Signal Processing Device Sudden Change Detection
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Solution Overview
Problem
Existing techniques for detecting sudden changes in signals are inaccurate when the ratio of sudden change signals to non-sudden change signals is low, as they fail to effectively utilize the gradient of phase component signals across frequencies.
Innovation Solution
A signal processing device and method that cuts out determination target signals and overlapping signals, converts them into phase component signals, calculates phase gradients, and computes a score based on these gradients to determine the presence of sudden changes, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first gradient and second gradient are calculated only from the signal in the section where sudden change detection is desired, then the calculation is simple and fast, but the detection accuracy deteriorates when the ratio of sudden change signal to non-sudden change signal is small
Solution Approach 1:
The patent applies preliminary action by calculating gradients from overlap signals (adjacent sections) before making the detection decision. These pre-calculated gradients from overlapping regions are stored and reused, allowing the system to accumulate sufficient gradient information from multiple sections without recalculating everything from scratch, thus maintaining both speed and accuracy
Solution Approach 2:
The patent merges gradient information from multiple sources: the determination target signal section and multiple overlap signal sections. By combining gradients from these overlapping regions, the system accumulates sufficient gradient data even when the sudden change signal ratio is low, improving detection accuracy while avoiding redundant calculations through strategic reuse of overlap regions
2Measurement precision
If gradient information from multiple overlapping sections is utilized, then detection accuracy improves, but the calculation complexity increases
Solution Approach 1:
The patent performs preliminary calculation of gradients in overlap sections and stores them for future use. When processing determination target signals, these pre-calculated gradients are retrieved and reused, avoiding redundant calculations and reducing overall computational complexity while still utilizing information from multiple overlapping sections
Solution Approach 2:
The patent calculates gradients for overlap sections that extend beyond the immediate determination target section. This excessive action of calculating gradients in adjacent overlapping regions provides redundant information that improves detection accuracy, while the systematic reuse of these pre-calculated values prevents the complexity from becoming unmanageable
Data Source
AI summary
A signal processing device according to an aspect of the present disclosure comprises: cutout means that cuts out a target signal in a predetermined section, and an overlap signal in a section not matching the predetermined section but overlapping with at least part of the predetermined section from an input signal; conversion means that converts the target signal and the overlap signal into a phase component signal in a frequency domain with respect to each frequency; gradient calculation means that, based on the phase component signal, calculates, at each frequency, a phase gradient that is the gradient of the phase component at the frequency; score calculation means that calculates a score relating to the sudden change characteristic of the input signal according to the phase gradients; and determination means that, based on the score, determines the presence or absence of a sudden change in the target signal.