Method of synchronizing signals and a device herefor

Details Method of synchronizing signals and a device herefor Method of synchronizing signals and a device herefor

1997-03-26

1999-11-16

Pham, Chi H.

Pulse or digital communications

Synchronizers

375363, 341173, 377 33, H04L 700

Patent

active

059870800

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a method of establishing in a signal receiving unit a clearly defined digital value of a significant bit position, and on the basis hereof identifying the synchronization of received bit positions and generating therefrom synchronized transferred data packets or data cells occurring as received information-carrying signals, wherein the signal receiving unit is included in a separate signal transfer system.
The invention is based on the occurrence of a bit position that has the logic value "0" or the logic value "1" at each time section or time position. Accordingly, reference is made in the following description solely to "bit position".
A signal transfer system in which the present invention can be applied will include a transmission unit which transmits information-carrying signals that are digitalized through the medium of the values of said bit positions, a signal transfer medium, and a signal receiving unit which receives the information-carrying digitalized signals.
The signal transmission unit is adapted in a known manner to transmit digital information coordinated to form a data packet, and to transmit data packet on data packet or data cell on data cell in an ATM-system with a predetermined number of bit positions in each data packet.
In the following description only "data packet" is referred to.
The following description distinguishes between two categories of "data packet", where a first category of data packet is considered to be a "standardized" data packet and includes a predetermined number of standardized bit positions coordinated to form a number of bytes (data word) and containing address information and/or information-carrying data.
When reference is made in tie following description to "information-carrying" bit positions, these may be address-related or information-carrying.
The present invention is intended more particularly for use in signal transfer systems of the kind which use significant line codes, and even more particularly to systems of the kind in which the line codes are comprised of one bit position (or more bit positions) where the bit positions have one and the same digital value, for instance a logic "0", and occur periodically at time intervals of equal lengths, or a number of bit positions between line-code related bit positions.
More specifically, the system is also based on the assumption that the significant properties of a line code lie in a bit shift which occurs periodically with a predetermined number of information-carrying bit positions therebetween.
This bit shift can be achieved by allocating two bit positions to the line code, i.e. the value "0" and an adjacent value "1", or by assigning solely one bit position to the line code, e.g. the value "0", although in this latter case the system will require a transmitter-related scrambling unit and a receiver-related descrambling unit. (Systematic bit distortion and regeneration).
A data packet thus supplemented with line-code related bit positions forms the second category and is referred to as "a line-code supplemented" data packet.
Although the line code can seize two or more bit positions the following description is based on the assumption that the line code exists as a single bit position, and although the line code can assume one of two digital values, the following description is based on the assumption that the bit position has been allocated the digital value "0".
It is known by the person skilled in this art that the digital value of a bit position can be given the same information content, irrespective of whether the value is "0" or "1", meaning that in the following description of the features of the invention each reference to a digital value "0" can be replaced with the value "1", and vice versa.
In a signal transfer system of the aforesaid kind, the signal receiving unit is adapted to receive digital information which is coordinated to form a data packet and which includes line-code related bit positions.
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REFERENCES:
patent: 4542498 (1985-09-01), Bordros
patent: 4819231 (1989-04-01), Yamada
patent: 5177482 (1993-01-01), Cideciyan
patent: 5410754 (1995-04-01), Klotzbach
patent: 5467347 (1995-11-01), Petersen

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