Signal Correction via Digital Transfer Function
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Solution Overview
Problem
Existing signal measurement technologies face interference issues due to crosstalk and noise, leading to reduced measurement quality, and existing methods to mitigate these issues are either ineffective or costly.
Innovation Solution
A signal correction method that involves processing digital representations of signals through a system with two measurement inputs, determining the transfer function of interference, and using it to correct the measured signal by convolving the interference signal, allowing for precise post-processing elimination of interference without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding is provided for the measurement line to prevent crosstalk, then interference is reduced, but costs increase due to additional hardware
Solution Approach 1:
The patent replaces the mechanical/shielding approach with a digital signal processing approach. Instead of using physical shielding hardware to prevent interference, the system captures the interference signal digitally and removes it through post-processing operations including Fourier transformation and spectral subtraction, thereby eliminating the need for additional shielding hardware while maintaining measurement quality
Solution Approach 2:
The patent captures a copy of the interference signal through a separate measurement path and uses this copy to subtract the interference from the main measurement signal. By creating and processing a digital representation of the interference, the system can remove it from the measurement without requiring physical isolation or shielding
2Productivity
If real differential probes are used to measure signals, then measurement can be performed, but fast changing voltages with large amplitudes cannot be completely compensated
Solution Approach 1:
The patent performs preliminary characterization of the measurement system's transfer function before actual measurements. By measuring the system response to known test signals and determining the transfer function in advance, the system can later apply inverse filtering to correct measurements, thereby achieving accurate compensation for fast changing voltages that differential probes cannot handle in real-time
Solution Approach 2:
The patent implements a feedback mechanism where the measured signal is processed through the determined transfer function to calculate the expected interference, which is then subtracted from the original measurement. This feedback loop enables continuous correction of measurement errors caused by incomplete differential probe compensation
Data Source
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Figure 5a~5b
AI summary
A signal correction method for correcting a measured signal has the following steps: a) processing a digital representation of a first signal (S1) at a first measurement input (26), b) processing a digital representation of a second signal (S2) at a second measurement input (28) corresponding to the first signal (S1) convoluted with a transfer function (H), and c) determining the transfer function (H) for correcting the measured signal. Further, a use of the method, a system (24) for correcting a measured signal, and an oscilloscope (18) are provided.