Digital Tracking Filter Frequency Pre-warping
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Solution Overview
Problem
Existing electronic systems face inefficiencies in detecting and tracking operating frequencies, especially in systems with high-frequency components, as static filtering techniques fail to accurately identify normal or abnormal frequency ranges, leading to potential component failures and inefficient operation.
Innovation Solution
A digital tracking filter method that periodically samples signal values, pre-warping the frequency of interest to prevent aliasing and distortion, allowing for accurate estimation of operating frequencies using a processor-based system with an input integrator circuit, frequency pre-warping circuit, and tracking filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static filtering techniques are used to detect operating frequencies, then the system structure is simple, but the measurement precision deteriorates when frequencies vary within a wide range
Solution Approach 1:
The patent implements a dynamic tracking filter where the center frequency is continuously updated based on the estimated operating frequency. The filter transitions from a static configuration to a dynamic one that adapts to frequency variations, allowing accurate tracking of frequencies that vary within a wide range while maintaining reasonable system complexity.
Solution Approach 2:
The system uses feedback from the estimated frequency to adjust the filter's center frequency. The estimated frequency from the tracking algorithm feeds back to update the filter parameters, creating a closed-loop system that improves measurement precision through continuous adaptation.
2Measurement precision
If the sampling rate is increased to accurately capture high-frequency components, then the measurement precision improves, but the loss of time increases due to more frequent sampling
Solution Approach 1:
The patent changes the sampling strategy by using a fixed, moderate sampling rate combined with a tracking filter algorithm. Instead of increasing the sampling rate to capture all frequency details, the system uses parameter changes in the filter (center frequency and bandwidth updates) to achieve accurate high-frequency detection without the time penalty of ultra-high sampling rates.
3Adaptability or versatility
If a wide bandwidth filter is used to capture varying frequencies, then the adaptability improves, but the measurement precision deteriorates due to frequency smearing
Solution Approach 1:
The patent resolves this contradiction by making the filter bandwidth dynamic. The bandwidth is adjusted based on the estimated frequency and its rate of change, allowing the filter to be wide enough to capture frequency variations while remaining narrow enough to maintain precision. This dynamic adjustment prevents frequency smearing while adapting to varying operating conditions.
Data Source
AI summary
Methods and systems for tracking an electronic signal corresponding to an operating frequency of an electronic component are provided. A method may include sampling the signal to determine previous and current time samples of the signal. A frequency of interest in the signal may also be pre-warped to decrease adverse warping effects resulting from processing signals having relatively higher operating frequencies. The previous and current time samples of the signals, along with the pre-warped frequency of interest, may be input into a digital tracking filter. The digital tracking filter may be configured to execute one or more algorithms on the previous and current time samples and the pre-warped frequency of interest to estimate a current operating frequency.