Oscilloscope Trigger Signal Display for Low-Frequency Interference

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Solution Overview

Problem

The triggering function of digital oscilloscopes is unstable due to low-frequency interference, leading to inaccurate adjustment of the trigger level without intuitive observation of the actual trigger signal, as the low-frequency signal is suppressed, disrupting the correspondence between the trigger level setting and the actual trigger signal.

Innovation Solution

A signal processing apparatus and method that extracts a low-frequency component signal from the trigger signal, generates a trigger comparison signal based on this relationship, and displays a target signal on an interactive interface to establish a corresponding relationship between the trigger level and the actual trigger signal, allowing intuitive observation and accurate adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If low-frequency suppression mode is adopted to stabilize triggering, then triggering stability is improved, but the correspondence between trigger level setting and actual trigger signal is lost

Engineering Contradiction:

Improvetriggering stabilityVSAvoidcorrespondence between trigger level setting and actual trigger signal

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent segments the trigger signal processing into two independent paths: one path suppresses low-frequency components for stable triggering, while the other path preserves the original trigger signal for display. This segmentation allows both objectives to be achieved simultaneously without interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism (the second trigger signal generated from the original trigger signal without low-frequency suppression) that mediates between the suppressed trigger signal used for triggering and the original trigger signal needed for accurate level adjustment reference.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If low-frequency component is suppressed from trigger signal, then triggering stability is improved, but user cannot intuitively observe actual trigger signal for accurate adjustment

Engineering Contradiction:

Improvetriggering stabilityVSAvoidintuitive observation of actual trigger signal

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent divides the trigger signal into two functional segments: a suppressed version for reliable triggering and an original version for user observation and adjustment reference, allowing both stability and ease of operation to coexist.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a copy of the original trigger signal that preserves the low-frequency components, using this copy as a reference display for users during trigger level adjustment while the suppressed version handles actual triggering.

Inventive Principle:

Principle #26Copying

3Reliability

If digital low-pass filter is used to suppress low-frequency component, then triggering stability is improved, but setting accuracy of trigger level is reduced

Engineering Contradiction:

Improvetriggering stabilityVSAvoidsetting accuracy of trigger level

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent segments the signal processing function into two distinct pathways: one applying digital low-pass filter for stable triggering, and another preserving the original signal for accurate trigger level measurement and adjustment reference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary trigger comparison signal derived from the original trigger signal without filtering, which serves as a mediator to maintain the relationship between trigger level settings and actual signal characteristics during adjustment.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12493055B2Signal processing apparatus and method, and digital oscilloscope

Publication Date: 2025.12.09 RIGOL TECHNOLOGIES CO LTD

AI summary

A signal processing apparatus and method, and a digital oscilloscope are provided. The signal processing apparatus is configured to output one of two target signals according to a trigger signal and a trigger level. The signal processing apparatus includes a trigger comparison unit, a trigger display unit, and a controller. The trigger comparison unit is configured to extract a low-frequency component signal from the trigger signal. The controller is electrically connected to the trigger comparison unit and is configured to generate a trigger comparison signal according to a relationship between the low-frequency component signal and the trigger signal, and output a target signal obtained based on the trigger comparison signal according to a preset rule. The trigger display unit is electrically connected to the controller and is configured to receive and display the target signal on a target interactive interface.