COORDINATE DETECTOR

PURPOSE:To eliminate the use of a filter by giving Fourier transform to the output of a magnetic field detector to obtain two Fourier coefficients and using these coefficients as the n-th higher harmonic wave components to read the position on a flat plate. CONSTITUTION:An output signal Vi of a dete...

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Bibliographic Details
Main Authors HOSHINO KEISUKE, IWAKI HIROSHI, TSUKUI TOSHIO
Format Patent
LanguageEnglish
Published 13.11.1984
Subjects
CALCULATING
COMPUTING
COUNTING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:PURPOSE:To eliminate the use of a filter by giving Fourier transform to the output of a magnetic field detector to obtain two Fourier coefficients and using these coefficients as the n-th higher harmonic wave components to read the position on a flat plate. CONSTITUTION:An output signal Vi of a detected winding is amplified by an amplifier 14 with the n-1 and the n order higher harmonic components extracted by a filter and then sampled into N units of data SK by an A/D converter 15. The data SK undergoes the discrete Fourier transform through a Fourier transform circuit 16 to obtain Fourier coefficients an and bn of the n order higher harmonic wave component. Then a phase phin is obtained from those Fourier coefficients. A subtractor circuit 18 performs a subtraction (phin-phin-1) to obtain a phase phi1. The phase phi1 is 0, 1, 2-n-1 are delivered in accordance with the size of the phase. These values are multiplied by 2pi through a multiplying circuit 20 and then addd with the phase phin by an adder circuit 21 to obtain the coordinate.
Bibliography:Application Number: JP19830073203