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An analog data processor for chart records using a multielement photodetector.

S Minami, S Tsutsui, H Onoda

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    A novel analog processor computes convolution integrals from graphical data using an optical scanner and photodiode array. This accurate system, with over 0.5% precision, can also function as a generator or simulator.

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    Area of Science:

    • Engineering
    • Signal Processing
    • Spectroscopy

    Background:

    • Convolution integrals are crucial in signal processing and data analysis.
    • Existing methods for computing these integrals can be complex or computationally intensive.
    • Graphical data, such as recorder traces, often requires specialized processing.

    Purpose of the Study:

    • To describe a novel analog apparatus for computing convolution integrals.
    • To demonstrate the apparatus's capability in processing graphical data from recorder traces.
    • To highlight the system's accuracy and potential applications.

    Main Methods:

    • Utilizing an optical scanner with a multielement photodiode array to read recorder traces.
    • Employing analog circuits to process signals and compute weighted moving averages.
    • Testing the apparatus with spectroscopic data from infrared spectrophotometers.

    Main Results:

    • The apparatus accurately computes convolution integrals from graphical data.
    • The system achieves an overall accuracy better than 0.5%, accounting for electronic drift.
    • Demonstrated performance with infrared spectroscopic data.

    Conclusions:

    • The developed analog processor offers an efficient method for computing convolution integrals.
    • The system exhibits high accuracy and reliability.
    • The apparatus has versatile applications, including function generation and instrument simulation.