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. 09, 1992
Filed:
Sep. 08, 1989
Applicant:
Inventor:
Isamu Takano, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375110 ; 328 16 ; 328 30 ;
Abstract
A method and circuit for extracting a timing clock in a Pulse Code Modulation (PCM) system capable of transmitting data at a rate which is on the order of a gigabit per second. A first clock signal is produced by extracting a fundamental frequency component from the received signal. A frequency-divided clock signal is produced by dividing the first clock signal by a predetermined division ratio. A second clock signal is produced by extracting a frequency component of the frequency-divided clock signal. The extracted clock signal is generated by multiplying the second clock signal by a ratio which corresponds to the division ratio.