Correlator Digital Filter Signal Extraction
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Solution Overview
Problem
Analog signals often include noise and distortions, making it difficult to distinguish the underlying physical characteristics of a system, such as voltage or current, from the measured signals in electronic circuits.
Innovation Solution
A correlator digital filter is used to extract target signals by correlating input signals with reference signals, separating sinusoidal portions from noise and other distortions, and calculating power consumption based on extracted voltage and current signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog signals are used to measure physical characteristics, then the system can obtain continuous measurement data, but the measured signal includes noise and distortions that make it difficult to distinguish the underlying physical characteristic
Solution Approach 1:
The patent extracts the target signal from the noisy input signal by correlating the input signal with a reference signal. The correlator digital filter separates the desired signal component (voltage or current) from noise and distortions by computing the correlation between the input signal and reference signal, effectively extracting only the correlated portion while rejecting uncorrelated noise.
Solution Approach 2:
The patent introduces a reference signal as an intermediary to facilitate the extraction of the target signal. The reference signal serves as a mediator that correlates with the target signal component in the input signal, allowing the system to identify and extract the desired physical characteristic while filtering out noise through the correlation process.
2Measurement precision
If traditional filtering methods are used to remove noise, then noise reduction can be achieved, but the underlying signal may also be distorted or lost
Solution Approach 1:
Instead of using traditional filtering that may distort the signal, the patent extracts the target signal through correlation with a reference signal. This extraction method selectively removes noise while preserving the signal characteristics that correlate with the reference, maintaining signal integrity while achieving noise reduction.
Solution Approach 2:
The patent changes the approach from frequency-domain filtering to correlation-based extraction in the time domain. By using correlation as the processing parameter, the system can distinguish signal from noise based on temporal relationships with the reference signal rather than frequency characteristics, preserving signal integrity while reducing noise.
Data Source
AI summary
A control system for controlling operation of an electric appliance is provided. The control system includes a correlator digital filter configured to receive input signals including at least one target signal associated with operation of the electric appliance and extract the target signal from the input signal. The control system also includes a controller operatively coupled with the correlator digital filter and the electric appliance, where the controller is configured to receive the extracted target signal from the correlator digital filter.