Ultrasonic Proximity Access Control for Wireless Audio Systems
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Solution Overview
Problem
Existing wireless systems, such as Wi-Fi and Bluetooth, face challenges in controlling access to specific areas and ensuring seamless audio playback across multiple devices, as they often lack presence-based authentication and experience signal dropouts due to limited signal strength and coverage.
Innovation Solution
The use of ultrasonic signals to determine the proximity of devices to wireless systems, allowing access only within a defined area and automatically switching to better-receiving speakers for improved audio playback experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional WiFi authentication schemes are used, then access control is simplified, but the ability to limit access to intended area is lost
Solution Approach 1:
The patent introduces an intermediary mechanism using ultrasonic signals as a mediator between the mobile device and the WiFi authentication system. The speaker emits ultrasonic signals that the mobile device's microphone detects, creating a proximity-based verification layer without complicating the core WiFi authentication process. This mediator enables area-limited access while maintaining simple authentication操作流程.
2Reliability
If Bluetooth pairing is used for audio playback, then device connectivity is established, but signal dropouts occur when moving between rooms
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors ultrasonic signal strength to determine device proximity and signal quality. Based on this feedback, the system can automatically switch between multiple speakers or alert the user when signal dropouts are detected, maintaining reliable audio playback without manual intervention during movement between rooms.
Solution Approach 2:
The system dynamically adapts its behavior based on real-time signal conditions. When a device moves between rooms causing signal dropouts, the system can dynamically switch to alternative speakers with better signal reception or trigger notifications to the user, ensuring continuous and reliable audio playback experience without requiring manual reconnection.
3Adaptability or versatility
If multiple speakers are deployed for multiroom coverage, then audio availability is improved, but manual switching between speakers is required
Solution Approach 1:
The patent enables the audio system to serve itself by automatically selecting and switching between multiple speakers based on ultrasonic signal strength detection. The system monitors which speaker has the strongest signal to the mobile device and autonomously routes audio playback to that speaker without requiring user intervention, thereby providing seamless multiroom coverage while eliminating manual switching operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances access control and audio playback reliability by ensuring that devices within the intended area can connect securely and seamlessly switch to optimal speakers, reducing signal dropouts and improving user experience.
Implementation Method 1
One of the devices includes an acoustic transmitter being configured to transmit acoustic signals at least partially within the ultrasonic range
Implementation Method 2
the second of said devices includes an acoustic receiver configured to receive the transmitted acoustic signals in the same range
Data Source
AI summary
The present invention relates to a system for controlling access to an external device, including a first device and a second, external device, both including wireless communication units using a common communication protocol. One of said devices includes an acoustic transmitter being configured to transmit acoustic signals at least partially within the ultrasonic range, and the second of the devices includes an acoustic receiver configured to receive acoustic signals at least partially in the ultrasonic range. The transmitted ultrasonic signal has predetermined characteristics and said receiver being configured to recognize said characteristics and, at the receipt of said ultrasonic signal at the second device initiating a wireless communication using said communication protocol.