Perforated Light-Blocking Barrier for Voice Device Microphone Protection
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Solution Overview
Problem
Voice-controllable systems such as Amazon Echo and Google Home are vulnerable to laser-based audio injection attacks, where modulated laser beams can send inaudible and invisible commands to microphones, exploiting their sensitivity to light in addition to sound.
Innovation Solution
A physical device with multiple layers of integrated light-blocking material is placed over the microphones, featuring openings that allow sound waves to pass through while blocking modulated light, including visible, ultraviolet, and infrared light, thereby creating a barrier between the microphone and potential laser attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a physical barrier is placed over the microphone to block light, then the device is protected from laser attacks, but sound transmission may be blocked
Solution Approach 1:
The patent employs a porous or perforated physical barrier structure that allows sound waves to pass through while blocking light. The openings in the barrier are designed with dimensions that permit acoustic wave transmission but prevent light penetration, thereby resolving the contradiction between light blocking and sound transmission.
Solution Approach 2:
The patent uses composite material structures combining light-blocking properties with acoustic permeability. The multi-layered or composite design allows the barrier to simultaneously achieve optical opacity and acoustic transparency, protecting against laser attacks while maintaining normal voice input functionality.
2Object-affected harmful factors
If multiple layers of light-blocking material are used, then light blocking effectiveness increases, but device complexity increases
Solution Approach 1:
The patent divides the light-blocking function into multiple discrete layers or sections. Each layer contributes to the overall light blocking effectiveness, and the segmented structure allows for modular assembly and maintenance while achieving the desired optical protection level.
Solution Approach 2:
The patent addresses light blocking by adding dimensional complexity through multiple layers arranged in specific spatial configurations. Rather than using a single thick barrier, the solution distributes the blocking function across multiple thinner layers positioned at different depths, achieving effective light blocking while managing structural complexity.
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 malicious laser light from injecting audio commands into voice-controllable devices, ensuring the microphone only receives genuine sound-based inputs while maintaining normal operation with minimal impact on listening capability.
Implementation Method 1
The apparatus may be configured to block the passage of light, but to allow the passage of sound. The at least one light-blocking portion may comprise at least one layer of light-blocking material.
Data Source
AI summary
Embodiments may provide techniques that protect voice-controllable devices and systems such that the microphone can be shielded from attacking modulated laser beams. Embodiments may provide a physical device that may include two or more layers of integrated material that sits on top of the microphones of the voice-controllable devices and/or systems. The device may act as a physical barrier against the injected malicious laser beams while allowing sound waves reach the microphone for normal operation. For example, in an embodiment, an apparatus may comprise a first layer including at least one opening and a second layer including at least one opening, wherein the at least one opening in the first layer and the at least one opening in the second layer are arranged so as to block the passage of light, but to allow the passage of sound.