Ring Suppression Filter for Oscilloscope Signal Artifact Identification
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Solution Overview
Problem
Measurement instruments like oscilloscopes often introduce artifacts such as ringing and overshoot due to bandwidth limitations, making it difficult for users to determine if these effects are part of the input signal or instrument-related.
Innovation Solution
A ring suppression filter and a flat magnitude filter are used in conjunction with the oscilloscope to provide a non-ringing output when processing an impulse signal, ensuring that the system response is linear in phase and substantially constant in magnitude, allowing users to differentiate between signal artifacts and instrument limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receiver bandwidth is increased to capture higher frequency components, then the measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The invention segments the frequency spectrum handling by using multiple receivers with different bandwidth characteristics. Each receiver captures a specific frequency range, and the results are combined to reconstruct the full spectrum, avoiding the need for a single high-bandwidth receiver
Solution Approach 2:
The invention introduces an intermediary signal processing system that processes the output from multiple receivers. This intermediary system includes filters and combiners that reconstruct the full frequency spectrum from partial measurements, acting as a mediator between limited receiver bandwidths and the requirement for complete spectral information
2Device complexity
If the receiver bandwidth is limited to reduce device complexity, then the device complexity is reduced, but ringing and overshoot artifacts are introduced that degrade measurement precision
Solution Approach 1:
The invention converts the harmful effect of bandwidth limitation (ringing and overshoot) into a beneficial diagnostic tool. By deliberately introducing controlled ringing through impulse signals and measuring its characteristics, the system identifies the receiver's impulse response and uses this information to deconvolve and correct the measured signals, eliminating the artifacts
Solution Approach 2:
The invention changes the parameter being measured from the direct signal amplitude to the impulse response characteristics. By measuring how the receiver responds to an impulse input and using this transfer function to correct subsequent measurements, the system transforms the bandwidth limitation problem into a solvable mathematical relationship
3Productivity
If impulse signals are used to measure system response, then the measurement speed is improved, but ringing artifacts are introduced that complicate signal interpretation
Solution Approach 1:
The invention implements feedback by measuring the actual impulse response of the receiver system and using this measured response to correct subsequent measurements. The system continuously characterizes its own behavior and uses this self-knowledge to compensate for its limitations, eliminating ringing artifacts from the final results
Data Source
AI summary
An apparatus and method for determining if ringing in an output signal from a receiver that processes an input signal is the result of a bandwidth limitation in the receiver that processes an input signal rather than ringing in the input signal is disclosed. The apparatus includes the receiver and a ring suppression filter. The ring suppression filter receives the receiver output signal and generates a ring suppressed output signal therefrom. The receiver and the ring suppression filter provide a first aggregate system response such that the ring suppressed output signal does not include ringing introduced by the receiver. The first aggregate system response is linear in phase.