Reverse Signal Processing for Short PLL Synchronization Windows
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Solution Overview
Problem
Phase-locked loops (PLLs) require a locking time to synchronize with input signals, leading to the discard of initial signal samples and inability to analyze short signal portions, as the locking time can exceed the signal duration.
Innovation Solution
A signal processing method that processes the input signal twice: first from a start point to a preliminary stop point and then backwards from the preliminary stop point to the start point, using adapted processing parameters to generate output parameters and synchronize the output signal, allowing for the utilization of the entire input signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the PLL processes the input signal from start point to preliminary stop point to adapt processing parameters, then the processing parameters are adapted to the input signal, but the initial signal samples before locking must be discarded and cannot be used for analysis
Solution Approach 1:
The patent applies inversion by processing the signal in reverse direction. After the PLL adapts processing parameters by forwarding processing from start point to preliminary stop point, the same signal portion is processed again in reverse from preliminary stop point back to start point. This allows initial signal samples that would normally be discarded to be utilized for parameter generation, converting information loss into useful data while maintaining parameter adaptation accuracy.
2Measurement precision
If the PLL locking time is longer than the input signal duration, then the PLL can achieve accurate parameter adaptation, but the input signal cannot be analyzed because the PLL does not lock in time
Solution Approach 1:
The patent applies preliminary action by performing forward processing first to adapt the processing parameters before performing the critical reverse processing. The PLL performs preliminary parameter adaptation by processing the signal from start point to preliminary stop point, then uses these adapted parameters for the reverse processing from preliminary stop point to start point. This allows the system to utilize the entire signal duration effectively, enabling analysis even when the conventional locking time would exceed the signal duration.
3Reliability
If the PLL discards initial signal samples acquired before locking, then the processed parameters are reliable, but memory capacity is wasted and accuracy is reduced due to fewer usable samples
Solution Approach 1:
The patent applies discarding and recovering by initially discarding the forward-processed signal portion (which is used only for parameter adaptation) and then recovering the utility of the initial signal samples through reverse processing. The signal portion from start point to preliminary stop point is processed forward for parameter adaptation, then the same portion is processed in reverse to generate useful output parameters. This recovers what would have been discarded samples, increasing the quantity of usable signal samples while maintaining reliability through the two-stage processing approach.
Data Source
AI summary
A signal processing method is described. The signal processing method comprises the following steps: An input signal is received. The input signal is processed from a start point to a preliminary stop point based on at least one first processing parameter, thereby obtaining a first processed signal. The at least one first processing parameter is adapted based on the first processed signal, thereby obtaining at least one second processing parameter. The input signal is processed from the preliminary stop point to the start point based on the at least one second processing parameter, thereby obtaining a second processed signal. At least one output parameter is generated and/or an output signal is synchronized with the input signal based on the second processed signal. Further, a signal analysis module is described.