Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
1997-06-24
2001-06-26
Marcelo, Melvin (Department: 2663)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
Reexamination Certificate
active
06252890
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to an apparatus for transmitting digital signals between a higher-ranking station and one or more subordinate stations.
The signal transit times in different transmission devices are not constant. For example, where the transmission devices are wireline connections, the signal transit times are very highly dependent on the length of the transmission line. When various pieces of equipment with different lengths of transmission lines are used simultaneously, it is necessary to compensate for the different line transit times of each system. Those problems arise particularly in applications using radio-in-the-loop (RITL) and in systems with cordless telephone sets on the DECT standard. Transit time differences have been compensated for heretofore by discrete solutions.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide an apparatus for compensating for signal transit time differences of digital transmission devices, which overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and in which compensation for signal transit time differences in a digital transmission device disposed between a higher-ranking station and subordinate stations can be ascertained at any time and automatically from individual signal transit times of respective transmission devices.
With the foregoing and other objects in view there is provided, in accordance with the invention, a n apparatus for transmitting digital signals between higher-ranking and subordinate stations, comprising a higher-ranking station; at least one subordinate station; and transmission devices between the higher-ranking station and each of the at least one subordinate station; each of the at least one subordinate station including a transmitting and receiving device, and a computing device having a synchronizing device and a compensating device, the synchronizing device automatically synchronizing data transmission in each of the at least one subordinate station and having a memory, the compensating device automatically calculating signal transit time differences from a difference between an assumed maximum signal transit time and respective actual signal transit times in the various transmission devices and automatically inserting a delay, corresponding to the signal transit time difference, into the memory of the synchronizing device, and the transmitting device automatically delaying the signals transmitted on an output side by the delay stored in memory; and the higher-ranking station including a transmitting and receiving device, and devices for automatically measuring signal transit times in the transmission devices.
In accordance with a concomitant feature of the invention, the devices for automatically measuring the signal transit times, the devices for automatically synchronizing the data transmission, and the devices for automatically compensating for the signal transit time differences are coupled for interference-free transmission of signals between the at least one subordinate station and mobile parts.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in an apparatus for compensating for signal transit time differences of digital transmission devices, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
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Alger-Meunier Michael
Ammar Yousif
Brueckmann Dieter
Hoefer Gerald
Greenberg Laurence A.
Kwoh Jasper
Lerner Herbert L.
Marcelo Melvin
Siemens Aktiengesellschaft
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