Sampling Frequency Adjustment for Anti-Aliasing Interference Suppression
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Solution Overview
Problem
Existing sampling processes face challenges in suppressing high-frequency interference signals without the use of anti-aliasing filters, which require additional development and space, and can cause undesired attenuation of useful signals.
Innovation Solution
A method that dynamically adjusts the sampling frequency by increasing or decreasing it in a controlled manner when an interference amplitude is detected within the base band, allowing high-frequency interference to be shifted outside the base band, thus eliminating the need for anti-aliasing filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-aliasing filter is used to filter out high-frequency interference signals before sampling, then interference suppression is improved, but device complexity and surface area increase
Solution Approach 1:
The patent changes the sampling frequency parameter dynamically to suppress interference. Instead of using a fixed sampling frequency with an anti-aliasing filter, the system adjusts the sampling frequency based on detected interference conditions, thereby eliminating the need for complex filtering hardware while achieving interference suppression through parameter adaptation.
Solution Approach 2:
The patent introduces dynamic adjustment of the sampling frequency based on interference detection. The sampling process transitions from a static, fixed-frequency operation to a dynamic process where the frequency is modified in response to detected interference conditions, eliminating the need for static anti-aliasing filters.
2Measurement precision
If an anti-aliasing filter is used to prevent high-frequency interference from being convoluted into the base band, then measurement precision is improved, but manufacturing cost and surface area increase
Solution Approach 1:
The patent achieves signal accuracy by dynamically changing the sampling frequency parameter rather than using complex anti-aliasing filters. This approach maintains measurement precision while simplifying the manufacturing process, as frequency adjustment can be implemented through software or simple control logic rather than complex filter hardware.
Solution Approach 2:
The patent replaces the mechanical/electrical anti-aliasing filter system with a digital/control-based frequency adjustment mechanism. Instead of using physical filter components that require complex manufacturing and assembly, the system uses controllable frequency modification to achieve the same interference suppression effect with simpler manufacturing.
3Object-affected harmful factors
If the sampling frequency is modified to shift interference outside the base band, then interference suppression is improved, but signal integrity may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the sampling frequency is adjusted based on detected interference conditions. The system continuously monitors for interference and modifies the sampling frequency accordingly, then verifies that the adjustment successfully suppresses interference while maintaining signal integrity. This closed-loop approach ensures that frequency modifications are made only when necessary and are validated to preserve signal quality.
Solution Approach 2:
The patent uses dynamic frequency adjustment to achieve interference suppression while preserving signal integrity. By adapting the sampling frequency in response to actual interference conditions rather than using a fixed high frequency, the system maintains optimal signal quality for the current operating conditions while eliminating interference.
Data Source
AI summary
A method for interference suppression of a sampling process includes sampling an analog signal with a sampling frequency f, and determining whether an interference amplitude is present. The method provides that if an interference amplitude is present, the sampling frequency f is increased or decreased, and the method begins again with the sampling of the analog signal with the increased or decreased sampling frequency. In addition, a device is described for carrying out the method.