Device for filtering of harmonic signal components

Details Device for filtering of harmonic signal components Device for filtering of harmonic signal components

Filed on

1996-08-28

Date issued

1998-09-29

Examiner

Le, Que

Patent Class

Radiant energy

SubClass

Photocells; circuits and apparatus

SubSubClass

Optical or pre-photocell system

Other Related Categories

25023114, 256373, G01D 534

Type

Patent

Status

active

Patent number

058148124

Description

ABSTRACT:
In a device for filtering harmonic signal components which are created during the scanning of a scale graduation by means of at least one scanning graduation, the graduation marking of the scale or the scanning graduation have a definite shift with respect to equidistant spacing intervals. The shift is chosen such that the signal components of the n-th even harmonic are eliminated by virtue of the resulting phase shift while at the same time the phase position for the signal components of the fundamental wave remains constant and thus independent of the scanning site. In particular, the depth of modulation of the fundamental wave is not reduced.

REFERENCES:
patent: 4602436 (1986-07-01), Ernst
patent: 4776701 (1988-10-01), Pettigrew
patent: 5182613 (1993-01-01), Ieki et al.
patent: 5332896 (1994-07-01), Holzapfel
patent: 5583798 (1996-12-01), Franz et al.

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