Impedance Sensing Human Activity Detection
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Solution Overview
Problem
Current human-computer interaction technologies lack a sensor that can effectively measure a variety of human actions and activities, such as proximity, touch, deformation, and manipulation, to accurately sense human presence and intention for use in user interfaces.
Innovation Solution
A system and method utilizing impedance measurement by generating a frequency-swept signal to detect changes in impedance parameters when an external body interacts with an object, allowing for the identification of interaction characteristics through changes in resonant frequency and other impedance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional sensor technology is used to detect human activity, then specific physical phenomena can be measured (resistance, light intensity, magnetic field), but the system lacks versatility to measure a variety of human actions and activities
Solution Approach 1:
The patent applies universality by using a single impedance sensor to perform multiple sensing functions. The sensor can detect proximity, touch, deformation, and manipulation by measuring changes in impedance at different frequencies, eliminating the need for multiple specialized sensors while maintaining measurement versatility across different human actions and activities.
Solution Approach 2:
The patent employs parameter changes by sweeping through a range of frequencies to measure impedance characteristics. By analyzing impedance magnitude and phase across different frequencies, the system can distinguish between various types of interactions (proximity vs. touch vs. deformation) using a single sensor, thereby achieving multi-functionality without increasing device complexity.
2Measurement precision
If multiple specialized sensors are used to detect different human activities, then measurement precision for specific actions improves, but device complexity increases
Solution Approach 1:
The patent uses a single impedance sensor to replace multiple specialized sensors. By analyzing impedance characteristics across a frequency spectrum, the sensor can precisely detect different types of interactions (proximity, touch, deformation, manipulation) that would traditionally require separate sensors, thereby maintaining measurement precision while reducing device complexity.
Solution Approach 2:
The patent adds the frequency dimension to the measurement process. Instead of using multiple sensors in the spatial domain, the system uses a single sensor and analyzes impedance across different frequencies, effectively moving the differentiation of interaction types from the spatial domain to the frequency domain, thus reducing the number of physical sensors needed.
3Adaptability or versatility
If impedance measurement is used to sense human interaction, then versatility in detecting different actions is improved, but measurement precision for specific parameters may be affected
Solution Approach 1:
The patent performs preliminary action by sweeping through a range of frequencies before making a measurement decision. The system characterizes the impedance response across the frequency spectrum first, then uses this comprehensive data to accurately identify the type of interaction, ensuring both versatility and precision in detection.
Solution Approach 2:
The patent employs feedback by continuously monitoring impedance changes across frequencies and using this information to identify interaction patterns. The system analyzes the relationship between frequency and impedance magnitude/phase, using this feedback to distinguish between different types of human actions with high precision while maintaining broad detection capability.
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
Enables accurate sensing of human interactions by tracking changes in resonant frequency and impedance parameters, enabling the development of advanced user interfaces that can recognize and respond to human actions and intentions.
Implementation Method 1
a signal generator producing a frequency-swept signal in an object
Implementation Method 2
an impedance measurement component coupled to the object and configured to identify a change in an impedance parameter of the frequency-swept signal
Data Source
AI summary
A system for sensing human activity by monitoring impedance includes a signal generator for generating an alternating current (AC) signal, the AC signal applied to an object, a reactance altering element coupled to the AC signal, an envelope generator for converting a returned AC signal to a time-varying direct current (DC) signal, and an analog-to-digital converter for determining a defined impedance parameter of the time-varying DC signal, where the defined impedance parameter defines an electromagnetic resonant attribute of the object.