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:
Dec. 03, 1996
Filed:
Sep. 09, 1994
Jean-Paul Etienne, St Quay-Perros, FR;
Jean-Louis Jeandot, Limours, FR;
Alcatel CIT, Paris, FR;
Abstract
A device for filtering positive dejustification jitter of a digital bit stream includes a phase-locked loop for slaving the timing of a signal representative of the read timing of a buffer memory into which the dejustified digital bit stream is written to the timing of a signal representative of the write timing of the buffer memory. The device applies low-pass filtering and determines the actual justification rate of the digital bit stream and deduces therefrom the difference justification rate, i.e. the difference between the actual rate and a nominal justification rate of the digital bit stream. It systematically eliminates phase shifts due to positive dejustification from the signal representative of the buffer memory write timing, regenerates phase shifts of the signal in numbers corresponding to the nominal justification rate, and regenerates phase shifts of the signal in numbers corresponding to the difference justification rate and smooths the phase shifts.