A signal processing apparatus (400;800) comprising: a demodulator (e.g. a PSK demodulator) (407;900) arranged to demodulate a received signal, which carries consecutive symbols (a.sub.1, . . . , a.sub.4) at a symbol rate, wherein the demodulator (407;900) is arranged, based on sample values of the received signal, to calculate an error value (.phi..sub.m) of a given symbol relative to a decision-directed determination of an expected symbol value (I); and a phase-shifter (406,409;801;1002,1013) a...

A method of transmitting a synchronisation signal during a synchronisation time slot of a system for time division-duplex (TDD) telecommunication by mobile stations where the data is transmitted in frames consisting of time slots. The method includes transmitting the synchronisation sequence with a delay with respect to the start of a synchronisation time slot.

Fault-tolerant synchronization of real-time equipment connected to a computer network of several tens of meters with an option of including or not including such equipment in the synchronization device is disclosed. Global scheduling of the real-time computer platform in the form of minor and major cycles is provided in order to reduce latency during sensor acquisition. The associated calculation and preparation of output to the actuator is provided in an integrated modular avionic (IMA) archite...

A method, communication system and communication unit for synchronisation for multi-rate communication by transmitting a signal (FIG. 4A) having a synchronisation portion at a first, predetermined chip rate and containing an indication of chip rate used for a further portion; receiving the transmitted signal, recovering the indication from the synchronisation portion at the first, predetermined chip rate, and recovering information in the further portion at the chip rate indicated by the indicat...

A method for deriving a synchronisation signal (35) from a video signal comprises tracking the blanking level (107) of the video signal with first and second slice level signals (26, 27) and tracking the sync tip level (110) of the horizontal sync signal (109) of the video signal with third and fourth slice level signals (28,29) for determining the blanking level (107) and the sync tip level (110). A value for an intermediate slice level signal (30) is computed from the first, second, third and ...

The invention relates to a method and a device for synchronizing one or more remote clocks (2) to a central clock (1) via a bi-directional satellite radio link (9.1, 9.2). Time and data signals are exchanged via suitable transmitting (8, 12) and receiving devices (5, 11) at both ends of the radio link. From time difference measurements (6, 14) at both ends a control signal (17) is derived in such a manner that the clock (2) installed directly in the remote ground station devices (11) synchronize...

An encoder and method for efficient synchronization channel encoding in UTRA TDD mode by: producing a codeword a, where a=dG+z modulo-2, where d represents a predetermined code group to be encoded, G represents a predetermined generator matrix, and z represents a function of the code group number and a row of the generator matrix; producing values s.sub.k=2a.sub.2k+1+a.sub.k;k=0, 1, 2, 3, and associated values b.sub.0,b.sub.1,b.sub.2; and producing a value S.sub.ssc associated with the code grou...

A switchable transmission system operating by time-sharing for data carrying digital information, comprises a distant exchange and a local exchange, whereof the timers are not strictly synchronous, and means of correcting the relative drift of these timers. The system employs means for correcting the repetitions or omissions of synchronization words. Means are incorporated in the distant exchange for the transmission of blank words on each transmission line between data-carrying words. The local...

An arrangement of non-machined sheet metal synchronizer rings (1, 6, 10, 18, 19, 21) is provided, the outer synchronizer rings (1, 6, 10, 19) of which are provided a radial, outwardly projecting gear ring and a radial, outwardly directed flange (3).

A method for time synchronization of a number of measuring computers cooperating over a telecommunications network includes providing a number of time sources associated with one of the measuring computers. Each of the time sources has a different accuracy and can provide a time stamp. Using the first measuring computer, one of the time sources is selected as a function of the accuracy of the time source.