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:
Sep. 19, 1995
Filed:
Dec. 28, 1993
Young W Kim, Daejeon, KR;
Byung G No, Daejeon, KR;
Chang H Jung, Daejeon, KR;
Jae W Yoon, Daejeon, KR;
Kyo I Chung, Daejeon, KR;
Kwang H Park, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
A method for detecting a fine frequency deviation generated in a transmission line such as a general public telephone switching network. The method includes the steps of transmitting test signals to a transmission channel to be tested, receiving the test signals from the transmission channel, detecting a basic period from the received test signals, and determining a measure period on the basis of the detected basic period, performing a normalization by use of the basic period determined, extracting values of signals to be calculated, namely, object signals from those of the basic and measure periods, calculating respective absolute values of the object signals, averaging the calculated absolute values, and thereby calculating an absolute value of frequency deviation and determining a sign or direction of the frequency deviation, and determining a final frequency deviation on the basis of the sign determined from the absolute value of frequency deviation.