Title:
METHOD AND DEVICE FOR ADJUSTING KEYING RATIO OF AT LEAST ONEELECTRIC SIGNAL
Document Type and Number:
Japanese Patent JPS6296816
Kind Code:
A
Abstract:
A process and apparatus for use in digital length or angle measuring systems for regulating the keying ratio of at least one periodic electrical signal. A signal is produced, proportional to the desired keying ratio, and compared with the periodic electrical signal. A momentary difference signal is generated from the comparison. If the frequency of the periodic electrical signal is within a selectable frequency range, the momentary difference signal is applied to a correction circuit, which is circuited parallel to a storage unit. The correction circuit supplies a correction signal, based on the momentary difference signal, to a sum amplifier. The sum amplifier is operative to superpose the correction signal on the periodic electrical signal, thereby regulating the keying ratio of the periodic electrical signal. The storage unit is operative to store a signal proportional to the difference signal. If the frequency of the periodic electrical signal is outside the selectable frequency, the correction signal is derived from the contents of the storage unit.
Inventors:
UARUTERU SHIYUMITSUTO
Application Number:
JP8844386A
Publication Date:
May 06, 1987
Filing Date:
April 18, 1986
Export Citation:
Assignee:
HEIDENHAIN GMBH DR JOHANNES
International Classes:
G01B7/00; G01D5/245; H03K5/04; H03K5/08; H03K5/156; (IPC1-7): G01B7/00; G01D5/245
Domestic Patent References:
| JPS56125612A | 1981-10-02 |
Attorney, Agent or Firm:
Ezaki Mitsuyoshi