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The authors discuss concepts used in developing the CSC (Correctional Services Canada) Duress Alarm Location System (DALS). A block diagram and theory of operation for the system are presented. A sample data and test results for an actual test installation are presented and analyzed. It is concluded that the DALS is able to acknowledge and locate a duress alarm within an indoor environment with useful precision and reliability.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Christ et al. (1993) studied this question.