Signal Processing Apparatus for Abrupt Change Detection
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Solution Overview
Problem
Existing signal processing techniques fail to effectively detect abrupt changes in signals, with methods detecting frequency changes or impulsive noise being inadequate in robustness.
Innovation Solution
A signal processing apparatus and method that converts input signals into phase and amplitude components in the frequency domain, calculates linearity of the phase component, and determines the presence of abrupt changes based on this linearity, enhancing the detection of impulsive sounds and noise suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing signal processing techniques (phase continuity evaluation, amplitude smoothing) are used, then signal processing is performed, but abrupt changes in the input signal cannot be detected
Solution Approach 1:
The patent segments the signal analysis by separating phase component analysis from amplitude component analysis. The linearity calculator specifically evaluates the linearity of phase components in the frequency domain, while amplitude smoothing handles amplitude variations. This segmentation allows the system to detect abrupt changes through phase linearity without being affected by amplitude fluctuations, resolving the contradiction between detection accuracy and robustness.
Solution Approach 2:
The patent transitions from time-domain analysis to frequency-domain analysis by evaluating phase linearity across frequency components. The linearity calculator computes phase linearity for multiple frequency components, and the abrupt change determiner integrates this frequency-domain information to detect abrupt changes. This dimensional change from time to frequency domain enables effective detection of abrupt changes that are invisible in time-domain amplitude analysis.
2Measurement precision
If amplitude-based impulsive sound detection is used, then impulsive sounds can be detected, but robustness is poor
Solution Approach 1:
The patent introduces phase linearity as an intermediary metric to detect abrupt changes. Instead of directly analyzing amplitude variations which are sensitive to signal conditions, the system uses phase linearity evaluation as an intermediate step. The linearity calculator computes phase linearity, which serves as a robust intermediary indicator that reflects abrupt changes without being affected by amplitude variations, thereby improving robustness while maintaining detection accuracy.
3Measurement precision
If frequency change detection by phase fluctuation measurement is used, then abrupt frequency changes can be detected, but general abrupt changes in signals cannot be detected
Solution Approach 1:
The patent creates a universal detection mechanism by evaluating phase linearity across all frequency components. The linearity calculator computes phase linearity for multiple frequency components, and the abrupt change determiner integrates this information to detect various types of abrupt changes including frequency changes, amplitude changes, and impulsive sounds. This multi-functional approach enables the system to detect different types of abrupt changes using a single unified method, improving versatility while maintaining accuracy for frequency changes.
Data Source
AI summary
Disclosed is a signal processing apparatus that processes an input signal to accurately detect an abrupt change in the input signal in accordance with the degree of linear change of a phase component in a frequency domain. The signal processing apparatus includes a converter that converts the input signal into the phase component and an amplitude component in the frequency domain, a linearity calculator that calculates the linearity of the phase component in the frequency domain, and a determiner that determines presence of the abrupt change in the input signal based on the linearity calculated by the linearity calculator.