The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 1990
Filed:
May. 26, 1989
Wolfram Ernst, Munich, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
Process for synchronization of a frequency to an interference-prone reference frequency. Loss of the steady-state phase relationship between frequency and reference frequency which is maintained during the control process because of either phase shifts or necessary switching to another reference frequency causes a permanent phase deviation (random walk) in some cases because of the interference-prone reference frequencies until the steady-state phase relationship is restored. In order to prevent random walk or to avoid having to terminate the phase relationship, initially an offset value is generated by the microprocessor upon occurrence of a phase shift which exceeds a predetermined threshold and prevents the effect of the phase shift on the control process, and secondly, each reference frequency is assigned its own phase discriminator by means of which the trend in the phase relationship of the frequency in comparison with each reference frequency is known by the microprocessor, so that the microprocessor can take suitable control measures in the event it is necessary to switch to a different reference frequency.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile