Device for filtering odd-numbered harmonic signal components

Details Device for filtering odd-numbered harmonic signal components Device for filtering odd-numbered harmonic signal components

1997-07-15

1999-02-23

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

058747290

ABSTRACT:
A device that is suitable for filtering odd-numbered harmonic signal components out of a periodic signal which is generated from the scanning of a periodic scale graduation using the scanning plate. The scanning plate includes a periodic sequence of individual filter elements in the measuring direction for the resulting periodicity P of the filter elements, the condition P=N.cndot.d.sub.A applies, and N is an odd-numbered integer greater than 1, and d.sub.A is a period of a scanning graduation of a scanning plate without filtering action. In the filter elements, there is a symmetrical arrangement of structural elements such that inside each filter element two complementary halves of structural elements are each provided.

REFERENCES:
patent: 4602436 (1986-07-01), Ernst
patent: 5583798 (1996-12-01), Franz et al.
patent: 5604345 (1997-02-01), Matsuura
patent: 5726445 (1998-03-01), Thaler et al.

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