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:
Jul. 18, 1989
Filed:
Jul. 25, 1986
Hiroshi Takeo, Kawasaki, JP;
Masanori Kajiwara, Tokyo, JP;
Michinobu Ohhata, Yokohama, JP;
Takao Moriya, Hachioji, JP;
Satoshi Takeda, Komae, JP;
Hiroshi Nakaide, Kawasaki, JP;
Hiroshi Yamasaki, Kawasaki, JP;
Toshinari Kunieda, Nagoya, JP;
Ikuo Washiyama, Kanazawa, JP;
Fujitsu Limited, Kawasaki, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A digital signal transmission system includes a synchronization pattern detection circuit for detecting a synchronization pattern in response to a received transmitted digital signal, a pseudo synchronization detection circuit for detecting a pseudo synchronization pattern in the form of cyclic redundancy code in response to a received transmitted digital signal, and a synchronization protection circuit for counting the synchronization pattern detection signals produced when synchronization patterns are detected in response to a synchronization pattern detection signal from the synchronization pattern detection circuit. The synchronization protection circuit includes a main synchronization counter circuit and an auxiliary synchronization counter circuit. The count of protection steps for the confirmation of synchronization recovery of the auxiliary synchronization counter circuit in accordance with synchronization or asynchronization of the main synchronization counter circuit is variable.