Human Body Communication Receiver With Multi-Stage Noise Filtering
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Solution Overview
Problem
Human body communication technologies face challenges in efficiently receiving signals due to noise generated during signal transfer through the human body, requiring a high-performance receiver to effectively filter and amplify biosignals.
Innovation Solution
A receiver configuration that includes filter circuits and an amplifier to separate and attenuate noise frequencies from biosignal frequencies, using specific cutoff frequencies to distinguish and remove noise, thereby enhancing signal clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple amplifier is used to amplify biosignals, then the amplification process is simple, but noise generated during signal transfer through the human body cannot be effectively removed
Solution Approach 1:
The receiver is divided into multiple functional modules: a filter circuit with multiple filter elements (first, second, third filter elements) that segment different frequency ranges, and a separate amplification circuit. This segmentation allows noise removal and signal amplification to be performed independently and effectively.
Solution Approach 2:
The filter circuit acts as an intermediary between the noisy input signal and the amplification stage. It removes noise components at specific frequency ranges before the signal is amplified, preventing noise amplification and improving overall signal quality.
2Reliability
If noise removal filtering is applied to all frequency components, then noise is removed, but useful biosignal components may also be attenuated
Solution Approach 1:
Different filter elements are designed with different frequency characteristics tailored to specific noise sources. The first filter element targets power supply noise frequencies, the second targets switching noise frequencies, and the third passes biosignal frequencies. This localized filtering approach removes noise while preserving useful biosignal components.
Solution Approach 2:
The filter circuit selectively changes the attenuation parameter across different frequency ranges. By adjusting the cutoff frequencies and attenuation levels of individual filter elements, the system optimizes noise removal while minimizing biosignal loss.
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 proposed receiver effectively removes noise from the signal, allowing for accurate acquisition and amplification of biosignals, improving data transmission quality in human body communication systems.
Implementation Method 1
The first filter circuit may provide a first path for first frequency components below a first cutoff frequency of input frequency components, and may pass second frequency components except for the first frequency components of the input frequency components through a second path
Implementation Method 2
The amplifier may amplify the second frequency components that include the attenuated third frequency components
Data Source
AI summary
Provided is a receiver. The receiver according to the inventive concept includes a first filter circuit, a second filter circuit, and an amplifier. The first filter circuit provides a first path for first frequency components below first cutoff frequency of input frequency components and passes second frequency components except for the first frequency components of the input frequency components through second path. The second filter circuit attenuates third frequency components below a second cutoff frequency of the second frequency components. The amplifier amplifies the second frequency components including the attenuated third frequency components.