Vehicle Voice Assistant Activation Using CSI Motion Markers
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Solution Overview
Problem
Existing voice assistant activation systems in vehicles face performance issues due to obstruction by environmental objects, high resource usage, and reduced effectiveness in noisy environments, necessitating a more reliable and efficient method for intentional and authorized voice command activation.
Innovation Solution
A system utilizing a microphone, first and second wireless modules, and a controller to transmit and receive training signals, determine channel state information (CSI) deviations, and identify motion markers to activate the voice assistant based on motion detection, incorporating low-fidelity and high-fidelity markers, and multifactor authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar-based sensors are used to detect motion, then motion detection capability is improved, but performance is reduced due to obstruction by objects in the environment
Solution Approach 1:
The wireless communication system serves dual purposes: enabling normal data transmission and detecting motion through channel state information analysis. The same wireless modules used for communication are repurposed to detect motion markers, eliminating the need for dedicated radar sensors that are susceptible to obstruction.
Solution Approach 2:
The patent replaces physical radar-based motion detection with a signal-based detection method using wireless communication channel state information. This substitution eliminates mechanical and physical obstruction issues by using electromagnetic signal propagation characteristics to detect motion through changes in the wireless channel.
2Measurement precision
If camera-based systems are used for motion detection, then presence detection is improved, but resource usage increases due to continuous recording and streaming
Solution Approach 1:
Instead of continuous camera recording, the system uses periodic wireless signal transmission with motion detection based on channel state information analysis. Motion markers are detected by comparing channel state information across different time periods, enabling presence detection without continuous resource consumption.
Solution Approach 2:
The wireless communication system self-monitors its own channel state information to detect motion, eliminating the need for separate dedicated detection systems. The same communication infrastructure serves both data transmission and motion detection functions, reducing overall resource requirements.
3Reliability
If touch-based motion detection mechanisms are used, then activation reliability is improved, but ease of operation is reduced as individuals must touch the vehicle
Solution Approach 1:
The patent replaces physical touch-based detection with wireless signal-based motion detection. Changes in the wireless channel state information caused by body movement near the vehicle trigger voice assistant activation, allowing hands-free operation while maintaining reliable detection through motion marker analysis.
4Ease of operation
If sound-based motion detection mechanisms are used, then ease of operation is improved, but performance is reduced in environments with loud and varying sound levels
Solution Approach 1:
The patent replaces acoustic-based detection with electromagnetic signal-based detection using wireless channel state information. This substitution enables hands-free operation like sound-based systems while avoiding their susceptibility to environmental noise, as wireless signal propagation characteristics are not affected by acoustic interference.
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 the reliability and efficiency of voice assistant activation by accurately distinguishing intentional and authorized voice commands, reducing false activations, and ensuring secure operation in various environmental conditions.
Implementation Method 1
transmitting a plurality of original training signals on a plurality of subcarriers using a first wireless transceiver system... receiving a plurality of propagated training signals using a second wireless transceiver system
Data Source
AI summary
A system for activating a voice assistant of a vehicle includes a microphone, a first wireless module, a second wireless module, and a controller in electrical communication with the microphone, the first wireless module, and the second wireless module. The controller is programmed to transmit a plurality of original training signals on a plurality of subcarriers using the first wireless module. The controller is further programmed to receive a plurality of propagated training signals using the second wireless module. The controller is further programmed to determine a deviation between the plurality of original training signals and the plurality of propagated training signals. The controller is further programmed to identify a motion marker based at least in part on the deviation. The controller is further programmed to activate the voice assistant of the vehicle to receive a voice command using the microphone based at least in part on the motion marker.