Coded data generation or conversion – Digital pattern reading type converter – Real and complementary patterns
Patent
1995-01-27
1997-10-14
Williams, Howard L.
Coded data generation or conversion
Digital pattern reading type converter
Real and complementary patterns
341115, H03M 100
Patent
active
056776861
ABSTRACT:
An absolute position detection apparatus which comprises sine and cosine wave generators for generating one or more sets of sine and cosine waves within a cycle, analog-to-digital converters for converting the incoming sine and cosine waves generated by the sine and cosine wave generators into digital values. An arithmetic unit is used for calculating a compensation for errors including offset, amplitude and phase errors on the basis of the digital values from the analog-to-digital converters. In the apparatus, the arithmetic unit operates on a phase angle from phase angles found by the arithmetic performed prior to or during said error compensations and the digital values from the analog-to-digital converters, whereby a low-priced, highly reliable absolute position detection apparatus can be achieved without the addition of compensation circuits to the hardware.
REFERENCES:
patent: 4318617 (1982-03-01), Orsen
patent: 5155696 (1992-10-01), Shibata et al.
patent: 5239490 (1993-08-01), Masaki et al.
patent: 5463393 (1995-10-01), Havlicsek
Aoki Yukio
Kachi Mitsuyasu
Kazama Tsutomu
Mizutani Takao
Sakuma Hirokazu
Mitsubishi Denki & Kabushiki Kaisha
Williams Howard L.
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