Start Signal Train Correction After DC Suppression
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Solution Overview
Problem
Existing methods for generating DC-suppressed signal trains from start signal trains with unipolarly deflected periodic pulses introduce systematic errors by inadvertently eliminating the DC component of the first component, leading to reduced peak values and inaccurate signal evaluation.
Innovation Solution
A method where the DC component of the first component is determined from the DC-suppressed signal train as a correction value, and this value is added back with the correct sign to the DC-suppressed signal train, using a polarity-dependent function and components like rectifiers and comparators, to recover the original signal train.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If DC signal suppression is applied to remove the second component (DC signals and noise), then the noise and offset voltages are eliminated, but the DC component of the first component (periodic pulses) is also inadvertently eliminated, causing systematic errors and reduced peak values
Solution Approach 1:
The patent segments the signal processing into two distinct paths: a DC-suppressed signal path for noise removal and a separate correction value determination path. By splitting the processing and applying different operations to different components, the method selectively removes DC noise while preserving the essential DC information needed for accurate peak value representation.
Solution Approach 2:
The patent introduces a correction value as an intermediary element that mediates between the DC-suppressed signal and the original signal characteristics. This correction value, determined from pause times and polarity-dependent relationships, serves as a bridge to recover the DC component information that was removed during suppression, thereby eliminating systematic errors without reintroducing noise.
2Reliability
If DC signal suppression is applied through filtering or AC coupling, then the DC offset is removed, but the first component (periodic pulses) exhibits systematic errors with lower peak values relative to the reference
Solution Approach 1:
The patent implements a feedback mechanism where the correction value is determined from the DC-suppressed signal itself during pause times, and then fed back to correct the systematic errors. The polarity-dependent function analyzes the corrected signal characteristics and adjusts the correction value accordingly, creating a closed-loop system that continuously refines the peak value accuracy while maintaining DC offset elimination.
Solution Approach 2:
The patent changes the operational parameters of the signal processing by introducing polarity-dependent functions that operate differently during pulse times versus pause times. By modifying the processing parameters based on the signal state (pulse vs. pause) and polarity, the method dynamically adjusts the correction applied, thereby recovering peak values without reintroducing DC offset.
3Measurement precision
If a polarity-dependent function is used to determine correction values from components with opposite polarity, then the DC component can be accurately recovered, but the device complexity increases with additional circuit components
Solution Approach 1:
The patent designs the correction value determination unit to perform multiple functions: it determines correction values during pause times, applies polarity-dependent analysis, and automatically adjusts corrections based on signal characteristics. By making this single unit multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while maintaining high DC component recovery accuracy.
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
This approach corrects systematic errors in the signal train, ensuring peak values are preserved and the signal train accurately represents the original first component, enhancing measurement accuracy.
Implementation Method 1
The correction value is determined from a component of the DC-suppressed signal train which has a polarity opposite to the unipolar deflection with respect to the reference
Implementation Method 2
a polarity-dependent function with respect to the reference, and the correction value is determined from a component of the DC-suppressed signal train which has a polarity opposite to the unipolar deflection with respect to the reference
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
A method for processing a start signal train (E) is provided, which comprises a first component (42) with periodic pulses (48), wherein the pulses (48) are unipolar relative to a reference (34), and may comprise a second component (44) which is a noise component with DC signals, in which a DC-suppressed signal train (F) is generated from the start signal train (E), characterized in that a DC component of the first component (42) of the start signal train (E) is determined as a correction value (K) from the DC-suppressed signal train (F) and this correction value (K) is added to the DC-suppressed signal train (F) with the correct sign, resulting in a corrected result signal train (A).