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http://www.google.com.au/patents/US3673331?utm_source=gb-gplus-share
Patent US3673331 - IDENTITY VERIFICATION BY VOICE SIGNALS IN THE FREQUENCY DOMAIN
IDENTITY VERIFICATION BY VOICE SIGNALS IN THE FREQUENCY DOMAIN
George D. Hair et al
Overview
Abstract
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Description
Claims
Patent number
: 3673331
Filing date
: 19 Jan 1970
Issue date
: 27 Jun 1972
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