Sensor Signal Correction Using Frequency Response Compensation
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Solution Overview
Problem
Existing sensor signal generation techniques face limitations in achieving high accuracy due to errors in analysis results when using distortion information directly, particularly in swing analysis devices attached to golf clubs.
Innovation Solution
A sensor signal generation device that includes a voltage signal generation circuit and a correction unit, which performs Fourier transform, correction using complex frequency characteristics, and inverse Fourier transform to generate accurate sensor signals, effectively addressing the limitations by reflecting the charge output from the sensor element with high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distortion information from the sensor is used directly without correction, then the device complexity is reduced, but the measurement precision of the analysis result deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the frequency characteristics of the voltage signal generation circuit before actual measurement. The correction table is prepared in advance based on the known frequency response of the circuit, allowing real-time correction to be performed simply by table lookup without complex real-time calculations, thus improving measurement precision while keeping device complexity manageable
Solution Approach 2:
The patent introduces an intermediary correction table that mediates between the raw sensor output and the final analysis result. This correction table acts as a lookup intermediary that translates uncorrected distortion information into corrected values based on pre-computed frequency characteristics, achieving high precision without requiring complex real-time processing circuitry
2Measurement precision
If frequency characteristics correction is applied to the voltage signal, then the measurement precision of the sensor signal is improved, but the device complexity increases due to additional correction circuitry
Solution Approach 1:
The frequency characteristics correction is performed in advance during device manufacturing or initialization. The correction table is pre-computed based on the voltage signal generation circuit's frequency response characteristics and stored in memory. During actual operation, only simple table lookup and interpolation are needed, avoiding complex real-time correction calculations and reducing the complexity of the correction circuit
Solution Approach 2:
The system performs self-characterization by automatically measuring its own frequency response characteristics during initialization and using these characteristics to generate the correction table. This self-service approach eliminates the need for external calibration equipment or complex manual setup, reducing device complexity while achieving high measurement precision
Data Source
AI summary
A sensor signal generation device includes a charge amplifier and a voltage amplifier circuit that convert a physical quantity of an observation target outputted from a sensor element into a voltage signal and output the voltage signal, and a correction unit that outputs a sensor signal obtained by correcting the voltage signal using frequency characteristics of the charge amplifier and the voltage amplifier circuit.