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Joint Speech and Hearing Group
And London Branch Evening Meeting
Assessing Speech Security for Confidential
Discussions in Meeting R765 Rooms
Professor Carl Hopkins,
University of Liverpool
Wednesday 16 October 2019 at 6 pm
WSP | Parsons Brinckerhoff, WSP House, 70 Chancery Lane, London, WC2A 1AF
Many organisations have meeting rooms where confidential discussions take place and speech security is important. This presentation concerns a simple figure of merit for a meeting room that accounts for the talker’s vocal effort, the transmission path and background noise near the listener. Different degrees of speech security are realised by defining a threshold of information leakage which is set according to security policy and is not specific to any particular room. It is used to set the maximum safe vocal effort level for which a covert listener may be aware of the talker’s voice and its cadence, but is only able to identify a certain percentage of words. For example, a meeting room could be specified where only 1% of words are identifiable when the talkers use a “raised” vocal effort level. This approach requires two new metrics, the maximum safe vocal effort level and the threshold of information leakage. Experiments are reported which establish a relationship between an objective measurement of the Speech Transmission Index and a subjective assessment relating to the threshold of information leakage.
The closest underground stations are Chancery Lane (Central line) and Holborn (Central & Piccadilly line).
Topics and speakers for the evening meetings are generally identified and organised by the London Branch Committee, but we always welcome new ideas and suggestions for future presentations. If you have any ideas or suggestions, or may even like to give a presentation yourself, please contact the London Branch Committee (Roslyn Andrews: Roslyn.Andrews@aecom.com)
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70 Chancery Lane