Signal Demodulation Circuit for Wearable Devices
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Solution Overview
Problem
In closed communication systems, conventional signal demodulation apparatuses require complex circuits due to their design for non-closed systems, leading to increased power consumption and circuit area, which is not suitable for applications with strict power and area requirements like wearable devices.
Innovation Solution
A signal demodulation apparatus and method utilizing an analog voltage comparator to convert modulated signals into digital signals and a sampling decider to sample and feature-judge these signals, simplifying the circuit structure and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional demodulation circuits are used in closed communication systems, then interference from other modulated signals can be prevented, but circuit complexity and power consumption increase
Solution Approach 1:
The patent extracts and removes unnecessary demodulation circuits from the closed communication system. Since closed systems have predetermined communication partners with known modulation modes, the complex universal demodulation circuits designed for open systems are eliminated, retaining only the essential sampling and decision-making components needed for the specific predetermined modulation mode.
Solution Approach 2:
The patent segments the demodulation function into minimal essential components: an analog-to-digital converter and a sampling decider. This segmentation removes redundant filtering and envelop detection circuits, keeping only the core functionality needed for demodulating the predetermined modulation mode in closed systems.
2Measurement precision
If conventional demodulation circuits are used in closed communication systems, then signal demodulation accuracy is maintained, but power consumption increases
Solution Approach 1:
The patent extracts and eliminates power-consuming components such as multiple filters and envelop detectors from the demodulation circuit. By removing these unnecessary components while retaining the essential sampling and decision-making functions, the circuit achieves acceptable demodulation accuracy with significantly reduced power consumption suitable for ultra-low power applications.
Solution Approach 2:
The patent applies partial action by implementing only the minimum necessary demodulation steps (sampling and decision-making) required for closed systems, rather than the complete demodulation process designed for open systems. This partial implementation maintains sufficient accuracy for predetermined communication scenarios while drastically reducing power consumption.
3Use of energy by stationary object
If simplified demodulation circuits are used, then power consumption and circuit area are reduced, but ability to handle multiple modulation modes is lost
Solution Approach 1:
The patent segments the communication system into closed and open system categories, applying different demodulation strategies to each. For closed systems with predetermined partners and known modulation modes, the simplified circuit is appropriate. This segmentation allows the system to achieve low power consumption where applicable while acknowledging that versatility is not required for closed systems.
Solution Approach 2:
The patent makes the demodulation approach dynamic by adapting the circuit complexity to the system type. Closed communication systems use the simplified demodulation circuit with predetermined modulation mode support, while open systems would use the more complex universal demodulation circuit. This dynamic adaptation allows optimal power consumption for each scenario.
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
The solution results in a simple circuit structure with low power consumption and small area requirements, making it suitable for applications with strict power and area constraints, such as wearable devices.
Implementation Method 1
an analog voltage comparator, configured to convert a received modulated signal into a digital signal
Data Source
AI summary
A signal demodulation apparatus and method for a closed communication system are provided. An analog voltage comparator is configured to convert a modulated signal and output the digital signal. The modulated signal is a 2ASK, 2FSK or 2PSK modulated signal. A sampling decider is configured to sample the digital signal to obtain a sampled digital signal. The sampling decider includes a high-frequency clock sampling circuit and a feature extracting and deciding circuit. The high-frequency clock sampling circuit is configured to sample the digital signal and to sample at least two points for a high level of any pulse of the digital signal. The feature extracting and deciding circuit is configured to extract a feature of the sampled digital signal to obtain an extracted feature of the sampled digital signal, and compare the extracted feature with features of known digital modulated signals to acquire a value represented by the digital signal.