Sound Wave Microphone Authentication in Closed Spaces

The patent applies local quality by creating a localized authentication field using sound waves that are confined to a specific spatial region (closed space). The sound wave authentication information is transmitted only within the enclosed area defined by the sound emitting device and sound collecting devices, making the authentication scope local rather than global. This allows convenient wireless communication while ensuring that only devices within the specific space can authenticate, thereby improving authentication reliability.

The patent uses sound waves as an intermediary medium for authentication between devices. Instead of direct electrical or wireless connections that are hard to control, the sound wave acts as a mediator that naturally confines authentication information to a physical space. The sound collecting device receives authentication information through sound waves, and the sound emitting device transmits authentication information via sound waves, creating a controlled authentication channel that balances convenience with reliability.

The patent applies universality by enabling any sound collecting device within the closed space to participate in authentication using the same sound wave-based mechanism. The authentication system is designed so that multiple devices can be authenticated without requiring device-specific complex authentication protocols. Each device simply needs to receive and respond to sound wave authentication information, providing functional versatility while maintaining relatively simple authentication procedures for each individual device.

The patent segments the authentication process into distinct phases: authentication information transmission by the sound emitting device, reception by sound collecting devices, and authentication decision-making. This segmentation allows multiple devices to be authenticated independently through the same process, reducing overall system complexity. The authentication information is transmitted as separate sound wave signals that can be received by multiple devices simultaneously, avoiding the need for complex multi-device authentication coordination.

The patent applies local quality by confining the authentication field to a specific closed space. The sound wave-based authentication naturally limits its reach to the enclosed area, providing device accessibility within that space while maintaining security. The physical boundary of the closed space acts as a natural barrier that prevents unauthorized devices outside the space from receiving or transmitting authentication information, thus balancing accessibility with security.

The patent transitions from traditional two-dimensional wireless authentication to a three-dimensional sound wave-based authentication that utilizes spatial confinement. By embedding authentication information in sound waves that propagate through the third dimension (vertically and laterally within the enclosed space), the system creates a volumetric authentication field. This dimensional approach allows broad accessibility within the space while the physical boundaries of the space provide automatic security filtering for unauthorized external devices.