Smart Speaker Isolation Assembly Using Nested Acoustic and Faraday Shielding
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Solution Overview
Problem
Smart speakers are vulnerable to unauthorized listening due to ambient acoustic noise and wireless signal interception, and modern microphone switches do not reliably turn off the microphone, leading to potential eavesdropping and data transmission issues.
Innovation Solution
The use of sound-absorbing materials and electromagnetic shielding to isolate the microphone ports and wireless communication of smart speakers, including weighted blankets, sound-reducing coatings, and Faraday shields to block ambient noise and wireless signals, ensuring secure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound-absorbing materials are placed over microphone ports to block ambient noise, then acoustic isolation is improved, but device complexity increases
Solution Approach 1:
The isolation assembly integrates multiple functional layers within a single cover structure. The sound-absorbing material is positioned between the outer cover and the microphone array, creating a nested configuration where the sound-absorbing layer is embedded within the cover assembly rather than being a separate component.
Solution Approach 2:
The patent employs a flexible cover structure that can conform to the device surface while incorporating sound-absorbing material. The cover acts as a thin film or shell that integrates acoustic isolation functionality without requiring rigid or complex structural elements.
2Object-affected harmful factors
If electromagnetic shielding is added to block wireless signals, then signal isolation is improved, but device complexity increases
Solution Approach 1:
The patent combines acoustic isolation and electromagnetic shielding functions into a single integrated cover assembly. The sound-absorbing material and electromagnetic shielding layer are merged into one structure that simultaneously addresses both types of interference without requiring separate components.
Solution Approach 2:
The electromagnetic shielding layer is positioned within the cover assembly, nested between the outer cover and the microphone array, similar to the sound-absorbing material. This nested configuration allows multiple isolation functions to be stacked within the same structural envelope.
3Object-affected harmful factors
If a weighted cover is used to apply pressure for sealing, then acoustic seal is improved, but ease of operation deteriorates
Solution Approach 1:
The patent incorporates weights within the cover assembly that apply downward pressure on the sound-absorbing material and seal against the device surface. These weights counteract the natural tendency of the flexible cover to lift or deform, maintaining consistent acoustic sealing without requiring external fastening mechanisms.
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
Effectively prevents unauthorized listening and data transmission by minimizing ambient noise reception and wireless signal interference, providing secure operation of smart speakers.
Implementation Method 1
a sound absorbing member that is placed over the microphone ports of the device. This sound reducing member comprises a material that is not a good transmitter of sound.
Implementation Method 2
In some embodiments, this electronically conductive shield is adapted and configured to shield the smart speaker from wireless signals in the range of about two gigahertz to about five gigahertz (for current Wi-Fi), or any other frequency band of interest.
Data Source
AI summary
Methods and apparatus for acoustically and electronically isolating a smart speaker to prevent unauthorized persons from using the smart speaker microphones to eavesdrop and intrude into a personal space.