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:
Jun. 24, 2014
Filed:
Dec. 17, 2010
Applicant:
Akira Nara, Tokyo, JP;
Inventor:
Akira Nara, Tokyo, JP;
Assignee:
Tektronix International Sales GmbH, Rheinfall, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D 3/00 (2006.01); H04L 27/38 (2006.01); G01R 13/02 (2006.01); G01R 23/16 (2006.01);
U.S. Cl.
CPC ...
H04L 27/3845 (2013.01); G01R 13/0254 (2013.01); G01R 23/16 (2013.01);
Abstract
A modulation error is detected every symbol data to generate a trigger signal. The present invention focuses that there are limited patterns of shifts from one symbol data to the next one of the digital modulation signal. Measured values of amplitude, phase and/or frequency of symbol data are latched and then values at the next symbol timing are predicted from the latched measured values using said feature. The predicted and measured values are compared at the following symbol timing. If the difference (error) is over an acceptable range, a trigger signal is provided which allows acquiring a modulation error by symbol data.