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. 18, 1996
Filed:
Jun. 21, 1995
Keiji Negi, Tokyo, JP;
Ando Electric Co., Ltd., Tokyo, JP;
Abstract
A testing device is provided to test performance of transmission systems such as communication devices and transmission lines by transmitting and receiving specific patterns called pseudo-random patterns (i.e., PN patterns). A receiver unit of the testing device provides a synchronization detecting circuit. The synchronization detecting circuit comprises a pseudo-random-pattern creating circuit, a first coincidence detecting block, a second coincidence detecting block and an OR circuit. The first coincidence detecting block detects coincidence between a receiving-data input, a first detected-pattern input and a pseudo-random pattern created by the pseudo-random-pattern creating circuit so as to produce a first coincidence detecting signal. The second coincidence detecting block detects coincidence between the receiving-data input, a second detected-pattern input and the pseudo-random pattern so as to produce a second coincidence detecting signal. The first and second coincidence detecting signals are applied to the OR circuit, by which a synchronous detection signal is produced. Thus, synchronization between the receiving-data input and pseudo-random pattern is detected by the synchronous detection signal. Incidentally, each of the first and second detected-pattern inputs receives the pseudo-random pattern transmitted thereto through the transmission system; and the second detected-pattern input is delayed behind the first detected-pattern input by `m` bits (where `m` is an integer which is determined in advance).