Brinks Hofer Gilson & Lione
Device for filtering odd-numbered harmonic signal components
 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. 
Johannes Heidenhain GmbH
G
G01D
inventional
Wolfgang
Holzapfel