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. 13, 1978
Filed:
Sep. 01, 1977
Donald Lars Duttweiler, Colts Neck, NJ (US);
Allan Michael Hofmann, Jackson, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
In a digital communication system, synchronization of a plurality of asynchronous digital signals is usually achieved by stuffing one or more pulses in a pulse stream. Thereby, stuffing equalizes the input signal bit rate with the usually fixed bit rate of a signal on a transmission link. For example, in pulse stuffing, single pulses are added at certain allowed times to equalize the input bit rate with the transmission link bit rate. On the other hand, in block stuffing, a block of pulses is added. However, conventional block stuffing usually requires a narrowband phase-locked loop for removing jitter in the received signal. As a result, slower acquisition of synchronization occurs. To mitigate this and other problems in a block oriented system, an improved arrangement, called quasi-pulse stuffing synchronization, employs block stuffing at a transmitter and pulse destuffing at a receiver in combination with a control signal for identifying when a digital signal would have been pulse stuffed if the system were employing pulse stuffing. Thereby, jitter can be removed using a conventional widerband, pulse stuffing phase-locked loop.