Voice Passphrase Access Control for Secure Building Entry

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Solution Overview

Problem

Existing call box systems in apartment buildings require residents to provide a telephone number or manually input a code for guests or deliveries, which can be inconvenient and insecure.

Innovation Solution

A backend system that allows residents to set a passphrase or access word, which is communicated through a call box and verified by the system to unlock doors, enhancing security and convenience.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If residents use traditional call box systems requiring telephone numbers or manual code input, then guests can gain access to the building, but security is compromised and convenience is reduced

Engineering Contradiction:

ImprovesecurityVSAvoidconvenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces traditional mechanical call box systems with voice recognition technology. Instead of requiring manual code input or telephone number entry, the system uses acoustic fields (voice passphrases) to authenticate guests and unlock doors, thereby improving both security and convenience simultaneously

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If residents manually input codes for each guest, then access control is maintained, but time is lost and operational complexity increases

Engineering Contradiction:

Improveaccess controlVSAvoidtime for code input

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system allows residents to pre-program multiple voice passphrases in advance for different guests. When a guest arrives, the resident simply asks the guest to speak their pre-programmed passphrase, eliminating the need for real-time code input and significantly reducing the time required for access control

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The voice recognition system enables automatic authentication without requiring manual code entry. The guest's voice itself serves as the key, and the system automatically verifies it against stored passphrases, making the access control process self-service and time-efficient

Inventive Principle:

Principle #25Self-service

3Ease of operation

If traditional call box systems are used, then basic access functionality is provided, but security vulnerabilities exist due to code sharing

Engineering Contradiction:

Improveaccess functionalityVSAvoidsecurity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system assigns unique voice passphrases to different guests, creating localized security credentials. Each guest has their own distinctive voice pattern stored in the system, so even if one guest's access information is compromised, other guests' voice-based authentication remains secure and cannot be transferred or shared

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12500982B2Remote access control

Publication Date: 2025.12.16 AMAZON TECH INC

AI summary

A system that allows a user to access a secured area by confirming location of the user near the secured area and receipt of an access word by the system. A user in possession of a mobile device may be detected at the entrance to a secured location. The system can select a question asking for a passcode corresponding to certain access to the secured location. The question can be spoken to a user through a loudspeaker at the secured location. The user's spoken response can be processed by the system, for example using keyword spotting, to determine if the proper access word is included. If it is, the system can grant access to the secured area.