required to establish the basis for the design procedure. The measurements have clearly established the factors relevant for sound transmission along a duct between two rooms comparable to private offices, and it is believed the results can reasonably be extrapolated to larger rooms. This report presents a step-by-step design procedure based on the results of the experimental studies and published data from other sources. This problem has three main aspects, each of which is presented in one section of this report: 1. How much sound power enters the duct from a typical person speaking in the source room? 2. How much of that sound power is transmitted through the duct system? 3. How does intelligibility of the sound reaching the receiving room depend on receiver location and room characteristics?
Keywords
Air ducts -- Accoustic properties
Report Number
TR-05-91;TH7683.D8;TR-05-1991E — Technical Report
Date of publication
01 Oct 1991
Number of Pages
112
DSTKIM No
CA031173
CANDIS No
530029
Format(s):
Electronic Document(PDF)

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