Biosignal Frequency Conversion for Narrow-Band Amplifier Processing
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Solution Overview
Problem
Existing biosignal processing technologies face challenges in amplifying signals with frequency components outside the amplifiable bandwidth of instrumentation amplifiers, leading to inefficiencies and increased power consumption due to the need for wider frequency bandwidths.
Innovation Solution
The method involves modulating biosignals to bring their frequency components within the amplifiable range using XNOR logic operations and phase-shifting, allowing for amplification with a narrower frequency bandwidth, thereby reducing power usage and design area requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the amplifier frequency bandwidth is widened to amplify biosignals with frequency components outside the amplifiable range, then the signal amplification capability is improved, but the power consumption increases
Solution Approach 1:
The signal processing is divided into two stages: first, frequency conversion transforms the biosignal frequency components into a range suitable for the amplifier; second, the amplifier amplifies the converted signal. This segmentation allows the amplifier to operate within its optimal bandwidth while still processing signals that originally had frequency components outside its amplifiable range.
Solution Approach 2:
A frequency conversion unit acts as an intermediary between the biosignal source and the amplifier. This intermediary component converts the frequency of the input signal to match the amplifier's amplifiable bandwidth, enabling the amplifier to efficiently amplify signals without requiring an extended bandwidth.
2Adaptability or versatility
If the amplifier frequency bandwidth is widened to accommodate various biosignal frequencies, then the signal processing versatility is improved, but the design area increases
Solution Approach 1:
The system is segmented into a frequency conversion unit and an amplification unit with narrow bandwidth. By dividing the signal processing function, the amplification unit can be designed with a compact, narrow bandwidth while the frequency conversion unit handles the frequency adaptation, reducing the overall design area.
Solution Approach 2:
The frequency conversion unit serves as an intermediary that adapts the biosignal frequency to match the narrow bandwidth amplifier. This intermediary approach allows the use of a compact amplifier design without sacrificing the ability to process various biosignal frequencies.
3Measurement precision
If the amplifier frequency bandwidth is increased to amplify high-frequency biosignals, then the frequency range coverage is improved, but the power consumption increases
Solution Approach 1:
The frequency parameter of the biosignal is changed through frequency conversion before amplification. By transforming the high-frequency signal into a lower frequency within the amplifier's narrow bandwidth, the system achieves wide frequency range coverage while the amplifier consumes power only for its narrow operational band.
Solution Approach 2:
The frequency handling function is segmented from the amplification function. The frequency conversion unit handles the frequency transformation, while the amplifier focuses solely on amplifying signals within its narrow bandwidth, thereby reducing power consumption while maintaining wide frequency range coverage.
Data Source
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AI summary
An apparatus of processing a signal or a biosignal, and a method of processing a signal or a biosignal are provided. The method of processing signal involves receiving a first reference signal having a frequency component of a measurement signal to be applied to a subject, receiving a second reference signal having a frequency component within a frequency bandwidth of an amplifier, and converting a first signal measured from the subject to a second signal within the frequency bandwidth of the amplifier, based on the first reference signal and the second reference signal.