Voice-recognition elevator security system

A voice-controlled elevator security system, including at least one elevator car mounted in a building having a plurality of floors, including a lobby floor, wherein authorized users are each pre-enabled to gain access to a predetermined floor, or floors, of the building from the lobby floor and each authorized user has provided template utterances, said voice-controlled elevator security system comprising:

• first memory means for storing template utterances of authorized users, with said template utterances being represented by a plurality of binary bits;
• second memory means for storing preselected landings to which each authorized user is permitted access;
• digitizing means for digitizing a prospective user's spoken utterance, with the user's digitized spoken utterance being represented by a plurality of binary bits;
• recognition means for comparing the prospective user's digitized spoken utterance with at least certain of the template utterances, and for selecting a template utterance having the largest number of binary bits in agreement with the binary bits of the digitized spoken utterance;
• threshold means for establishing a threshold limit;
• comparator means for comparing the number of binary bits in agreement with said threshold limit and for producing an enable signal when the number of binary bits in agreement exceeds said threshold limit;
• said enable signal indicating that the prospective user is the authorized user associated with the selected template;
• and call selecting means responsive to said enable signal for enabling a recognized authorized user to gain access to an elevator car at the lobby floor;
• said call selecting means further being responsive to said enable signal for enabling the recognized authorized user to direct the accessed elevator car only to an associated pre-enabled floor;
• said call selecting means including landing selecting means in the at least one elevator car and up-call selecting means at the lobby floor, wherein activation of the voice controlled elevator security system disables the landing selecting means in the at least one elevator car, except the landing selecting means for the lobby floor, and disables the up-call selecting means on the lobby floor, and wherein identification of the user as an authorized user automatically activates the up-call selecting means on the lobby floor and enables the landing selecting means in the at least one elevator car for those floors to which the authorized user has been pre-enabled to gain access.