Encoder output pulse detection using two stage shift register an

Details Encoder output pulse detection using two stage shift register an Encoder output pulse detection using two stage shift register an

1981-05-19

1984-04-10

Thomas, James D.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Counting on an object, areas having alternating physical...

340347P, 377 54, 377 64, 377 73, 377 81, 328109, 328133, 324 83R, 307515, H03K 1302, G01G 300, G01R 1914

Patent

active

044425325

ABSTRACT:
A pulse detection circuit, is used for detecting pulses contained in output signals derived from an encoder. An encoder, such as rotary encoder, converts a physical quantity like spatial position, displacement or length into an electric signal. This detection circuit achieves high definition in terms of the rotational angle of the encoder shaft. It does so by positively utilizing four different combinations of modes, obtained for one period of the encoder output signals, which had hitherto been treated in one count. It thereby avoids erroneous counting of the pulses contained in the encoder output signals, even if chatterings are incidentally included in the encoder output signals and if the phase relation between the two signals is temporarily inverted. The circuit thus performs pulse detection with a very high accuracy.

REFERENCES:
patent: 4041483 (1977-08-01), Groff
patent: 4047007 (1977-09-01), Dlugos et al.
patent: 4157507 (1979-06-01), Desai et al.
patent: 4245322 (1981-01-01), Batchelor
patent: 4266215 (1981-05-01), Adams
patent: 4308500 (1981-12-01), Avins

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