Detector Feedback Calibration for Digital Filter Transfer Matching
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Solution Overview
Problem
Existing technologies face challenges in deriving a transfer function of a signal processing device in a time-efficient manner for programming a digital filter to replicate the transfer function.
Innovation Solution
An apparatus comprising a detector with a signal modification block, comparison block, decimation block, and feedback loop is used to determine the transfer function, utilizing phase and amplitude comparators to generate calibration information for programming a digital filter, with optional interpolation for frequency domain samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional methods are used to derive the transfer function, then the digital filter can be programmed to replicate the transfer function, but the process is time-consuming and inefficient
Solution Approach 1:
The patent implements a feedback loop where the detector compares the output of the signal processing device with a reference signal, generates error signals, and feeds them back to adjust the digital filter coefficients. This closed-loop feedback mechanism accelerates the convergence to the optimal transfer function replication, significantly reducing calibration time compared to open-loop traditional methods.
Solution Approach 2:
The patent introduces a detector as an intermediary component that mediates between the signal processing device and the digital filter. The detector extracts transfer function characteristics by comparing signals and generates calibration information that programs the digital filter, enabling efficient derivation without direct complex calculations between the signal processing device and filter.
2Measurement precision
If the digital filter is programmed to accurately replicate the transfer function, then calibration accuracy is improved, but the complexity of the apparatus increases
Solution Approach 1:
The patent segments the calibration function into distinct modular components: a detector module for signal comparison and transfer function extraction, a signal modification block for signal conditioning, and a digital filter programming module. This segmentation allows each component to perform its specific function efficiently, improving calibration accuracy while managing overall system complexity through modular design.
Solution Approach 2:
The detector is designed as a multi-functional component that performs multiple tasks: it compares signals, extracts amplitude and phase information, determines transfer function characteristics, and generates calibration information. This universality reduces the need for separate dedicated components for each function, thereby improving calibration accuracy without proportionally increasing apparatus complexity.
Data Source
AI summary
An apparatus for calibrating a digital filter to replicate a transfer function of a signal processing device comprising a detector with a first input to receive a first signal; a second input to receive a response signal of the signal processing device to the first signal; a signal modification block; a comparison block and a decimation block; wherein the comparison-block compares a phase and amplitude of the first signal after a correction has been applied by the signal modification block and decimation has been applied by the decimation block; and a feedback loop; wherein detector is configured to determine at least a feedback control signal at a first frequency and a second frequency, different to the first frequency and determine calibration information for programming of the transfer function of said digital filter.