Sinusoidal Signal Sampling With Phase-Error Timing Control
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Solution Overview
Problem
Existing methods for sampling sinusoidal signals often require generating an excitation signal or using short, uniform sampling periods, which are inefficient and resource-intensive, especially when sampling at specific non-uniform phase angles.
Innovation Solution
A phase-based sampling method that allows sampling at desired phase angles without generating an excitation signal, using a control loop to determine the time delay between samples, enabling sampling at non-uniform intervals and reducing the need for oversampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed uniform sampling periods are used, then sampling simplicity is maintained, but sampling cannot be limited to specific phase angles without additional processing
Solution Approach 1:
The patent implements feedback by measuring the actual phase angle of the sinusoidal signal and using this information to dynamically adjust the sampling timing. The controller calculates the phase error between the actual and desired sampling phases, then modifies subsequent sampling intervals to correct this error, ensuring samples are taken at optimal phase angles for maximum signal-to-noise ratio.
Solution Approach 2:
The patent transitions from static fixed sampling periods to dynamic variable sampling periods. The sampling interval is continuously adjusted based on the measured phase angle and desired phase targets, allowing the system to adapt to signal variations and maintain optimal sampling timing without requiring complex preprocessing or oversampling.
2Measurement precision
If excitation signal generation is implemented to limit sampling to specific phase angles, then sampling precision is improved, but device complexity and resource requirements increase
Solution Approach 1:
The patent applies self-service by having the controller measure the phase angle of the incoming sinusoidal signal itself and use this self-determined information to control its own sampling timing. This eliminates the need for external excitation signals or complex synchronization mechanisms, as the system uses the signal's own characteristics to guide sampling.
Solution Approach 2:
The patent changes the sampling parameter (sampling interval) dynamically based on the measured phase angle parameter. Instead of using a fixed sampling period, the system adjusts the sampling interval to ensure samples are acquired at the desired phase angles, achieving precise phase control through parameter adaptation rather than through excitation signal generation.
3Measurement precision
If short sampling periods are used to limit sampling to specific phase angles, then phase angle control is achieved, but processing time and memory utilization increase
Solution Approach 1:
The patent performs preliminary action by measuring and storing the phase angle information of the sinusoidal signal before using it to determine sampling timing. This advance measurement allows the controller to calculate appropriate sampling intervals in advance, avoiding the need for rapid processing during the sampling instant and reducing real-time computational burden.
Data Source
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AI summary
A method for synchronizing input sampling to desired phase angles of sinusoidal signals including determining a delay time period for converging a next sample point to a next desired phase angle based on a phase error value.