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Details
Inventors: Hespelt, Volker; Alberty, Thomas;
Assignee: ANT Nachrichtentechnik GmbH (Backnang, DE)
Primary Examiner: Safourek; Benedict V.
Assistant Examiner: Bocure; Tesfaldet
Attorney, Agent or Firm: Spencer, Frank & Schneider

A method of synchronizing clock pulses of a clock pulse generator used in a receiver of digital data transmissions. The received signal is demodulated by multiplying it in quadrature by an output signal of a carrier oscillator to obtain demodulated in-phase and quadrature components. The demodulated components are lowpass filtered to suppress harmonics of the carrier frequency and then bandpass filtered into two complex signals. The two complex signals are then linked together with a first linkage circuit to form a first control signal u.sub.TI. The two complex signals are also linked together with a second linkage circuit to form a second control u.sub.TR, wherein the two control signals can be interpretated as the real and imaginary components of a complex control signal u.sub.T =u.sub.TR +ju.sub.TI. The two components are separately averaged and then evaluated to form an actuation signal having an actuation value .delta. representing an error in the timing of the error pulse generator relative to the received signal. The evaluation is based on the relationship .phi.=arc tan u.sub.TI /u.sub.TR, where .phi. is the phase error in the clock pulse relative to the received signal.

DETAILED DESCRIPTION It is the object of the present invention to provide a method of the above-mentioned type which is able to substantially suppress the above-described getting-caught and permits much faster synchronization.
The solution is effected as follows: By means of a second linkage circuit in the timing error detector, the two complex signals from the bandpass filters are linked together to form a second control signal u.
sub.
TR in such a manner that the two control signals u.
sub.
TR and u.
sub.
TI can be interpreted as the real component and the imaginary component of a complex control value u.
sub.
T =u.
sub.
TR +ju.
sub.
TI.
The two control signals u.
sub.
TR and u.
sub.
TI are subjected to averaging.
Thereafter, the thus averaged values u.
sub.
TR and u.
sub.
TI are evaluated by means of an evaluation circuit to form an actuation value .
delta.
which actuates the timing error correction circuit.
The method according to the invention has the advantage that the above-described getting-caught is substantially suppressed and thus synchronization can take place much faster.
The additional costs for this are relatively low.



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